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Network pharmacology-based assessment to elucidate the molecular mechanism of anti-diabetic action of Tinospora cordifolia
Clinical Phytoscience volume 5, Article number: 35 (2019)
Tinospora cordifolia is used traditionally for the treatment of diabetes and is used in various formulations. Scientific evidence is also available for its anti-diabetic potency under various animal models. However, the probable molecular mechanism of Tinospora cordifolia in the treatment of diabetes has not been illuminated yet. Hence, the present study dealt to elucidate the probable molecular mechanism of anti-diabetic effect of Tinospora cordifolia using network pharmacology approach.
The structural information of bioactive phytoconstituents was retrieved from different open source databases. Compounds were then predicted for their hits with the probable targets involved in the diabetes mellitus. Phytoconstituents were also predicted for their druglikeness score, probable side effects, and ADMET profile. The modulated protein pathways were identified by using the Kyoto Encyclopedia of Genes and Genomes pathway analysis. The interaction between the compounds, proteins, and pathways was interpreted based on the edge count. The docking study was performed using Autodock4.0.
Nine phytoconstituents from Tinospora cordifolia were identified to modulate the pathogenic protein molecules involved in diabetes mellitus. Among them, tembetarine scored highest druglikeness hit and had the maximum interaction with proteins involved in diabetes. Further, neuroactive ligand-receptor interaction was predicted as majorly modulated pathway.
The current study identified an important antidiabetic constituent, tembetarine which modulated the majority of diabetic proteins majorly modulating neuroactive ligand-receptor interaction.
Type 2 diabetes mellitus (T2DM) is a metabolic disorder due to insulin insensitivity/insulin resistance; modern pharmacotherapy utilizes synthetic oral hypoglycaemic agents . Although these molecules are effective in the management of elevated blood glucose level, they are not free from numerous side effects like genital mycosis, pancreatitis, ketoacidosis, nausea, vomiting, fractures, and neuropathy risk. GLP-1 agonists (p), like liraglutide, dulaglutide, and exenatide are contraindicated in multiple endocrine neoplasia (MEN) type 2 due to high risk of C cell tumor in thyroid and pancreatitis . Further, T2DM is a polygenic condition; includes the collaborative task of multifarious pathogenic genes forming a labyrinthine disease network within the biological system . Hence, blocking the task of one protein could trigger another pathway to earn the same response within the disease network. This could be due to the collaborative function of multiple genes in a synergistic pattern to achieve a particular response.
The current synthetic oral hypoglycaemic agents target a specific protein ; however, it is to be understood that a single drug can regulate multiple proteins as a “single master key unlocks multiple locks” , which could be dose-dependent i.e. minimization of dose may not achieve the desired pharmacological response and a higher dose may lead to adverse effects. Hence, for the management of complex disease like diabetes, it may not be advisable to target a single protein molecule; instead, target the multiple proteins with a low dose of multiple compounds and achieve the synergistic effect. Herbal medicines are reported to manage the diabetic condition followed by its symptomatic relief, also prevent the probable complications; via the regeneration of beta-cells, minimization of insulin resistance  and lowering the elevated blood glucose level by restoring the liver glycogen level . Multiple herbal medicines and their preparations have been reported to possess the anti-diabetic activity . Further, isolated compounds from traditional folk medicines have also been identified to possess the anti-diabetic activity . However, folk medicine lacks sufficient scientific data in the management of complex diseases like diabetes; be short of evidence in phytoconstituents composition, mechanism of action and ADMET profile.
Tinospora cordifolia, commonly identified as heart-leaved moonseed, Guduchi, belongs to the family Menispermaceae is recorded as “Guduchi (St)” in the Ayurvedic Pharmacopoeia of India; utilized in the management of “Prameha” (an ayurvedic term that explains clinical conditions involved in obesity, prediabetes, diabetes mellitus, and metabolic syndrome). Further, Ayurvedic Pharmacopeia of India records terpenoids and alkaloids as a major phytoconstituents in the management of Jvara (Fever), Kustha (Skin disorders), Pandu (Anaemia), Vatarakta (Gout) and Kamala (Jaundice) . Scientific reports have been made for T. cordifolia as an anti-diabetic agent in various experimental animal models [10, 11]. However, the probable mechanism of T. cordifolia in the management of diabetes has not been illuminated yet. Hence, the present study aims to identify the potential phytoconstituents from T. cordifolia, identify their targets involved in diabetes mellitus (DM) and report the probable mechanism in its management via the network pharmacology approach.
