Discovery of N-(2,3,5-triazoyl)mycophenolic amide and mycophenolic epoxyketone as novel inhibitors of human IMPDH
作者:Kazuhiro Sunohara、Shinya Mitsuhashi、Kengo Shigetomi、Makoto Ubukata
DOI:10.1016/j.bmcl.2013.07.016
日期:2013.9
Syntheses of ten derivatives of mycophenolic acid (MPA) at C-6' position, and structure-activity relationship study among these derivatives, MPA and mycophenolic hydroxamic acid (MPHA) led to discovery of N-(2,3,5-triazolyl)mycophenolic amide 4, (7'S) mycophenolic epoxyketone 9 and (7'R) mycophenolic epoxyketone 10 having potent inhibitory activity against human inosine-5'-monophosphate dehydrogenase (IMPDH) type land II as well as antiproliferative activity on human leukemia K562 cells. Compounds 4, 9, and 10 showed induction activity of erythroid differentiation in K562 cells. Inhibitory effects of 4 and 10 against IMPDH were attenuated by supplemental guanosine in K562 cells. In contrast, attenuation effect by supplemental guanosine was not significant in the case of 9. Compound 9 weakly inhibited the enzyme activity of HDAC in the nuclear lysate of K562 cells at 10 mu M. These observations suggest that the primary target of 4, 9, and 10 is IMPDH, whereas compound 9 partially inhibits a certain type of HDAC. (C) 2013 Elsevier Ltd. All rights reserved.