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Plant-Derived Chinese Medicine Monomers on Ovarian Cancer via the Wnt/β-Catenin Signaling Pathway: Review of Mechanisms and Prospects

Plant-Derived Chinese Medicine Monomers on Ovarian Cancer via the Wnt/β-Catenin Signaling... Hindawi Journal of Oncology Volume 2021, Article ID 6852867, 10 pages https://doi.org/10.1155/2021/6852867 Review Article Plant-Derived Chinese Medicine Monomers on Ovarian Cancer via the Wnt/β-Catenin Signaling Pathway: Review of Mechanisms and Prospects 1 1 1 1,2 2 Jia-Yue Xu , Fang-Yuan Liu , Shao-Xuan Liu , Liang-Zhen Xie , Jia Li , 1 2 Yu-Ting Ma, and Feng-Juan Han Department of Obstetrics and Gynecology, Heilongjiang University of Chinese Medicine, Harbin 150040, China Department of Obstetrics and Gynecology, %e First Affiliated Hospital of Heilongjiang University of Chinese Medicine, Harbin 150040, China Correspondence should be addressed to Feng-Juan Han; hanfengjuan2004@163.com Received 15 August 2021; Revised 3 October 2021; Accepted 22 November 2021; Published 6 December 2021 Academic Editor: Ashok Pandurangan Copyright © 2021 Jia-Yue Xu et al. 0is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Ovarian cancer (OC) is a common malignant tumor of the female reproductive system and has a high morbidity and mortality rate. 0e progression and metastasis of OC are complex and involve multiple signaling pathways. 0e Wnt/β-catenin signaling pathwayiscloselyrelatedtoOC,andthereforeblockingtheactivationoftheWnt/β-cateninsignalingdirectlyorinhibitingrelated genes, and molecular targets is of great value in treating OC. Toxicities such as myelotoxicity, cardiotoxicity, genotoxicity, and vasospasm arethemajorsideeffectsfor commonanticancerdrugsand arewelldocumented.0ere is,therefore,a needtodevelop new, effective, safer, and more affordable anticancer drugs from alternative sources. In recent years, plant-derived Chinese medicine monomers have drawn increasing attention due to their high safety, low toxicity, minimal side effects, and antitumor effects.Plant-derivedChinesemedicinemonomersareeffectiveagainstmultipletargetsandcanregulatethegrowth,proliferation, apoptosis, invasion, and migration of OC as well as reverse drug resistance by regulating the Wnt/β-catenin signaling pathway. In this review, we summarize and provide mechanisms and prospects for the use of plant-derived Chinese medicines for the prevention and treatment of OC. diagnosis [4]. 0e treatment of OC is based chiefly on 1. Introduction surgery, adjuvant postoperative chemotherapy or nonad- Ovarian cancer (OC) is one of the most common gyneco- jacent chemotherapy, molecular-targeted therapy, and other logical malignancies and is a serious threat to women’s lives comprehensive treatments. About 80% of patients can and health. OC is insidious, with no typical symptoms in the achieve complete clinical remission through surgery com- early stage, and most patients present with stage III/IV bined with chemotherapy, but there are still patients who diseaseatthetimeofdiagnosis[1].0erewereabout300,000 cannot accept surgery or the toxic side effects of chemo- new cases of OC worldwide in 2018, accounting for 3.4% of therapy drugs, which leads to limitations in these methods the total number of female malignant tumor cases [2]. [5, 6]. Ovarian cancer mortality has declined since the mid-1970s Toxicities such as myelotoxicity, cardiotoxicity, geno- due to reductions in incidence and improvements in toxicity, pulmonary toxicity, cutaneous toxicity, and vaso- treatment in recent decades [3]. But despite these advances, spasm are the major side effects for common anticancer the survival rate for OC has changed only modestly in recent drugs, such as 5-fluorouracil, doxorubicin, and bleomycin, decades, even in high-resource countries, such as the United and are well documented. 0ere is, therefore, a need to States and Canada, and remains at only 47% five years after develop new, effective, safer, and more affordable anticancer 2 Journal of Oncology various cancers [21]. Cadherin is a calcium-dependent drugs from alternative sources. Recently, plant-derived Chinese medicines, with a broad target range and low side transmembrane glycoprotein that mediates the connections between epithelial cells [22]. E-cadherins can form dimers, effects, have begun to play a major role in treating tumors. Many plant-derived Chinese medicines used for treating andthesezipper-likestructuresarethebasisofcelladhesion. various tumors have beneficial effects, including inhibiting When the expression of E-cadherin is abnormal or the the occurrence and development of cancer and prolonging concentration of Ca2+ decreases, the dimers separate and the survival time of cancer patients. With the deepening of the cell adhesion will decrease [23]. 0e mature E-cadherin molecular biology research on the pathogenesis of OC, structure includes a C-terminal intracellular domain, a various signaling pathways that regulate OC have attracted transmembrane hydrophobic domain, and an N-terminal widespread attention, such as the Wnt/β-catenin, JAK/ extracellular domain [24]. Its C-terminal intracellular do- STAT, PI3K/AKT, and NF-κB signaling pathways [7, 8]. 0e main forms a complex with multiple proteins, including α-catenin, pl20, actin, and β-catenin [25]. 0erefore, use of plant-derived Chinese medicines to target Wnt/ β-cateninsignalingtotreatOChasbeen activelyexploredby E-cadherin can bind β-catenin, fix it on the cell membrane, and inhibit β-catenin from entering the nucleus, thereby many groups, and the purpose of this review was to sum- marize this research and to provide mechanisms and antagonizing the Wnt signaling pathway, whereas loss of prospects for the use of plant-derived Chinese medicines for cadherin-mediated cell adhesion can promote β-catenin the prevention and treatment of OC. signaling [26, 27]. In vivo, the loss of E-cadherin can release β-catenin from its binding to the cell membrane [28, 29], which means that a reduction in the expression of E-cad- 2. The Wnt/β-Catenin Signaling Pathway herin can enhance nuclear β-catenin signaling events in the As one of the chief signaling pathways in most organisms, presence of Wnt. According to the model of canonical Wnt the Wnt/β-catenin signaling pathway is essential for em- signaling, the accumulation of free cytoplasmic β-catenin and its nuclear import are important steps. Within the bryonic development and for adult tissue homeostasis and regeneration [9, 10]. In 1982, Nusse and Varmus discovered nucleus, β-catenin specifically binds to proteins of the TCF/ LEF family of transcription factors that activate the tran- the Wnt gene in mouse breast cancer cells, which was also known as the Int1 gene at the time [11]. Later studies found scription of Wnt target genes [30]. 0us, the loss of E-cadherin can increase LEF/TCF-β-catenin signaling, that the Int1 gene and the Drosophila Wingless gene (Wingless)werehomologousgenes,andfinallytheInt1gene which might be explained by cadherin and LEF/TCF having and the Wingless gene were collectively referred to as the similar binding modes to β-catenin [31]. Wnt gene [12]. Further studies revealed that Wnt proteins In normal mature cells, the Wnt pathway is turned off, control a canonical signaling pathway through the key ef- and thedestruction complex,which is composed of axinand fector ß-catenin. 0us, the pathway is also known as the its tumor suppressor partners APC, GSK-3β, and CK1, is Wnt/β-catenin signaling pathway [13]. formed. 0e destruction complex phosphorylates β-catenin and targets it for proteasomal degradation, thus maintaining 0e Wnt signaling pathway includes the Wnt gene family and Wnt receptor. 0ere are a total of 19 Wnt family low levels of cytoplasmic β-catenin. 