Alkyl-Substituted Polyaminohydroxamic Acids: A Novel Class of Targeted Histone Deacetylase Inhibitors
作者:Sheeba Varghese、Deepak Gupta、Tiffany Baran、Anchalee Jiemjit、Steven D. Gore、Robert A. Casero,、Patrick M. Woster
DOI:10.1021/jm0505009
日期:2005.10.1
The reversible acetylation of histones is critical for regulation of eukaryotic gene expression. The histone deacetylase inhibitors trichostatin (TSA, 1), MS-275 (2) and suberoylanilide, hydroxamic acid (SAHA, 3) arrest growth in transformed cells and in human tumor xenografts. However, 1-3 suffer from lack of specificity among the various HDAC isoforms, prompting us to design and synthesize polyaminohydroxamic acid (PAHA) derivatives 6-21. We felt that PAHAs would be selectively directed to chromatin and associated histones by the positively charged polyamine side chain. At 1 mu M, compounds 12, 15 and 20 inhibited HDAC by 74.86, 59.99 and 73.85%, respectively. Although 20 was a less potent HDAC inhibitor than 1, it was more potent than 2, more effective as an initiator of histone hyperacetylation, and significantly more effective than 2 at re-expressing p21(Waf1) in ML-1 leukemia cells. On the basis of these results, PAHAs 6-21 represent an important new chemical class of HDAC inhibitors.