Review
18 October 2022
10.3389/fphar.2022.998965
TYPE
PUBLISHED
DOI
OPEN ACCESS
EDITED BY
Wei Peng,
Chengdu University of Traditional
Chinese Medicine, China
REVIEWED BY
Mahdi Moridi Farimani,
Shahid Beheshti University, Iran
Jun Yu Liu,
Chengdu University of Traditional
Chinese Medicine, China
*CORRESPONDENCE
Hongxun Tao,
thxshutcm@163.com
Zhiyong Chen,
chenzhiyong0612@sina.com
The genus Porana
(Convolvulaceae) - A
phytochemical and
pharmacological review
Yu Peng 1,2†, Ye Li 1†, Yuanyuan Yang 3, Yuanqing Gao 2, Hui Ren 1,
Jing Hu 1, Xiaomin Cui 1, Wenjing Lu 1, Hongxun Tao 4* and
Zhiyong Chen 1*
1
Shaanxi Academy of Traditional Chinese Medicine, Xi’an, Shaanxi, China, 2Jiangsu Provincial Key
Laboratory of Cardiovascular and Cerebrovascular Medicine, School of Pharmacy, Nanjing Medical
University, Nanjing, Jiangsu, China, 3Xi’an Institute for Food and Drug Control, Xi’an, Shaanxi, China,
4
School of Food and Biological Engineering, Jiangsu University, Zhenjiang, Jiangsu, China
†
These authors have contributed equally
to this work and share first authorship
SPECIALTY SECTION
This article was submitted
to Ethnopharmacology,
a section of the journal
Frontiers in Pharmacology
20 July 2022
10 October 2022
PUBLISHED 18 October 2022
RECEIVED
ACCEPTED
CITATION
Peng Y, Li Y, Yang Y, Gao Y, Ren H, Hu J,
Cui X, Lu W, Tao H and Chen Z (2022),
The genus Porana (Convolvulaceae) - A
phytochemical and
pharmacological review.
Front. Pharmacol. 13:998965.
doi: 10.3389/fphar.2022.998965
COPYRIGHT
© 2022 Peng, Li, Yang, Gao, Ren, Hu,
Cui, Lu, Tao and Chen. This is an openaccess article distributed under the
terms of the Creative Commons
Attribution License (CC BY). The use,
distribution or reproduction in other
forums is permitted, provided the
original author(s) and the copyright
owner(s) are credited and that the
original publication in this journal is
cited, in accordance with accepted
academic practice. No use, distribution
or reproduction is permitted which does
not comply with these terms.
There are about 20 species of Porana Burm. f. worldwide in tropical and
subtropical Asia, Africa and neighboring islands, Oceania, and the Americas.
In China, India, and other places, this genus enjoys a wealth of experience in folk
applications. Nevertheless, the chemical composition of only five species has
been reported, and 59 compounds have been isolated and identified, including
steroids, coumarins, flavonoids, quinic acid derivatives, and amides.
Pharmacological studies revealed that extracts from this genus and their
bioactive components exhibit anti-inflammatory, analgesic, antioxidant, antigout, anti-cancer, and anti-diabetic effects. Although this genus is abundant,
the development of its pharmacological applications remains limited. This
review will systematically summarize the traditional and current uses,
chemical compositions, and pharmacological activities of various Porana
species. Network analysis was introduced to compare and confirm its output
with current research progress to explore the potential targets and pathways of
chemical components in this genus. We hope to increase understanding of this
genus’s medicinal value and suggest directions for rational medicinal
development.
KEYWORDS
Porana burm. f., traditional use, phytochemistry, network analysis, pharmacological
activity
Abbreviations: Akt, protein kinase B; COX-2, cyclooxygenase-2; C-T-P, compound-target-pathway;
FGF-2, fibroblast growth factor 2; HIF, hypoxia inducible factor; HPLC, high performance liquid
chromatography; Ig, intragastric administration; IL-6, interleukin 6; iNOS, inducible nitric oxide
synthase; Ip, intraperitoneal injection; KEGG, Kyoto Encyclopedia of Genes and Genomes; LPS,
lipopolysaccharide; MAPK, mitogen-activated protein kinases; MDA, malonic dialdehyde; MSU,
monosodium urate; MyD88, myeloid differentiation factor 88; NF-κB, nuclear transcription factorκB; NO, nitric oxide; PGE2, prostaglandin E2; PI3K, phosphoinositide 3-kinase; PPI, protein-protein
interaction; SOD, superoxide dismutase; STAT, signal transducer and activator of transcription; TLR2,
toll-like receptor 2; TNF-α, tumor necrosis factor-α; VEGF, vascular endothelial growth factor.
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1 Introduction
Porana plants usually have only one spherical and glabrous
seed (Chen et al., 2004).
The medicinal records of Porana plants are extensive. Porana
paniculata Roxb. has been used in folk medicine to treat pain and
inflammation in Ayurveda and India (Kumar et al., 2015).
Porana sinensis Hemsl. is a direct substitute for commercial
Dingongteng medicinal materials and is known for its therapeutic
effect on rheumatoid arthritis and bruises (Ren et al., 2019).
According to the National Compendium of Chinese Herbal
Medicine, the whole plant of Porana racemosa Roxb. is used
to treat colds and indigestion (Guoqiang, 2014), while its stems
and roots are used to treat rheumatism (Liu and Li, 1997).
Research on the phytochemistry of Porana plants focuses on
Porana discifera C.K.Schneid., P. racemosa, P. sinensis, Porana
spectabilis Kurz, and Porana duclouxii Gagnep. & Courchet;
59 compounds have been isolated from Porana plants,
including 14 steroids, six coumarins, seven flavonoids, six
quinic acid derivatives, and three amides (Zhu et al., 2007; Li
et al., 2013; Ding et al., 2014; Chen et al., 2015; Xue et al., 2019).
Pharmacological studies revealed that the extracts of Porana
plants and their bioactive compounds treat arthritis (Dou et al.,
2013), gout (Chen et al., 2014; Du et al., 2020), inflammation (Wu
et al., 2016; Xue et al., 2019), and cancer (Huang et al., 2019).
There are more than 20 species of Porana Burm. f. worldwide
in tropical and subtropical Asia, Africa and neighboring islands,
Oceania, and the Americas. Fifteen species are displayed in
Table 1 (for more information, see http://www.
plantsoftheworldonline.org or www.theplantlist.org). The
global distribution of Porana plants based on the Global
Biodiversity Information Facility (https://www.gbif.org/) and
the herbarium diagrams of three mainstream species are
shown in Figure 1.
Porana plants are vines, woody, herbaceous, or climbing
shrubs. Their ovate leaves are mostly cordate at the base, with
petioles. The inflorescence morphology of Porana plants is
divided into racemes or panicles, with some single-flower
forms. Their bracts are leaflike, small and subulate, or
absent. Their corollas are neatly arranged, presenting white,
reddish, and some lavender. The ovaries are primarily
glabrous. Some are one-celled, containing two ovules, while
some are one-to two-celled, containing two to four ovules.
Their stigmas are spherical, each connecting to the ovary by
one style. Capsules of Porana plants are relatively small, subglobose to oblong, dehiscent in two petals, or not dehiscent.
TABLE 1 Synonyms and distribution of Porana species.
No.
Species
Synonyms
Distribution
1
Porana acuminata P.Beauv
Neuropeltis acuminata (P.Beauv.)
Benth
West Tropical Africa
2
Porana densiflora Hallier f
Metaporana densiflora (Hallier f.)
N.E.Br
Tanzania
3
Porana dinetoides C.K.Schneid
Dinetus dinetoides (C.K.Schneid.)
Staples
Assam, China South-Central, Myanmar
4
Porana discifera C.K.Schneid
Poranopsis discifera (C.K.Schneid.)
Staples
Assam, China South-Central, Laos, Myanmar, Thailand, Vietnam
5
Porana duclouxii Gagnep. &
Courchet
Dinetus duclouxii (Gagnep. &
Courchet) Staples
China South-Central
6
Porana grandiflora Wall
Dinetus grandiflorus (Wall.) Staples
East Himalaya, Nepal, Tibet
7
Porana henryi Verdc
Poranopsis sinensis (Hand.-Mazz.)
Staples
China South-Central
8
Porana mairei Gagnep
Dinetus decorus (W.W.Sm.) Staples
Assam, China South-Central, Myanmar
9
Porana paniculata Roxb
Poranopsis paniculata (Roxb.)
Roberty
Assam, Bangladesh, East Himalaya, India, Myanmar, Nepal, Pakistan, Tibet, West
Himalaya
10
Porana parvifolia (K.Afzel.) Verdc
Metaporana parvifolia (K.Afzel.)
Verdc
Madagascar
11
Porana racemosa Roxb
Dinetus racemosus (Roxb.) Sweet
Assam, Bangladesh, China North-Central, China South-Central, China Southeast,
East Himalaya, India, Jawa, Laos, Lesser Sunda Is., Myanmar, Nepal, Pakistan,
Sulawesi, Thailand, Vietnam, West Himalaya
12
Porana sinensis Hemsl
Tridynamia sinensis (Hemsl.) Staples
China North-Central, China South-Central, China Southeast, Vietnam
13
Porana spectabilis Kurz
Tridynamia spectabilis (kurz) Parmar
Andaman Is., Assam, Cambodia, China South-Central, China Southeast, Hainan,
Laos, Malaya, Myanmar, Thailand, Vietnam
14
Porana subrotundifolia De Wild
Paralepistemon shirensis (Oliv.)
Lejoly & Lisowski
Angola, KwaZulu-Natal, Malawi, Mozambique, Northern Provinces, Zambia, Zaïre,
Zimbabwe
15
Porana velutina (M.Martens &
Galeotti) Hallier f
Porana nutans (Choisy) O’Donell
Mexico Central, Mexico Southwest
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FIGURE 1
The global distribution of Porana Burm. f., and the plant specimens of P. sinensis, P. racemosa, and P. dinetoides.
“biological activity,” “substitute,” “toxicity,” and “quality
control.” The bibliographies of all selected articles were
scanned to seek additional relevant articles.
Although Porana has a wide range of medicinal uses, and its
extracts and bioactive compounds show excellent efficacy,
current research remains limited, complicating the
investigation of its chemical components, pharmacological
activities, quality control, and safety. Therefore, it is critical to
perform a systematic literature review on Porana to promote
rational medicinal development.
3 Traditional uses
The medicinal parts of P. sinensis are canes, which have been
used to substitute for the endangered traditional Chinese
medicine Dinggongteng (Erycibes caulis) in China (Xue et al.,
2017). Dinggongteng is a traditional Chinese folk medicine, first
recorded in the Supplement to Medica, which recorded the effect
of dispelling wind and strengthening the waist (Shang, 2004).
