Identification of Bioactive Compounds and Potential Mechanisms of Kuntai Capsule in the Treatment of Polycystic Ovary Syndrome by Integrating Network Pharmacology and Bioinformatics

Li, Xiushen; Ma, Jingxin; Guo, Li; Dong, Chenle; Zhu, Guli; Hong, Wenli; Chen, Can; Wang, Hao; Wu, Xueqing

doi:https://doi.org/10.1155/2022/3145938

Oxidative Medicine and Cellular Longevity

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Abstract Introduction Materials and Methods Results Discussion Conclusion Abbreviations Data Availability Ethical Approval Conflicts of Interest Authors’ Contributions Acknowledgments Supplementary Materials References Copyright Related Articles

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Redox Status, Inflammation, and Immunity in Metabolic Disorders and Chronic Autoimmune Inflammatory Diseases

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Research Article | Open Access

Volume 2022 | Article ID 3145938 | https://doi.org/10.1155/2022/3145938

Identification of Bioactive Compounds and Potential Mechanisms of Kuntai Capsule in the Treatment of Polycystic Ovary Syndrome by Integrating Network Pharmacology and Bioinformatics

Xiushen Li,^1,2,3Jingxin Ma,⁴Li Guo,⁵Chenle Dong,¹Guli Zhu,¹Wenli Hong,¹Can Chen,¹Hao Wang,^1,2,3and Xueqing Wu^1,2,6

Academic Editor: Katarzyna G bczak

Received24 Feb 2022

Accepted30 Mar 2022

Published28 Apr 2022

Abstract

Context. Kuntai capsule (KTC), a proprietary Chinese medicine, have been used for the treatment of polycystic ovary syndrome (PCOS). Objective. This study elucidates the potential therapeutic targets and molecular mechanisms of KTC in the treatment of PCOS. Materials and Methods. Using the Traditional Chinese Medicine System Pharmacology Database and Analysis Platform (TCMSP), the active ingredients and potential targets of KTC were obtained. The Gene Expression Omnibus (GEO) database was used to find differentially expressed genes (DEGs) related to PCOS. Search the CTD, DisGeNet, genecards, NCBI, OMIM, and PharmGKB databases for therapeutic targets related to PCOS. The intersection of potential targets, DEGs, and therapeutic targets was submitted to perform bioinformatics analysis by R language. Finally, the analyses’ core targets and their corresponding active ingredients were molecularly docked. Results. 88 potential therapeutic targets of KTC for PCOS were discovered by intersecting the potential targets, DEGs, and therapeutic targets. According to bioinformatics analysis, the mechanisms of KTC treatment for PCOS could be linked to IL-17 signaling route, p53 signaling pathway, HIF-1 signaling pathway, etc. The minimal binding energies of the 5 core targets and their corresponding ingredients were all less than -6.5. Further research found that quercetin may replace KTC in the treatment of PCOS. Discussion and Conclusions. We explored the active ingredients and molecular mechanisms of KTC in the treatment of PCOS and found that quercetin may be the core ingredient of KTC in the treatment of PCOS.

1. Introduction

Polycystic ovary syndrome (PCOS) is one of the most common endocrine and metabolic diseases in gynecology. The main symptom of PCOS is excessive androgen, which also affects ovarian function and causes infertility [1]. At present, the cause of PCOS is still unclear, but recent studies have shown that the predisposing factors of PCOS may be related to the patients’ daily life style and psychological factors [2]. Oral contraceptives, antiandrogens, and other hormonal interventional drugs are the clinically recognized therapy options [3, 4]. The efficacy and safety drugs for PCOS, on the other hand, have yet to be discovered.

In recent years, the curative effect of many classic prescriptions of traditional Chinese medicine (TCM) in the treatment of PCOS has been recognized by more and more people [5]. According to Chinese medicine theory, one of the core pathogenic processes of PCOS is kidney shortage and blood stasis [6]. Kuntai Capsule (KTC) nourishes the kidneys and also improves blood circulation, which helps to regulate estrogen levels and promote ovarian function (Zhang H et al. [7]). The mechanisms of KTC in the treatment of PCOS may be related to increasing the patient’s sensitivity to insulin, inhibiting oocyte apoptosis, and improving impaired ovarian function, according to the literature (Zhang J et al. [8]; Zhang B et al. [9, 10]). However, the specific mechanisms of KTC in the therapy of PCOS remains unknown.