Mining of phytoconstituents and proteins involved in diabetes
Phytoconstituents of T. cordifolia were mined from the available literature; scientific journals and traditional medicinal books. The database was constructed for the phytoconstituents, their types, SMILES and PubChem CID. The duplication of phytoconstituents was eliminated during the construction of the database. The canonical SMILES and PubChem CID of each phytoconstituents were retrieved from the PubChem Database . SMILES were queried for the prediction of the target in BindingDB  at the percentage similarity of 70% with known ligand molecules. The proteins involved in diabetes were identified with reference to the known targets of diabetes reported in Therapeutic Target Database (TTD) . Gene ID of each protein molecule identified as the target of diabetes mellitus was retrieved from the UniProt .
Druglikeness prediction and ADMET profile
Phytoconstituents were predicted for the druglikeness score via the utilization of “Lipinski’s rule of five” model by using MolSoft (http://www.molsoft.com/). Similarly, admetSAR2.0  was used to predict ADMET profile of individual phytoconstituents.
Prediction of side effects
ADVERpred  was used to predict the probable side effects by querying the SMILES of each phytoconstituent. The mol charge of the phytoconstituents was removed (if present) during the prediction of side effects. The side effects were considered if the probable activity (Pa) is higher than probable inactivity (Pi) and Pa value greater than 0.7.
Pathway and network analysis
Set of proteins involved in DM was queried in STRING  and gene enrichment analysis was performed to identify the pathways that are modulated by the phytoconstituents. Further, the KEGG pathway(https://www.genome.jp/kegg/) analysis was performed to identify the pathways involved in DM. Cytoscape  3.5.1 was used to construct the network between phytoconstituents, protein molecules, and identified pathways. The color and node size scale were used to interpret the whole network which is based on the number of edges (edge count). The node with the maximum number of edge count was indicated with colossal node.
Three-dimensional structure of tembetarine was retrieved from PubChem database and minimized using MMFF94 forcefield . The target molecule beta 1 adrenergic receptor was retrieved from the RCSB (https://www.rcsb.org/) database. Discovery Studio  was used to remove water molecules and heteroatoms from the protein molecule. Similarly, SWISS-MODEL  was used for the homology modeling of beta 1 adrenergic receptor by using accession number: NP_000675.1 as a query sequence and PDB ID: 4BVN as a template. AutoDock4.0  was used to predict the binding affinity of tembetarine with beta 1 adrenergic receptor. After docking, the pose scoring the lowest binding energy was chosen to visualize the ligand-protein interaction.
Mining of phytoconstituents and proteins involved in diabetes
Thirty-one different phytoconstituents were identified in Tinospora cordifolia from different databases and other open-source records; nine of them were predicted to modulate the diabetic protein molecules (Table 1). These phytoconstituents were identified as alkaloids, terpenes, and steroids. Similarly, the majority of the targeted diabetic protein molecules were surface proteins and enzymes (Fig. 1).
Predictive side effects, ADMET profile, and druglikeness of compounds
Except for N-E-feruloyl tyramine, all the eight phytoconstituents were predicted for their probable side effects. The probability of side effects for arrhythmia, myocardial infarction, and nephrotoxicity of predicted compounds is shown in Fig. 2. Phytochemicals were predicted for their probability for absorptivity, blood-brain barrier permeability, isoenzyme inhibitory activity, mutagenicity, plasma protein binding affinity, and fish aquatic toxicity. The ADMET profile of each phytoconstituent is represented in heat map (Fig. 3). Similarly, all nine phytoconstituents were predicted for their druglikeness score; the highest was scored by tembetarine (Table 2).
