Systematic Investigation of the Effect of Powerful Tianma Eucommia Capsule on Ischemic Stroke Using Network Pharmacology

Feng, Pengcheng; Li, Guixia; Huang, Yan; Pei, Jinhong

doi:https://doi.org/10.1155/2021/8897313

Evidence-Based Complementary and Alternative Medicine

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

Research Article | Open Access

Volume 2021 | Article ID 8897313 | https://doi.org/10.1155/2021/8897313

Systematic Investigation of the Effect of Powerful Tianma Eucommia Capsule on Ischemic Stroke Using Network Pharmacology

Pengcheng Feng,¹Guixia Li,¹Yan Huang,¹and Jinhong Pei¹

Academic Editor: Vincenzo De Feo

Received19 Sept 2020

Revised08 May 2021

Accepted21 May 2021

Published07 Jun 2021

Abstract

Background. Ischemic stroke (IS) is a serious disease with a high rate of death and disability, and a growing number of people are becoming victims. Existing drugs not only have limited therapeutic effects but also have obvious side effects. Most importantly, drug resistance due to long-term or improper use of drugs is detrimental to patients. Therefore, it is urgent to find some alternative or supplementary medicines to alleviate the current embarrassment. Powerful Tianma Eucommia Capsule (PTEC) is mainly used to treat IS in China for thousands of years; however, the molecular mechanism is not clear. Methods. Pharmacology ingredients and target genes were filtered and downloaded from websites. A pharmacology ingredient-target gene network was constructed to predict the molecular interactions between ingredients and target genes. Enrichment analysis was performed to explore the possible signal pathways. LeDock was used to simulate the interaction form between proteins and main active ingredients and to deduce key amino acid positions. Results. Two hundred eighty-nine target genes and seventy-four pharmacological ingredients were obtained from public databases. Several key ingredients (quercetin, kaempferol, and stigmasterol) and primary core target genes (PTGS1, NCOA2, and PRSS1) were detected through ingredient-target gene network analysis. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis demonstrated that ingredients affect networks mainly in nuclear receptor activity and G protein-coupled amine receptor activity; besides, fluid shear stress and atherosclerosis, human cytomegalovirus infection, and hepatitis B signaling pathways might be the principal therapy ways. A series of presumed key amino acid sites (189ASP, 190SER, 192GLN, 57HIS, and 99TYE) were calculated in PRSS1. Six of the target genes were differentially expressed between male and female patients. Conclusions. Seven new putative target genes (ACHE, ADRA1A, AR, CHRM3, F7, GABRA1, and PRSS1) were observed in this work. Based on the result of GO and KEGG analysis, this work will be helpful to further demonstrate the molecular mechanism of PTEC treatment of IS.

1. Introduction

Ischemic stroke (IS) is a severe disease due to insufficient blood supply or blockage of blood flow to certain parts of the brain. Although IS has a high rate of incidence, recurrence, and disability, as long as the response is fast enough, the harm caused by the disease can be effectively alleviated, elimination of intravascular thrombi within 5 hours [1–3]. Over 1.1 million people are killed every year due to IS, according to the report from World Health Organization (WHO) [4].

Numerous investigations have proved that IS can be cured by removing the thrombus (drugs and thrombectomy), but efficient recanalization remains a challenge [5]. During the clinical treatment of IS, the resistance to certain drugs and side effects have become increasingly obvious [6, 7]. In a study of platelet resistance in juvenile patients with acute IS and its association with early neurological deterioration (END) and recurrent ischemic stroke (RIS), it was found that 24.4% of patients are aspirin resistant, 35.9% are clopidogrel resistant, and 19.2% are both aspirin and clopidogrel resistant [7, 8].

Scientists have done much work to explore the pathogenic mechanisms. Some miRNAs and LncRNAs related to neuronal damage, destruction of blood-brain barrier, inflammation, autophagy, and the occurrence of IS were identified in recent years [9, 10]. Hydrogen may be a complementary therapy to treat IS due to the antioxidative and anti-inflammatory effect [11]. Sonic hedgehog (Shh) signaling pathway and stem cell are related to oxidative stress and neurogenesis. Maybe, they are novel strategies for the treatment of IS [12]. However, researchers are committed to finding therapeutic drugs, including molecular drugs and “new use of old drugs.” Khaksari et al. have shown that the peptide hormone Apelin-13 (serum apolipoprotein-13), originally isolated from the bovine stomach, may protect the blood-brain barrier from ischemic injury through aquaporin, antiapoptotic activity, reduction of cerebral infarction volume, and edema [13]. However, clinical studies had shown that a high level of Apelin-13 was a poor prognostic molecule and often associated with high recurrence rates and high complications [14]. Platelet thrombosis is one of the main reasons for the low cure rate of IS. It has been proven that metformin can inhibit platelet activation and thrombosis, thereby alleviating the condition of IS mice. Xin et al. optimized the derivative biguanide to reduce platelet aggregation and adhesion, and long-term treatment showed no obvious toxicity [15].