As one of the cutting-edge methods to explore the mechanisms of drug therapy, network pharmacology has achieved remarkable results in exploring the therapeutic mechanisms of TCM prescriptions and screening the active ingredients and therapeutic targets of TCM ([11]; Gao X et al. [12]). Therefore, we used network pharmacology, bioinformatics, molecular docking, and other methods to reveal the active ingredients, targets, and molecular mechanisms of KTC in the treatment of PCOS. The flow chart of the entire study is shown in Figure 1.

2. Materials and Methods

2.1. Screen the Active Ingredients and Targets of KTC

We searched the active ingredients of KTC through the TCMSP database (https://old.tcmsp-e.com/tcmsp.php) based on the conditions of drug-like and [13]. Then, we searched for the targets of the active ingredients through the TCMSP database and converted the target names to the gene names through the uniprot database (https://www.uniprot.org/). Finally, the Cytoscape 3.7.2 software was used to construct the relationship network between the active ingredients and target genes of KTC.

2.2. Collect the Therapeutic Targets of PCOS

The therapeutic targets were attained by searching DisGeNet, genecards, NCBI, OMIM, and PharmGKB with “PCOS” and “polycystic ovary syndrome” as keywords. Then, we converted the target names to the gene names by the uniprot database.

2.3. Screen Targets Related to PCOS

We merged the three PCOS-related datasets (GSE5850, GSE98421, GSE34526) found in the Gene Expression Omnibus (GEO) database and further used the R language “sva” and “limma” packages for batch correction and differentially expressed genes (DEGs) screening and value < 0.05).

2.4. Potential Therapeutic Targets of KTC in the Treatment of PCOS

Therapeutic targets obtained from CTD, DisGeNet, genecards, NCBI, OMIM, and PharmGKB databases were combined with DEGs from the GEO database and screened for targets appearing in at least two databases. These targets were then intersected with KTC therapeutic targets to identify prospective KTC therapeutic targets for PCOS.

2.5. The Analysis of PPInetwork, GO, and KEGG

We obtained the interactions between potential therapeutic targets of KTC through the STRING database. The protein-protein interaction (PPI) network was constructed by the Cytoscape software, and the core therapeutic targets were further screened according to the degree value. To investigate the probable molecular mechanisms of KTC in the treatment of PCOS, R language was used to perform Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis.

2.6. Molecular Docking

Firstly, identify the active ingredients that correlate to KTC’s core targets in the treatment of PCOS. The active ingredient’s two-dimensional structure was retrieved via the PubChem website and translated into the three-dimensional structure with the lowest free energy by using the ChemBio3D software. Then, the 3D structure of the core target was obtained through the PDB database, and the water molecules and small molecule ligands were deleted through the “PyMOL” software. Next, the “AutoDockTools” software was used to convert the protein and drug ingredient into PDBQT format files and identify active pockets. Finally, we used the “vina” software for molecular docking.

2.7. Identify the Core Ingredients of KTC

We intersected the therapeutic targets of all active ingredients in KTC with the therapeutic targets of KTC. The active ingredient with the most overlapping targets was considered to be the core ingredient of KTC. Further bioinformatics analysis of the potential therapeutic targets of the core ingredients was performed.

3. Results

3.1. The Active Ingredients and Targets of KTC

According to the screening conditions, 80 active ingredients and 204 therapeutic targets of KTC were obtained through the TCMSP database (Supplementary Table 1 and Supplementary Table 2). After converting target names to gene names, the KTC regulatory network was constructed though the “Cytoscape” software. As shown in Figure 2, the surrounding circles were the active ingredients of KTC, and different colors represented different drugs. The red triangles and blue rectangles represented the active ingredients shared by various TCM and therapeutic targets, respectively. The degree value represented the number of edges connected to the node in the graph. The top three pharmaceutical ingredients in terms of degree value were quercetin, kaempferol, and wogonin.

