A Combined Chemoinformatics- and Machine Learning-Based Approach Identifies Chlormidazole as a Drug Repurposing Candidate against Aggressive Prostate Cancer
Aug 2026· Journal of Medicinal Chemistry· Vol 69, pp. 17944 - 17960· 0 citations· 68 references
Medicine
TL;DR
An integrated chemoinformatics and machine learning workflow with ligand-based similarity filtering is developed and prospectively validated, identifying chlormidazole as a promising repurposing candidate for PCa and demonstrating the value of integrating chemoinformatics with ML for drug repurposing and virtual screening.
Abstract
Despite recent therapeutic advances, treatment options for advanced, therapy-resistant, and metastatic prostate cancer (PCa) remain limited. Here, we developed and prospectively validated an integrated chemoinformatics and machine learning (ML) workflow with ligand-based similarity filtering. Validation on independent external data sets showed that this applicability-domain-guided integration strategy can reduce false positives and improve virtual screening performance. Screening of DrugBank identified five repurposing candidates with confirmed antiproliferative activity in both 2D and 3D PCa models. Among them, the antifungal agent chlormidazole emerged as the most promising candidate, displaying tumor-selective and predominantly cytostatic activity associated with p57 upregulation, reduced Rb phosphorylation, and G1 arrest. Chlormidazole also enhanced the antiproliferative activity of docetaxel in both models, achieving comparable efficacy at substantially lower docetaxel concentrations. These findings identify chlormidazole as a promising repurposing candidate for PCa and demonstrate the value of integrating chemoinformatics with ML for drug repurposing and virtual screening.
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Colorectal-cancer (CRC) is the third leading cause of mortality due to cancer, thus there is a need for innovative-therapeutic-agents to enhance the efficacy of current treatments and improve outcomes. Here we performed different machine learning (MI) approaches (e.g., random forest, support vector machines, convolutional neural networks, CNN,…), with capable of handling the complex relationship between target markers, and CRC were utilized to select an approapriate with higher efficancy agent and then investigated the therapeutic impact of PGP in CRC. RNAseq and the integrative systems biology technique followed by MI algoritisms were applied to identify differentially expressed genes (DEGs) followed by validation in a large cohort of patients and then PGP was selected for in vitro and in vivo studies. Antiproliferative-activity of (Punica granatum var. pleniflora (PGP)) was tested in 2 and 3D cell-culture models. The effect of PGP on migratory-behaviors and apoptosis was determined using a wound-healing-assay and AnnexinV/PI staining, respectively. The expression were assessed using q-RT-PCR. Molecular-Pathology and histopathological-assessment was used followed by evaluation of oxidative-stress-markers. Metabolomics for assessment of chemical and active components of the PGP extract were determined by LC-MS/MS. The result illustrated a total of 856 upregulated/downregulated-genes in patients. Among the high top-score genes, fibrotic/inflammatory pathways were detected and further validated in 65 patients. PGP inhibited cell-growth and migration in cells by modulating CyclinD1, Survivin, and E-cadherin. Furthermore, PGP increased apoptosis. Moreover, PGP significantly decreased tumor-size in an animal-xenograft CRC via perturbation of fibrosis-markers, Col1A/ACTA2. PGP reduced inflammation, and oxidative-stress via modulation of SOD/Cat/total thiol. Phytochemical profiling showed a total of 28 and 43 compounds including Corilagin, Ellagic acid, Gallic Acid and Quercetin-hexoside, which have anti-cancer properties. The results demonstrated the therapeutic potential of PGP in tumor-growth reduction, indicating its potential value as a new approach in the treatment of colorectal-cancer.
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