Systems Pharmacology Dissection of Traditional Chinese Medicine Wen-Dan Decoction for Treatment of Cardiovascular Diseases

Lan, Tao-Hua; Zhang, Lu-Lu; Wang, Yong-Hua; Wu, Huan-Lin; Xu, Dan-Ping

doi:https://doi.org/10.1155/2018/5170854

Evidence-Based Complementary and Alternative Medicine

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Abstract Introduction Methods Results Discussion Conclusion Conflicts of Interest Authors’ Contributions Acknowledgments Supplementary Materials References Copyright Related Articles

Research Article | Open Access

Volume 2018 | Article ID 5170854 | https://doi.org/10.1155/2018/5170854

Systems Pharmacology Dissection of Traditional Chinese Medicine Wen-Dan Decoction for Treatment of Cardiovascular Diseases

Tao-Hua Lan,¹Lu-Lu Zhang,²Yong-Hua Wang,²Huan-Lin Wu,³and Dan-Ping Xu¹

Academic Editor: Carmen Mannucci

Received27 Sept 2017

Accepted04 Apr 2018

Published10 May 2018

Abstract

Cardiovascular diseases (CVDs) have been recognized as first killer of human health. The underlying mechanisms of CVDs are extremely complicated and not fully revealed, leading to a challenge for CVDs treatment in modern medicine. Traditional Chinese medicine (TCM) characterized by multiple compounds and targets has shown its marked effects on CVDs therapy. However, system-level understanding of the molecular mechanisms is still ambiguous. In this study, a system pharmacology approach was developed to reveal the underlying molecular mechanisms of a clinically effective herb formula (Wen-Dan Decoction) in treating CVDs. 127 potential active compounds and their corresponding 283 direct targets were identified in Wen-Dan Decoction. The networks among active compounds, targets, and diseases were built to reveal the pharmacological mechanisms of Wen-Dan Decoction. A “CVDs pathway” consisted of several regulatory modules participating in therapeutic effects of Wen-Dan Decoction in CVDs. All the data demonstrates that Wen-Dan Decoction has multiscale beneficial activity in CVDs treatment, which provides a new way for uncovering the molecular mechanisms and new evidence for clinical application of Wen-Dan Decoction in cardiovascular disease.

1. Introduction

Cardiovascular diseases (CVDs) are the most common cause of death in the world [1]. Every year more than 10 million human lives are lost because of CVDs, and the mortality is predicted to increase to 23.6 million by 2030 [2]. The underlying mechanisms of CVDs are extremely complicated and not fully revealed, leading to a challenge for CVDs treatment in modern medicine. With the progress of modern medicine, various allopathic medicines with significant curative effects have been reported in recent years. However, there are still some medical problems of CVDs not solved satisfactorily with current western allopathic therapy.

Traditional Chinese medicine (TCM) characterized by multiple compounds and targets has shown its marked effects on various human diseases. Successful applications of Chinese herbal have been reported for CVDs prevention and treatment. Wen-Dan Decoction is one of the notable examples. Wen-Dan Decoction is composed of six herbs, including Arum ternatum Thunb, Zingiber officinale Roscoe, Caulis Bambusae in Taenia, Aurantii Fructus Immaturus, Citrus reticulata, and licorice. This decoction has been used to treat CVDs since Tang Dynasty, and the clinical effects have been validated in previous research. Clinical studies show that Wen-Dan Decoction achieved notable success in treating coronary heart disease [3], hypertension [4], arrhythmia [5], and heart failure [6]. Although the effect of Wen-Dan Decoction on CVD is promising, its pharmacological actions have not been fully revealed.

By integrating systems biology and pharmacology, systems pharmacology provides a new approach to reveal the complicated mechanisms of TCM in treating complicated diseases through pharmacokinetic evaluation, target prediction, and network/pathway analysis [7, 8]. Here, we developed a system pharmacology approach to explore the molecular mechanisms of Wen-Dan Decoction in CVDs treatment. First, we built a molecular database for all 6 herbs in Wen-Dan Decoction and used ADME system to screen the active compounds based on the above database. Next, potential targets were predicted and drug-target interactions were further constructed. Then, we constructed the networks to illustrate the molecular mechanisms of Wen-Dan Decoction in CVDs treatment. Finally, pathway integration analysis was performed to uncover CVDs pathway and therapeutic modules of target proteins. We believed that the results will significantly improve our understanding of the underlying mechanisms of Wen-Dan Decoction and provide new evidence for clinical application of Wen-Dan Decoction in cardiovascular disease.

