TY - JOUR AU - FAN Ying-juan AU - ZHOU Yi-xiang AU - ZHANG Lian-ru AU - LIN Qiao-fa AU - GAO Ping-zhang AU - CAI Fang AU - ZHU Li-ping AU - LIU Bi AU - XU Jian-hua PY - 2018 TI - C1206, a novel curcumin derivative, potently inhibits Hsp90 and human chronic myeloid leukemia cells in vitro JF - Acta Pharmacologica Sinica; Vol 39, No 4 (April 2018): Acta Pharmacologica Sinica(Special Feature:Exosomes) Y2 - 2018 KW - N2 - Abstract 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 IC 50 value of 4.17 μmol/L. In both imatinibsensitive K562 chronic myeloid leukemia cells and imatinib-resistant K562/G 01 chronic myeloid leukemia cells, C1206 (0.4–3.2 μmol/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 μmol/L) dose-dependently induced apoptosis of K562 and K562/G 01 cells through triggering mitochondrial pathway. Consistent with this result, C1206 inhibited the proliferation of K562 and K562/G 01 cells with IC 50 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. UR - http://www.chinaphar.com/article/view/9767