The National Collection of Chinese Herbal Medicine, the
Dictionary of Chinese Herbal Medicine, and the Chinese
Materia Medica have documented Dinggongteng, which dispels
wind and dampness, relaxes tendons, activates collaterals,
reduces swelling, and relieves pain. The traditional clinical
2 Methodology
An extensive search of studies was conducted from scientific
journals (original research, reviews, and short communications),
books, and reports from internationally recognized databases
(Web of Science, PubMed, ScienceDirect, China National
Knowledge Infrastructure, and Google Scholar). The following
keywords
were
selected:
“Porana,”
“pharmacology,”
“ethnopharmacology,”
“compound,”
“phytotherapy,”
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flavonoids, six quinic acid derivatives, three amides, and
23 other compounds. These compounds are displayed in
Table 2 according to their chemical name, chemical type,
and their original plants. The structural formulas of these
compounds are shown in Figure 2.
application of Dinggongteng has been to treat rheumatoid
arthritis, bruises, and other diseases, according to the
2020 edition of the Chinese Pharmacopoeia. With E. caulis as
the main medicinal material, and more than ten Chinese patent
medicines have been developed, including Feng Liaoxing
Rheumatism Dieda Liquor and Tengluoning Capsule (Fan
et al., 2021; Peng et al., 2021). Dinggongteng is often
combined with Cinnamomi ramulus, Ephedrae herba,
Angelicae sinensis radix, and other medicinal materials. Wu
et al. (2005) investigated the commercial medicinal materials
in Guangxi, the main production area for E. caulis, as well as
Shanghai, Jiangsu, Zhejiang, and other places, and found that the
wild resources of Erycibe obtusifolia Benth. and Erycibe schmidtii
Craib could no longer meet the demand for clinical medication.
P. sinensis has already become a mainstream substitute for E.
caulis on the market. The widespread application of P. sinensis
has promoted the sustainable utilization of the endangered
traditional Chinese medicine E. caulis while accumulating
evidence for the effectiveness and safety of P. sinensis.
P. racemosa is also a traditional folk medicine of the Dai,
Yi, and Tujia nationalities in China, and its whole herb is the
medicinal part (Fang et al., 2007). According to the National
Compendium of Chinese Herbal Medicine, the whole plant of
P. racemosa relieves the surface, eliminates food
accumulation, and is primarily used for colds and food
accumulation (Editorial Board, 1975). Its stem and root
treat rheumatism (Liu and Li, 1997). In the treatment of
cold and fever, it is often used in combination with
Peucedanum praeruptorum and Periliae fructus, while in
the treatment of food accumulation, it is often used in
combination with Crataegi fructus and Serissa serissoides
(Fang et al., 2007). In Guangxi Province, P. spectabilis is
used to treat uterine prolapse, with its whole herb as the
medicinal part (Li et al., 1985). P. spectabilis contains
scopoletin, ethyl caffeate, and other compounds (Zhu et al.,
2001); however, no pharmacodynamic study has been
reported. According to the Chinese Materia Medica, the
root of Porana mairei Gagnep. relieves cough and asthma
(Editorial Board, 2009).
In summary, Porana plants are used as folk medicines. The
genus has received increasing attention due to the widespread
use of P. sinensis as a substitute for E. caulis.
4.1 Steroids
Fourteen steroids have been isolated from Porana
species, of which 12 were isolated from P. discifera,
including compounds 1–10 (Zhu et al., 2000) and 12–13
(Yu et al., 2003); four were found in P. racemosa, including
compounds 11–14 (Liu and Li, 1997; Wang, 2003; Li et al.,
2004); two were found in P. sinensis, including compounds
12–13 (Zhang et al., 2006). Compounds 1–10 are
phytoecdysteroids, natural polyhydroxylated compounds
with a four-ringed skeleton, usually comprising 27 carbon
atoms or 28–29 carbon atoms with the characteristic 7-en6 ketone on the steroid nucleus (Tarkowská and Strnad,
2016). Phytoecdysteroids are a class of natural steroids
with insect ecdysis activity. They also exhibit extensive
pharmacological effects on higher animals, including
hypoglycemia, wound repair, and immune regulation
(Taha-Salaime et al., 2019; Yusupova et al., 2019).
Compounds 1–7 have no anti-inflammatory, sedative,
anti-convulsant, or anti-cerebra-hypoxic activities in
animal testing with Kunming mice (Zhu et al., 2000).
Most steroids reported in Porana species have been found
in P. discifera. In this case, several issues need to be
addressed. Are these compounds also present in other
plants of this genus, and can they be used as the chemical
indicators of the Porana Burm. f.? Answering these questions
must address the biological activity of steroids among the
pharmacological activities of this genus.
4.2 Coumarins
Three coumarin compounds have been isolated from P.
racemosa, including compounds 15–17 (Li et al., 2004). Four
coumarin compounds have been found in P. sinensis, including
compounds 15–16 (Zhang et al., 2006) and 18–19 (Xue et al.,
2019). Three coumarin compounds have been reported in P.
discifera, including compounds 15–16 and 20 (Yu et al., 2003).
Two coumarin compounds are found in P. spectabilis, including
compounds 15–16 (Zhu et al., 2001). The coumarins obtained
from Porana plants are simple coumarins, and compounds 15
and 16 have been found in four species; these are thought to be
the primary pharmacodynamic substances and chemical
indicators of E. caulis (Chen et al., 2014; Chen et al., 2020).
Therefore, compounds 15 and 16 are essential for applying P.
sinensis as a substitute for E. caulis.
4 Chemical compositions of Porana
plants
Based on literature reports and our previous research, we
concluded that the research on the phytochemical
constituents of this genus focused on P. discifera, P.
racemosa, P. sinensis, P. spectabilis, and P. duclouxii.
Fifty-nine compounds have been isolated from Porana
species, including 14 steroids, six coumarins, seven
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TABLE 2 Chemical compositions of Porana plants.
No Compounds
Molecular
formula
Type
Plant parts
and species
References
1
β-ecdysterone
C27H44O7
Steroids
Aerial parts of P.
discifera
Zhu et al. (2000)
2
β-ecdysterone-2-acetate
C29H46O8
Steroids
Aerial parts of P.
discifera
Zhu et al. (2000)
3
β-ecdysterone-3-acetate
C29H46O8
Steroids
Aerial parts of P.
discifera
Zhu et al. (2000)
4
β-ecdysterone-25-acetate
C29H46O8
Steroids
Aerial parts of P.
discifera
Zhu et al. (2000)
5
2,3-acetonide-β-ecdysterone
C30H48O7
Steroids
Aerial parts of P.
discifera
Zhu et al. (2000)
6
20,22-acetonide-β-ecdysterone
C30H48O7
Steroids
Aerial parts of P.
discifera
Zhu et al. (2000)
7
2-deoxy-20-hydroxyecdysone
C27H44O6
Steroids
Aerial parts of P.
discifera
Zhu et al. (2000)
8
2-deoxyecdysterone-20,22-acetonide
C30H48O6
Steroids
Aerial parts of P.
discifera
Zhu et al. (2000)
9
2-deoxyecdysterone-3-O-β-D-glucopyranoside
C33H54O11
Steroids
Aerial parts of P.
discifera
Zhu et al. (2000)
10
Posterone
C21H30O5
Steroids
Aerial parts of P.
discifera
Zhu et al. (2000)
11
Racemosol
C30H50O
Steroids
Whole plants of P.
racemosa
Li et al. (2004)
12
β-sitosterol
C29H50O
Steroids
Stems and roots of P.
racemosa
Liu and Li, (1997); Yu et al., (2003);
Zhang et al., (2006)
Stems of P. sinensis
Leaves and stems of
P. discifera
13
β-daucosterol
C35H60O6
Steroids
Whole plants of P.
racemosa
Wang, (2003); Yu et al., (2003); Zhang
et al., (2006)
Stems of P. sinensis
Leaves and stems of
P. discifera
14
Stigmasterol
C29H48O
Steroids
15
Scopoletin
C10H8O4
Coumarins
Whole plants of P.
racemosa
Wang, (2003)
Stems of P. sinensis
Zhu, (2001); Yu et al., (2003); Li et al.,
(2004); Xue et al., (2019)
Whole plants of P.
racemosa
Leaves and stems of
P. discifera
Barks of P. spectabilis
16
Scopolin
C16H18O9
Coumarins
Stems of P. sinensis
Whole plants of P.
racemosa
Zhu, (2001); Yu et al., (2003); Li et al.,
(2004); Xue et al., (2019)
Leaves and stems of
P. discifera
Barks of P. spectabilis
17
Umbelliferone
C9H6O3
Coumarins
Whole plants P.
racemosa
Li et al. (2004)
18
Isoscopoletin
C10H8O4
Coumarins
Stems of P. sinensis
Xue et al. (2019)
19
7-O-[4′-O-(3″,4″-dihydroxycinnamyl)-β-Dglucopyranosyl]-6-methoxycoumarin
C26H26O11
Coumarins
Stems of P. sinensis
Xue et al. (2019)
20
Isofraxidin
C11H10O5
Coumarins
Leaves and stems of
P. discifera
Yu et al. (2003)
(Continued on following page)
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TABLE 2 (Continued) Chemical compositions of Porana plants.