2. Methods

The protocol of the systems pharmacology approach introduced in this work (Figure 1) includes 5 main steps as follows: molecular database construction for all 6 herbs in Wen-Dan Decoction; ADME evaluation to screen the active ingredients from the above compound database; target-fishing to predict the direct targets of the obtained active compounds; network construction and analysis to illustrate the molecular mechanism of Wen-Dan Decoction in treating CVDs; pathway analysis to disclose CVDs pathway and therapeutic modules of target proteins.

2.1. Molecular Database Construction

A total of 140 active compounds of 6 drugs in Wen-Dan Decoction were manually collected from previously developed molecular database: Traditional Chinese Medicine Systems Pharmacology Database (TCMSP) [9].

2.2. ADME Evaluation

An in silico integrative model-ADME (absorption, distribution, metabolism, and excretion of drugs) including PreOB (predicts oral bioavailability) and PreDL (predicts drug-likeness) was used to screen the potential active compounds from Wen-Dan Decoction.

Considering that OB is one of the most crucial pharmacokinetic properties of orally administered drugs which has been proven to be efficient in the drug delivery to the systemic circulation, we introduced a robust in-house model OBioavail1.1 [10] to predict the OB value for drugs. The compounds with OB ≥30% were screened out for further analysis.

Considering that DL of molecules is one of the important factors in the ADME of human body, a PreDL model was developed to calculate the DL values of each active compound through evaluating the Tanimoto similarity [11] between compounds and chemicals in the Drugbank Database [12]. The compounds with DL ≥0.18 were screened out for further analysis.

2.3. Target-Fishing

Drug-targeting was firstly implemented by TCMSP Database and then an in-house model on the basis of ligand-target chemical genomics was introduced to enlarge the target library and increase the accuracy. We used Sys DT model which was developed on the basis of Random Forest (RF) and Support Vector Machine (SVM) algorithm to predict the target from potential active molecules of drugs. Only the targets with and were reserved for further analysis.

To further explore functional annotation of the targets, a Gene Ontology Biological Process (GOBP) enrichment was performed through linking targets to DAVID [13] for classification. Only the terms with value less than 0.05 were selected.

2.4. Network Construction

2.4.1. Compound-Target (C-T) Network

In this section, a compound-target network was built to illustrate drug-target interactions of all active compounds in Wen-Dan Decoction and their potential targets. In this network, compounds are linked with their targeted proteins.

2.4.2. Target-Disease (T-D) Network

To comprehensively understand the interrelationship between potential targets and diseases, a target-disease network linking target proteins with their relevant diseases and a target-CVDs (T-cD) network linking specific targets with CVDs were built by Cytoscape 2.8.1 [14], and the quantitative property “degree” of these networks was analyzed by Network Analysis plugin and CentiScaPe 1.2 of Cytoscape [15].

2.4.3. Target-Pathway (T-P) Network

A Target-Pathway network is constructed by mapping the target proteins to the KEGG pathway database. The bipartite graphs were constructed by Cytoscape version 2.8.3. The compounds, targets, and pathways are represented by nodes, and the interaction between two nodes is represented by an edge. Node size is proportional to its degree.

2.4.4. Pathway Constructions and Analysis

To explore the modulating specific pathways and the therapeutic feature of the active compounds on CVD treatment, pathways related to CVDs were picked out and assembled into a “CVDs pathway and therapeutic modules” under the pathological and clinical data.

3. Results

3.1. Active Compounds Identification

A total of 801 compounds were collected from the six herbs of Wen-Dan Decoction. As a result, 140 active compounds with OB ≥ 30% and DL ≥ 0.18 were obtained and 127 of 140 active compounds with drug targets were selected for further analysis (as displayed in Table S1). The top 5 molecules in degree ranking were presented in Table 1.

