Department of Pharmacy
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Item Investigation of antibacterial potential of Natsiatum herpeticum Buch.-Ham. ex Arn. using in silico-in vitro approach(Elsevier, 2024-01) Jadhav, Hemant R.Since ages, natural products have laid the foundation for the development of promising antimicrobials. With the advent of antimicrobial resistance, the search for effective antimicrobials continues as its shortfall will menace the healthcare system. Natsiatum herpeticum remained the least explored plant despite its ethnopharmacological claims. DNA barcoding was performed to identify and ensure quality control of the plant materials used in the experiment. QToF-MS analysis followed by network pharmacology revealed TNF and IRAK4 to be the two gene targets that can be modulated by the compounds present in the extract. Analysis of potential drug-like compounds using molecular docking (against 1KZN, 2VF5, 2W9S, and 4CJN) and MD simulation suggested compound CPD2 to be the most potent molecule against the bacterial targets. Bacteriostatic activity against E. coli was exhibited by the extract (MIC=50 μg/ml) in the microtiter-plate dilution method. Our results suggest that N. herpeticum not only exhibits potential bacteriostatic activity against E. coli but can also modulate host-immune responses via TNF and IRAK4-associated pathways.Item Unveiling the potential of novel indol-3-yl-phenyl allylidene hydrazine carboximidamide derivatives as AChE/BACE 1 dual inhibitors: a combined in silico, synthesis and in vitro study(RSC, 2024-07) Jadhav, Hemant R.Alzheimer's disease (AD) is a complex and debilitating neurological disorder that primarily affects the brain, leading to cognitive decline and memory loss. AD is a chronic and progressive disease that gradually impairs an individual's ability to function independently, affecting their daily activities and quality of life.1 Worldwide, as of 2023, the current estimate of 50 million people worldwide with dementia is expected to increase to 78 million by 2030 and a staggering 139 million by 2050.2 The disease is characterized by several neuro-pathological features such as reduced levels of acetylcholine (ACh), accumulation of amyloid-β, formation of neurofibrillary tangles made of hyperphosphorylated tau-protein, oxidative stress, and imbalanced biometal levels.3 The current approach to treating neurological disorders involves the use of medication that aims to enhance cognitive functions or alleviate symptoms by targeting the mechanisms of neurotransmitters in the brain using cholinesterase inhibitors (such as donepezil, galantamine, and rivastigmine see Fig. 1) and N-methyl-D-aspartate (NMDA) receptor antagonist i.e. memantine.4,5 Patients with declining cognitive functions who are prescribed cholinesterase inhibitors or similar medications have not shown any significant improvement in preventing the advancement of AD.6 Despite ongoing efforts to develop drugs that modify the course of AD and slow its progression, there are still potential obstacles that may impede success, such as unanticipated toxicity or inadequate effectiveness in human clinical trials.7 The complexity of AD and its multifaceted nature have rendered the existing single-targeted drugs ineffective in producing the desired therapeutic effect. It is widely believed that compounds with the ability to modulate multiple targets are more effective than those that only act on a single target, due to the inadequate results of the one drug one target (ODOT) strategy. Therefore, there is a need for the development of multi-targeted therapies to slow down the progression of the diseaseItem Design, synthesis, in silico, and in vitro evaluation of pyrrol-2-yl-phenyl allylidene hydrazine carboximidamide derivatives as AChE/BACE 1 dual inhibitors(RSC, 2024-08) Jadhav, Hemant R.Alzheimer's disease (AD) manifests as a progressive decline in cognitive function and mental behavior. Targeting two crucial enzymes associated with AD, acetylcholinesterase (AChE) and BACE 1 (Beta-site APP Cleaving Enzyme), in combination, holds promise for therapeutic breakthroughs. In this study, 40 derivatives of pyrrol-2-yl-phenyl allylidene hydrazine carboximidamide were designed based on prior research. These derivatives underwent synthesis and assessment for their inhibitory potential against AChE and BACE 1. ADME predictions indicated favorable physicochemical properties for these compounds. The findings offer novel avenues for exploring the dual inhibition of AChE and BACE 1 as a promising therapeutic strategy for AD.Item Medicinal chemistry-based perspectives on thiophene and its derivatives: exploring structural insights to discover plausible druggable leads(RSC, 2025) Jadhav, Hemant R.Thiophene is a privileged pharmacophore in medicinal chemistry owing to its diversified biological attributes. The thiophene moiety has been ranked 4th in the US FDA drug approval of small drug molecules, with around 7 drug approvals over the last decade. The present review covers USFDA-approved drugs possessing