No Compounds
Molecular
formula
Type
Plant parts
and species
References
21
Quercetin-3-O-β-D-glucopyranoside
C21H20O12
Flavonoids
Whole plants of P.
racemosa
Li et al. (2004)
22
Quercetin-3-O-α-L-rhamnopyranoside
C21H20O11
Flavonoids
Whole plants of P.
racemosa
Li et al. (2004)
23
Eupatilin
C18H16O7
Flavonoids
Whole plants of P.
racemosa
Li et al. (2004)
24
4ʹ-Hydroxywogonin
C16H12O6
Flavonoids
Leaves and stems of
P. discifera
Yu et al. (2003)
25
Quercetin
C15H10O7
Flavonoids
Leaves and stems of
P. discifera
Wang, (2003); Yu et al., (2003)
Whole plants of P.
racemosa
26
Kaempferol-3-O-β-D-glucopyranoside
C21H20O11
Flavonoids
Whole plants of P.
racemosa
Wang, (2003)
27
Rutin
C27H30O16
Flavonoids
Whole plants of P.
racemosa
Wang, (2003)
28
Chlorogenic acid
C16H18O9
Quinic acid
derivatives
Stems of P. sinensis
Chen et al., (2013); Chen et al., (2019);
Chen et al., (2020)
29
4-O-caffeoylquinic acid
C16H18O9
Quinic acid
derivatives
Stems of P. sinensis
Chen et al., (2019); Chen et al., (2020)
30
5-O-caffeoylquinic acid
C16H18O9
Quinic acid
derivatives
Stems of P. sinensis
Chen et al., (2019); Chen et al., (2020)
31
3,4-dicaffeoylquinic acid
C25H24O12
Quinic acid
derivatives
Stems of P. sinensis
Chen et al., (2019); Chen et al., (2020)
32
4,5-dicaffeoylquinic acid
C25H24O12
Quinic acid
derivatives
Stems of P. sinensis
Chen et al., (2019); Chen et al., (2020)
33
3,5-dicaffeoylquinic acid
C25H24O12
Quinic acid
derivatives
Stems of P. sinensis
Chen et al., (2019); Chen et al., (2020)
34
(E)-N-2-(2,3-dihydroxyphenyl) ethyl cinnamamide
C17H17NO3
Amides
Whole plants of P.
racemosa
Li et al. (2004)
35
N-trans-feruloyltyramine
C18H19NO4
Amides
Stems of P. sinensis
Zhang et al. (2006)
36
N-trans-coumaroyltyramine
C17H17NO3
Amides
Stems of P. sinensis
Zhang et al. (2006)
37
Methyl β-D-frucopyranoside
C7H14O6
Others
Whole plants of P.
racemosa
Zhu et al., (2001); Li et al., (2004)
38
Syringaresinol-4-O-β-D-glucopyranoside
C28H36O13
Others
Whole plants of P.
racemosa
39
Poranaside A
C38H66O18
Others
Roots of P. duclouxii
Ding et al. (2014)
40
Poranic acid A
C32H58O16
Others
Roots of P. duclouxii
Ding et al. (2014)
41
Poranic acid B
C32H58O17
Others
Roots of P. duclouxii
Ding et al. (2014)
42
Disciferitriol
C15H28O3
Others
Aerial parts of P.
discifera
Zhu et al. (2007)
43
Cassiachromone
C13H12O4
Others
Leaves and stems of
P. discifera
Yu et al. (2003)
44
Vanillic acid
C8H8O4
Others
Whole plants of P.
racemosa
Wang, (2003)
45
Ethyl 4′-hydroxy-3′-methoxycinnamate
C12H14O4
Others
Whole plants of P.
racemosa
Wang, (2003)
46
Lupeol
C30H50O
Others
Whole plants of P.
racemosa
Wang, (2003)
47
α-amyrin acetate
C32H52O2
Others
Whole plants of P.
racemosa
Wang, (2003)
Barks of P. spectabilis
Zhu et al., (2001); Li et al., (2004)
Barks of P. spectabilis
(Continued on following page)
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TABLE 2 (Continued) Chemical compositions of Porana plants.
No Compounds
Molecular
formula
Type
Plant parts
and species
References
48
4-methoxycinnamic acid
C10H10O3
Others
Whole plants of P.
racemosa
Wang, (2003)
49
2,5-dimethoxy-1,4-benzoquinone
C8H8O4
Others
Stems of P. sinensis
Zhang et al. (2006)
50
Ethyl caffeate
C11H12O4
Others
Stems of P. sinensis
Zhu et al., (2001); Zhang et al., (2006)
Barks of P. spectabilis
51
3-(3,5-dihydroxyphenyl)-2E-propenoic acid
C9H8O4
Others
Barks of P. spectabilis
Zhu et al. (2001)
52
Methyl α-D-frucofuranoside
C7H14O6
Others
Barks of P. spectabilis
Zhu et al. (2001)
53
2,5-dihydroxybenzoic acid
C7H6O4
Others
Barks of P. spectabilis
Zhu et al. (2001)
54
Disciferoside A
C21H38O8
Others
Aerial parts of P.
discifera
Zhu, (2001)
55
(4R)-menthane-1S,2S,8-triol
C10H20O3
Others
Aerial parts of P.
discifera
Zhu, (2001)
56
1β,2β,3α,4β,5α-cyclohexanepentol
C6H12O5
Others
Aerial parts of P.
discifera
Zhu, (2001)
57
Dodecandral-3-O-β-D-xylopyranoside
C38H54O4
Others
Aerial parts of P.
discifera
Zhu, (2001)
58
E-piceid
C20H22O8
Others
Aerial parts of P.
discifera
Zhu, (2001)
59
2,5-dihydroxybenzaldehyde
C7H6O3
Others
Aerial parts of P.
discifera
Zhu, (2001)
4.3 Flavonoids
4.5 Amides
Six flavonoids have been isolated from P. racemosa, including
compounds 21–23 (Li et al., 2004) and 25–27 (Wang, 2003). Two
flavonoids were found in P. discifera, including compounds
24–25 (Yu et al., 2003). Flavonoids are very common in
plants. According to reports, no characteristic flavonoid has
been found in this genus; this might be due to the lack of
reports on the chemical constituents of Porana plants.
However, several characteristic isoflavones, pterocarpans, and
rotenoids were identified in Erycibes plants (Peng et al., 2021).
Based on this, we speculate that flavonoids might be the
components differentiating Porana from Erycibes. Considering
flavonoids’ excellent biological activity, exploring such
compounds should not be ignored.
Three amides have been isolated from Porana plants, among
which compound 34 has been found in P. racemosa (Li et al.,
2004) and compounds 35–36 have been found in P. sinensis
(Zhang et al., 2006). The chemical structures of the three amides
are similar. It was reported that compound 36 has better activity
than compound 35 in inhibiting nitric oxide (NO) release from
lipopolysaccharide (LPS)-induced RAW 264.7 cells, suggesting
that introducing a methoxy group at the two-position reduces the
anti-inflammatory activity of these compounds (Zheng et al.,
2018).
4.6 Other compounds
Twenty-three compounds were found in Porana species,
including one lignin (compound 38), one monoterpenoid
(compound 55), two sesquiterpenes (compound 42, 54),
three triterpenoids (compound 46, 47, 57), one
benzoquinone (compound 49), seven phenols (compounds
44, 45, 48, 50, 51, 53, 59), one stilbene (compound 58), five
glycosides compounds (compound 37, 39–41, 52), one
chromone (compound 43), and one cyclohexanol
(compound 56). There are many phenolic acids and their
derivatives in Porana plants. Resin glycosides are
characteristic of constituents in Convolvulaceae, and three
such components (compounds 39–41) have been isolated
4.4 Quinic acid derivatives
Six quinic acid derivatives have been reported in the Porana
species, including compounds 28–33 (Chen et al., 2013; Chen
et al., 2019; Chen et al., 2020), all from P. sinensis. Our fingerprint
study has revealed that Porana dinetoides C.K.Schneid., P.
racemosa, and P. duclouxii also contained quinic acid
derivatives (Figure 3). Because many quinic acid derivatives
have been detected in fingerprints, this group of compounds
can be used as chemical markers for quality control, and this
potential deserves further evaluation.
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FIGURE 2
Structural formulas of chemical components of genus Porana.
a phytochemical study of other species needs to be performed
urgently.
from Porana plants (Ding et al., 2014). Compounds 39–41 all
have a common trisaccharide moiety and (11S)hydroxytetradecanoic
acid
or
(3S,11S)dihydroxytetradecanoic acid as the aglycone. These
23 compounds have not shown any regularity. There is no
evidence to assess the importance of these compounds
regarding quality control or biological activity.
In summary, only five species of Porana plants have been
reported, with a total of 59 compounds to date. Combined with
the literature reports and fingerprints, phenolic acids and
coumarins are widely represented in this genus.
Phytoecdysteroids and resin glycosides have specific
characteristics; however, their distribution is narrow in this
genus. This finding suggests that there might be substantial
differences in the chemical compositions of these plants, and
Frontiers in Pharmacology
5 Pharmacological activities of
Porana plants
5.1 Network analysis of Porana plants
Because the research on this genus is not systematic, to
maximize its medicinal value, we first predicted its targets
based on its chemical components using network analysis.
Using follow-up comparisons with reported pharmacological
research results, the pharmacological effects of this genus were
explored.
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FIGURE 3
HPLC fingerprints of four species of genus Porana 1) 5-O-caffeoylquinic acid; 2) Scopolin; 3) Chlorogenic acid; 4) 4-O-caffeoylquinic acid; 5)
Scopoletin; 6) 3,5-dicaffeoylquinic acid; 7) 3,4-dicaffeoylquinic acid; 8) 4,5-dicaffeoylquinic acid.
5.1.1 Enrichment of critical targets
diseases such as prostate cancer, viral carcinogenesis, glioma, or
other irrelevant items, with p < 0.01 as the screening condition,
the top 20 most significant pathways were selected for the
subsequent enrichment analysis using R language software
(Supplementary Table S1). As shown in Figure 4, the abscissa
(enrichment) of the bubble chart represents the ratio of the core
targets involved in each pathway to the total number of targets in
the pathway; the size of the bubble represents the number of core
targets involved in the pathway; the color ranges from red to
green, indicating that the p-value is from small to large, and
deeper redness indicates the higher significance of the pathway.
The two-dimensional structures of all 59 compounds found
in Porana plants were identified in the PubChem database
(https://pubchem.ncbi.nlm.nih.gov/search/), their sdf files were
downloaded, and they were imported into the Swiss Target
Prediction database (http://www.swisstargetprediction.ch/) to
predict their targets (Gfeller et al., 2014). After removing the
duplicate targets, the potential targets were obtained. We
obtained 713 targets in this manner.
5.1.2 The construction and topological
parameter analysis of a protein-protein
interaction network
5.1.4 The construction and analysis of the
compound-target-pathway network
All 713 targets obtained in section 5.1.1 were imported into
the STRING platform (https://string-db.org/) to construct a PPI
network. The topological parameters of the PPI network were
calculated and analyzed using Cytoscape 3.6.0. The critical
targets were determined with greater values of the degree,
closeness centrality, and betweenness centrality than the mean
value. This analysis revealed that the mean degree of potential
target nodes was 39.5, the mean value of closeness centrality was
0.4326, and the mean value of betweenness centrality was 0.0019.
The output was 135 targets with a higher value than the
corresponding mean.
