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Synthesis and biological evaluation of 2-substituted-4-(3′,4′,5′-trimethoxyphenyl)-5-aryl thiazoles as anticancer agents

Romagnoli, Romeo, Baraldi, Pier Giovanni, Salvador, Maria Kimatrai, Camacho, M. Encarnacion, Preti, Delia, Tabrizi, Mojgan Aghazadeh, Bassetto, Marcella, Brancale, Andrea, Hamel, Ernest, Bortolozzi, Roberta, Basso, Giuseppe and Viola, Giampietro 2012. Synthesis and biological evaluation of 2-substituted-4-(3′,4′,5′-trimethoxyphenyl)-5-aryl thiazoles as anticancer agents. Bioorganic & Medicinal Chemistry 20 (24) , pp. 7083-7094. 10.1016/j.bmc.2012.10.001

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Abstract

Antitumor agents that bind to tubulin and disrupt microtubule dynamics have attracted considerable attention in the last few years. To extend our knowledge of the thiazole ring as a suitable mimic for the cis-olefin present in combretastatin A-4, we fixed the 3,4,5-trimethoxyphenyl at the C4-position of the thiazole core. We found that the substituents at the C2- and C5-positions had a profound effect on antiproliferative activity. Comparing compounds with the same substituents at the C5-position of the thiazole ring, the moiety at the C2-position influenced antiproliferative activities, with the order of potency being NHCH3 > Me ≫ N(CH3)2. The N-methylamino substituent significantly improved antiproliferative activity on MCF-7 cells with respect to C2-amino counterparts. Increasing steric bulk at the C2-position from N-methylamino to N,N-dimethylamino caused a 1–2 log decrease in activity. The 2-N-methylamino thiazole derivatives 3b, 3d and 3e were the most active compounds as antiproliferative agents, with IC50 values from low micromolar to single digit nanomolar, and, in addition, they are also active on multidrug-resistant cell lines over-expressing P-glycoprotein. Antiproliferative activity was probably caused by the compounds binding to the colchicines site of tubulin polymerization and disrupting microtubule dynamics. Moreover, the most active compound 3e induced apoptosis through the activation of caspase-2, -3 and -8, but 3e did not cause mitochondrial depolarization.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Pharmacy
Subjects: R Medicine > RM Therapeutics. Pharmacology
Uncontrolled Keywords: Tubulin; Thiazole; Combretastatin-A4; Colchicine site; Apoptosis
Publisher: Elsevier
ISSN: 0968-0896
Last Modified: 04 Jun 2017 04:32
URI: http://orca-mwe.cf.ac.uk/id/eprint/40768

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