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European Journal of Medicinal Chemistry 2010-Jul

Antitumor activity of (-)-alpha-bisabolol-based thiosemicarbazones against human tumor cell lines.

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Alan P da Silva
Manuele V Martini
Cecília M A de Oliveira
Silvio Cunha
João E de Carvalho
Ana L T G Ruiz
Cleuza C da Silva

Keywords

Abstract

A series of thiosemicarbazones deriving from the natural sesquiterpene (-)-alpha-bisabolol were synthesized and tested against a panel of eight human tumor cell lines to evaluate their anti-tumor potential. Some of the compounds exhibited inhibitory effects on the growth of a wide range of cancer cell lines, but myeloid leukemia cells (K-562) were especially sensitive to all tested thiosemicarbazones (GI(50) 0.01-4.22 microM). Among the analogues, the ketone derivative 3l was the most active, exhibiting potent antitumoral activity (GI(50) 0.01 microM) and high selectivity for K-562 cells (deltaTGI 505). It also demonstrated high cytotoxicity, with an LC(50) of 1.55 microM for the K-562 cells, but it showed only moderate selectivity (deltaLC(50) 38.5 microM). Through structure-activity relationship studies, we identified some structural requirement for the antitumoral activity exhibited by these promising compounds.

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