According to the top 20 pathways of gene enrichment in the
KEGG pathway enrichment analysis, the potential targets and the
corresponding components enriched in these pathways were
outputted. The data table of the C-T-P was imported into
Cytoscape 3.6.0 to construct the C-T-P network with a total
of 148 nodes (20 pathways, 73 targets, 55 components) and
772 edges. Then the Network Analyzer was used to calculate the
topology parameters of the C-T-P network, while a Degree
Sorted Circle Layout was applied to lay out nodes. The C-T-P
network topology parameters were also analyzed using Network
Analyzer, and the results are displayed in Supplementary Table
S2. The mean degree of the 55 differentially active components
was 7.29, the mean value of closeness centrality was 0.3505, and
the mean value of betweenness centrality was 0.0067. Three
network topology parameters with 17 components were
higher than the corresponding mean value (compounds 1–5,
7, 16–17, 23–25, 34–36, 45, 48, and 50). The mean degree of the
73 potential target nodes was 10.58, the mean value of closeness
5.1.3 Kyoto encyclopedia of genes and genomes
pathway enrichment analysis
To explore the related signaling pathways of the 135 targets
obtained in Section 5.1.2, the targets were imported into DAVID
(https://david.ncifcrf.gov/home.jsp), with the species limited to
humans. KEGG pathway enrichment analysis was performed to
identify the relevant signaling pathways. After removing specific
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FIGURE 4
Analysis of KEGG pathway.
rats by inhibiting inflammatory responses and angiogenesis
(Pan et al., 2009); the mechanisms might involve the PI3KAkt, HIF-1, and MAPK signaling pathways (Park et al., 2015; Qu
et al., 2016; Yang et al., 2018).
Porana plants are widely used in traditional Chinese and
Indian medicine to relieve inflammation and pain and to treat
rheumatoid arthritis. Recent studies demonstrated that the PI3KAkt pathway inhibits apoptosis in chondrocytes, and modulation
of the pathway might be a potential target for the therapy of
rheumatic arthritis (Malemud, 2015). HIF-1α increases the
production of inflammatory cytokines and promotes
angiogenesis in rheumatic arthritis patients (Park et al., 2015).
We reported that the 40% ethanol extract of P. sinensis alleviates
rheumatoid arthritis by regulating the PI3K-Akt and HIF-1
signaling pathways (Hu et al., 2022).
P. racemosa is another plant in the genus Porana with welldocumented medicinal applications, which could be used for the
treatment of colds. The results of network analysis revealed its
primary active components to be scopolin, umbelliferone,
eupatilin, and quercetin, which act on AKT1, EGFR, MAPK1,
NFκB1, PIK3R1, SRC, TNF, and other targets to regulate PI3KAkt, MAPK, and the chemokine signaling pathway, indicating
the main involvement of inflammatory pathway.
MAPK participates in cell proliferation, differentiation,
transformation,
and
apoptosis
regulation
through
phosphorylation of nuclear transcription factors, cytoskeletal
proteins, and enzymes (Yeung et al., 2018). PI3K-Akt
regulates survival, cell growth, differentiation, cellular
centrality was 0.3732, and the mean value of betweenness
centrality was 0.0122. Three network topology parameters of
20 targets were higher than the corresponding mean value
(MAPK1, PIK3CA, AKT1, MAP2K1, MAPK3, EGFR, MMP2,
PRKCA, ESR2, GSK3B, MAPK14, ESR1, PIK3R1, NRAS, SRC,
PTGS2, MMP9, TNF, KDR, and ADORA3). The mean degree of
the 20 pathways was 18.55, the mean value of closeness centrality
was 0.4054, and the mean betweenness centrality was 0.0254.
Three network topology parameters of six signaling pathways
were higher than the corresponding mean value (PI3K-Akt, HIF1, estrogen, MAPK, chemokine, and the thyroid hormone
signaling pathway).
The results of the network analysis revealed 17 active
compounds in Porana species, including six steroids, three
flavonoids, three amides, two coumarins, and three organic
acid esters. In the follow-up quality control study, critical
research should be carried out on the actual content of these
compounds. Coumarins are widely distributed in Porana species,
presenting in P. sinensis, P. racemosa, P. discifera, and P.
spectabilis. Taking coumarin scopolin as an example, its
targets include GSK3B, EGFR, MAPK1, IL2, HSPA8, MMP9,
HK1, GAPDH, TNF, ADORA3, acting on PI3K-Akt, HIF-1,
estrogen, MAPK, and other signaling pathways. Scopolin
promotes the differentiation of osteoblasts and inhibits the
decrease of bone mineral density, participating in osteoporosis
treatment (Park et al., 2020), possibly associated with the
regulation of the estrogen pathway. Intraperitoneal injection
of scopolin alleviates the symptoms of adjuvant arthritis in
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TABLE 3 Bioactivities of the extracts of Porana plants.
No.
Extracts
Species
Part
Condition
Quality
control
Activity
Model
Results
References
1
40%
ethanol
extract
P. sinensis
Stem
40% ethanol
ultrasonic
extraction
HPLC, scopolin
20.07 mg/g,
chlorogenic acid
33.86 mg/g,
scopoletin 7.68 mg/g
plant material
Antiinflammatory
and antinociceptive
activities
In vivo: Xyleneinduced ear edema,
formalin induced
inflammation,
carrageenan-induced
mice air pouch
inflammation in
mice, acetic acidinduced writhing,
formalin-induced
nociception; ig, 143,
285, and 570 mg/kg;
positive control:
dexamethasone
2 mg/kg, aspirin
200 mg/kg,
paracetamol
100 mg/kg
Inhibit the ear
swelling, the
synthesis of PGE2,
reduce the number
of writings, and
relieve phase II pain
in mice
Chen et al.
(2013)
2
80%
methanol
extract
P. sinensis
Stem
80% methanol
ultrasonic
extraction
HPLC, scopolin
1.95 mg/g,
chlorogenic acid
2.55 mg/g, scopoletin
0.25 mg/g plant
material
Antiinflammatory
activity
In vitro: LPS-induced
RAW 264.7 cells; 25,
50, 100 μg/ml
Inhibit LPSinduced RAW
264.7 release of NO,
and iNOS, COX-2
and IL-6 mRNA
expression
Xue et al.
(2017)
3
40%
ethanol
extract
P. sinensis
Stem
40% ethanol
reflux
extraction
HPLC, 5-Ocaffeoylquinic acid
13.4268 mg/g,
scopolin 12.6935 mg/
g, chlorogenic acid
48.5457 mg/g, 4-Ocaffeoylquinic acid
8.2953 mg/g,
scopoletin
20.9330 mg/g, 3,4dicaffeoylquinic acid
28.6063 mg/g, 3,5dicaffeoylquinic acid
13.5660 mg/g, 4,5dicaffeoylquinic acid
18.3498 mg/g plant
material
Antiinflammatory
activity
In vitro: LPS-induced
RAW 264.7 cells;
120 μg/ml; positive
control: methotrexate
120 μg/ml
Inhibit the release
of NO, TNF-α, IL1β and IL-6 in LPSinduced RAW
264.7 cell; attenuate
the severity,
pathological
changes, and
release of cytokines
(IL-6 and HIF-1α)
during rheumatoid
arthritis
progression by
regulating the
PI3K/AKT and
HIF-1 pathways
Hu et al.
(2022)
In vivo: Collageninduced arthritis
model; ig, 0.6, 0.3,
and 0.15 g/kg;
positive control:
methotrexate
1 mg/kg
4
60%
ethanol
extract
P.
paniculata
Whole
plants
Cold
maceration
method
Total flavonoids
59.86 mg/g of
quercetin, total
phenols 33.34 mg/g
of gallic acid
Anti-oxidant
Activity
In vitro: DPPH assay,
superoxide anion
scavenging activity
assay, nitric oxide
scavenging activity
assay, hydrogen
peroxide scavenging
assay and metal
chelating activity; 20,
40, 60, 80 and 100 μg/
ml; positive control:
L-ascorbic acid,
butylated
hydroxyanisole,
alpha tocopherol, 20,
40, 60, 80 and
100 μg/ml
Present good antioxidant activity
Kumar et al.
(2015)
5
80%
methanol
extract of
ten samples
P. sinensis
Stem
80% methanol
ultrasonic
extraction
HPLC, chlorogenic
acid, 4-Ocaffeoylquinic acid, 5O-caffeoylquinic acid,
3,4-dicaffeoylquinic
Anti-oxidant
Activity
In vitro: DPPH assay;
IC50 211–439 μg/ml;
positive control:
ascorbic acid, IC50
38.65 μmol/L
Present good
DPPH_ scavenging
activity, with IC50
values ranging from
211 to 439 μg/ml
Chen et al.
(2020)
(Continued on following page)
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TABLE 3 (Continued) Bioactivities of the extracts of Porana plants.
No.
Extracts
Species
Part
Condition
Quality
control
Activity
Model
Results
References
acid, 4,5dicaffeoylquinic acid,
3,5-dicaffeoylquinic
acid, scopolin,
scopoletin
6
40%
ethanol
extract
P. sinensis
Stem
40% ethanol
reflux
extraction
HPLC, 5-Ocaffeoylquinic acid
6.76 mg/g, scopolin
16.97 mg/g,
chlorogenic acid
21.53 mg/g, 4-Ocaffeoylquinic acid
7.84 mg/g, scopoletin
4.92 mg/g, 3,5dicaffeoylquinic acid
12.41 mg/g, 3,4dicaffeoylquinic acid
14.94 mg/g, 4,5dicaffeoylquinic acid
18.17 mg/g
Anti-gout
Activity
In vivo: monosodium
urate crystal induced
gout arthritis; ig, 1.0,
0.5, and 0.25 g/kg;
positive control:
colchicine 1.5 mg/kg
Regulate the release
of inflammatory
factors and oxygen
free radicals to
prevent and treat
gouty arthritis by
mediating the
TLR2-MyD88
signaling pathway
Du et al.
(2020)
7
80%
methanol
extract of
ten samples
P. sinensis
Stem
80% methanol
ultrasonic
extraction
HPLC, chlorogenic
acid, 4-Ocaffeoylquinic acid, 5O-caffeoylquinic acid,
3,4-dicaffeoylquinic
acid, 4,5dicaffeoylquinic acid,
3,5-dicaffeoylquinic
acid, scopolin,
scopoletin
Anti-gout
Activity
In vitro: xanthine
oxidase inhibitory
activity assay; IC50
26.7–45.5 mg/ml;
positive control:
allopurinol, IC50
0.01 mmol/L
Present good
xanthine oxidase
inhibitory activity,
with IC50 values
ranging from
26.7 to 45.5 mg/ml
Chen et al.
(2020)
Because in vitro studies of extracts have not considered systemic
absorption or metabolism of active compounds, the results of
these studies might be biased.
metabolism, and cytoskeletal reorganization of cells.
Modification of this pathway is strongly implicated in the
pathogenesis of most cancers (Malemud, 2015). The treatment
of cancers is not a traditional application of Porana plants. Due to
the regulatory effect of compounds on multiple anti-cancer
pathways, the genus Porana has excellent application
prospects in anti-cancer drugs.
The targeting pathway of the chemical constituents of Porana
species supports the application of this genus in the treatment of
rheumatoid arthritis, colds, and cancer. However, the application
of Porana plants in treating these diseases needs to be verified in
animal and clinical trials.