a thiophene ring system. Our analysis reveals that 26 drugs possessing thiophene nuclei have been approved under different pharmacological classes. The review further covers reported thiophene and its substituted analogues with diverse biological activities, including anti-diabetic, anticancer, anti-inflammatory, anticonvulsant, and antioxidant activity. Besides, a section is dedicated to appreciating the implications of structural bioinformatics in drug discovery. Additionally, the manuscript delves into structure–activity relationship studies to explore the chemical groups responsible for eliciting potential therapeutic activities. The review may provide invaluable insights for researchers working with thiophene nuclei in developing novel analogues with greater efficacy and fewer side effects.Item Bioactivity predictions and virtual screening using machine learning predictive model(Taylor & Francis, 2024-01) Jadhav, Hemant R.Recently, there has been significant attention on machine learning algorithms for predictive modeling. Prediction models for enzyme inhibitors are limited, and it is essential to account for chemical biases while developing them. The lack of repeatability in available models and chemical bias issues constrain drug discovery and development. A new prediction model for enzyme inhibitors has been developed, and the model efficacy was checked using Dipeptidyl peptidase 4 (DPP-4) inhibitors. A Python script was prepared and can be provided for personal use upon request. Among various machine learning algorithms, it was found that Random Forest offers the best accuracy. Two models were compared, one with diverse training and test data and the other with a random split. It was concluded that machine learning predictive models based on the Murcko scaffold can address chemical bias concerns. In-silico screening of the Drug Bank database identified two molecules against DPP-4, which are previously proven hit molecules. The approach was further validated through molecular docking studies and molecular dynamics simulations, demonstrating the credibility and relevance of the developed model for future investigations and potential translation into clinical applications.Item Butadiene sulfone-catalyzed monobromination of arenes with nbs as the bromination source: a simple, mild, efficient, and chemoselective protocol(Bentham Science, 2024-02) Jadhav, Hemant R.In literature, dimethyl sulfoxide (DMSO) catalyzed bromination of arenes and heteroarenes is reported. In this study, simple, mild, and chemoselective N-bromosuccinimide (NBS) mediated monobromination of arenes and heteroarenes using butadiene sulfone as a catalyst is reported.Butadiene sulfone is a good substitute for DMSO as it is volatile, easy to recover and recycle, and environment- friendly. The method has been demonstrated to give high-yield brominated products for an extensive range of activated and deactivated arenes.Item Renoprotective effect of esculetin against ischemic acute kidney injury-diabetic comorbidity(Taylor & Francis, 2024-02) Gaikwad, Anil Bhanudas; Jadhav, Hemant R.Mitophagy maintains cellular homeostasis by eliminating damaged mitochondria. Accumulated damaged mitochondria can lead to oxidative stress and cell death. Induction of the PINK1/Parkin-mediated mitophagy is reported to be renoprotective in acute kidney injury (AKI). Esculetin, a naturally available coumarin, has shown protective action against diabetic complications. However, its effect on AKI-diabetes comorbidity has not been explored yet. Therefore, we aimed to investigate the renoprotective effect of esculetin against AKI under diabetic conditions via regulating PINK1/Parkin-mediated mitophagy. For this, type 1 diabetic male Wistar rats were treated with two doses of esculetin (50 and 100 mg/kg/day orally) for five days followed by AKI induction by bilateral ischemic-reperfusion injury (IRI). NRK-52E cells grown in high glucose were exposed to sodium azide (10 mM) for induction of hypoxia/reperfusion injury (HRI) in-vitro. Esculetin (50 µM) treatment for 24 h was given to the cells before HRI. The in-vitro samples were utilized for cell viability and ΔΨm assay, immunoblotting, and immunofluorescence. Rats’ plasma, urine, and kidney samples were collected for biochemical analysis, histopathology, and western blotting. Our results showed a significant decrease in kidney injury-specific markers and increased expression of mitophagy markers (PINK1 and Parkin) with esculetin treatment. Moreover, esculetin prevented the HRI and hyperglycemia-induced decrease in ΔΨm and autophagosome marker. Also, esculetin therapy reduced oxidative stress via increased Nrf2 and Keap1 expression. Esculetin attenuated AKI under diabetic condition by preventing mitochondrial dysfunction via inducing PINK1/Parkin-mediated mitophagy, suggesting its potential as an effective therapy for preventing AKI-diabetes comorbidity.Item Network pharmacology combined with molecular docking and dynamics to assess the synergism of esculetin and phloretin against acute kidney