Powerful Tianma Eucommia Capsule (PTEC) (a traditional Chinese patent medicine) has good therapeutic effects on dispelling wind and promoting blood circulation, relaxing muscles, and relieving pain. PTEC is mainly used to treat IS clinically, which is made from Tianma (Gastrodia elata), Duzhong (Eucommia ulmoides Oliver), Zhicaowu, Fuzi (Aconiti Lateralis Radix Praeparata), Duhuo (Radix Angelicae Sinensis), Gaoben (Ligustici Rhizoma et Radix), Xuanshen (Figwort Root), Danggui (Angelicae Sinensis Radix), Dihuang (Rehmanniae Radix), Hujisheng (Viscum angulatum Heyne), Qianghuo (Notopterygii Rhizoma et Radix), and Chuanniuxi (Cyathulae Radix) in a specific ratio [16–20]. These traditional Chinese herbal medicines are widely used in the clinical treatment of IS; the therapeutic effect of this drug was far beyond that of a single herbal. Therefore, the ingredients in PTEC may be effective through multiple targets and pathways.

Network pharmacology, a research strategy based on protein-chemical relationships and disease-protein relationships, is used for drug discovery and development and to predict the molecular mechanism of drug treatment of disease [21]. In the study of the treatment mechanism, this technical strategy makes the analysis more comprehensive. In this work, an ingredient-target gene network was constructed to investigate the underlying molecular mechanism of PTEC against IS. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) enrichment analysis were carried out to investigate the role of target genes in cells and signaling pathways. Molecular docking was performed to verify the interactions between key genes and ingredients. This work was not only helpful to understand the mechanism of cure IS but also meaningful to explore new clinical value not just its traditional applications.

2. Materials and Methods

2.1. Database Construction

The pharmacological ingredient information of Powerful Tianma Eucommia Capsule was obtained from the TCMSP (https://tcmspw.com/tcmsp.php). The pharmacological ingredients with oral bioavailability (OB ≥ 30%), drug-likeness (DL ≥ 0.18), and drug half-life (HL ≥ 3) were selected as candidates. Related target genes were downloaded from TCMSP according to candidate pharmacological ingredients.

2.2. Collection of Ischemic Stroke-Related Proteins

GeneCards (https://www.genecards.org/version5.0) and OMIM (https://omimorg/search/advanced/geneMap) were used to obtain IS-related proteins. “Ischemic stroke, infarction, pectoris, and atherosclerosis” were used as keywords to search in the websites of GeneCards and OMIM. All related proteins were downloaded and summarized.

2.3. Construction and Analysis of Networks

An ingredient-target gene network was constructed by Cytoscape 3.7.1. Each independent gene and effective ingredient of the medicine is called a node, and the line emitted by each node is called a degree. The degree values were evaluated and exported by Cytoscape option network analyzer. In this work, the nodes, with a higher degree than the average value, were considered to play critical roles in the treatment of IS. STRING (version 11.0, https://string-db.org/) was used to calculate and predict protein-protein interaction (PPI) network. To have high confidence, the interaction parameter was set at 0.9. Cytoscape 3.7.1 was applied to visualize two networks. The top 50 genes were shown by the MCC algorithm in CytoHubba.

2.4. Enrichment Analysis of Target Genes

GO enrichment analysis was applied to interpret the biological function. Kyoto Encycolopedia of Genes and Genomes (KEGG) enrichment analysis was used to elaborate the pathways of the target genes by R packages (colorspace, stringi, DOSE, clusterProfiler, and pathview). The two-side hypergeometric test method was used in this part. The measure is value less than 0.05.

2.5. Molecular Docking

The 3D structure of ingredients and crystal structures of proteins was downloaded from TCMSP and Protein Data Bank, separately [22]. LePro was adopted to process protein receptor files and Chimera 1.13.1 used was to minimize ligand structure. All parameters were set to default values. LeDock (http://www.lephar.com/) was applied to molecular dock. LeDock, based on simulated annealing and evolutionary optimization, is more accurate and efficient than some commercial programs [23]. The interactions among main ingredients and the target genes were visualized and displayed in 3D diagrams by PyMOL 1.8 and Chimera 1.13.1. Amino acids, 3 Å far from ligand, were shown in a 3D structure diagram. And H-bond was predicted between ostensive amino acids and ligands.

