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• W1986572043 abstract "Paclitaxel is an alternative chemotherapeutic agent for chronic myelogenous leukemia (CML) when primary or secondary resistance of tyrosine kinase inhibitors (TKI) is emerging, because paclitaxel could bypass the apoptotic deficiencies linked to p53 and fas ligand pathways in CML. However, high levels of Bcl-2 family proteins in CML could resist paclitaxel-induced apoptosis. Herein, we utilized two BH3 mimetics ABT-737 and S1 to study the potential of BH3 mimetics in combination with paclitaxel in treatment of CML cells and illustrated the mechanism by which BH3 mimetics synergize with paclitaxel. As a single agent, S1 could induce apoptosis in CML-derived cell line K562, whereas ABT-737 was largely ineffective. However, both of the two agents could efficiently synergize with paclitaxel through intrinsic apoptosis pathway. By using Bcl-2 siRNA, Bcl-XL siRNA or Mcl-1 siRNA, we found although each of the three members exhibited activities to block paclitaxel-induced apoptosis, Mcl-1 was the determinant for the synergistic effect between paclitaxel and ABT-737 or S1. Furthermore, paclitaxel/ABT737 synergized to drastically upregulate Bim to displace Bak from Mcl-1, whereas S1 directly binds Mcl-1 to release both Bim and Bak. As such, ABT-737 and S1 sensitized CML to paclitaxel by Mcl-1 inhibition, indirect inhibition through Bim antagonizing Mcl-1, or direct inhibition through binding to Mcl-1 itself. Finally, activation of JNK/Bim pathway was identified as the apical mechanism for ABT-737/paclitaxel synergism. Together, our results demonstrated potent synergy between BH3 mimetics and paclitaxel in the killing of CML cells and revealed an important role for Mcl-1 in mediating synergism by these agents." @default.
• W1986572043 created "2016-06-24" @default.
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• W1986572043 date "2015-04-01" @default.
• W1986572043 modified "2023-09-27" @default.
• W1986572043 title "Mechanism of synergy of BH3 mimetics and paclitaxel in chronic myeloid leukemia cells: Mcl-1 inhibition" @default.
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• W1986572043 doi "https://doi.org/10.1016/j.ejps.2015.01.003" @default.
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