Pathway and network analysis
Gene set enrichment analysis identified thirteen different pathways; modulated by proteins involved in the DM. The peer interpretation of protein interaction under the KEGG pathway analysis identified four different pathways which are directly linked in the pathogenesis of DM. Among them, neuroactive ligand-receptor interaction was identified to score the highest count of gene sets with the lowest false discovery rate (Table 3). Sixty-seven edges were identified in the drug-protein-pathway network in which fifty-two were target-phytoconstituents interactions and fifteen were target-pathway interaction. The constructed network included thirty-four nodes representing four pathways, twenty-one targets and nine phytoconstituents. Tembetarine scored highest edge count; interaction was found with twelve protein molecules i.e. ACACB, ADRA1D, ADRA2C, ADRB1, DPP4, DRD1, DRD1B, ESR1, HTR2A, HTR2C, KCNA4, and PARP1. Similarly, neuroactive ligand-receptor interaction modulated the highest number of protein molecules i.e. DRD5, ADRB1, DRD1, CNR2, ADRA2C, NR3C1, HTR2A, ADRA1D, and HTR2C. Tembetarine majorly modulated proteins which are involved in neuroactive ligand-receptor interaction pathway i.e. ADRA1D, ADRA2C, ADRB1, DRD1, HTR2A, and HTR2C (Fig. 4). Further, ADRA1D, ADRA2C, ADRB1, CNR2, DRD1, HTR2A, HTR2C, and NR3C1 proteins from neuroactive ligand-receptor interaction pathway were also modulated by other phytoconstituents to show the synergistic effect for anti-diabetic activity.
The binding affinity and inhibitory constant of tembetarine with beta 1 adrenergic receptor was found to be − 6.25 kcal/mol and 36.45 μM respectively. Two hydrogen bond interactions were found in ligand-protein complex i.e. ASN:94 and THR:93 with “H” atom (hydroxyl group attached to carbon 19) and “O” atom (hydroxyl group attached to carbon 4) respectively (Fig. 5).
Exploration of folk medicines for the management of complex diseases like diabetes via the utilization of network pharmacology is a well-accepted approach. Many attempts have been made to understand the molecular mechanisms of folk medicines in the management of the multifaceted disease by using network pharmacology [24,25,26]. The utilization of T. cordifolia has been demonstrated for the management of DM . However, the molecular mechanism of T. cordifolia in the management of diabetes has not been illuminated clearly. Hence, the current study utilizes the network pharmacology approach to understand the probable molecular mechanisms of T. cordifolia in the management of DM.
We constructed the network interaction between phytoconstituents, their targets, and probable pathways. The result reflects terpenes, steroids, and alkaloids as a potential phytoconstituents to interact with multiple protein molecules involved in the pathogenesis of DM. Among them, tembetarine, a benzyl-iso-quinoline alkaloid possesses the potential role in the pharmacotherapy of DM by targeting the numerous protein molecules within the network. Ayurvedic Pharmacopoeia of India records terpenoids and alkaloids as major phytoconstituents in T. cordifolia ; were involved to modulate the multiple pathogenic protein molecules which are associated with DM.
One of the clinical trials of T. cordifolia reports the alkaloids as a potential phytoconstituents in the management of diabetes in T2DM patients . Further, the reports have been found to explain the beneficial role of alkaloids in the management of diabetes and associated complications . This could be due to the prime role of tembetarine with other phytoconstituents by targeting the numerous protein molecules involved in the pathogenesis of DM to work in a synergistic way as demonstrated in the current findings.
Targeting dopamine and serotonin receptors are identified as one of the approaches in the pharmacotherapy of DM [29, 30]. The present study predicts tembetarine for its maximum druglikeness score (Table 2) and probability to cross the blood-brain barrier (Fig. 3). This suggests the probability of tembetarine to act on the dopamine and serotonin receptors and modulate the glucose homeostasis via the participation in noradrenaline output, appetite control and perpetuating biological clock which directly responds to the pancreatic beta-cell secretion.
The control in the appetite is also one of the important approaches in diabetes management . The current study identifies tembetarine and tetrahydropalmate to inhibit DPP4 (Table 1) and increase the level of incretins suggesting their important role in the appetite control and participation in glucose homeostasis. Further, T. cordifolia is reported for its protective effect against insulin resistance and oxidative stress  and contribute in improving glucose tolerance in diabetic rats ; demonstrated in the current study by modulating ESR1 and PTPN1 proteins by steroids.
