3 years ago

Synthesis, biological evaluation and molecular modeling of imidazo[1,2-a]pyridine derivatives as potent antitubulin agents

Synthesis, biological evaluation and molecular modeling of imidazo[1,2-a]pyridine derivatives as potent antitubulin agents
Two series of novel 5,7-diarylimidazo[1,2-a]pyridine-8-carbonitrile derivatives (3a3q and 7a7n) were designed by modification of CA-4 pharmacophore to develop colchicine targeted antitubulin agents. All compounds were efficiently synthesized and evaluated for their cytotoxicity against five selected cancer cell lines (HT-29, H460, A549, MKN-45 and SMMC-7721) which got an insight in structure and activity relationships (SARs). Several molecules (7e, 7f, 7h7j and 7m) were disclosed to exhibit promising antiproliferative activity with IC50 values in double-digit nanomolar degree. Optimization toward these compounds led to the discovery of a promising lead 7e, which showed noteworthy potency with IC50 value ranging from 0.01 to 3.2µM superior to CA-4 and Crolibulin. Importantly, immunofluorescence staining and colchcine competitive binding assay revealed that microtubule dynamics was disrupted by 7e by binding at the colchicine site of tubulin. Moreover, molecular docking studies suggested the binding of this mimic at colchcine-binding site is similar to Crolibulin, as was in conformity with the observed SARs for these compounds.

Publisher URL: www.sciencedirect.com/science

DOI: S0968089617308210

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