2.6. Determining Gene Expression Atlas

The Human Protein Atlas (https://www.proteinatlas.org) was an important resource that can provide single gene expression patterns in tissue, cell line, pathology, brain, and blood. The gene expression patterns of ten genes (NCOA2, PTGS1, PRSS1, ESR1, F7, RELA, CTNNB1, FOS, NCOA1, and NR3C1) were downloaded and summarized.

2.7. Statistical Analysis

In this work, R language (version 3.6.3) was used to perform statistical analysis. All values are expressed as mean ± standard deviation. value < 0.05 was considered statistically significant. In the part of GO and KEGG enrichment analysis, Q value and adjusted value were both less than 0.05, and this value was considered statistically significant.

3. Result

3.1. Collection of Pharmacological Ingredients and Target Genes

The designations of all Chinese herbal medicines from PTEC were used as keywords to search for pharmacological ingredients from CTMSP. Seventy-four ingredients were filtered by parameters of OB, DL, and HL. Two hundred eighty-nine protein targets were found according to 74 pharmacological ingredients. Perl was used to translate protein names into gene symbols. The proteins that did not match the gene symbol were deleted. Finally, a hundred four gene names were translated into gene symbols. Two hundred eighty-nine ingredient-target gene relationships were confirmed. The detailed information is shown in Tables S1 and S2.

3.2. Screening of Common Genes

Seven thousand forty-four genes were obtained from the GeneCards website that provides annotated human genes information. Fifty-five genes were obtained from OMIM. A total of 7078 unique genes were collected. Ninety-three common proteins were filtered by the Venn tool. According to 289 ingredient-target relationships and the gene symbols of 93 proteins, 41 pharmacological ingredients were obtained. The relationship of proteins is shown in Figure 1.

3.3. Construction of Ingredient-Target Network

The herbs, Tianma, Zhiwucao, Gaoben, and Hujisheng, without qualified pharmacological ingredients, were deleted, so the pharmacological ingredients were without IS-related target genes. The ingredient-target network consisted of 41 pharmacological ingredients, 93 target genes, 8 herbs, 1 drug, and 1 disease. This network was composed of 144 nodes and 412 edges. The ingredient-target network is shown in Figure 2. In this network, target genes, such as NCOA2, PTGS1, PRSS1, F7, and ESR1, were considered critical target genes (degree ≥ 10) regulated by pharmacological ingredients. Additionally, quercetin, kaempferol, β-sitosterol, stigmasterol, (-)-tabernemontanine, cinchonan-9-al, 6’-methoxy-, (9R)-, β-carotene, and β-vulgarin were predicted as the major pharmacological ingredients. Sitosterol is a compound contained in Dihuang, Hujisheng, and Qianghuo. β-sitosterol is a unique ingredient in Hujisheng and Chuanniuxi. Quercetin and kaempferol consist of 71 and 31 disease target genes, respectively, of which 26 are common targets. Five common targets were found among β-sitosterol, quercetin, and kaempferol. A single ingredient could regulate multiple target genes, whereas a single gene could be regulated by multiple ingredients. This network was composed of multiple ingredients and multiple target genes. Taken together, these data demonstrated that “multicomponent multitarget gene” was one of the mechanisms of PTEC treatment of IS.

3.4. Obtaining Pivotal Target Genes

All 93 genes were uploaded to STRING to explore the protein-protein interaction network. The gene pairs that can interact with each other were downloaded in CSV file. The interaction relationship of the top 50 genes was shown by the MCC algorithm in CytoHubba in Figure 3. The degree of each protein was reflected by the size of the circle. RESR1, RELA, CTNNB1, FOS, and NCOA1 might play important roles in this network (degree ≥ 10).

3.5. GO and KEGG Enrichment Analysis

GO enrichment was performed by R 3.6.3 to elucidate the multiple biological functions of 93 genes and the top 15 enrichment terms are shown in Figure 4(a). The GO categorization indicated that putative targets were mainly enriched in G protein-coupled amine receptor activity, activating transcription factor binding, DNA-binding transcription activator activity, RNA polymerase II-specific, cysteine-type endopeptidase activity involved in apoptotic process, neurotransmitter receptor activity, ammonium ion binding, and so on. The detailed information of 114 GO enrichment terms is shown in Table S3.