0e graphical repre- sentation of these functions is shown in Figure 1(a). members (Wnt1, Wnt2, Wnt3, Wnt4, Wnt5a, etc.) dis- covered so far, and these play critical roles in regulating However, under pathological or other abnormal states, the proliferation, differentiation, growth, and so forth [14, 15]. Wnt signaling pathway can be triggered. Wnt proteins are Depending on its mode of action, Wnt signaling is classified secreted molecules that are acylated by porcupine and then as the canonical Wnt signaling pathway (the Wnt/β-catenin bind to the seven-transmembrane receptor Fzd and lipo- signaling pathway), the Wnt/Ca2+ signaling pathway, or the protein-receptor-related protein (LRP) 5/6, thus activating Wnt/PCP signaling pathway [16]. Among these, canonical the Dsh proteins. Dsh then recruits axin, which inhibits the Wnt/β-catenin signaling is the most important [17] and is formation of the destruction complex, thus allowing the specific focus of this review. β-catenin to accumulate in the cytoplasm and translocate into thenucleus where it binds to TCF/LEF and activates the 0e main members of Wnt/β-catenin signaling include Wnt protein, ubiquitin protein, β-catenin, frizzled (Fzd), transcription of Wnt target genes like c-Myc, cyclin D1, MMP7, MMP9, and so forth, as shown in Figure 1(b). A casein kinase 1 (CK1), glycogen synthase kinase 3β (GSK- 3β), axin, adenomatous polyposis coli (APC), disheveled considerable number of studies have shown that Wnt/ (Dsh), T-cell factor/lymphocyte enhancer factor (TCF/LEF), β-catenin signaling is involved in controlling many cellular and so on [18]. In the canonical Wnt signaling pathway, processes, including proliferation and differentiation, and β-catenin is an important protein with transcriptional thus is involved in the pathology of numerous diseases such regulatory activity in the transduction pathway. 0e amount ascardiacandvasculardisease[32]andcancertonamejusta and phosphorylation state of β-catenin in the cell directly few. determineswhetherthecanonicalWntpathway isturnedon or off [19]. 3. The Wnt/β-Catenin Signaling Pathway in OC As a homophilic adhesive complex to stabilize the cell contact surface, E-cadherin also plays a role in the Wnt A large body of evidence suggests that compared with signaling pathway [20]. Recent evidence indicates that the normal ovarian cells, Wnt pathway component proteins, activity and expression levels of E-cadherin are critical in such as Wnt ligand, Fzd, LRP5/6, and especially nuclear β-catenin Journal of Oncology 3 OFF ON E-cadherin FZD expression LRP 5/6 LRP 5/6 FZD α-catenin P120 β-catenin DSH AXIN β-catenin CK1 β-catenin β-catenin β-catenin β-catenin Target genes TCF/LEF Target genes TCF/LEF transcription (a) (b) Figure 1: 0e Wnt/β-catenin signaling pathway. (a) “Wnt Signaling OFF.” Without Wnt activation, the destruction complex, composed of axin and its tumor suppressor partners APC, GSK-3β, and CK1, is formed. 0e destruction complex phosphorylates β-catenin and targets it for proteasomal degradation, thus maintaining low levels of β-catenin in the cytoplasm. In addition, the E-cadherin structure includes a C-terminal intracellular domain, a transmembrane hydrophobic domain, and an N-terminal extracellular domain. 0e C-terminal in- tracellular domain forms a complex with multiple proteins, including α-catenin, pl20, actin, and β-catenin. E-cadherin can bind β-catenin and fix it on the cell membrane, thus inhibitingβ-catenin from entering the nucleus and antagonizing the Wnt signaling pathway. (b) “Wnt Signaling ON”. Wnt binds to Fzd/LRP5/6 receptors triggering the phosphorylation of Dsh, which is a negative regulator of the destruction complex. Dsh then recruits axin, which inhibits the formation of the destruction complex and allows β-catenin to accumulate in the cytoplasm and translocate into the nucleus where it binds to TCF/LEF and activates the transcription of Wnt target genes. β-catenin protein, are significantly upregulated in OC [33]. extracted from patients with metastatic OC was different 0e Wnt signaling pathway plays an important role in the from that of the primary tumor cells, showing the same gene embryonic development of ovarian tissue and in the pro- characteristics as epithelial-mesenchymal transition (EMT), liferation, differentiation, and malignant transformation of thus confirming that the Wnt/β-catenin pathway is one of ovarian cells [34]. 0e occurrence of OC is closely related to the main signaling pathways involved in EMT. At the same β-catenin in the Wnt pathway. time, the E-cadherin/β-catenin protein complex actively participates in the EMT and mesenchymal to epithelial Existing studies have shown that β-catenin has dual functions. On the one hand, it can be used as a signal transitions [41]. EMT is one of the basic mechanisms in- transduction molecule to mediate the transmission of Wnt volved in organ fibrosis and cancer [42], and cell contact is a signal from the cell membrane to the cytoplasm and nucleus key determinant of EMT. 0e loss of E-cadherin promotes [35, 36]. On the other hand, β-catenin also counteracts the release of β-catenin and thus promotes EMT, while the tumor formation, growth, invasion, and metastasis through expression of E-cadherin can reverse the transformed its alternative function as a cytoskeletal component [37]. In phenotype [43–46], and thus the loss of cell-cell adhesion normal somatic cells, β-catenin, with a rod-shaped super- triggers EMTand is related to diseases involving EMT [41]. coiled structure, forms a complex with E-cadherin at the cell Studies have shown that inhibiting the expression of cell adhesion molecules (such as E-cadherin) and mesenchymal membrane, which plays a role in maintaining the adhesion of homotypic cells and prevents cell movement [38]. Based markers (such as vimentin) is a key process in EMT, while the positive EMTstate (decreased E-cadherin expression) is on this, the Wnt/β-catenin pathway contributes to the oc- currence and development of OC by upregulating the ex- a primary feature of OC and metastasis [47, 48]. pression of β-catenin mRNA, whereas downregulating Barghout et al. [49, 50] found that increasing the activity β-catenin reduces the proliferation activity of OC cells and of β-catenin can induce carboplatin resistance in OC A2780 prevents their migration and invasion. cells, while downregulating the expression of β-catenin 0e mechanism through which the Wnt/β-catenin prevents it from entering the nucleus, which effectively pathway may be involved in regulating the occurrence and increases the sensitivity of OC cells to chemotherapeutic development of OC is mainly related to promoting proto- drugs. Decreasing β-catenin activity can also reverse the oncogene or cell regulatory factor gene transcription and resistance of cancer cells to platinum-based chemothera- peutics. 0erefore, downregulation of β-catenin, MMP7, mediating the expression of antiapoptotic genes [39]. Latifi et al. [40] found that the molecular structure of cells survivin, cyclin, c-Myc, and other proteins in the Wnt/ GSK3β GSK3β β-TrCp APC AXIN APC Wnt 4 Journal of Oncology therapy [73, 74]. A rat model made by subcutaneously β-catenin signaling pathway can reverse EMT, inhibit the proliferation of OC cells, induce apoptosis, and reverse the transplanting HO8910PM OC cells showed that 200μmol/L of HYSA for 24 hours inhibited cell growth and promoted effects of transformation therapy drug resistance. However, the underlying mechanisms for how β-catenin controls the apoptosis in HO8910PM cells [53]. At the same time, they development, proliferation, invasion, and metastasis of OC showed that the expression of β-catenin, MMP7, and sur- remain uncertain. vivin were all downregulated and that the expression of the menin protein was upregulated in OC cells and in rat model 4. Plant-Derived Chinese Medicine tumor tissues. It is therefore suggested that HSYA inhibits thegrowthofOCcellsandpromotestheirapoptosisthrough Monomers on OC via Wnt/ menin overexpression and inhibition of β-catenin expres- β-Catenin Signaling sion, thus inhibiting the activation of the Wnt/β-catenin signaling pathway and reducing the downstream expression Plant-derived Chinese medicine monomers play anticancer of the MMP7 and survivin proteins. effects on regulating the Wnt/β-catenin signaling pathway, thereby inhibiting cell invasion, migration, autophagy, ap- optosis, and cell cycle progression and promoting chemo- 4.3. Emodin. Emodin is a natural anthraquinone derivative therapy sensitivity and reversal of drug resistance. 