[Effect of Expression Interference on Daunorubicin Chemosensitivity of Chronic Myeloid Leukemia K562 Cells and Its Mechanism].

Objective: To investigate the effect of tripipartite motif 59 (TRIM59) expression interference on the chemosensitivity of daunorubicin (DNR) in chronic myeloid leukemia (CML) K562 cells and the related molecular mechanism.

Methods: The expressions of mRNA in bone marrow tissues of patients with CML and K562 cells were detected by RT-qPCR. Liposome-based transfection technology was used to transfect TRIM59-specific siRNA (si-TRIM59) into K562 cells which then were treated with DNR. The proliferation and apoptosis of cells were detected by CCK-8 assay and flow cytometry, respectively, and the expressions of apoptosis-related protein and Wnt/β-catenin signaling pathway-related protein were detected by Western blot.

Results: Compared with the bone marrow tissue of CML patients at the time of initial treatment, the expression of mRNA in bone marrow tissue of CML patients at the time of chemotherapy resistance was significantly increased ( <0.05). Compared with control group, the cell proliferation inhibition rate and apoptosis rate in si- group and DNR group were significantly increased ( <0.05), the expression of Bax, Caspase3 and Cleaved-Caspase3 protein were significantly increased ( <0.05), while the expressions of Bcl-2, Wnt3α, GSK-3β protein and the ratio of p-β-catenin/β-catenin were significantly decreased ( <0.05). Compared with si- group and DNR group, the proliferation inhibition rate and apoptosis rate of si-+DNR group were significantly increased ( <0.05), the expression of Bax, Caspase3 and Cleaved-Caspase3 protein were significantly increased, while the expression of Bcl-2, Wnt3α, GSK-3β protein and the ratio of p-β-catenin/β-catenin were significantly decreased ( <0.05).

Conclusion: expression interference may enhance the chemosensitivity of K562 cells to DNR, and its mechanism may be related to the regulation of Wnt/β-catenin signaling pathway.