Effects of RablA on proliferation and apoptosis of multiple myeloma cell line 8226 / 解剖学报

ABSTRACT

Objective To investigate the effect of RablA on proliferation and apoptosis of multiple myeloma (MM) cell line 8226. Methods The siRNA interference was used to knockdown RablA gene. The multiple myeloma cell line 8226 was divided into blank control group, negative control group and RablA siRNA group. In the blank control group, the multiple myeloma cells were not treated. Multiple myeloma cells 8226 in the negative control group were transfected with negative control siRNA. The RablA siRNA group was transfected with Rabl A-targeted siRNA. The effect of RablA on multiple myeloma cell 8226 proliferation was analyzed by colony forming test and cell counting kit-8 (CCK-8) assay. The apoptosis of multiple myeloma cell 8226 was detected by flow cytometry. Western blotting and Real-time PCR were used to observe the effect of RablA siRNA on the expression of c-Myc, cyclin D1, Bcl-2 and Bax. Results The expressions of RablA mRNA and RablA protein in the RablA siRNA group were significantly down-regulated compared with those in the negative control group. The result of colony formation and CCK-8 assay showed that RablA siRNA inhibit the proliferation of multiple myeloma cells 8226. The early and late apoptosis ratio of multiple myeloma cell 8226 in RablA siRNA group increased significantly compared with the negative control group (P<0.05). The expression of cyclin D1 and Bcl-2 in the RablA siRNA group were significantly down-regulated compared with the negative control group (P<0.05), and the expression of c-Myc and Bax were significantly up-regulated compared with the negative control group (P<0.05). Conclusion RablA may promote the proliferation of multiple myeloma cells 8226 by regulating the expression of c-Myc, cyclin Dl, Bcl-2 and Bax, while RablA siRNA can effectively inhibit the expression of RablA in rpmi-8226 cells, thereby inhibiting its proliferation and promoting apoptosis.