0e roles that occurs in many widely used Chinese medicinal herbs, of plant-derived Chinese medicine monomers on OC via the such as Rheum palmatum, Polygonum cuspidatum, and Wnt/β-catenin signaling are summarized in Table 1. Polygonum multiflorum [75]. It has various anticancer, antitumor, and anti-inflammatory effects protecting organs 4.1.Resveratrol. Resveratrol is a phenolic substance isolated and tissues, and it is mostly used in basic cancer research or initiallyfromVeratrumgrandiflorumandisrichlypresent in incombinationwithotheranticancertherapies[76].Hu[54] grapes, wine, peanuts, soy, and berries and has been found that the proliferation of A2780 and SKOV3 cells attractingtheattentionofresearchersformanydecades[69]. treated with 20μM emodin was not significantly inhibited, Resveratrol has certain preventive and therapeutic effects but the invasion ability and EMT were significantly weak- against cancer through its antioxidation activity and by ened. 0e epithelial indicators E-cadherin and keratin were regulating metabolism [70, 71], and many studies have significantly increased, the expression of the mesenchymal confirmed that resveratrol can inhibit the proliferation, indicators vimentin, N-cadherin, MMP2, and MMP9 was invasion, and migration of OC cells and induce apoptosis. significantly decreased, and the expression of p-GSK-3β, Wang and Shi [51] used the MTT method and flow β-catenin, and ZEBI related to the EMT pathway was sig- cytometry to assess the effect of resveratrol on OC A2780 nificantlydecreased,suggestingthatemodininhibitsEMTin cells and found that the expression levels of β-catenin and epithelialOCcellsbyregulatingtheWnt/β-cateninsignaling c-Myc mRNAs and proteins were significantly reduced after pathway. treatment with 200μmol/L of resveratrol for 24h. Hou et al. [52]treatedOCSKOV3cellswith20μmol/L,40μmol/L,and 4.4.Oridonin. Oridonin (ORI) is an ent-kaurene tetracyclic 80μmol/L of resveratrol for 24h and found that resveratrol diterpenoid compound isolated from Rabdosia rubescens, could significantly inhibit the proliferation, invasion, and and it has various biological and pharmacological activities, migration of OC SKOV3 cells as well as induce their apo- including antitumor, antimicrobial, and anti-inflammatory ptosis. At the same time, resveratrol also significantly re- effects [77]. In recent years, many in vitro experiments have ducedthemRNAexpressionlevelsofc-Myc,cyclinA,cyclin shown that it has a significant inhibitory effect on more than D1, N-cadherin, and vimentin and the protein expression 20 cancer cell lines [78, 79]. Liu and Guo [55] explored the levelofβ-cateninincells,whilethemRNAexpressionofp21, effect of ORI on the migration and invasion of SKOV3 cells E-cadherin, and GSK-3β was significantly increased in a and found that ORI could significantly inhibit cell viability, concentration-dependent manner. In addition, resveratrol induce apoptosis,and reduce cell migration.0eir study also could effectively inhibit the growth of OC CAOV3 and found that 5μmol/L, 10μmol/L, and 20μmol/L of ORI for OVCAR3 cells and promote their apoptosis at a concen- 24h increased the expression of E-cadherin and decreased tration of 120μM for 48h. 0e expression level of β-catenin the expression of vimentin, β-catenin, c-Myc, and cyclin D1 decreased significantly in both cell types, while the ex- in a dose-dependent manner. 0is suggests that ORI might pression of Wnt2 protein was significantly decreased in inhibit the Wnt/β-catenin signaling pathway and thereby CAOV3 cells but significantly increased in OVCAR3 cells. inhibit the expression of related cytokines. Taken together, these studies demonstrate that resveratrol can inhibit OC through Wnt/β-catenin signaling [71]. 4.5. Schisandrin B. Schisandrin B is extracted from the 4.2. Hydroxysafflor Yellow A. Hydroxysafflor yellow A Chinese medicine Schisandra, and it has pharmacological (HSYA) is among the major bioactive and water-soluble effects such as promoting tumor cell apoptosis, reducing inflammationandtissueedema,improvingmicrocirculation compounds isolated from Carthami flos, the flower of Carthamustinctorius [72]. HSYA has various functions such and antioxidation, and expanding blood vessels [80, 81]. Zeng et al. [56] found that 10μmol/L, 20μmol/L, and as inducing tumor cell apoptosis, interfering with angio- genesis,andreversingdrugresistanceduringtransformation 50μmol/L of schisandrin B for 48h inhibited the Journal of Oncology 5 Table 1: Mechanism of plant-derived Chinese medicine monomers on OC via the Wnt/β-catenin signaling pathway. Plant-derived Chinese Targets Mechanism Refs. medicines c-Myc, cyclin A, cyclin D1, N-cadherin, Inhibiting proliferation, invasion, and migration; Resveratrol vimentin, β-catenin, E-cadherin, p21, [51, 52] inducing apoptosis Wnt3a, GSK-3β Hydroxysafflor yellow A β-Catenin, MMP7, survivin, menin Inhibiting proliferation; inducing apoptosis [53] E-cadherin, keratin, vimentin, N- Emodin cadherin, MMP2, MMP9, p-GSK-3β, Inhibiting invasion; reversal of EMT [54] β-catenin, ZEBI Vimentin, c-Myc, cyclin D1, E-cadherin, Inhibiting proliferation, invasion and migration; Oridonin [55] β-catenin inducing apoptosis Schisandrin B β-Catenin, c-Myc, cyclin D1 Inducing apoptosis; blocking cell cycle progression [56] Apigenin β-Catenin, E-cadherin Inhibiting invasion and migration [57, 58] p-AKT, p-GSK-3β, β-catenin, c-Myc, Camellia sinensis Inhibiting proliferation [59, 60] p-β-catenin Icariin β-Catenin, c-Myc, cyclin D1 Inhibiting proliferation [61] Epigallocatechin-3-gallate β-Catenin, cyclin D1 Inducing apoptosis; blocking cell cycle progression [62] Inhibiting proliferation and migration; inducing Paeonol Bcl-2, Bax, β-catenin, c-Myc [63, 64] apoptosis; blocking cell cycle progression p-GSK3β, β-catenin, E-cadherin, Inhibiting proliferation, invasion, and migration; Tetrandrine [65, 66] N-cadherin, vimentin reversal of EMT Inhibiting proliferation; inducing apoptosis; blocking Proanthocyanidins β-Catenin, cyclin D1, c-Myc cell cycle progression; reversing transformation [67] therapy resistance Inhibiting proliferation, invasion, and migration; Naringin β-Catenin, cyclin D1, c-Myc [68] reversing transformation therapy resistance proliferation of SKOV3 cells in both a time- and dose-de- reduced the viability of OCSLCs compared with the control pendent manner. Schisandrin B can also block cell cycle group. TFS inhibited clonal expansion, and tumor sphere progression and reduce the protein expression levels of formation reduced the cells’ self-renewal capacity and was β-catenin, c-Myc, and cyclin D1. 0ese results suggest that showntodownregulatetheexpressionofp-AKT,p-GSK-3β, schisandrin B may reduce the proliferation of SKOV3 cells β-catenin, and c-Myc proteins while upregulating the and block cell cycle progression by inhibiting the Wnt/ phosphorylation of β-catenin thereby inhibiting the Wnt/ β-catenin signaling pathway. β-catenin signaling pathway. It is therefore suggested that TFS can inhibit thegrowth and proliferation of OCSLCsand reduce their stem-like characteristics through inhibition of 4.6. Apigenin. Apigenin is a flavonoid derived from vege- the Wnt/β-catenin signaling pathway. tables, fruits, tea, and beans [82], and it has some effect on preventing and treating cancer, reducing the toxicity of chemotherapy, and reversing drug resistance [83]. Zhang 4.8. Icariin. Icariin is the principal active ingredient in the et al. [57] found that 30μmol/L of apigenin for 24h could Chinese medicine Epimedium. As a new type of flavonoid effectively inhibit the migration and invasiveness of HO8910 anticancer drug, it has demonstrated significant antitumor OC cells, and it can also downregulate β-catenin and effects [86]. Chen et al. [61] found that 20μg/ml, 40μg/ml, E-cadherin, which are the downstream effectors of the Wnt and60μg/mloficariinfor24hcouldsignificantlyinhibitthe signaling pathway. 