(a)

(b)

(c)

KEGG pathway enrichment analysis was conducted and 120 pathways were filtered by adjusted value (less than 0.05): multiple cancers signaling pathways (prostate cancer, colorectal cancer, pancreatic cancer, endometrial cancer, breast cancer, and gastric cancer), fluid shear stress and atherosclerosis, TNF signaling pathway, VEGF signaling pathway, cAMP signaling pathway, and so on. The detailed information of KEGG enrichment analysis is shown in Table S4. IS is a kind of senile disease attributed to vascular sclerosis. Target genes were enriched in fluid shear stress and atherosclerosis signaling pathway was marked in red (Figure 4(c)).

3.6. Molecular Docking Simulation

In this work, LeDock was used to predict the pose of ligand and key amino acid in target genes. The target genes and ingredients with a degree greater than 10 were used to dock. In this part, twelve target genes and eleven ingredients were selected to the molecular dock. At the same time, NCOA2 (PDB ID: 5KRH, ligand: 6WN) and PRSS1 (PDB: 1FXY, ligand: 0G6) were analyzed as control. The docking affinity of NCOA2 and 6WN was −6.82 kcal/mol. The predicted pose and location of the two ligands were almost the same as the native, and concrete results were supplied in Figures S1 and S2. Thirty-eight molecular docking jobs were performed on LeDock and the docking affinity scores are shown in Table S5. Molecular docking between quercetin and numinous target genes is shown in Figure 5. Affinity scores of molecular dockings between quercetin and PRSS1, PTGS1, and NCOA1 were −7.09, −6.8, and −6.58 kcal/mol, respectively; these data indicated that great binding interactions were existing between quercetin and these genes. The hydrogen bonds between ligands and amino acids (191CYS and 193 GLY) may be vital in ligands binding to PRSS1. The worth of 189ASP, 190SER, 192GLN, 57HIS, and 99TYE could not be ignored.

(a)

(b)

(c)

3.7. Determining Gene Expression Atlas

Thanks to the Human Protein Atlas, the expressions of 10 genes have been shown. PTGS1 was highly expressed in brain and subsets of cells in tissue stroma and megakaryocytes. PRSS1, ESR1, and NR3C1 were highly expressed in immune cells. No difference in expressions of F7, NCOA1, PRSS1, and RELA was found among sexual organs and gonads between males and females. Six genes’ expressions in sexual organs are shown in Figure 6.

4. Discussion

Cerebrovascular disease is one of the world’s leading causes of death and disability, even in developed countries with more advanced medical equipment and higher medical standards [24, 25]. IS, especially in the elderly, is becoming one of the most common cerebrovascular diseases. Thrombolytic agents, anticoagulants, and antiplatelet agents are the mainstream drugs; some limitations were observed in timeliness and effectiveness of their application (prime time for thrombolysis is within 4.5 h and urgent anticoagulation may lead to intracranial bleeding) [26]. In the East, Chinese herbal medicine has been used to treat stroke for thousands of years due to its cheap and easily available resources. A variety of Chinese patent medicines can be used to treat IS, and many scholars have conducted research on medicines such as Tribulus Terrestris [27], Shuxuening injection [28, 29], baicalin [30], geniposide [31], Chuanxiong-Chishao [32], Musk [33], Nao An capsule [34], Deng-Zhan-Xi-Xin injection [35], scutellarin [36], and Qingkailing injection [37].

In this work, we explored the potential mechanism of PTEC against IS. Seventy-four ingredients were screened from PTEC. Quercetin as a main ingredient that possessed the potential to treat IS was not only found in this work [34], but previous studies have shown that quercetin cures IS by inhibiting μ-calpain, Na⁺ channel, and acid-sensing ion channels [38, 39]. NAD⁺-dependent deacetylases (SIRT), a gene family, are related to many diseases including IS, and quercetin could alleviate the condition of stroke patients by activating SIRT1 [40]. Quercetin protected against neuronal injury by inhibiting the activation of MMP-9 and µ-calpain and attenuating blood-brain barrier disruption [38]. Acid-sensing ion channels (ASICs) were relevant to lots of diseases; quercetin could deactivate some related proteins [41]. Some benefits for IS patients were obtained by kaempferol inhibition of mitochondrial apoptotic pathway [42, 43]. In summary, the results of previous studies had shown that quercetin and kaempferol could treat or effectively alleviate the condition of IS patients. In this study, PTEC contained these two components. Therefore, we believed that PTEC could treat IS with a scientific basis [39, 44].

