Synthesis and in vitro antitumor activity of new 4,5-dihydropyrazole derivatives |
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Authors: | Cenzo Congiu Valentina Onnis Loredana Vesci Massimo Castorina Claudio Pisano |
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Institution: | 1. Dipartimento di Tossicologia, Sezione di Chimica Farmaceutica, Università degli Studi di Cagliari, via Ospedale 72, Cagliari I-09124, Italy;2. R&D, Sigma-Tau Industrie Farmaceutiche Riunite S.p.A., Pomezia, Italy |
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Abstract: | A series of 3,5-diaryl-4,5-dihydropyrazole regioisomers, and their 1-acetylated derivatives, bearing a 3,4,5-trimethoxyphenyl moiety combined with a variety of substituted phenyl rings, was synthesized and evaluated for antitumor activity. Results of the in vitro assay against a non-small cell lung carcinoma cell line (NCI-H460) showed several compounds to be endowed with cytotoxicity in micromolar to sub-micromolar range, depending on substitution pattern and position of aryl rings on 4,5-dihydropyrazole core. Potent and selective activity was also observed in the NCI 60 human cancer cell line panel. 5-(3,4,5-Trimethoxyphenyl)pyrazolines 31 and 39 were found to possess potent antiproliferative activity against SR and MDA-MB-435, with GI50 inhibitory values in nanomolar range. Structure–activity relationships revealed that introduction of a (hydroxy)acetyl group at N-1 of inactive 5-(3,4,5-trimethoxyphenyl)pyrazolines, results in a clear in vitro activating effect. Compound 31 (IC50 = 5.16 μM) showed inhibition of tubulin polymerization comparable to that of CA-4 (IC50 = 4.92 μM). |
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