0e expression level modulation of genes growthandproliferationofCAOV3OCcells,whileRT-PCR and proteins may therefore be achieved by inhibiting the showed that icariin could reduce β-catenin mRNA tran- Wnt/β-catenin signaling pathway. Indeed, cytological scription (thus inhibiting the transcription of the Wnt analysis, western blotting, and immunofluorescent staining signaling pathway target genes c-Myc and cyclin D1) and Western blot confirmed that the compound could down- all suggest that apigenin induces autophagy-mediated downregulation of β-catenin in treated cells, thereby regulate the protein expression of β-catenin, c-Myc, and inhibiting the Wnt/β-catenin signaling pathway [58]. cyclin D1. 0ese results suggest that icariin can inhibit the proliferation of human CAOV3 cells and that this might be achievedbyinhibitingtheWnt/β-cateninsignalingpathway. 4.7. Tea (Camellia sinensis) Flower Saponins. Tea (Camellia sinensis) flower saponins (TFS) has antiallergic and anti- tumor effects [84, 85]. Chen et al. [59, 60] studied the effects 4.9. Epigallocatechin-3-gallate. Epigallocatechin-3-gallate and mechanisms of TFS on the proliferation and differen- (EGCG) is extracted from green tea and has been shown to have multiple effects on both pathological and physiological tiationofovariancancerstem-likecells(OCSLCs)andfound that doses of 2.5μg/ml, 3.0μg/ml, 3.5μg/ml, and 4.0μg/ml processes in humans [87]. In recent years, a large number of 6 Journal of Oncology against free radical-related diseases [93, 94]. Recent studies studies have confirmed that EGCG has a strong pharma- cological effect on the prevention and treatment of tumors have shown that PCs can inhibit the growth of a variety of tumor cells, promote tumor cell apoptosis, and also an- [88]. Long and Tang [62] studied the effects of EGCG on the proliferation of HO8910 OC cells and Wnt/β-catenin sig- tagonize the toxicity of chemotherapeutics in healthy cells naling pathway-related gene expression in the cells. 0ey achieving good anticancer effects with low toxicity [95]. found that EGCG had a strong antiproliferative effect and Zhangetal.[67]foundthata24htreatmentwith10μg/mlof that 40μg/ml of EGCG the cell cycle of HO8910 cells was PC extracted from the bayberry leaf could inhibit β-catenin, completely blocked. At the same time, EGCG could sig- cyclin D1, and c-Myc protein expression, thereby impeding nificantly reduce the level ofβ-catenin and cyclin D1 mRNA the self-renewal ability of drug-resistant OVCAR3 OC cells, and protein. 0ese results suggest that the mechanism weakening their stem cell characteristics, blocking the cell through which EGCG inhibits the growth of HO8910 OC cycle, and reversing drug resistance. 0e suggested mech- anism for these effects is related to inhibition of the Wnt/ cells may be related to the inhibition of the Wnt/β-catenin signaling pathway. β-catenin signaling pathway. 4.10. Paeonol. Paeonol (PAE) is one of the active compo- 4.13. Naringin. Naringin is a natural flavonoid that mainly nents of Cortex Moutan, which has various anti-inflam- exists in the peel and pulp of grapefruit and lime and has matory,antioxidant,andantitumoreffects[89].Studieshave exhibited antioxidative, anti-inflammatory, and antitumor confirmed that 0.4mmol/L, 0.8mmol/L, and 1.6mmol/L of effects [96, 97]. Naringin can inhibit the proliferation of a PAE for 24h, 48h, and 72h can inhibit the proliferation of variety of tumors, such as cervical cancer [98] and OC [99], A2780 OC cells and promote their apoptosis in a time- and and was shown to inhibit the proliferation of cisplatin re- dose-dependent manner. PAE also has an effect on the sistant OC cells (SKOV3/CDDP) in a dose- and time-de- occurrence and development of OC. Related studies have pendent manner. When combined with cisplatin at 20mol/ found that a certain concentration of PAE can inhibit the L,naringincouldreducetheexpressionofCyclinD1,c-Myc, proliferation of human A2780 OC cells and induce their and β-catenin in SKOV3/CDDP cells and partially reverse apoptosis, block the cells in S phase, and significantly reduce cisplatin resistance. 0e mechanism of this activity may be the expression of β-catenin and c-Myc proteins. 0e results related to the Wnt/β-catenin signaling pathway. In addition, of a scratch test showed that the migration ability of the the combination of naringin with cisplatin might prevent A2780 cells decreased significantly proportionally to the cell cycle progression, thereby inhibiting the proliferation, drug concentration and exposure time. 0ese results con- invasion, and migration of OC cells [68]. firmed that PAE inhibits the Wnt/β-catenin signaling pathway by regulating the expression of related proteins, 5. Conclusions and Future Perspectives thereby inhibiting the growth of A2780 cells and inducing apoptosis [63, 64]. 0e Wnt/β-catenin pathway is an important target for treating OC, and many studies have investigated the po- tential therapeutic effects of antibodies and small molecules 4.11.Tetrandrine. Tetrandrine (TET) is a Chinese medicine that target this pathway, with some currently being tested in isolated from the root of Stephania tetrandra S. Moore, [90]. clinical trials [100]. In recent years, accumulating studies Modern pharmacological studies have found that TET acts have concentrated on the effect of plant-derived Chinese as a calcium channel blocker and has immunosuppressive, monomers in treating OC because of their limited side ef- anti-inflammatory, antioxidative, and anticancer activities fects and better clinical efficacy. 0e current evidence sug- [91]. Wang et al. [65] found that when A2780 OC cells and gests that plant-derived Chinese monomers can act on ES-2 ovarian clear cancer cells were cultured for 48h, their different molecular targets within the Wnt/β-catenin sig- survival rates decreased significantly with increasing TET naling pathway to inhibit the metastasis and proliferation of concentration. For the A2780 cells, 5.0μmol/L of TET OC. inhibited the migration and invasion ability and decreased Plant-derived Chinese monomers play a role in the the levels of MiR-21, p-GSK3β, β-catenin, N-cadherin, and development of new targeted therapies for the prevention vimentin, whereas for ES-2 ovarian clear cancer cells, and treatment of OC, but there are still some limitations to 3.0μmol/L TET could do the same. Meanwhile, the these studies. Although some mechanisms of plant-derived E-cadherin protein expression level was significantly in- Chinese monomers in antitumor therapy have been dis- creased. Similarly, Jiang and Hou [66] also found that TET cussed, the research on plant-derived Chinese monomers’ couldenhance thesensitivityofSKOV3/PTXcellstoPTXby anticancer effects and their ability to reverse transformation inhibitingtheβ-catenin/c-Myc/cyclinD1signalingpathway. therapy resistance are mostly based on experiments in- volving in vitro cultured cells. Regarding the cytotoxicity of 4.12. Proanthocyanidins. Proanthocyanidins (PCs) are plant-derived Chinese monomers, their bioavailability is not commonly found in plants such as metaplasia, grape seeds, very clear, and further in vitro, in vivo, and clinical studies pine bark, and sorghum bark [92]. PCs are internationally are needed. 0e anticancer effect of plant-derived Chinese recognized natural antioxidants with high bioavailability monomers is multitargeted. At present, the most common and low toxicity, and they have been shown to protect problems in research on the antitumor effects of plant- Journal of Oncology 7 [5] W. 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Plant-Derived Chinese Medicine Monomers on Ovarian Cancer via the Wnt/β-Catenin Signaling Pathway: Review of Mechanisms and Prospects