KEGG pathway analysis indicated the important role of T. cordifolia in the management of diabetes by modulating four major pathways i.e. neuroactive ligand-receptor interaction, aldosterone-regulated sodium reabsorption, insulin resistance, and insulin signaling pathway. KEGG pathway records neuroactive ligand-receptor interaction as one of the major pathways for leptin deficiency (KEGG Entry: H02059), leptin receptor deficiency (KEGG Entry: H02060), and genetic obesity (KEGG Entry: H02106, ). Leptin deficiency is one of the major reasons due to the uncontrolled diabetic condition  leading to unregulated appetite, thermo-genesis, elevated hepatic gluconeogenesis and lowered glucose uptake expounding the shape of insulin resistance . Aldosterone-regulated sodium reabsorption is associated with insulin-resistant diabetes mellitus with acanthosis nigricans (KEGG Entry: H01228) . In the current study, two genes i.e. PTPN1 and ACACB were identified to be regulated which are involved in the insulin resistance/signaling. PTPN1 is identified to eradicate phosphate groups from phosphorylated tyrosine residues and is involved in T2DM and insulin resistance . ACACB inhibits glucose and fatty acid oxidation and enhances the storage of fat. It also regulates the oxidation of fatty acid in mitochondria via the inhibition of carnitine palmitoyltransferase 1; proves imperative character in diabetic and obese conditions .
The in vitro and in vivo studies reflect the potency of alkaloids and steroids from T. cordifolia play a crucial role in the management of diabetes . The previous report suggests the insulin sensitivity efficacy of T. cordifolia [41, 42] which could be due to the interaction of β/γ-sitosterol with PTPN1 and ACACB (Table 1). Further, alkaloid rich fraction has been reported to minimize the elevated blood glucose level via the insulin mimicking and insulin-releasing effect . The current study identifies modulation of neuroactive ligand-receptor interaction (KEGG Entry: hsa04080) via the majority of the phytoconstituents including tembetarine; modulates secretins e.g. glucagon and glucagon-like peptide (GLP) which are well-acknowledged for insulin sensitization. This suggests alkaloids from T. cordifolia modulate the insulin sensitivity via neuroactive ligand-receptor interaction.
Insulin resistance and T2DM are the major contributing factors in the cardiomyopathy  which is one of the risk factors in diabetic complications. Beta 1 adrenergic receptor is reported to activate phospholamban in myocytes and eNOS in myocytes ; phospholamban decreases muscle relaxation and cardiac contractility ; decreases heart rate and stroke volume respectively and eNOS maintains vascular tone . The role of neuroactive ligand-receptor interaction in the cardioprotection has been reported . In the current finding, three different phytoconstituents i.e. tembetarine, tetrahydropalmatine, and magnoflorine were identified to interact with ADRB1; one of the protein molecules from neuroactive ligand-receptor interaction. Hence, the reported cardioprotective effects of T. cordifolia [48, 49] could be due to the interaction with ADRB1 and neuroactive ligand-receptor interaction. This finding is further supported by the mining of protein targets which identified ADRB1 as a potential target for tembetarine.
In conclusion, we identified tembetarine as one of the major alkaloids to interact with the maximum number of protein molecules that are involved in the pathogenesis of DM. Further, neuroactive ligand-receptor interaction was identified as a major pathway in the management of diabetes and cardio-protection which is one of the major risks in insulin resistance and diabetes. However, the current findings are only based on processor simulations which need to be demonstrated via wet-lab protocols.
Availability of data and materials
The datasets analyzed during the current study are available from Pukar Khanal (corresponding author) on request.
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The authors are thankful Dr. N. A. Khatib, Associate Professor and Head of Department, Department of Pharmacology for his support and encouragement of work. The authors are also thankful to Ms. Jyoti K for her assistance during data mining.
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Khanal, P., Patil, B.M., Mandar, B.K. et al. Network pharmacology-based assessment to elucidate the molecular mechanism of anti-diabetic action of Tinospora cordifolia. Clin Phytosci 5, 35 (2019) doi:10.1186/s40816-019-0131-1
- Diabetes mellitus
- Network pharmacology
- Neuroactive ligand-receptor interaction
- Tinospora cordifolia