injury-diabetes comorbidity(Springer, 2024-04) Jadhav, Hemant R.; Gaikwad, Anil BhanudasAcute kidney injury (AKI) is a global health concern with high incidence and mortality, where diabetes further worsens the condition. The available treatment options are not uniformly effective against the complex pathogenesis of AKI–diabetes comorbidity. Hence, combination therapies based on the multicomponent, multitarget approach can tackle more than one pathomechanism and can aid in AKI–diabetes comorbidity management. This study aimed to investigate the therapeutic potential of esculetin and phloretin combination against AKI–diabetes comorbidity by network pharmacology followed by validation by molecular docking and dynamics. The curative targets for diabetes, AKI, esculetin, and phloretin were obtained from DisGeNET, GeneCards, SwissTargetPrediction database. Further, the protein–protein interaction of the potential targets of esculetin and phloretin against AKI–diabetes comorbidity was investigated using the STRING database. Gene ontology and pathway enrichment analysis were performed with the help of the DAVID and KEGG databases, followed by network construction and analysis via Cytoscape. Molecular docking and dynamic simulations were performed to validate the targets of esculetin and phloretin against AKI–diabetes comorbidity. We obtained 6341 targets for AKI–diabetes comorbidity. Further, a total of 54 and 44 targets of esculetin and phloretin against AKI–diabetes comorbidity were retrieved. The top 10 targets for esculetin selected based on the degree value were AKR1B1, DAO, ESR1, PLK1, CA3, CA2, CCNE1, PRKN, HDAC2, and MAOA. Similarly, phloretin’s 10 key targets were ACHE, CDK1, MAPK14, APP, CDK5R1, CCNE1, MAOA, MAOB, HDAC6, and PRKN. These targets were enriched in 58 pathways involved in the pathophysiology of AKI–diabetes comorbidity. Further, esculetin and phloretin showed an excellent binding affinity for these critical targets. The findings of this study suggest that esculetin and phloretin combination as a multicomponent multitarget therapy has the potential to prevent AKI–diabetes comorbidity.Item A structure-based pharmacophore modelling approach to identify and design new neprilysin (NEP) inhibitors: an in silico-based investigation(Elsevier, 2024-06) Gaikwad, Anil Bhanudas; Jadhav, Hemant R.Neutral endopeptidase or neprilysin (NEP) cleaves the natriuretic peptides, bradykinin, endothelin, angiotensin II, amyloid β protein, substance P, etc., thus modulating their effects on heart, kidney, and other organs. NEP has a proven role in hypertension, heart disease, renal disease, Alzheimer's, diabetes, and some cancers. NEP inhibitor development has been in focus since the US FDA approved a combination therapy of angiotensin II type 1 receptor inhibitor (valsartan) and NEP inhibitor (sacubitril) for use in heart failure. Considering the importance of NEP inhibitors the present work focuses on the designing of a potential lead for NEP inhibition. A structure-based pharmacophore modelling approach was employed to identify NEP inhibitors from the pool of 1140 chemical entities obtained from the ZINC database. Based on the docking score and pivotal interactions, ten molecules were selected and subjected to binding free energy calculations and ADMET predictions. The top two compounds were studied further by molecular dynamics simulations to determine the stability of the ligand-receptor complex. ZINC0000004684268, a phenylalanine derivative, showed affinity and complex stability comparable to sacubitril. However, in silico studies indicated that it may have poor pharmacokinetic parameters. Therefore, the molecule was optimized using bioisosteric replacements, keeping the phenylalanine moiety intact, to obtain five potential lead molecules with an acceptable pharmacokinetic profile. The works thus open up the scope to further corroborate the present in silico findings with the biological analysis.Item Design, synthesis and evaluation of new methyl piperazine derivatives as anticancer agents(Springer, 2024-07) Jadhav, Hemant R.To overcome the problem of side effects and toxicity, development of new anticancer agents is needed. Recently, piperidine salicylanilide derivatives with nanomolar epidermal growth factor receptor (EGFR) inhibitory and cytotoxicity activity have been reported. In the present study effect of replacing piperidine in reported piperidine salicylanilide with N-methyl piperazine and changing substituent’s of phenyl ring at other end on anticancer activity have been explored. A series of sixteen methyl piperazine incorporated phenyl benzamide and phenyl methanone derivatives have been synthesized and tested in a panel of three cancer cell lines (adenocarcinomic human alveolar basal epithelial cells (A-549), human colon carcinoma (HCT-116) and human pancreatic carcinoma (MIAPaCa-2)), using gefitinib as standard. Further, to study the probable mechanism, due to their structural similarity with EGFR inhibitors, docking interactions with EGFR active site were observed using Schrodinger suite.