5.2.1 Anti-inflammatory and analgesic effects
In a previous study, our group adopted the xylene-induced
mouse ear swelling model, the formalin-induced inflammation
model, and the carrageenan-induced mice air pouch
inflammation model to investigate the anti-inflammatory
activity of 40% ethanol extracts of P. sinensis (extract 1). We
also applied the mouse acetic acid writhing model and the
formalin-induced pain model to investigate its analgesic
effects (Chen et al., 2013). We found that the oral
administration of extract 1 (570 and 285 mg/kg) inhibits ear
swelling in mice by 39.0% and 29.5%, respectively, and the
induced inflammation in formalin mice by 37.3% and 30.8%,
respectively. In the carrageenan-induced mice air pouch
inflammation model, extract 1 significantly inhibits the
synthesis of PGE2. Extract 1 significantly reduces the number
of writings in mice and relieves phase II pain in the formalininduced pain model. The 80% methanol ultrasonic extract of P.
sinensis (extract 2) inhibits LPS-induced RAW 264.7 release of
NO at 25, 50, and 100 μg/ml, with inhibition of iNOS, COX-2,
and IL-6 mRNA expression (Xue et al., 2017). However, this
5.2 Pharmacological activities of the
extracts of Porana plants
For the extracts, various preparation methods lead to
significant differences in chemical composition and
bioactivities. When reviewing the pharmacological effects of
Porana extracts, we focused on the following to facilitate
identifying the reasons for the differences in pharmacological
effects: plant origin and part, extraction methods, quality control
methods, biological activities, and screening models (Table 3).
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xanthine oxidase inhibitory activity of ten batches of the 80%
methanol extract of P. sinensis (extract 7), revealing its good
activity, with IC50 values ranging from 26.7 to 45.5 mg/ml (Chen
et al., 2020). The treatment of gout-related diseases is not
traditionally applied to the genus Porana. Although the
in vitro and in vivo experiments demonstrated the anti-gout
potential of P. sinensis, it remains needs to be verified by clinical
research. In addition, due to the different extraction methods of
these extracts, the active components of anti-gout should be
clarified in the future.
study lacked a positive control. COX-2 is a critical enzyme that
catalyzes the conversion of arachidonic acid to prostaglandins,
and this study confirmed the inhibitory effect of extract 1 on
PGE2 synthesis. We reported that 40% ethanol extract of P.
sinensis (extract 3) inhibits the release of inflammatory mediators
(NO, TNF-α, IL-1β, and IL-6) in LPS-induced RAW 264.7 cells
(Hu et al., 2022). Extract 3 attenuates the severity, pathological
changes, and release of cytokines (IL-6 and HIF-1α) during
rheumatoid arthritis progression by regulating the PI3K/Akt
and HIF-1 pathways (Hu et al., 2022).
There are many studies on the anti-inflammatory and
analgesic efficacy of the extract of P. sinensis in vitro and in
vivo. Compared with methotrexate, aspirin, and other positive
control drugs, these extracts’ anti-inflammatory and analgesic
effects are insignificant. Except for P. sinensis, species such as P.
spectabilis have been recorded for the treatment of chest pain in
folk medicine (Li et al., 1985); however, no experimental
verification has been reported.
5.2.4 Toxicity
Only acute toxicity of P. sinensis has been reported. No mice
died with a single intragastric 40% ethanol extract of P. sinensis at
5 g/kg. The weights, behaviors, and anatomical examinations
showed no apparent abnormalities within 14 days (Chen et al.,
2013). However, because it is a medicinal plant, acute toxicity
evaluation is insufficient, and chronic toxicity tests and clinical
safety evaluations of Porana plants need to be performed.
In summary, the current research on the medicinal effects of
Porana species concentrates on P. sinensis. Although Porana is
widely distributed, its medicinal value is limited. Especially for P.
racemosa, which enjoys abundant folk medicinal records and
good development prospects, its systematic pharmacodynamic
and clinical research is lacking. For the pharmacological study of
the extract, to clarify its pharmacodynamic components,
chemical analysis is required. Some studies have not provided
quality control on the extracts, which would affect the reliability
of these studies.
5.2.2 Anti-oxidant activity
As a chronic inflammatory autoimmune disease, rheumatoid
arthritis is closely related to oxidative stress (Peng et al., 2021).
The 60% ethanol extract (extract 4) of P. paniculata presented
good anti-oxidant activity in DPPH assay, superoxide anion
scavenging activity assay, nitric oxide scavenging activity
assay, hydrogen peroxide scavenging assay and metal
chelating activity (Kumar et al., 2015). In the superoxide
anion scavenging assay, extract 4 exhibited more robust
activity than the positive control butylated hydroxyanisole. In
the hydrogen peroxide scavenging assay, extract 4 (IC50:
25.65 μg/ml) performed almost as well as gallic acid (IC50:
24.29 μg/ml). Our group also tested ten batches of 80%
methanol extract (extract 5) of P. sinensis, all of which
showed good DPPH_ scavenging activity, with IC50 values
ranging from 211 to 439 μg/ml (Chen et al., 2020). However,
the above-mentioned test method for anti-oxidant activity is
based on chemical reaction in vitro, which is far from practical.
Therefore, it is necessary to explore the antioxidant activity in
vivo to clarify the molecular mechanisms of its antioxidant
activity.
5.3 Pharmacological activities of the active
constituents of Porana plants
To further analyze the pharmacological activities of this
genus, we followed the pharmacological studies of compounds
in this genus and discussed their correlation with the results of
our network analysis. The results are summarized in Table 4.
5.3.1 Anti-inflammatory and analgesic effects
The results of long-term folk medicinal and network analysis
indicated that anti-inflammatory and analgesic effects are the
primary medicinal effects of Porana plants. The intraperitoneal
injection of scopoletin (compound 15, 1, 5, 10 mg/kg) reduced
serum levels of NO, TNF-α, and PGE2 of carrageenan-induced
paw edema mice, and the protein expression of iNOS and COX-2
(Chang et al., 2012). Scopoletin reduced the amount of writhing
in the mouse acetate writhing model and formalin-induced pain
in the late phase. The anti-inflammatory and analgesic effects of
scopoletin (10 mg/kg) are equivalent to that of indomethacin
(10 mg/kg) (Chang et al., 2012). However, scopoletin was given
by intraperitoneal injection, which would limit its application. In
the carrageenan-induced mouse model of pleurisy,
5.2.3 Anti-gout effect
In a previous study, we applied the strategy of network
analysis combined with experimental verification to study the
mechanism of the 40% ethanol extract of P. sinensis (extract 6)
against gout. Extract 6 (0.25, 0.5, 1.0 g/g) dose-dependently
reduced joint swelling in rats with monosodium urate (MSU)
crystal-induced gout arthritis, with decreased serum MDA and
IL-1β levels, and increased serum SOD, TGF-β, and IL-4 levels.
By mediating the TLR2-MyD88 signaling pathway, it regulates
the release of inflammatory factors and oxygen free radicals to
prevent and treat gouty arthritis (Du et al., 2020). Because
xanthine oxidase is a target for gout treatment, we tested the
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TABLE 4 Bioactivities of the active compounds of Porana plants.
No.
Compounds
Activities
Dosage
Model
Positive
control
Results
References
1
Scopoletin
Antiinflammatory
and antinociceptive
activities
Ip: 1, 5, 10 mg/kg
Acetic acid induced writhing
response, formalin test and
λ-carrageenan induced paw
edema in ICR mice
Indomethacin, ip,
10 mg/kg
Reduce the levels of NO,
TNF-α, PGE2, and the
protein expression of iNOS
and COX-2 in the serum of
carrageenan-induced paw
edema mice, reduce the
number of writhing in the
mouse acetate writhing
model, and the formalininduced pain in the late
phase
Chang et al.
(2012)
2
Scopoletin
Antiinflammatory
activity
Ip: 0.1, 1, 5 mg/kg
Carrageenan-induced
inflammation in the mouse
model of pleurisy
Dexamethasone, ip,
0.5 mg/kg
Reduce serum NO, TNF-α
and IL-1β levels, and inhibit
p65, p38 phosphorylation in
mouse lungs
Pereira dos
Santos
Nascimento
et al. (2016)
3
Scopoletin
Antiinflammatory
activity
15, 30, 60 μmol/L
IL-1β induced fibroblast-like
synoviocytes
-
Inhibit the production of IL6, and the phosphorylation
of p38, ERK, PKC and CREB
Dou et al.
(2013)
4
Scopolin
Antiinflammatory
and antinociceptive
activities
Ip: 25, 50,
100 mg/kg
Adjuvant-induced arthritis
in rats
Dexamethasone, ip,
2 mg/kg
Alleviate the symptoms of
adjuvant-induced arthritis
by inhibiting the expression
of IL-6, VEGF and FGF-2 in
synovial tissue
Pan et al. (2009)
5
Umbelliferone
Antiinflammatory
activity
Oral
administration:
20, 40 mg/kg
2,4-dinitrochlorobenzene
and house dust mite extract
treated mice
Dexamethasone,
oral administration,
1 mg/kg
Reduce ear thickness, spleen
size and weight, serum levels
of IgE, IgG1, IgG2a, TNF-α,
and IL-4, and mast cell
infiltration
Lim et al. (2019)
6
Isofraxidin
Antiinflammatory
activity
1, 10, 50 μmol/L
IL-1β induced inflammatory
response in human
osteoarthritis chondrocytes
-
Block IL-1β-stimulated
production of NO and
PGE2, inhibit the expression
of COX-2, iNOS, MMP-1,
MMP-3, MMP-13,
ADAMTS-4 and -5,
suppress IκB-α degradation
and NF-κB activation
Lin et al. (2018)
7
3,4dicaffeoylquinic
acid
Antiinflammatory
activity
35, 70,
140 μmol/L
LPS-induced RAW
264.7 cells
Inhibit NO/iNOS and
PGE2/COX-2 pathways,
block the nucleus
translocation of NF-κB
Xue et al. (2019)
Antiinflammatory
activity
Ig: 10, 20 mg/kg
Acute airway inflammation
induced by ammonia liquor
in mice
Prednisone acetate,
ig, 10 mg/kg
Reduce the total leukocytes
in the bronchoalveolar
lavage fluid
Wu et al. (2016)
3,5dicaffeoylquinic
acid
4,5dicaffeoylquinic
acid
8
3,4dicaffeoylquinic
acid
3,5dicaffeoylquinic
acid
4,5dicaffeoylquinic
acid
9
Eupatilin
Antiinflammatory
activity
1, 10, 100 μmol/L
LPS-stimulated
macrophages
-
Inhibit the inflammatory
modulators and NF-κB
activation
Choi et al.
