Effect of eIF4E on Autophagy of CD138 Cells in Multiple Myeloma / 中国实验血液学杂志

ABSTRACT

OBJECTIVE@#To investigate the effect of eukaryotic translation initiation factor 4E(eIF4E) on the autophagy of CD138 plasma cells in multiple myeloma(MM).@*METHODS@#Multiple myeloma CD138 plasma cells were treated with eIF4E inhibitor 4EGI, the changes of autophagy-related factors LC3-II and Beclin1 were detected by fluorescent quantitative PCR and Western blot, the changes of cell proliferation inhibition were detected by MTT assay, and cell apoptosis was detected by flow cytometry.@*RESULTS@#Quantitative fluorescence PCR showed that after treatment of myeloma cells with 4EGI, the expression levels of LC3-II and Beclin1 mRNA gradually increased with the enhancomer of 4EGI concentration and the prolongation of action time, and the differences were statistically significant (48 h LC3-Ⅱ,r=0.942, Beclin1,r=0.952; 80 μg/ml LC3-Ⅱ,r=0.966, Beclin1,r=0.998）; Western blot showed that with the enhancement of 4EGI concentration, the expression of LC3-II and Beclin1 protein gradually increased（LC3-Ⅱ,r=0.923, Beclin1,r=0.977）; CCK-8 showed that the inhibition rate of cells gradually increased （r=0.996）; the apoptotic rate of 4EGI-treated groups (23.23±4.47, 7.59±1.67, 2.03±0.19) was significantly different from that of control group (0.03±0.04) (P<0.05).@*CONCLUSION@#The inhibition of eIF4E can activate the autophagy of CD138 plasma cells in multiple myeloma and induce the death of myeloma cells.