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Bioorg Med Chem Lett. 2013 Sep 15;23(18):5140-4. doi: 10.1016/j.bmcl.2013.07.016. Epub 2013 Jul 19.

Discovery of N-(2,3,5-triazoyl)mycophenolic amide and mycophenolic epoxyketone as novel inhibitors of human IMPDH.

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Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.


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 I and 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 μM. These observations suggest that the primary target of 4, 9, and 10 is IMPDH, whereas compound 9 partially inhibits a certain type of HDAC.


Erythroid differentiation; Histone deacetylase (HDAC); Inosine-5′-monophosphate dehydrogenase (IMPDH); Mycophenolic acid; Mycophenolic hydroxamic acid

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