(2011)
10
Eupatilin
Antiinflammatory
activity
1, 2, 5, 10 μmol/L
Murine arthritis model;
human rheumatoid
synoviocytes
-
Inhibit TNF-α-induced IL-6
and IL-1β mRNA
Kim et al.
(2015)
(Continued on following page)
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TABLE 4 (Continued) Bioactivities of the active compounds of Porana plants.
No.
Compounds
Activities
Dosage
Model
Positive
control
Results
References
expression, suppress
osteoclast differentiation
11
Quercetin
Antiinflammatory
activity
Oral gavage:
30 mg/kg
Collagen-induced arthritis in
C57BL/6 mice
Methotrexate, ip,
0.5 mg/kg
Decrease serum TNF-a, IL1β, IL-17, and MCP-1 levels
Haleagrahara
et al. (2017)
12
Quercetin
Antiinflammatory
activity
Ip
Adjuvant-induced arthritis
in C57BL/6 mice; mice air
pouch model
Dexamethasone
Reduce neutrophil
infiltration and promote the
apoptosis of activated
neutrophils by inhibiting
neutrophil activities
Yuan et al.
(2020)
13
β-ecdysterone
Antiinflammatory
activity
Subcutaneous
injection: 0.6, 0.8,
1.0 mg/kg
Monoiodoacetate-induced
osteoarthritis in rats
3-methyladenine,
ip, 30 mg/kg;
rapamycin, ip,
1 mg/kg
Inhibit 3-methyladenineinduced apoptosis of
chondrocytes, downregulate PI3K, p-AKT1,
p-mTOR, p-p70S6K and
caspase-3 expression,
activate autophagy in
chondrocytes
Tang et al.
(2020)
14
N-transferuloyltyramine
Antiinflammatory
activity
6.25, 12.5, 25,
50 μg/ml
LPS-induced RAW
264.7 cells
-
Suppress mRNA expression
of COX-2 and iNOS via
suppression of AP-1 and
JNK signaling pathway
Jiang et al.
(2015)
15
Scopoletin
Anti-gout
activity
Ip: 50, 100,
200 mg/kg; 30,
100, 300 μmol/L
Monosodium urate (MSU)
crystal-induced
inflammation in mouse air
pouch model; MSU crystalstimulated RAW 264.7 cells
Prednisolone, ip,
10 mg/kg
Decrease the number of
neutrophils and
mononuclear phagocytes of
monosodium urate (MSU)
crystal-induced
inflammation in mouse;
suppress the secretions of
IL-1β, TNF-α, IL-6,
PGE2 and NO in MSU
crystal-stimulated RAW
264.7 cells, involving the
suppression of NF-κB
activation and blockade of
MAPK signal pathway
Yao et al. (2012)
16
Scopoletin
Anti-gout
activity
Ig: 4.9 mg/kg
Monosodium urate crystal
induced gout arthritis in rats
Colchicine, ig,
1.5 mg/kg
Inhibit the production of
serum MDA, IL-1β, TGF1β, promote the release of
SOD and IL-4, as well as
inhibit the expression of
TLR2 and MyD88 mRNA in
rat joint synovium
Du et al. (2020)
17
3,5dicaffeoylquinic
acid
Anti-gout
activity
60, 120, 240, 480,
960 μmol/L
Xanthine oxidase
Allopurinol
Exhibit weak xanthine
oxidase inhibitory activity
Chen et al.
(2014)
Anti-cancer
activity
3.56, 6.12, 12.5,
25, 50,
100 μmol/L
The normal cell line
HCvEpC and the cervical
cancer cell lines DoTc2,
SiHa, HeLa, and C33A
-
Inhibit the growth of DoTc2,
SiHa, HeLa, and C33A cells;
the apoptotic cell death in
HeLa cells has involved the
up-regulation of Bax,
caspase 3, 8, and 9, the
downregulation of Bcl-2,
and the blockade of the
PI3K/AKT pathway
Tian et al.
(2019)
3,4dicaffeoylquinic
acid
4,5dicaffeoylquinic
acid
18
Scopoletin
(Continued on following page)
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TABLE 4 (Continued) Bioactivities of the active compounds of Porana plants.
No.
Compounds
Activities
Dosage
Model
Positive
control
Results
References
19
Umbelliferone
Anti-cancer
activity
5, 25, 50, 100,
150 μmol/L
Human renal carcinoma
cells
-
Reduce cell proliferation and
induce apoptotic events by
regulating Ki67, MCM2,
Bcl-2, CDK2, CyclinE1,
CDK4, and CyclinD1
Wang et al.
(2019)
20
Isofraxidin
Anti-cancer
activity
5, 10, 20, 40,
80 μmol/L
Human colorectal cancer
cells HT-29 and SW-480
-
Bate cell proliferation,
induce cell apoptosis, and
decrease the expression of
anti-apoptotic protein Bcl-2;
block Akt pathway via
inhibition expression of
p-Akt
Shen et al.
(2017)
21
5-Ocaffeoylquinic
acid
Anti-cancer
activity
1, 10, 50 μmol/L
p53 wild-type A549 and p53deficient H1299 non-small
cell lung cancer cells
-
Abrogate mitogenstimulated invasion but not
proliferation by the
inactivation of p70S6Kdependent signaling
pathway
In et al. (2016)
22
Chlorogenic acid
Anti-cancer
activity
50, 100,
200 μmol/L
U2OS, Saos-2, and MG-63
osteosarcoma cells
-
Inhibit cell proliferation
Sapio et al.
(2020)
23
Chlorogenic acid
Anti-cancer
activity
40 mg/kg
4T1 breast cancer tumors in
BALB/c mice
-
Participated in the induction
of apoptosis, involving the
increase of Bax/Bcl-2 ratio,
the genes of p53 and
caspase-3
Changizi et al.
(2021)
24
Chlorogenic acid
Anti-cancer
activity
250, 1000 μmol/L
HCT116 and HT29 human
colon cancer cell lines
-
Inhibit the viability
associated with the
induction of cell cycle arrest
at the S phase and the
suppression of extracellular
signal related kinase
activation
Hou et al.
(2017)
25
Eupatilin
Anti-cancer
activity
40, 80, 120, 160,
200, 240, 280,
320 μmol/L
Human malignant glioma
cell lines U251MG, U118,
T98G, and U87MG
-
Inhibit the viability and
proliferation of glioma cells
by arresting the cell cycle at
the G1/S phase, and disrupt
the structure of the
cytoskeleton and affect
F-actin depolymerization
via the p-LIMK/cofilin
pathway
Fei et al.
(2019b)
26
Eupatilin
Anti-cancer
activity
12.5, 25,
50 μmol/L
Human prostate PC3,
LNCaP cancer cells and
prostatic epithelial RWPE-1
cells
-
Inhibit the proliferation,
metastasis and spread of
prostate cancer cells through
modulation of PTEN and
NF-κB pathway
Serttas et al.
(2021)
27
Eupatilin
Anti-cancer
activity
2.5, 5, 10, 20,
40 μmol/L; 10,
50 mg/kg
Human esophageal cancer
cell line TE1; TE1 xenograft
mouse model
-
Inhibit the Akt and ERK
pathways
Wang et al.
(2018b)
28
4ʹHydroxywogonin
Anti-cancer
activity
0.1, 1, 10 μg/ml
SW620 colorectal cancer cell
Wortmannin,
10 μmol/L
Reduce the viability,
suppress the proliferation by
disrupting PI3K/AKT
pathway
Sun et al. (2018)
29
N-transferuloyltyramine
Anti-cancer
activity
64, 128, 192, 256,
320 μmol/L
HepG2 and L02 human
hepatoma cells
Taxol
Inhibit the proliferation
Gao et al. (2019)
30
Scopoletin
Anti-diabetic
activity
Ig: 0.01 g/100 g
diet
Streptozotocin induced
diabetic mice
Metformin, 0.5 g/
100 g diet
Reduce blood glucose and
glycated hemoglobin, serum
ALT, TNF-α, IL-6 levels,
glucose intolerance, and
hepatic lipid accumulation,
down-regulate hepatic gene
Choi et al.
(2017)
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TABLE 4 (Continued) Bioactivities of the active compounds of Porana plants.
No.
Compounds
Activities
Dosage
Model
Positive
control
Results
References
expression of triglyceride
and cholesterol synthesis as
well as inflammation (TLR4,
MyD88, NF-κb1, TNF-α,
and IL-6)
31
Scopoletin
Anti-diabetic
activity
Ig: 1 mg/kg
High fructose diet induce
type 2 diabetes rats
-
Reduce blood glucose,
insulin and lipid levels,
involving the activation of
IRS1, PI3K and AKT
phosphorylation
Kalpana et al.
(2019)
32
Scopoletin
Anti-diabetic
activity
Ig: 10 mg/kg
Streptozotocin induced
diabetes mice
Acarbose, Ig,
10 mg/kg
Inhibit the activity of αglucosidase and α-amylase
and reduce postprandial
blood glucose levels
Jang et al.
(2018)
33
Scopoletin
Phagocytic
activity
50 μg/ml
Human U937 monocytic cell
line
-
Enhance the phagocytic
activity, which involving the
down-regulation of seven
genes (CDC42, FCGR1A/
FCGR1C, ITGA9, ITGB3,
PLCE1, RHOD & RND3)
and up-regulation of five
genes (DIRAS3, ITGA1,
PIK3CA, PIK3R3 & PLCD1)
Alkorashy et al.
(2020)
34
Scopoletin
Anti-fungal
activity
12.5–200 μg/ml
Candida tropicalis
Fluconazole,
62.5–1000 μg/ml
Affect both planktonic and
biofilm forms
Lemos et al.
(2020)
injection of scopolin (compound 16, 50, and 100 mg/kg)
alleviated the symptoms of adjuvant-induced arthritis in rats
by inhibiting the expression of IL-6, VEGF, and FGF-2 in rat
synovial tissue. Li et al. (2019) established an LC-MS/MS method
for the simultaneous determination of scopolin and scopoletin in
rat biomatrices, while the bioavailability of scopolin was
exceptionally low.
There are also many reports on umbelliferone’s antiinflammatory and analgesic activities (compound 17) and
isofraxidin (compound 20). Oral administration of
umbelliferone (20 and 40 mg/kg) for 28 days led to significant
decreases in ear thickness, spleen size and weight, and serum
levels of IgE, IgG1, IgG2a, TNF-α, and IL-4. There were also
decreases in mast cell infiltration on 2,4-dinitrochlorobenzene
and house dust mite extract-treated mice (Lim et al., 2019).