3.2. Therapeutic Targets for PCOS

We found 988, 2540, 477, 181, and 327 therapeutic targets in the DisGeNet, genecards (relevance score 1), NCBI, OMIM, and PharmGKB databases, respectively, by using keywords “polycystic ovary syndrome” and “PCOS” (supplement table 3).

3.3. Targets Related to PCOS

We utilized the R language "limma" package to detect 315 DEGs after excluding batch effects in three data datasets linked to PCOS (supplement table 3). The red dots on the left represented genes with low expression in PCOS patients, whereas the blue dots on the right represented genes with high expression in PCOS patients (Figure 3(a)). Figure 3(b) shows the expression of the top 20 DEGs ranked high and low in PCOS patients versus healthy individuals.

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(b)

3.4. Potential Therapeutic Targets of KTC

The obtained DEGs from the GEO database were combined with PCOS-related targets from the DisGeNet, genecards, NCBI, OMIM, and PharmGKB databases. Targets that appeared at least twice were screened and intersected with therapeutic targets of KTC, resulting in 88 potential therapeutic targets for PCOS (Figures 4(a) and 4(b); Supplementary Table 4).

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(b)

3.5. Analysis Results of GO, KEGG, and PPI Networks

In order to further explore the mechanisms of KTC in the treatment of PCOS, we performed R language to perform GO and KEGG enrichment analyses of potential therapeutic targets (supplement table 5 ). As shown in Figure 5(a), in terms of biological processes, targets were mostly enriched in reactions with metal ions, lipopolysaccharides, bacteria-derived molecules, nutritional levels, apoptosis, reactive oxygen metabolism, reproductive system, neuronal death, etc. In terms of cell components, targets were mostly enriched in membrane raft, membrane microdomain, membrane region, RNA polymerase II transcription factor complex, nuclear transcription factor complex, and so on. In terms of molecular function, the targets were mostly enriched in the activity of steroid hormone receptors, nuclear receptors, transcription factors, oxidoreductase factors, etc. KEGG enrichment analysis found that the targets were mostly enriched in IL-17 signaling pathway, TNF signaling pathway, p53 signaling pathway, Toll-like receptor signaling pathway, HIF-1 signaling pathway, etc. (Figure 5(b)). Figure 6(a) illustrates the PPI network of potential therapeutic targets. The darker the color, the larger the node area and the higher the degree and importance (Figure 6(a)). The selected core potential therapeutic targetswere shown in Figure 6(b). The R language scripts used in this study were shown in Supplementary Table 9.

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3.6. The Results of Molecular Docking

By analyzing the PPI network, the five targets with the highest degree of MAPK1, MAPK8, TP53, AKT1, and JUN were identified and further searched for their corresponding active ingredients. Then, following the molecular docking steps described in the methods section, we executed the corresponding operations and acquired the molecular docking data for the targets and their corresponding active ingredients (Supplementary Table 6). We found that the binding energies of all molecular docking results were less than -6.5. The docking results for the four compounds with the lowest binding energies are shown in Figure 7.

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3.7. The Core Ingredients of KTC

By intersecting the targets of each active ingredient with the potential therapeutic targets of KTC (supplement table 7), we finally determined that quercetin was the core ingredient of KTC. Quercetin had 71 targets that overlap with the potential therapeutic targets of KTC for PCOS (Figure 8(a)). We performed PPI network analysis on these 71 targets and found that the 5 core targets were almost the same as those of KTC (Figure 8(b)). As shown in Figure 8(c), the repetition rate of the GO and KEGG enrichment analysis results of quercetin and KTC reached 75%, which were IL-17 signaling pathway, TNF signaling pathway, endocrine resistance, p53 signaling pathway, HIF-1 signaling pathway, apoptosis-multiple species, and so on (Figure 8(d); supplement table 8).