As shown in Table S1, there are 6 active compounds shared by two or more herbs of Wen-Dan Decoction. For instance, beta-sitosterol, a common ingredient of Arum ternatum Thunb and Zingiber officinale Roscoe, has inhibitory effects on the expression of VCAM-1 and ICAM-1, which promote atherosclerosis by regulating the chronic inflammatory process [16]. Stigmasterol, in Arum ternatum Thunb and Zingiber officinale Roscoe, has been found effective in inhibiting Ang II-stimulated vascular smooth muscle proliferation, in association with ROS reduction, SOD and CAT enhancement, and increase of p53 protein [17].

3.2. Drug-Targeting and Functional Analysis

2239 compound-target interactions were built between 127 compounds and 283 targets. The results showed that mostly compounds act on more than one target, and different compounds can have the same target. For instance, cavidine from Arum ternatum Thunb, stigmasterol, and beta-sitosterol from Arum ternatum Thunb and Zingiber officinale Roscoe, 6-methoxyaurapten from Aurantii Fructus, and medicarpin from licorice can interact with the same target CHRM3. Luteolin from Aurantii Fructus and quercetin from licorice can interact with the same target CDKN1A, which has effects on treatment of gastritis. Stigmasterol, beta-sitosterol, and coniferin from Arum ternatum Thunb and Zingiber officinale Roscoe and isosinensetin and sinensetin from Aurantii Fructus can interact with the same target ADRB2, which has effects on treatment of asthma.

In the subsequent GOBP enrichment analysis, we listed the top 20 significantly enriched GO terms (as displayed in Figure 2); the results showed that most of these targets are strongly correlated to inflammatory response, hormonal balance, and homeostasis, including response to drug, regulation of cell proliferation, blood vessel development, and multicellular organismal homeostasis.

3.3. Network Construction and Analysis

3.3.1. Compound-Target (C-T) Network and Analysis

As shown in Figure 3, a compound-target interaction was generated based on 410 nodes (127 potential compounds and 283 potential targets) and 2239 edges. The average degree number of targets per compound is 18.055. The top 5 molecules and the top 5 targets in degree ranking were presented in Tables 1 and 2, respectively. Among those active compounds, MOL127 exhibits the highest degree (degree = 152), followed by MOL053 (degree = 63), MOL033 (degree = 56), and MOL050 (degree = 43), which indicated the multitarget properties of compounds. Among the candidate targets, ESR1 shows the highest degree (Degree = 141), followed by PGHS2 (degree = 103), CaM (degree = 86), and HSP90A (degree = 79), which demonstrated the potential therapeutic effect of Wen-Dan Decoction.

3.3.2. Target-Disease (T-D) Network and Analysis

To comprehensively understand the interrelationship between potential targets and diseases, a target-disease interaction was built as shown in Figure 4. The results showed that multitargets are interrelated to the same diseases. For example, CDKN1A, IL1B, and TP53 are associated with gastritis; MPP1, MPP3, MPP9, PLAT, and SERPINE1 are associated with gastric ulcer; ADRA2A, SLC6A2, and SLC6A4 are associated with gastrointestinal disease. HTR2C, CYP1B1, CYP19A1, ESR1, ESR2, PDR, and AR are found to be interrelated to hormonal disorders; ABCC1, NQO1, TIMP1, ADRB2, and ALOX5 are associated with asthma. The results also revealed that multidiseases have the same target. For example, MPP3 and MPP9 are associated not only with gastric ulcer, but also with COPD, preeclampsia, and coronary artery diseases. SLC6A2 and SLC6A4 are associated not only with gastrointestinal disease, but also with anorexia nervosa, acute anxiety, and autism.