Umbelliferone reduced the secretion of pro-inflammatory
cytokines
and
chemokines
in
TNF-α/IFN-γ-treated
HaCaT cells via the regulation of the MAPK, IkB-α/NF-κB,
and STAT1 signaling pathways (Lim et al., 2019). There are
many reports on isofraxidin in the treatment of osteoarthritis (Jin
et al., 2018; Wang and Wang, 2021). For example, isofraxidin (1,
10, and 50 μmol/L) blocked IL-1β-stimulated production of NO
and PGE2, inhibited the expression of COX-2, iNOS, MMP-1,
MMP-3, MMP-13, ADAMTS-4 and -5, and suppressed IL-1βinduced IκB-α degradation and NF-κB activation in human
osteoarthritis chondrocytes (Lin et al., 2018); it should be
noted that there was no positive control group in this study.
intraperitoneal injection of scopoletin (1 mg/kg) reduced serum
NO, TNF-α, and IL-1β levels and inhibited p65,
p38 phosphorylation in mouse lungs (Pereira dos Santos
Nascimento et al., 2016). Dou et al. (2013) reported that
scopoletin (15, 30, 60 μmol/L) significantly inhibited the
production of IL-6 in fibroblast-like synoviocytes induced by
IL-1β and the phosphorylation of p38, ERK, PKC, and CREB.
These findings suggest that scopoletin might play a role by
mediating the MAPK/PKC/CREB pathways. It should be
noted that this study lacks a positive control. P38 MAPK is
relevant to human inflammatory disease, and inhibition of
p38 phosphorylation reduces gene expression of many
inflammatory mediators (Dou et al., 2013). The regulatory
effect of scopoletin on the MAPK signaling pathway is
consistent with the results of network analysis. These findings
suggest that scopoletin exerts anti-inflammatory and analgesic
effects through multiple targets and pathways, indicating its good
medicinal potential (Parama et al., 2022). However, due to the
instability of scopoletin under physiological media and poor
water solubility, its oral bioavailability is only 6.0%, severely
restricting its medicinal application (Sakthivel et al., 2022). With
the rapid development of pharmaceutical technology, new drug
delivery systems have introduced possible applications of
scopoletin in recent years. For example, there is a formulation
of soluplus-based micelles for scopoletin, which increases its
absorption, bioavailability, and tissue distribution 33-fold (Zeng
et al., 2017). Pan et al. (2009) reported that intraperitoneal
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There are several anti-inflammatory and analgesic active
ingredients in Porana species, including coumarins, quinic
acid derivatives, flavonoids, steroids, and amides. The results
of the components (scopolin, umbelliferone, eupatilin, quercetin,
N-trans-feruloyltyramine) pathways (PI3K-Akt, HIF-1, MAPK,
chemokine) in our network analysis are consistent with the
results of the literature review, which suggests the potential of
Porana species in the treatment of arthritis. However, it should
be noted that, although components such as scopoletin and
eupatilin show good anti-inflammatory and analgesic effects,
their bioavailability is relatively low. Further structural
modification is needed, or new drug delivery systems should
be developed to improve their bioavailability.
Pharmacokinetic studies demonstrated in vivo its rapid
absorption after oral applications (Majnooni et al., 2020).
The HPLC fingerprints of the Porana plants (Figure 3)
showed that quinic acid derivatives frequently appear in
different Porana species. The anti-inflammatory, analgesicrelated pharmacodynamics of chlorogenic acid has been
reported in many studies and associated with the NF-κB,
MAPK, and JNK/AP-1 signaling pathways; they have also
been associated with the downregulation of TNF-α, COX-2,
and PGE2 (Bagdas et al., 2020). Xue et al. (2019) applied the
method of D101 macroporous resin to track the antiinflammatory components in P. sinensis; Compounds 31–33
inhibited NO/iNOS and PGE2/COX-2 pathways, and the
nuclear translocation of NF-κB was also blocked. Wu et al.
(2016) reported that compounds 31–33 reduce mouse
ammonia liquor-induced acute airway inflammation by
reducing the total leukocytes in bronchoalveolar lavage fluid.
Among these three compounds, 4,5-dicaffeoylquinic acid
exhibited the most potent effect, suggesting that the structureactivity relationship requires further elaboration.
Seven flavonoids have been isolated from Porana species.
Eupatilin (compound 23) and quercetin (compound 25) present
diverse anti-inflammatory activities. Eupatilin exerts antiinflammatory effects by regulating NF-κB (Choi et al., 2011),
TLR4/MyD88 (Fei et al., 2019a), AMPK (Zhou et al., 2018), and
by suppressing osteoclast differentiation (Kim et al., 2015),
inhibiting oxidative stress (Ali et al., 2017). Although eupatilin
has broad bioactivity, its oral bioavailability is only 2.7% (Wang
et al., 2018a). Quercetin is a broad-spectrum anti-inflammatory
and analgesic substance without specificity. Considering the folk
medicinal application of Porana plants, we only focused on its
application in arthritis. Quercetin decreased serum TNF-a, IL-1β,
IL-17, and MCP-1 levels in a collagen-induced mouse arthritis
model (Haleagrahara et al., 2017). The authors claimed that
quercetin produces better activity than methotrexate, which
might not be accurate due to the different doses and routes of
administration (quercetin, Po with 30 mg/kg; methotrexate, Ip
with 0.5 mg/kg). MCP-1 (chemokine ligand 2) has a critical role
in inflammation (Singh et al., 2021). These studies confirmed the
regulatory effect of Porana plants on the chemokine pathway in
network analysis. Yuan et al. (2020) found that quercetin reduces
neutrophil infiltration and promotes apoptosis in activated
neutrophils; however, this study did not provide the dosage of
quercetin and the positive control dexamethasone.
β-Ecdysterone (compound 1) inhibited 3-methyladenineinduced apoptosis of chondrocytes, downregulated PI3K,
p-AKT1, p-mTOR, p-p70S6K, and caspase-3 expression, and
activated autophagy in chondrocytes in a rat model of
monoiodoacetate-induced osteoarthritis (Tang et al., 2020).
N-trans-feruloyltyramine (compound 35) strongly suppressed
mRNA expression of COX-2 and iNOS via suppression of AP-1
and the JNK signaling pathway in LPS-induced RAW 264.7 cells
(Jiang et al., 2015).
Frontiers in Pharmacology
5.3.2 Anti-gout effect
Intraperitoneal injection of scopoletin (compound 15, 100,
and 200 mg/kg) significantly lowered the number of neutrophils
and mononuclear phagocytes of MSU-induced inflammation in a
mouse air pouch model. The secretion of IL-1β, TNF-α, IL-6,
PGE2, and NO were suppressed by scopoletin (30–300 μmol/L)
at the transcriptional level in MSU-stimulated RAW 264.7 cells,
mediated by the suppression of NF-κB activation and blockade of
the MAPK signal pathway (Yao et al., 2012). In our previous
study, we also found that scopoletin (4.9 mg/kg) inhibited the
production of serum MDA, IL-1β, and TGF-1β, promoted the
release of SOD and IL-4 and inhibited the expression of
TLR2 and MyD88 mRNA in rat joint synovium (Du et al.,
2020). In another study, we found that 3,4-dicaffeoylquinic
acid (compound 31, IC50: 0.32 mmol/L), 4,5-dicaffeoylquinic
acid (compound 32, IC50: 0.26 mmol/L), and 3,5dicaffeoylquinic acid (compound 33, IC50: 0.21 mmol/L)
exhibited weak xanthine oxidase inhibitory activity (Positive
control: allopurinol, IC50: 0.01 mmol/L) (Chen et al., 2014),
partially explaining the phytochemistry of anti-gout activity.
In summary, scopoletin plays an anti-gout role primarily by
regulating inflammatory pathways, and quinic acid derivatives
have xanthine oxidase inhibitory activity. Due to a large amount
of anti-inflammatory, analgesic, antioxidant, and xanthine
oxidase-inhibiting ingredients, the genus Porana has excellent
application prospects as anti-gout therapies. However, only P.
sinensis has been reported to treat acute gouty arthritis.
Therefore, the anti-gout efficacy of other species in this genus
must be further explored.
5.3.3 Anti-cancer activity
Scopoletin (compound 15) inhibited the growth of cervical
cancer cell lines, including DoTc2, SiHa, HeLa, and C33A cells,
with the IC50 values ranging from 7.5 to 25 μmol/L. The
apoptotic cell death in HeLa cells induced by scopoletin
involved the upregulation of Bax, caspase 3, 8, and 9, the
downregulation of Bcl-2, and the blockade of the PI3K/Akt
pathway. Scopoletin also caused cell cycle arrest at the G2/M
phase and inhibited cell migration (Tian et al., 2019).
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the expression of VEGF-A decreased dose-dependently (Sun
et al., 2018). Based on this study, it could be presumed that
the anti-angiogenic activity of PI3K inhibitors was at least
partially mediated by their capacity to reduce VEGF levels.
N-trans-feruloyltyramine (compound 35) inhibits the
proliferation of HepG2 cells with an IC50 of 194 ±
0.894 μmol/L, which was significantly lower than the positive
control taxol (IC50: 26 ± 0.128 μmol/L) (Gao et al., 2019).
Comparing the results on HepG2 and LO2 cells revealed that
N-trans-feruloyltyramine might have selective cytotoxic effects.
In summary, there are many anti-cancer active components
in Porana plants, including coumarins, quinic acid derivatives,
and flavonoids. Of these, scopoletin, umbelliferone, chlorogenic
acid, and eupatilin have many reports on their anti-cancer
activity. These components are widely distributed in nature
and are not specific. Since the related research mostly stays at
the level of in vitro research, and more in vivo research and
clinical studies are needed.
Umbelliferone (compound 17) exerted anti-cancer effects on
various cells and animal models through induction of
apoptosis, cell cycle arrest, reduction of cell proliferation, and
inhibition of the release of inflammatory factors. For example,
treating human renal carcinoma cells with umbelliferoneinduced dose-dependent decreases in Ki67, MCM2, Bcl-2,
CDK2, CyclinE1, CDK4, and CyclinD1 and an increase in
Bax (Wang et al., 2019). Isofraxidin (compound 20,
5–80 μmol/L) significantly bate cell proliferation, induced cell
apoptosis, and decreased the expression of anti-apoptotic protein
Bcl-2 in human colorectal cancer cell lines (HT-29 and SW-480).
Isofraxidin blocks the Akt pathway via inhibition expression of
p-Akt (Shen et al., 2017).
