Development of hypoxia-inducible factor (HIF)-1α inhibitors: Effect of ortho-carborane substituents on HIF transcriptional activity under hypoxia
作者:Hiroyuki Nakamura、Yuka Yasui、Minako Maruyama、Hidemitsu Minegishi、Hyun Seung Ban、Shinichi Sato
DOI:10.1016/j.bmcl.2012.11.081
日期:2013.2
A series of substituted ortho-carboranylphenoxyacetanilides were synthesized and evaluated for their ability to inhibit hypoxia-induced HIF-1 transcriptional activity using a cell-based reporter assay in HeLa cells expressing the HRE-dependent firefly luciferase reporter construct (HRE-Luc) and constitutively expressing CMV-driven Renilla luciferase reporter, and their ability to inhibit cell growth (GI(50)) using the MTT assay. Among the compounds synthesized, 1g and 1l showed significant inhibition of hypoxia-induced HIF-1 transcriptional activity (IC50: 1.9 +/- 0.4 and 1.4 +/- 0.2 mu M, respectively). Both compounds suppressed HIF-1 alpha accumulation in a concentration-dependent manner. The porcine heart malate dehydrogenase (MDH) refolding assay revealed that compound 1l inhibited human Hsp60 chaperone activity (IC50: 6.80 +/- 0.25 mu M) and this inhibition activity was higher than that of ETB (IC50: 10.9 +/- 0.63 mu M). (c) 2012 Elsevier Ltd. All rights reserved.