To illustrate the interrelationship between specific targets and their correlated CVDs, a target-CVDs (T-cD) network was built as shown in Figure 5. The results showed that most targets related to more than one CVDs-associated disease and the shared targets might be the potential therapeutic targets in the treatment of CVDs. For example, NOS3, which plays an important role in regulation of nitric oxide production [18], is associated with coronary artery disease, myocardial infarct, congestive heart failure, stroke, and hypertension. As one of the highest incidences of CVDs, coronary artery disease links with more than 20 targets in this T-cD network, such as VCAM1 and ICAM1 (reported to increase in dysfunctional endothelial cells [19]), MMP9, MMP3, and MMP2 (being influencing factors in cardiac fibrosis [20]). Interleukin family was also predicted to be related to coronary artery disease, including IL 6, IL4, IL10, IL1A, and IL1B. All the results revealed the multitarget therapeutic efficiency of Wen-Dan Decoction in CVDs treatment.

3.3.3. Target-Pathway (T-P) Network and Analysis

As shown in Table 3, 92 targets are mapped to 51 pathways. A Target-Pathway interaction was built based on 143 nodes (92 potential targets and 51 potential pathways) and 324 edges (as shown in Figure 6). The results showed an average degree of 3.54 per target and 5.45 per pathway. Several target proteins (19/92) are mapped to more than 5 pathways, demonstrating that these targets may intercede the interactions between different pathways. The results also showed that the targets of Wen-Dan Decoction are mainly involved in the biological process of cancer, apoptosis, cell cycle, and so on. In addition, the main pathways coregulated by multiple targets, such as Ca²⁺ signal pathway and arachidonic acid metabolism pathway, have been validated as common pathways in the treatment of cardiovascular disease and stomach illness.

3.3.4. Pathway Constructions and Analysis

In this section, a “CVDs pathway” was conducted based on the present cognition of CVDs pathology. As shown in Figure 7, this CVDs-associated pathway can be separated into two representative therapeutic modules (calcium signal pathway and vascular smooth muscle contraction), which reveal the underlying therapeutic effects of Wen-Dan Decoction.

Hypertension is one of independent risk factors for CVDs. The sustained high blood pressure may lead to the impairment of target organs, such as heart and kidney. Therefore, the therapies that can control blood pressure within the normal range are beneficial in the treatment of CVDs. As shown in Figure 7, therapeutic modules through the regulation of vascular smooth muscle contraction and calcium signal pathway are involved in the blood pressure regulation of Wen-Dan Decoction. For instance, norepinephrine signaling operates the function of vascular smooth muscle contraction through the regulation of some certain active compounds on their corresponding target proteins, including ADRA1, PKC, Raf, and ERK. Neurotransmitter GPCR and its downstream signal pathway are involved in the regulation of CAMK activity, which may cause cardiac hypertrophy and myocardial dysfunction [21]. All the results indicated that the blood pressure associate pathway is a potent therapeutic target of Wen-Dan Decoction in CVDs treatment.

4. Discussion

Cardiovascular disease remains the leading cause of human death around the world [22]. There are still some medical problems of CVDs not solved satisfactorily with current western allopathic therapy. The world is calling for a more efficient curative system. TCM is attracting more and more attention across the world for its marked effects in clinical practice. Wen-Dan Decoction, a clinically effective herb formula, has been used to treat CVDs specially accompanied by symptoms such as angina and arrhythmia. There is growing evidence showing that herbs and their active compounds in this decoction have biological effects on CVDs. For instance, Wen-Dan Decoction has been proven to regulate the disorder of lipid metabolism by raising the activity of total lipase (LA) and lipoprotein lipase (LPL) in the modal rats [23]. The elements of Wen-Dan Decoction and their active compounds, such as ginger [24, 25], Caulis Bambusae in Taenia [26], and licorice [27], also have been reported to attenuate the development of atherosclerotic lesions associated with a significant antihyperlipidemic effect. Besides, Wen-Dan Decoction can reverse hypertensive myocardial fibrosis and significantly reduce Ang II, ALDO in myocardial tissue, and plasma of SHR rats. The underlying mechanism may be related to the inhibition of the expression of TGF-beta 1, IGF 1, JNK, p38MAPK, and ERK5 in myocardial tissue [28, 29]. Citrus Reticulata and licorice exert cardioprotection by oxidative stress reduction, endogenous antioxidants augment, and structural integrity maintenance [30, 31]. However, the underlying mechanisms of action on the protein and pathway level are still unrevealed. Therefore, in this study, we developed a systems pharmacology approach to explore the mechanisms of Wen-Dan Decoction in CVDs treatment from a molecule to system level.

