C1206, a novel curcumin derivative, potently inhibits Hsp90 and human chronic myeloid leukemia cells in vitro

• 来源期刊: 中国药理学报（英文版）
• 关键词: curcumin derivative Hsp90 inhibitor anticancer drug ATPase activity apoptosis mitochondria chronic myeloid leukemia K562 cells K562/G01 cells
• 年，卷（期）: 2018,（4）
• 页码范围: 649-658
• 页数: 10页
• 语种: 英文
• DOI: 10.1038/aps.2017.160

摘要

4-(4-Pyridinyl methylene) curcumin (C1206) is a new derivative of curcumin that is more active than curcumin in inhibition of heat shock protein 90 (Hsp90) and antitumor action.In this study we investigated the relationship between C1206-induced inhibition of Hsp90 and its anti-leukemic effects.The fluorescence quenching experiments showed that C1206 seemed to bind the middle dimerization domain of Hsp90.The interaction between C1206 and Hsp90 was driven mainly by electrostatic interaction.In in vitro enzyme activity assay,C1206 dose-dependently inhibited Hsp90 ATPase activity with an IC50 value of 4.17 μmol/L.In both imatinibsensitive K562 chronic myeloid leukemia cells and imatinib-resistant K562/G01 chronic myeloid leukemia cells,C1206 (0.4-3.2μmol/L) dose-dependently caused the degradation of Hsp90 client proteins and downstream proteins (AKT,MEK,ERK,C-RAF,P-AKT,P-MEK and P-ERK).Furthermore,C1206 (0.4-3.2 μmoVl/) dose-dependently induced apoptosis of K562 and K562/G01 cells through triggering mitochondrial pathway.Consistent with this result,C1206 inhibited the proliferation of K562 and K562/G01 cells with IC50 values of 1.10 and 0.60 μmol/L,respectively.These results suggest that C1206 is a novel Hsp90 inhibitor and a promising therapeutic agent for chronic myeloid leukemia.