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Abstract

Hindawi Journal of Oncology Volume 2021, Article ID 6852867, 10 pages https://doi.org/10.1155/2021/6852867 Review Article Plant-Derived Chinese Medicine Monomers on Ovarian Cancer via the Wnt/β-Catenin Signaling Pathway: Review of Mechanisms and Prospects 1 1 1 1,2 2 Jia-Yue Xu , Fang-Yuan Liu , Shao-Xuan Liu , Liang-Zhen Xie , Jia Li , 1 2 Yu-Ting Ma, and Feng-Juan Han Department of Obstetrics and Gynecology, Heilongjiang University of Chinese Medicine, Harbin 150040, China Department of Obstetrics and Gynecology, %e First Affiliated Hospital of Heilongjiang University of Chinese Medicine, Harbin 150040, China Correspondence should be addressed to Feng-Juan Han; hanfengjuan2004@163.com Received 15 August 2021; Revised 3 October 2021; Accepted 22 November 2021; Published 6 December 2021 Academic Editor: Ashok Pandurangan Copyright © 2021 Jia-Yue Xu et al. 0is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Ovarian cancer (OC) is a common malignant tumor of the female reproductive system and has a high morbidity and mortality rate. 0e progression and metastasis of OC are complex and involve multiple signaling pathways. 0e Wnt/β-catenin signaling pathwayiscloselyrelatedtoOC,andthereforeblockingtheactivationoftheWnt/β-cateninsignalingdirectlyorinhibitingrelated genes, and molecular targets is of great value in treating OC. Toxicities such as myelotoxicity, cardiotoxicity, genotoxicity, and vasospasm arethemajorsideeffectsfor commonanticancerdrugsand arewelldocumented.0ere is,therefore,a needtodevelop new, effective, safer, and more affordable anticancer drugs from alternative sources. In recent years, plant-derived Chinese medicine monomers have drawn increasing attention due to their high safety, low toxicity, minimal side effects, and antitumor effects.Plant-derivedChinesemedicinemonomersareeffectiveagainstmultipletargetsandcanregulatethegrowth,proliferation, apoptosis, invasion, and migration of OC as well as reverse drug resistance by regulating the Wnt/β-catenin signaling pathway. In this review, we summarize and provide mechanisms and prospects for the use of plant-derived Chinese medicines for the prevention and treatment of OC. diagnosis [4]. 0e treatment of OC is based chiefly on 1. Introduction surgery, adjuvant postoperative chemotherapy or nonad- Ovarian cancer (OC) is one of the most common gyneco- jacent chemotherapy, molecular-targeted therapy, and other logical malignancies and is a serious threat to women’s lives comprehensive treatments. About 80% of patients can and health. OC is insidious, with no typical symptoms in the achieve complete clinical remission through surgery com- early stage, and most patients present with stage III/IV bined with chemotherapy, but there are still patients who diseaseatthetimeofdiagnosis[1].0erewereabout300,000 cannot accept surgery or the toxic side effects of chemo- new cases of OC worldwide in 2018, accounting for 3.4% of therapy drugs, which leads to limitations in these methods the total number of female malignant tumor cases [2]. [5, 6]. Ovarian cancer mortality has declined since the mid-1970s Toxicities such as myelotoxicity, cardiotoxicity, geno- due to reductions in incidence and improvements in toxicity, pulmonary toxicity, cutaneous toxicity, and vaso- treatment in recent decades [3]. But despite these advances, spasm are the major side effects for common anticancer the survival rate for OC has changed only modestly in recent drugs, such as 5-fluorouracil, doxorubicin, and bleomycin, decades, even in high-resource countries, such as the United and are well documented. 0ere is, therefore, a need to States and Canada, and remains at only 47% five years after develop new, effective, safer, and more affordable anticancer 2 Journal of Oncology various cancers [21]. Cadherin is a calcium-dependent drugs from alternative sources. Recently, plant-derived Chinese medicines, with a broad target range and low side transmembrane glycoprotein that mediates the connections between epithelial cells [22]. E-cadherins can form dimers, effects, have begun to play a major role in treating tumors. Many plant-derived Chinese medicines used for treating andthesezipper-likestructuresarethebasisofcelladhesion. various tumors have beneficial effects, including inhibiting When the expression of E-cadherin is abnormal or the the occurrence and development of cancer and prolonging concentration of Ca2+ decreases, the dimers separate and the survival time of cancer patients. With the deepening of the cell adhesion will decrease [23]. 0e mature E-cadherin molecular biology research on the pathogenesis of OC, structure includes a C-terminal intracellular domain, a various signaling pathways that regulate OC have attracted transmembrane hydrophobic domain, and an N-terminal widespread attention, such as the Wnt/β-catenin, JAK/ extracellular domain [24]. Its C-terminal intracellular do- STAT, PI3K/AKT, and NF-κB signaling pathways [7, 8]. 0e main forms a complex with multiple proteins, including α-catenin, pl20, actin, and β-catenin [25]. 0erefore, use of plant-derived Chinese medicines to target Wnt/ β-cateninsignalingtotreatOChasbeen activelyexploredby E-cadherin can bind β-catenin, fix it on the cell membrane, and inhibit β-catenin from entering the nucleus, thereby many groups, and the purpose of this review was to sum- marize this research and to provide mechanisms and antagonizing the Wnt signaling pathway, whereas loss of prospects for the use of plant-derived Chinese medicines for cadherin-mediated cell adhesion can promote β-catenin the prevention and treatment of OC. signaling [26, 27]. In vivo, the loss of E-cadherin can release β-catenin from its binding to the cell membrane [28, 29], which means that a reduction in the expression of E-cad- 2. The Wnt/β-Catenin Signaling Pathway herin can enhance nuclear β-catenin signaling events in the As one of the chief signaling pathways in most organisms, presence of Wnt. According to the model of canonical Wnt the Wnt/β-catenin signaling pathway is essential for em- signaling, the accumulation of free cytoplasmic β-catenin and its nuclear import are important steps. Within the bryonic development and for adult tissue homeostasis and regeneration [9, 10]. In 1982, Nusse and Varmus discovered nucleus, β-catenin specifically binds to proteins of the TCF/ LEF family of transcription factors that activate the tran- the Wnt gene in mouse breast cancer cells, which was also known as the Int1 gene at the time [11]. Later studies found scription of Wnt target genes [30]. 0us, the loss of E-cadherin can increase LEF/TCF-β-catenin signaling, that the Int1 gene and the Drosophila Wingless gene (Wingless)werehomologousgenes,andfinallytheInt1gene which might be explained by cadherin and LEF/TCF having and the Wingless gene were collectively referred to as the similar binding modes to β-catenin [31]. Wnt gene [12]. Further studies revealed that Wnt proteins In normal mature cells, the Wnt pathway is turned off, control a canonical signaling pathway through the key ef- and thedestruction complex,which is composed of axinand fector ß-catenin. 0us, the pathway is also known as the its tumor suppressor partners APC, GSK-3β, and CK1, is Wnt/β-catenin signaling pathway [13]. formed. 0e destruction complex phosphorylates β-catenin and targets it for proteasomal degradation, thus maintaining 0e Wnt signaling pathway includes the Wnt gene family and Wnt receptor. 0ere are a total of 19 Wnt family low levels of cytoplasmic β-catenin. 