Some of the main target genes (ESR1 and RELA) were also found from Precursors works [29, 34]. An association between variation in the estrogen receptor-alpha gene (ESR1) and cerebrovascular disease is related to gender [45]. PTGS1 was highly expressed in females than males. Some diversities in single nucleotide polymorphisms (SNP) of the ESR1 have different effects on the risk of IS, such as the onset age and the probability of developing cerebrovascular disease [46]. RELA is a part of the nuclear factor Kappa-B family (NF-κB), which is concerned with inflammation and occurrence and progression of cancer. RELA-specific acetylation is critical to the prevention and treatment of IS [47, 48]. The genetic variation in PTGS1 may increase the risk for cerebrovascular disease events [49]. Abnormally expressed NCOA2 is usually associated with signal transduction and disease progression and is a potential drug target for many cancers [50, 51]. The polymorphisms and activation of coagulation factor VII gene (F7) may increase the risk of IS in adult patients [52–54]. These studies confirmed that PTGS1, NCOA2, PRSS1, F7, and ESR1 are involved in the occurrence, development, and deterioration of IS. PTEC may achieve therapeutic effects by regulating these genes. Furthermore, ACHE, ADRA1A, AR, CHRM3, F7, GABRA1, and PRSS1 were not previously found; they might be the new targets against IS.

Thanks to GO and KEGG, numerous inflammation signaling pathways and target therapeutic pathways were discovered. PTGS1 was referred to as antioxidant activity (GO: 0016209), heme binding (GO: 0020037), tetrapyrrole binding (GO: 0046906), and peroxidase activity (GO: 0004601) during GO enrichment analysis. NCOA2 was referred to as nuclear hormone receptor binding (GO: 0035257), hormone receptor binding (GO: 0051427), nuclear receptor transcription coactivator activity (GO: 0030374), and transcription coactivator activity (GO: 0003713). PRSS1 and F7 were responsible for endopeptidase activity (GO: 0004175). ESR1 was related to nuclear receptor activity (GO: 0004879), steroid hormone receptor activity (GO: 0003707), and steroid binding (GO: 0005496). Several target genes were enriched in immune- and inflammation-related pathways (JAK-STAT signaling pathway, NF-κB signaling pathway, Toll-like receptor signaling pathway, B cell receptor signaling pathway, and T cell receptor signaling pathway). NF-κB signaling pathway, MAPK signaling pathway, and HIF-1 signaling pathway were found to be associated with IS by immense amounts of research. Fifty genes were enriched in the MAPK signaling pathway, including FOS and RELA. IS patients may be worsening, when MAPK signaling was activated [55]. TNF-α could activate glial cells and lead to damage of the blood-brain barriers [56].

Six of the target genes (ESR1, FOS, PTGS1, NR3C1, NCOA2, and CTNNB1) were differentially expressed between males and females. One hundred twenty-three differentially expressed genes were identified from GSE22255 (Gene Expression Omnibus data) [57]. It was necessary to classify some medicines to males and females separately. These six genes highly expressed in females indicated that PTEC may more efficient for females.

Obviously, some limitations were observed when the results were just predicted by bioinformatic methods. It was necessary to perform cell experiments or animal experiments to confirm the predicted mechanism. What is more, the hypothesis that PTEC was more efficient for females needs to be verified.

Abbreviations

IS:	Ischemic stoke
PTEC:	Powerful Tianma Eucommia Capsule
END:	Early neurological deterioration
RIS:	Recurrent ischemic stroke
Shh:	Sonic hedgehog
TCMSP:	Traditional Chinese medicine system pharmacology database and analysis platform
OMIM:	Online Mendelian Inheritance in Man
GO/KEGG:	Gene Ontology/Kyoto Encyclopedia of Genes and Genomes
OB/DL/HL:	Oral bioavailability/drug-likeness/drug half-life
PPI:	Protein-protein interaction.

Data Availability

The data used in this study can be found on the public website.

Conflicts of Interest

The authors declare no conflicts of interest.

Authors’ Contributions

Pengcheng Feng and Guixia Li are the major contributors in writing this manuscript; they contributed equally to this work. Pengcheng Feng is the responding author. Yan Huang and Jinhong Pei provided a few studies, ideas, and some revised opinions. All authors have read and agreed on the published version of the manuscript.

Acknowledgments

The authors would like to acknowledge the Department of Basic Medicine at Changzhi Medical College. At the same time, they would also like to thank Shijun Wang (Changzhi Medical College) for helping with the molecular docking studies.

Supplementary Materials

All tables and molecular docking control lines can be found in supplementary materials. (Supplementary Materials)

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Copyright © 2021 Pengcheng Feng 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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