1. X-ray Crystallography-Guided Design, Antitumor Efficacy, and QSAR Analysis of Metabolically Stable Cyclopenta-Pyrimidinyl Dihydroquinoxalinone as a Potent Tubulin Polymerization Inhibitor
- Author
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Lingling Ma, Yuxi Wang, Lei Yang, Foyez Mahmud, Duane D. Miller, Stephen W. White, Shanshan Deng, Hao Chen, Keyur Parmar, Wei Li, Sayo O. Fakayode, Bernd Meibohm, Souvik Banerjee, Kinsie E. Arnst, Pradeep B. Lukka, Zhongzhi Wu, and Mi-Kyung Yun
- Subjects
Male ,Quantitative structure–activity relationship ,Cell Survival ,Quantitative Structure-Activity Relationship ,Antineoplastic Agents ,Apoptosis ,Pharmacology ,Crystallography, X-Ray ,Article ,Mice ,chemistry.chemical_compound ,In vivo ,Cell Line, Tumor ,Quinoxalines ,Drug Discovery ,medicine ,Animals ,Humans ,Colchicine ,Potency ,biology ,Melanoma ,Cell Cycle ,medicine.disease ,Xenograft Model Antitumor Assays ,Small molecule ,Tubulin Modulators ,Tubulin ,chemistry ,Drug Resistance, Neoplasm ,Cell culture ,Drug Design ,biology.protein ,Molecular Medicine ,Female - Abstract
Small molecules that interact with the colchicine binding site in tubulin have demonstrated therapeutic efficacy in treating cancers. We report the design, syntheses, and antitumor efficacies of new analogues of pyridopyrimidine and hydroquinoxalinone compounds with improved drug-like characteristics. Eight analogues, 5j, 5k, 5l, 5m, 5n, 5r, 5t, and 5u, showed significant improvement in metabolic stability and demonstrated strong antiproliferative potency in a panel of human cancer cell lines, including melanoma, lung cancer, and breast cancer. We report crystal structures of tubulin in complex with five representative compounds, 5j, 5k, 5l, 5m, and 5t, providing direct confirmation for their binding to the colchicine site in tubulin. A quantitative structure–activity relationship analysis of the synthesized analogues showed strong ability to predict potency. In vivo, 5m (4 mg/kg) and 5t (5 mg/kg) significantly inhibited tumor growth as well as melanoma spontaneous metastasis into the lung and liver against a highly paclitaxel-resistant A375/TxR xenograft model.
- Published
- 2021