0e graphical repre- sentation of these functions is shown in Figure 1(a). members (Wnt1, Wnt2, Wnt3, Wnt4, Wnt5a, etc.) dis- covered so far, and these play critical roles in regulating However, under pathological or other abnormal states, the proliferation, differentiation, growth, and so forth [14, 15]. Wnt signaling pathway can be triggered. Wnt proteins are Depending on its mode of action, Wnt signaling is classified secreted molecules that are acylated by porcupine and then as the canonical Wnt signaling pathway (the Wnt/β-catenin bind to the seven-transmembrane receptor Fzd and lipo- signaling pathway), the Wnt/Ca2+ signaling pathway, or the protein-receptor-related protein (LRP) 5/6, thus activating Wnt/PCP signaling pathway [16]. Among these, canonical the Dsh proteins. Dsh then recruits axin, which inhibits the Wnt/β-catenin signaling is the most important [17] and is formation of the destruction complex, thus allowing the specific focus of this review. β-catenin to accumulate in the cytoplasm and translocate into thenucleus where it binds to TCF/LEF and activates the 0e main members of Wnt/β-catenin signaling include Wnt protein, ubiquitin protein, β-catenin, frizzled (Fzd), transcription of Wnt target genes like c-Myc, cyclin D1, MMP7, MMP9, and so forth, as shown in Figure 1(b). A casein kinase 1 (CK1), glycogen synthase kinase 3β (GSK- 3β), axin, adenomatous polyposis coli (APC), disheveled considerable number of studies have shown that Wnt/ (Dsh), T-cell factor/lymphocyte enhancer factor (TCF/LEF), β-catenin signaling is involved in controlling many cellular and so on [18]. In the canonical Wnt signaling pathway, processes, including proliferation and differentiation, and β-catenin is an important protein with transcriptional thus is involved in the pathology of numerous diseases such regulatory activity in the transduction pathway. 0e amount ascardiacandvasculardisease[32]andcancertonamejusta and phosphorylation state of β-catenin in the cell directly few. determineswhetherthecanonicalWntpathway isturnedon or off [19]. 3. The Wnt/β-Catenin Signaling Pathway in OC As a homophilic adhesive complex to stabilize the cell contact surface, E-cadherin also plays a role in the Wnt A large body of evidence suggests that compared with signaling pathway [20]. Recent evidence indicates that the normal ovarian cells, Wnt pathway component proteins, activity and expression levels of E-cadherin are critical in such as Wnt ligand, Fzd, LRP5/6, and especially nuclear β-catenin Journal of Oncology 3 OFF ON E-cadherin FZD expression LRP 5/6 LRP 5/6 FZD α-catenin P120 β-catenin DSH AXIN β-catenin CK1 β-catenin β-catenin β-catenin β-catenin Target genes TCF/LEF Target genes TCF/LEF transcription (a) (b) Figure 1: 0e Wnt/β-catenin signaling pathway. (a) “Wnt Signaling OFF.” Without Wnt activation, the destruction complex, composed of axin and its tumor suppressor partners APC, GSK-3β, and CK1, is formed. 0e destruction complex phosphorylates β-catenin and targets it for proteasomal degradation, thus maintaining low levels of β-catenin in the cytoplasm. In addition, the E-cadherin structure includes a C-terminal intracellular domain, a transmembrane hydrophobic domain, and an N-terminal extracellular domain. 0e C-terminal in- tracellular domain forms a complex with multiple proteins, including α-catenin, pl20, actin, and β-catenin. E-cadherin can bind β-catenin and fix it on the cell membrane, thus inhibitingβ-catenin from entering the nucleus and antagonizing the Wnt signaling pathway. (b) “Wnt Signaling ON”. Wnt binds to Fzd/LRP5/6 receptors triggering the phosphorylation of Dsh, which is a negative regulator of the destruction complex. Dsh then recruits axin, which inhibits the formation of the destruction complex and allows β-catenin to accumulate in the cytoplasm and translocate into the nucleus where it binds to TCF/LEF and activates the transcription of Wnt target genes. β-catenin protein, are significantly upregulated in OC [33]. extracted from patients with metastatic OC was different 0e Wnt signaling pathway plays an important role in the from that of the primary tumor cells, showing the same gene embryonic development of ovarian tissue and in the pro- characteristics as epithelial-mesenchymal transition (EMT), liferation, differentiation, and malignant transformation of thus confirming that the Wnt/β-catenin pathway is one of ovarian cells [34]. 0e occurrence of OC is closely related to the main signaling pathways involved in EMT. At the same β-catenin in the Wnt pathway. time, the E-cadherin/β-catenin protein complex actively participates in the EMT and mesenchymal to epithelial Existing studies have shown that β-catenin has dual functions. On the one hand, it can be used as a signal transitions [41]. EMT is one of the basic mechanisms in- transduction molecule to mediate the transmission of Wnt volved in organ fibrosis and cancer [42], and cell contact is a signal from the cell membrane to the cytoplasm and nucleus key determinant of EMT. 0e loss of E-cadherin promotes [35, 36]. On the other hand, β-catenin also counteracts the release of β-catenin and thus promotes EMT, while the tumor formation, growth, invasion, and metastasis through expression of E-cadherin can reverse the transformed its alternative function as a cytoskeletal component [37]. In phenotype [43–46], and thus the loss of cell-cell adhesion normal somatic cells, β-catenin, with a rod-shaped super- triggers EMTand is related to diseases involving EMT [41]. coiled structure, forms a complex with E-cadherin at the cell Studies have shown that inhibiting the expression of cell adhesion molecules (such as E-cadherin) and mesenchymal membrane, which plays a role in maintaining the adhesion of homotypic cells and prevents cell movement [38]. Based markers (such as vimentin) is a key process in EMT, while the positive EMTstate (decreased E-cadherin expression) is on this, the Wnt/β-catenin pathway contributes to the oc- currence and development of OC by upregulating the ex- a primary feature of OC and metastasis [47, 48]. pression of β-catenin mRNA, whereas downregulating Barghout et al. [49, 50] found that increasing the activity β-catenin reduces the proliferation activity of OC cells and of β-catenin can induce carboplatin resistance in OC A2780 prevents their migration and invasion. cells, while downregulating the expression of β-catenin 0e mechanism through which the Wnt/β-catenin prevents it from entering the nucleus, which effectively pathway may be involved in regulating the occurrence and increases the sensitivity of OC cells to chemotherapeutic development of OC is mainly related to promoting proto- drugs. Decreasing β-catenin activity can also reverse the oncogene or cell regulatory factor gene transcription and resistance of cancer cells to platinum-based chemothera- peutics. 0erefore, downregulation of β-catenin, MMP7, mediating the expression of antiapoptotic genes [39]. Latifi et al. [40] found that the molecular structure of cells survivin, cyclin, c-Myc, and other proteins in the Wnt/ GSK3β GSK3β β-TrCp APC AXIN APC Wnt 4 Journal of Oncology therapy [73, 74]. A rat model made by subcutaneously β-catenin signaling pathway can reverse EMT, inhibit the proliferation of OC cells, induce apoptosis, and reverse the transplanting HO8910PM OC cells showed that 200μmol/L of HYSA for 24 hours inhibited cell growth and promoted effects of transformation therapy drug resistance. However, the underlying mechanisms for how β-catenin controls the apoptosis in HO8910PM cells [53]. At the same time, they development, proliferation, invasion, and metastasis of OC showed that the expression of β-catenin, MMP7, and sur- remain uncertain. vivin were all downregulated and that the expression of the menin protein was upregulated in OC cells and in rat model 4. Plant-Derived Chinese Medicine tumor tissues. It is therefore suggested that HSYA inhibits thegrowthofOCcellsandpromotestheirapoptosisthrough Monomers on OC via Wnt/ menin overexpression and inhibition of β-catenin expres- β-Catenin Signaling sion, thus inhibiting the activation of the Wnt/β-catenin signaling pathway and reducing the downstream expression Plant-derived Chinese medicine monomers play anticancer of the MMP7 and survivin proteins. effects on regulating the Wnt/β-catenin signaling pathway, thereby inhibiting cell invasion, migration, autophagy, ap- optosis, and cell cycle progression and promoting chemo- 4.3. Emodin. Emodin is a natural anthraquinone derivative therapy sensitivity and reversal of drug resistance. 