There are many reports on the anti-cancer properties of
quinic acid derivatives in Porana species. 5-O-caffeoylquinic acid
(compound 30) abrogated mitogen-stimulated invasion but not
proliferation in p53 wild-type A549 and p53-deficient
H1299 NSCLC cells. The anti-invasive activity of 5-Ocaffeoylquinic acid in A549 cells might be mediated by the
inactivation of the p70S6K-dependent signaling pathway (In
et al., 2016). Chlorogenic acid (compound 28) inhibited the
proliferation of U2OS, Saos-2, and MG-63 osteosarcoma cells
(50, 100, 200 μmol/L) (Sapio et al., 2020). This compound also
participates in the apoptosis of 4T1 breast cancer tumors in
BALB/c mice, involving the increase of the Bax/Bcl-2 ratio and
the genes for p53 and caspase-3 (Changizi et al., 2021); it inhibits
the viability of HCT116 and HT29 colon cancer cell lines
associated with the induction of cell cycle arrest at the S
phase and the suppression of extracellular signal-related
kinase activation (Hou et al., 2017). These findings suggest
that caffeoylquinic acids exhibit relatively broad anti-cancer
activity, with targeted cancer types including lung cancer,
osteosarcoma, breast cancer, and colon cancer. Chlorogenic
acid inhibits cell proliferation and blocks the cell cycle;
however, 5-O-caffeoylquinic acid does not inhibit cell
proliferation. As isomers, the difference in antiproliferative
effect between these two compounds deserves further
explanation.
The flavonoid eupatilin (compound 23) inhibits the viability
and proliferation of glioma cells by arresting the cell cycle at the
G1/S phase. Eupatilin disrupts the structure of the cytoskeleton
and affects F-actin depolymerization via the p-LIMK/cofilin
pathway (Fei et al., 2019b). However, this study did not report
a proapoptotic effect of eupatilin on glioma, which was
inconsistent with other studies. Eupatilin (12.5, 25, 50 μmol/L)
inhibits the proliferation, metastasis, and spread of prostate
cancer cells through modulation of PTEN and NF-κB
signaling (Serttas et al., 2021); it blocks the proliferation of
esophageal cancer TE1 cells associated with the inhibition of
the Akt and ERK pathways (Wang et al., 2018b). Another
flavonoid, 4ʹ-hydroxywogonin (compound 24), reduced the
viability and suppressed the proliferation of SW620 colorectal
cancer cells angiogenesis by disrupting PI3K/Akt signaling, while
Frontiers in Pharmacology
5.3.4 Anti-diabetic activity
In the streptozotocin-induced diabetic mice model,
scopoletin (compound 15, 0.01 g/100 g diet) reduced blood
glucose and glycated hemoglobin, glucose intolerance, hepatic
lipid accumulation and downregulated hepatic gene expression
of triglyceride and cholesterol synthesis and inflammation
(TLR4, MyD88, NF-κb1, TNF-α, and IL-6). These results
suggest that scopoletin protects against diabetes-induced
steatosis and inflammation by inhibiting lipid biosynthesis
and the TLR4-MyD88 pathway (Choi et al., 2017). However,
this was a single-dose study with substantial differences in the
dosage of the positive control metformin (0.5 g/100 g diet) and
scopoletin, which cannot be used for comparison. In another
study, scopoletin (1 mg/kg) reduced blood glucose, insulin, and
lipid levels in high-fructose diet-induced type 2 diabetes,
involving the activation of IRS1, PI3K, and Akt
phosphorylation (Kalpana et al., 2019). Scopoletin inhibited
the activity of α-glucosidase and α-amylase and reduced
postprandial blood glucose levels in streptozotocin-induced
diabetes mice. Unfortunately, the IC50 value of scopoletin was
85.12 and 37.36 μmol/L for α-glucosidase and α-amylase, which
were lower than acarbose (Jang et al., 2018), indicating that its
potential is limited. Another study reported that scopoletin
stimulated insulin secretion via a K+ATP channel-dependent
pathway in INS-1 pancreatic β cells (Park et al., 2022). Scopoletin
could play a role in treating diabetes by stimulating insulin
secretion, inhibiting α-glucosidase and α-amylase, and
downregulating triglyceride and cholesterol synthesis and
inflammation. However, the inhibitory effect of scopoletin on
α-glucosidase and α-amylase would be weaker than that of the
positive control drug acarbose.
There are many reports on the efficacy and mechanism of
chlorogenic acid (compound 28), quercetin (compound 25), and
rutin (compound 27) in the treatment of diabetes. For example,
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only the chemical composition, efficacy, and quality control of P.
sinensis have been systematically reported, while the medicinal value
of other species in this genus has not yet been explored. Therefore,
we systematically reviewed this genus’s traditional and current use,
chemical compositions, and pharmacological activities. We applied
network analysis to predict the key targets and pathways of chemical
components in this genus to clarify the research status of Porana
species and highlight the directions for the rational medicinal
development of this genus.
Regarding chemical components, only five species of genus
Porana have been reported, with 59 compounds isolated and
identified, including steroids, coumarins, flavonoids, quinic acid
derivatives, and amides. Combined with the fingerprints
(Figure 3), coumarins and quinic acid derivatives are widely
distributed in this genus, while steroids have only been reported in
P. discifera. Because the research on chemical constituents is the
forerunner of medicinal value development, the phytochemical study
of other species in this genus needs to be performed.
In terms of pharmacological effects, the extracts of
Porana plants exhibit anti-inflammatory, analgesic,
antioxidant, and anti-gout activities. However, studies on
the pharmacological effects of Porana plants are focused on
P. sinensis, and there are few pharmacological studies on
other species. Especially for plants with extensive folk
medicinal records (such as P. racemosa), detailed
pharmacodynamic research needs to be performed. The
chemical
constituents
of
Porana
present
antiinflammatory, analgesic, anti-gout, anti-cancer, and
diabetes treatment activities. Gout and diabetes treatment
are not the traditional medicinal applications of Porana
plants. However, this genus contains chemical substances
with appropriate biological activities. Therefore, we
speculate that this genus has the potential to develop in
the direction of anti-gout and anti-diabetes. Future research
needs to investigate different species’ anti-gout and antidiabetic efficacy, explain their mechanism of action, and
systematically elucidate their active components.
Network analysis showed that steroids, flavonoids,
amides, coumarins, and other components maybe be
relevant for anti-inflammatory, analgesic, anti-gout, anticancer, and diabetes treatment activities of Porana plants.
Their targets include GSK3B, EGFR, MAPK1, IL2, HSPA8,
MMP9, HK1, GAPDH, TNF, ADORA3, and their pathways
include PI3K-Akt, HIF-1, estrogen, and MAPK. The
enriched targets and pathways are consistent with the
results of our literature review.
In summary, Porana plants are abundant in natural
resources and are widely recorded in folk medicine;
nevertheless, the study of their medicinal value is limited.
Research on the systematic chemical constituents of this genus
is urgently needed. Anti-inflammatory, analgesic, anti-gout,
anti-cancer, and diabetes treatments are critical directions for
future study.
quercetin stimulated insulin secretion (Kittl et al., 2016),
alleviated ferroptosis in pancreatic cells (Li et al., 2020), and
ameliorated diabetic encephalopathy through the SIRT1/ER
stress pathway (Hu et al., 2020). Rutin decreased carbohydrate
absorption from the small intestine, inhibited tissue
gluconeogenesis, increased tissue glucose uptake, stimulated
insulin secretion from beta cells, and protected pancreatic
islets against degeneration (Ghorbani, 2017). Chlorogenic acid
prevented diabetic nephropathy (Bao et al., 2018), rescued
sensorineural auditory function, attenuated insulin resistance,
and modulated glucose uptake (Hong et al., 2017).
In summary, many anti-diabetic ingredients are found in
Porana plants, including coumarins, quinic acid derivatives, and
flavonoids. The content of coumarins and quinic acid derivatives
is relatively high in the genus Porana, suggesting that this genus
could be used to treat diabetes. The network analysis shows that
the pathways regulated by the chemical components of Porana
plants play an essential role in diabetes treatment. For example,
the PI3K/Akt pathway damaged in various body tissues leads to
obesity and type 2 diabetes as the result of insulin resistance; in
turn, insulin resistance exacerbates the PI3K/Akt pathway,
forming a vicious circle (Huang et al., 2018). The progression
of diabetes and its complications can be prevented or treated by
modulating HIF-1 expression or activity (Catrina and Zheng,
2021). However, apart from the pharmacological or clinical
studies of these compounds, there are no reports on the
application of Porana plants in diabetes treatment; relevant
research needs to be performed.
5.3.5 Other activities
Alkorashy et al. (2020) used transcriptomic methods to study
the effect of scopoletin (compound 15) on the phagocytosis of
stimulated U937-derived macrophages. Scopoletin enhanced the
phagocytic activity, involving the downregulation of seven genes
(CDC42, FCGR1A/FCGR1C, ITGA9, ITGB3, PLCE1, RHOD, and
RND3) and upregulation of five genes (DIRAS3, ITGA1, PIK3CA,
PIK3R3, and PLCD1). These results provide a basis for applying
scopoletin in treating cancer progression and metastasis,
autoimmune disorders, pelvic organ prolapse, and cystic
fibrosis. ITGB3 is upregulated in pelvic organ prolapse
disorders in women, and the downregulation of these genes
supports the folk medicinal application of P. spectabilis in the
treatment of uterine prolapse. Scopoletin also acts as an antifungal phytocompound against a multidrug-resistant strain of
Candida tropicalis, with properties affecting planktonic and
biofilm forms of this pathogen (Lemos et al., 2020).
6 Conclusion
The genus Porana is abundant in natural resources and is widely
distributed in Asia, Africa, Oceania, America, and other regions. In
China and India, this genus has several medicinal records. Currently,
Frontiers in Pharmacology
20
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Peng et al.
10.3389/fphar.2022.998965
Author contributions
Conflict of interest
YP and YL: original and final drafting, editing, revision, and
figure editing; YY, YG, HR, JH, and WL: figures, tables and
review of the literature; XC: network analysis; HT and ZC: revised
the draft and final editing.
The authors declare that the research was conducted in the
absence of any commercial or financial relationships that could
be construed as a potential conflict of interest.
Publisher’s note
Funding
All claims expressed in this article are solely those of the authors
and do not necessarily represent those of their affiliated organizations,
or those of the publisher, the editors and the reviewers. Any product
that may be evaluated in this article, or claim that may be made by its
manufacturer, is not guaranteed or endorsed by the publisher.
This work was financially supported by the National
Natural Science Foundation of China [grant numbers
81973419]; Key Research and Development Program of
Shaanxi [grant number 2019ZDLSF04-07, 2022SF-315];
Shaanxi Administration of Traditional Chinese Medicine
Projects [grant number 2022-SLRH-YQ-003, 2021-PY-003].
Supplementary material
Acknowledgments
The Supplementary Material for this article can be found
online at: https://www.frontiersin.org/articles/10.3389/fphar.
2022.998965/full#supplementary-material
Thanks for all institutions that provided the funding.
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