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4. Discussion

Many TCM formulations have been used for the clinical treatment of PCOS. KTC targets the pathogenesis of PCOS by invigorating the kidney and promoting blood circulation, regulating the level of estrogen, and improving ovarian function. TCM formulations are difficult to examine at the molecular level due to their multi-ingredient and multitarget features. However, the emergence of network pharmacology has made it possible to systematically research TCM formulations. Therefore, this study relies on network pharmacology and bioinformatics to explore the molecular mechanisms of KTC in the treatment of PCOS.

By intersecting the therapeutic targets of KTC and PCOS in the bioinformatics database, 88 potential therapeutic targets of KTC for PCOS were finally obtained. We used potential therapeutic targets to construct a PPI network and further screened out 5 core targets (MAPK1, MAPK8, TP53, AKT1, and JUN). In mammals, the MAPK family participates in a variety of biological processes in the human body. Currently, the 14 MAPK family members that have been identified played important roles in transforming extracellular stimuli into cellular responses [14]. The cascades of MAPK are involved in many steps in the regulation of ovulation, including the recovery of meiosis and the rupture of follicles. MAPK1 plays a significant role in the mechanisms of insulin resistance and ovulation dysfunction in PCOS patients [15]. MAPK8 affects the progress of PCOS by regulating the autophagy of follicular cells [16]. TP53, a transcription factor, stabilizes and induces the transcription of genes related to cell cycle arrest, apoptosis, and metabolism [17]. TP53 participates in the occurrence and progression of PCOS by inducing the apoptosis of ovarian granulosa cells [18]. JUN belongs to the AP-1 transcription factor family, which causes fibrosis and regulates many core cell biological processes [19]. As an important regulator of ovarian function, AKT participates in multiple biological processes including the activation of primordial follicles and the differentiation of granulosa cells [20]. AKT1 is involved in the proliferation of granular cells and follicle formation. The upregulated AKT1 in PCOS patients may be related to granule cell dysfunction [21].

We performed KEGG enrichment analysis on 88 potential therapeutic targets of KTC for PCOS, and found that molecular mechanisms of KTC’s treatment of PCOS might be related to IL-17 signaling pathway, TNF signaling pathway, p53 signaling pathway, Toll-like receptor, and so on. IL17A, a proinflammatory cytokine, is mainly secreted by T-helper 17 cells. In PCOS patients, IL17A is abundantly expressed. The activation of the IL17A signaling pathway can result in the release of inflammatory mediators such as TNF, IL-6, and IL-1 ([22]; Gao Q et al. [23]). TNF is a cytokine with a wide range of biological activities, including TNF-α and TNF-β secreted by macrophages and T lymphocytes, respectively. As an adipokine of systemic inflammation, TNF-α is highly expressed in obese PCOS patients ([24]; Zhang Q et al. [25]). TNF-α signaling pathway is related to the uptake of glucose in tissues, which may lead to the decline of female fertility [26]. Increased androgen is a common clinical feature of PCOS patients, which can promote the expression of p53 [27]. P53 has previously been linked to cytokines including IL-1, IL-6, and TNF-α. The p53 signaling pathway may be involved in ovarian granulosa cell autophagy and death, which could be linked to PCOS pathophysiology [28]. The expression of Toll-like receptors in PCOS patients is significantly increased, which can lead to a decrease in the rate of available embryos in PCOS patients ([29]; Wang Y et al. [30]). Insulin resistance, the significant pathogenic feature of PCOS, is present in almost 85 percent of patients [31]. Recent studies have found that Toll-like receptors activate the NF-κB signaling pathway, leading to insulin resistance in PCOS patients ([32]; Wang D et al. [33]).