0e roles that occurs in many widely used Chinese medicinal herbs, of plant-derived Chinese medicine monomers on OC via the such as Rheum palmatum, Polygonum cuspidatum, and Wnt/β-catenin signaling are summarized in Table 1. Polygonum multiflorum [75]. It has various anticancer, antitumor, and anti-inflammatory effects protecting organs 4.1.Resveratrol. Resveratrol is a phenolic substance isolated and tissues, and it is mostly used in basic cancer research or initiallyfromVeratrumgrandiflorumandisrichlypresent in incombinationwithotheranticancertherapies[76].Hu[54] grapes, wine, peanuts, soy, and berries and has been found that the proliferation of A2780 and SKOV3 cells attractingtheattentionofresearchersformanydecades[69]. treated with 20μM emodin was not significantly inhibited, Resveratrol has certain preventive and therapeutic effects but the invasion ability and EMT were significantly weak- against cancer through its antioxidation activity and by ened. 0e epithelial indicators E-cadherin and keratin were regulating metabolism [70, 71], and many studies have significantly increased, the expression of the mesenchymal confirmed that resveratrol can inhibit the proliferation, indicators vimentin, N-cadherin, MMP2, and MMP9 was invasion, and migration of OC cells and induce apoptosis. significantly decreased, and the expression of p-GSK-3β, Wang and Shi [51] used the MTT method and flow β-catenin, and ZEBI related to the EMT pathway was sig- cytometry to assess the effect of resveratrol on OC A2780 nificantlydecreased,suggestingthatemodininhibitsEMTin cells and found that the expression levels of β-catenin and epithelialOCcellsbyregulatingtheWnt/β-cateninsignaling c-Myc mRNAs and proteins were significantly reduced after pathway. treatment with 200μmol/L of resveratrol for 24h. Hou et al. [52]treatedOCSKOV3cellswith20μmol/L,40μmol/L,and 4.4.Oridonin. Oridonin (ORI) is an ent-kaurene tetracyclic 80μmol/L of resveratrol for 24h and found that resveratrol diterpenoid compound isolated from Rabdosia rubescens, could significantly inhibit the proliferation, invasion, and and it has various biological and pharmacological activities, migration of OC SKOV3 cells as well as induce their apo- including antitumor, antimicrobial, and anti-inflammatory ptosis. At the same time, resveratrol also significantly re- effects [77]. In recent years, many in vitro experiments have ducedthemRNAexpressionlevelsofc-Myc,cyclinA,cyclin shown that it has a significant inhibitory effect on more than D1, N-cadherin, and vimentin and the protein expression 20 cancer cell lines [78, 79]. Liu and Guo [55] explored the levelofβ-cateninincells,whilethemRNAexpressionofp21, effect of ORI on the migration and invasion of SKOV3 cells E-cadherin, and GSK-3β was significantly increased in a and found that ORI could significantly inhibit cell viability, concentration-dependent manner. In addition, resveratrol induce apoptosis,and reduce cell migration.0eir study also could effectively inhibit the growth of OC CAOV3 and found that 5μmol/L, 10μmol/L, and 20μmol/L of ORI for OVCAR3 cells and promote their apoptosis at a concen- 24h increased the expression of E-cadherin and decreased tration of 120μM for 48h. 0e expression level of β-catenin the expression of vimentin, β-catenin, c-Myc, and cyclin D1 decreased significantly in both cell types, while the ex- in a dose-dependent manner. 0is suggests that ORI might pression of Wnt2 protein was significantly decreased in inhibit the Wnt/β-catenin signaling pathway and thereby CAOV3 cells but significantly increased in OVCAR3 cells. inhibit the expression of related cytokines. Taken together, these studies demonstrate that resveratrol can inhibit OC through Wnt/β-catenin signaling [71]. 4.5. Schisandrin B. Schisandrin B is extracted from the 4.2. Hydroxysafflor Yellow A. Hydroxysafflor yellow A Chinese medicine Schisandra, and it has pharmacological (HSYA) is among the major bioactive and water-soluble effects such as promoting tumor cell apoptosis, reducing inflammationandtissueedema,improvingmicrocirculation compounds isolated from Carthami flos, the flower of Carthamustinctorius [72]. HSYA has various functions such and antioxidation, and expanding blood vessels [80, 81]. Zeng et al. [56] found that 10μmol/L, 20μmol/L, and as inducing tumor cell apoptosis, interfering with angio- genesis,andreversingdrugresistanceduringtransformation 50μmol/L of schisandrin B for 48h inhibited the Journal of Oncology 5 Table 1: Mechanism of plant-derived Chinese medicine monomers on OC via the Wnt/β-catenin signaling pathway. Plant-derived Chinese Targets Mechanism Refs. medicines c-Myc, cyclin A, cyclin D1, N-cadherin, Inhibiting proliferation, invasion, and migration; Resveratrol vimentin, β-catenin, E-cadherin, p21, [51, 52] inducing apoptosis Wnt3a, GSK-3β Hydroxysafflor yellow A β-Catenin, MMP7, survivin, menin Inhibiting proliferation; inducing apoptosis [53] E-cadherin, keratin, vimentin, N- Emodin cadherin, MMP2, MMP9, p-GSK-3β, Inhibiting invasion; reversal of EMT [54] β-catenin, ZEBI Vimentin, c-Myc, cyclin D1, E-cadherin, Inhibiting proliferation, invasion and migration; Oridonin [55] β-catenin inducing apoptosis Schisandrin B β-Catenin, c-Myc, cyclin D1 Inducing apoptosis; blocking cell cycle progression [56] Apigenin β-Catenin, E-cadherin Inhibiting invasion and migration [57, 58] p-AKT, p-GSK-3β, β-catenin, c-Myc, Camellia sinensis Inhibiting proliferation [59, 60] p-β-catenin Icariin β-Catenin, c-Myc, cyclin D1 Inhibiting proliferation [61] Epigallocatechin-3-gallate β-Catenin, cyclin D1 Inducing apoptosis; blocking cell cycle progression [62] Inhibiting proliferation and migration; inducing Paeonol Bcl-2, Bax, β-catenin, c-Myc [63, 64] apoptosis; blocking cell cycle progression p-GSK3β, β-catenin, E-cadherin, Inhibiting proliferation, invasion, and migration; Tetrandrine [65, 66] N-cadherin, vimentin reversal of EMT Inhibiting proliferation; inducing apoptosis; blocking Proanthocyanidins β-Catenin, cyclin D1, c-Myc cell cycle progression; reversing transformation [67] therapy resistance Inhibiting proliferation, invasion, and migration; Naringin β-Catenin, cyclin D1, c-Myc [68] reversing transformation therapy resistance proliferation of SKOV3 cells in both a time- and dose-de- reduced the viability of OCSLCs compared with the control pendent manner. Schisandrin B can also block cell cycle group. TFS inhibited clonal expansion, and tumor sphere progression and reduce the protein expression levels of formation reduced the cells’ self-renewal capacity and was β-catenin, c-Myc, and cyclin D1. 0ese results suggest that showntodownregulatetheexpressionofp-AKT,p-GSK-3β, schisandrin B may reduce the proliferation of SKOV3 cells β-catenin, and c-Myc proteins while upregulating the and block cell cycle progression by inhibiting the Wnt/ phosphorylation of β-catenin thereby inhibiting the Wnt/ β-catenin signaling pathway. β-catenin signaling pathway. It is therefore suggested that TFS can inhibit thegrowth and proliferation of OCSLCsand reduce their stem-like characteristics through inhibition of 4.6. Apigenin. Apigenin is a flavonoid derived from vege- the Wnt/β-catenin signaling pathway. tables, fruits, tea, and beans [82], and it has some effect on preventing and treating cancer, reducing the toxicity of chemotherapy, and reversing drug resistance [83]. Zhang 4.8. Icariin. Icariin is the principal active ingredient in the et al. [57] found that 30μmol/L of apigenin for 24h could Chinese medicine Epimedium. As a new type of flavonoid effectively inhibit the migration and invasiveness of HO8910 anticancer drug, it has demonstrated significant antitumor OC cells, and it can also downregulate β-catenin and effects [86]. Chen et al. [61] found that 20μg/ml, 40μg/ml, E-cadherin, which are the downstream effectors of the Wnt and60μg/mloficariinfor24hcouldsignificantlyinhibitthe signaling pathway. 