Previous studies suggested that TCM therapy has better influence on the complicated balance of whole cellular networks due to acting on multiple targets. The success examples of multitarget and combinatorial therapies indicated that systematic drug-design strategies should be directed against multiple targets [32]. In our work, a total of 801 compounds were collected from the six herbs of Wen-Dan Decoction. There are 6 active compounds shared by two or more herbs. 127 potential active compounds and their corresponding 283 direct targets were identified by ADME screening, demonstrating a multidrug-multitarget paradigm of Wen-Dan Decoction. Then, TCMSP Database and an in-house model on the basis of ligand-target chemical genomics were applied to conduct the drug-target interactions followed by GOBP analysis. 2239 compound-target interactions were found between 127 compounds and 283 targets. The analytical results distinctly revealed the action mode and biological processes that drugs utilized to achieve their curative effects. Finally, the networks were built for analysis to illustrate the molecular mechanism of Wen-Dan Decoction in CVDs treatment, and pathway analysis was performed to further dissect the therapeutic polypharmacology of Wen-Dan Decoction.

The underlying mechanisms of CVDs are extremely complicated and not fully revealed. We can tell from the results of this work that with multidrug-target-disease interactions active compounds of Wen-Dan Decoction achieve the curative results on CVDs treatment by regulating multiple targets and pathways. Since modern medicine is unable to prevent the medical failures and some ill-effects in CVDs treatment, TCM seems to be an alternative choice which shows great potential in confronting complex diseases.

5. Conclusion

In the present study, a systems pharmacology approach was developed by integrating the ADME screening, targets prediction, network, and pathway analysis to uncover the underlying mechanisms of Wen-Dan Decoction. Our results showed the following:

(1) 127 potential active compounds and their corresponding 283 direct targets were identified in Wen-Dan Decoction, demonstrating a multidrug-multitarget paradigm.

(2) In drug-targeting and functional analysis, 2239 compound-target interactions were found between 127 compounds and 283 targets, indicating that most compounds of Wen-Dan Decoction act on more than one target, and different compounds can have the same target.

(3) In network analysis, the C-T network indicated the multitarget properties of compounds, being the essence of the action mode of Wen-Dan Decoction. The T-D network showed that multitargets are interrelated to the same diseases and also revealed that multidiseases have the same target. The T-P network and CVDs pathway displayed that targets of Wen-Dan Decoction may intercede the interactions between different pathways, which further demonstrated the two therapeutic modules of Wen-Dan Decoction in CVDs treatment: calcium signal pathway and vascular smooth muscle contraction.

(4) This work provides a new approach for understanding the underlying mechanisms of Wen-Dan Decoction and new evidence for clinical application of Wen-Dan Decoction in cardiovascular disease.

Conflicts of Interest

The authors declare no conflicts of interest.

Authors’ Contributions

Yong-Hua Wang and Huan-Lin Wu contributed to conception and design. Tao-Hua Lan, Dan-Ping Xu, and Lu-Lu Zhang contributed to the conduct of the study and acquisition and analysis of data. Tao-Hua Lan and Dan-Ping Xu contributed to manuscript preparation. Huan-Lin Wu contributed to critical revising of the manuscript.

Acknowledgments

The present work was supported by National Natural Science Foundation of China (Grant nos. 81774219, 81403341, and 81202815), Key Project of Guangdong Branch Institute of China Academy of Traditional Chinese Medicine (no. ZZ0908065), Guangzhou Science and Technology Plan Project (no. 201710010107), and Guangdong Provincial Science and Technology Plan (no. 2016A020226011).

Supplementary Materials

Table S1: chemical information of the 127 active compounds which were collected from the six herbs of Wen-Dan Decoction, such as molecule name, OB(%), BBB, Caco-2, DL, degree, structure, and herb name. (Supplementary Materials)

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Copyright © 2018 Tao-Hua Lan 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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