By molecular docking of the 5 core targets and their corresponding drug ingredients, we found that wogonin-TP53, kaempferol-MAPK8, quercetin-TP53, and quercetin-MAPK1 have excellent binding efficiency. Wogonin, a naturally occurring flavonoid compound, has anti-inflammatory, antioxidant, anticancer, and antiviral effects [34]. Wogonin regulates the redox process of chondrocytes and inhibits the biological activity of inflammatory mediators produced by macrophages and lymphocytes [35, 36]. In PCOS patients, endoplasmic reticulum stress induces granulosa cell apoptosis through death receptor 5 [37]. By controlling the process of endoplasmic reticulum stress, kaempferol, a natural flavonol active molecule, improves the survival rate of noncancer cells [38, 39]. The core ingredient of KTC was quercetin which had 71 targets that overlap with the potential therapeutic targets of KTC for PCOS. As one of the potential risk factors of PCOS, oxidative stress damages the insulin resistance, lipid metabolism, and follicular development of PCOS. Quercetin works as an antioxidant by lowering free radical generation, preventing lipid peroxidation, and altering antioxidants [40]. Studies have found that quercetin reduces the body weight, cysts, and ovarian diameter and restores healthy follicle function to alleviate the metabolic disorders of PCOS model rats [41]. Oral quercetin has been shown in clinical studies to successfully reduce adiponectin-mediated insulin resistance and hormone abnormalities in PCOS patients [42].

5. Conclusion

In this study, we uncovered the targets and molecular mechanisms of KTC in the treatment of PCOS and confirmed that quercetin may replace KTC for the treatment of PCOS patients through network pharmacology, bioinformatics, molecular docking, and other methods. These results may provide evidence for the clinical application of KTC in the treatment of PCOS.

Abbreviations

KTC:	Kuntai capsule
PCOS:	Polycystic ovary syndrome
TCMSP:	Traditional Chinese Medicine System Pharmacology Database and Analysis Platform
GEO:	Gene Expression Omnibus
TCM:	Traditional Chinese medicine
GO:	Gene Ontology
KEGG:	Kyoto Encyclopedia of Genes and Genomes
PPI:	Protein-protein interaction.

Data Availability

The data sets used and/or analyzed during the current study are available from the corresponding author on reasonable request.

Ethical Approval

No ethics approval was required in this study. All utilized public data sets were generated by others who had obtained ethical approval.

Conflicts of Interest

The authors declare that they have no conflicts of interest.

Authors’ Contributions

Xiushen Li, Jingxin Ma, and Li Guo collected and analyzed the data. Xiushen Li, Guli Zhu, and Wenli Hong conducted experiments and wrote the manuscript. Jingxin Ma, Chenle Dong, Can Chen, and Li Guo contributed to find references. Xiushen Li, Jingxin Ma, and Li Guo contributed equally, so they are the cofirst authors. Hao Wang and Xueqing Wu are the guarantors of this work. Xiushen Li, Jingxin Ma, and Li Guo contributed equally to this work.

Acknowledgments

This study was supported by the Research fund of National Natural Science Foundation of China (81873822), the Shenzhen Science and Technology Innovation Committee (JCYJ20190808120807379 and JCYJ20210324100004013), the grant of 2019 Guangdong Recruitment Program of Foreign Experts (project name: Long-term effects of obesity on hypothalamic-pituitary-ovarian axis in women and mechanisms study), the Shenzhen Pea-cock Program-Project Development Fund (No. 20210407618B), the Shenzhen University General Hospital (SUGH2018QD042), and the Shenzhen Key Laboratory Foundation (ZDSYS20200811143757022).

Supplementary Materials

Supplementary 1. Supplement Table 1: effective ingredients of KTC.

Supplementary 2. Supplement Table 2: therapeutic targets of effective ingredients.

Supplementary 3. Supplement Table 3: therapeutic targets of PCOS disease database and GEO database.

Supplementary 4. Supplement Table 4: the intersection of KTC’s therapeutic targets and PCOS-related databases.

Supplementary 5. Supplement Table 5: analysis of PPI network, GO, and KEGG of KTC’s potential therapeutic targets.

Supplementary 6. Supplement Table 6: molecular docking results of TP53, MAPK1, MAPK8, JUN, AKT1, and their corresponding effective ingredients.

Supplementary 7. Supplement Table 7: potential therapeutic targets of the active ingredients of KTC.

Supplementary 8. Supplement Table 8: analysis of PPI network, GO, and KEGG of quercetin’s potential therapeutic targets.

Supplementary 9. Supplement Table 9: the R language scripts used in the study.

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Copyright © 2022 Xiushen Li et al. This 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.

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