0e expression level modulation of genes growthandproliferationofCAOV3OCcells,whileRT-PCR and proteins may therefore be achieved by inhibiting the showed that icariin could reduce β-catenin mRNA tran- Wnt/β-catenin signaling pathway. Indeed, cytological scription (thus inhibiting the transcription of the Wnt analysis, western blotting, and immunofluorescent staining signaling pathway target genes c-Myc and cyclin D1) and Western blot confirmed that the compound could down- all suggest that apigenin induces autophagy-mediated downregulation of β-catenin in treated cells, thereby regulate the protein expression of β-catenin, c-Myc, and inhibiting the Wnt/β-catenin signaling pathway [58]. cyclin D1. 0ese results suggest that icariin can inhibit the proliferation of human CAOV3 cells and that this might be achievedbyinhibitingtheWnt/β-cateninsignalingpathway. 4.7. Tea (Camellia sinensis) Flower Saponins. Tea (Camellia sinensis) flower saponins (TFS) has antiallergic and anti- tumor effects [84, 85]. Chen et al. [59, 60] studied the effects 4.9. Epigallocatechin-3-gallate. Epigallocatechin-3-gallate and mechanisms of TFS on the proliferation and differen- (EGCG) is extracted from green tea and has been shown to have multiple effects on both pathological and physiological tiationofovariancancerstem-likecells(OCSLCs)andfound that doses of 2.5μg/ml, 3.0μg/ml, 3.5μg/ml, and 4.0μg/ml processes in humans [87]. In recent years, a large number of 6 Journal of Oncology against free radical-related diseases [93, 94]. Recent studies studies have confirmed that EGCG has a strong pharma- cological effect on the prevention and treatment of tumors have shown that PCs can inhibit the growth of a variety of tumor cells, promote tumor cell apoptosis, and also an- [88]. Long and Tang [62] studied the effects of EGCG on the proliferation of HO8910 OC cells and Wnt/β-catenin sig- tagonize the toxicity of chemotherapeutics in healthy cells naling pathway-related gene expression in the cells. 0ey achieving good anticancer effects with low toxicity [95]. found that EGCG had a strong antiproliferative effect and Zhangetal.[67]foundthata24htreatmentwith10μg/mlof that 40μg/ml of EGCG the cell cycle of HO8910 cells was PC extracted from the bayberry leaf could inhibit β-catenin, completely blocked. At the same time, EGCG could sig- cyclin D1, and c-Myc protein expression, thereby impeding nificantly reduce the level ofβ-catenin and cyclin D1 mRNA the self-renewal ability of drug-resistant OVCAR3 OC cells, and protein. 0ese results suggest that the mechanism weakening their stem cell characteristics, blocking the cell through which EGCG inhibits the growth of HO8910 OC cycle, and reversing drug resistance. 0e suggested mech- anism for these effects is related to inhibition of the Wnt/ cells may be related to the inhibition of the Wnt/β-catenin signaling pathway. β-catenin signaling pathway. 4.10. Paeonol. Paeonol (PAE) is one of the active compo- 4.13. Naringin. Naringin is a natural flavonoid that mainly nents of Cortex Moutan, which has various anti-inflam- exists in the peel and pulp of grapefruit and lime and has matory,antioxidant,andantitumoreffects[89].Studieshave exhibited antioxidative, anti-inflammatory, and antitumor confirmed that 0.4mmol/L, 0.8mmol/L, and 1.6mmol/L of effects [96, 97]. Naringin can inhibit the proliferation of a PAE for 24h, 48h, and 72h can inhibit the proliferation of variety of tumors, such as cervical cancer [98] and OC [99], A2780 OC cells and promote their apoptosis in a time- and and was shown to inhibit the proliferation of cisplatin re- dose-dependent manner. PAE also has an effect on the sistant OC cells (SKOV3/CDDP) in a dose- and time-de- occurrence and development of OC. Related studies have pendent manner. When combined with cisplatin at 20mol/ found that a certain concentration of PAE can inhibit the L,naringincouldreducetheexpressionofCyclinD1,c-Myc, proliferation of human A2780 OC cells and induce their and β-catenin in SKOV3/CDDP cells and partially reverse apoptosis, block the cells in S phase, and significantly reduce cisplatin resistance. 0e mechanism of this activity may be the expression of β-catenin and c-Myc proteins. 0e results related to the Wnt/β-catenin signaling pathway. In addition, of a scratch test showed that the migration ability of the the combination of naringin with cisplatin might prevent A2780 cells decreased significantly proportionally to the cell cycle progression, thereby inhibiting the proliferation, drug concentration and exposure time. 0ese results con- invasion, and migration of OC cells [68]. firmed that PAE inhibits the Wnt/β-catenin signaling pathway by regulating the expression of related proteins, 5. Conclusions and Future Perspectives thereby inhibiting the growth of A2780 cells and inducing apoptosis [63, 64]. 0e Wnt/β-catenin pathway is an important target for treating OC, and many studies have investigated the po- tential therapeutic effects of antibodies and small molecules 4.11.Tetrandrine. Tetrandrine (TET) is a Chinese medicine that target this pathway, with some currently being tested in isolated from the root of Stephania tetrandra S. Moore, [90]. clinical trials [100]. In recent years, accumulating studies Modern pharmacological studies have found that TET acts have concentrated on the effect of plant-derived Chinese as a calcium channel blocker and has immunosuppressive, monomers in treating OC because of their limited side ef- anti-inflammatory, antioxidative, and anticancer activities fects and better clinical efficacy. 0e current evidence sug- [91]. Wang et al. [65] found that when A2780 OC cells and gests that plant-derived Chinese monomers can act on ES-2 ovarian clear cancer cells were cultured for 48h, their different molecular targets within the Wnt/β-catenin sig- survival rates decreased significantly with increasing TET naling pathway to inhibit the metastasis and proliferation of concentration. For the A2780 cells, 5.0μmol/L of TET OC. inhibited the migration and invasion ability and decreased Plant-derived Chinese monomers play a role in the the levels of MiR-21, p-GSK3β, β-catenin, N-cadherin, and development of new targeted therapies for the prevention vimentin, whereas for ES-2 ovarian clear cancer cells, and treatment of OC, but there are still some limitations to 3.0μmol/L TET could do the same. Meanwhile, the these studies. Although some mechanisms of plant-derived E-cadherin protein expression level was significantly in- Chinese monomers in antitumor therapy have been dis- creased. Similarly, Jiang and Hou [66] also found that TET cussed, the research on plant-derived Chinese monomers’ couldenhance thesensitivityofSKOV3/PTXcellstoPTXby anticancer effects and their ability to reverse transformation inhibitingtheβ-catenin/c-Myc/cyclinD1signalingpathway. therapy resistance are mostly based on experiments in- volving in vitro cultured cells. Regarding the cytotoxicity of 4.12. Proanthocyanidins. Proanthocyanidins (PCs) are plant-derived Chinese monomers, their bioavailability is not commonly found in plants such as metaplasia, grape seeds, very clear, and further in vitro, in vivo, and clinical studies pine bark, and sorghum bark [92]. PCs are internationally are needed. 0e anticancer effect of plant-derived Chinese recognized natural antioxidants with high bioavailability monomers is multitargeted. At present, the most common and low toxicity, and they have been shown to protect problems in research on the antitumor effects of plant- Journal of Oncology 7 [5] W. 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Journal of OncologyHindawi Publishing Corporation

Published: Dec 6, 2021

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