Effect Of GRP94 Expression Down-Regulation On Proliferation Abilities Of Human Lung Carcinoma A549 Cells

Objective:To investigate the effect of GRP94 gene expression down-regulation on the proliferation in human lung carcinoma A549 cells and possible mechanism. Methods:Expression of GRP94 was examined in 4 lung carcinoma cells and two Lung bronchial epithelial cells by qRT-PCR and western blot. Chemically synthesized siRNA targeting GRP94 gene and transfected into A549 cells used by Liopfectamine2000. The mRNA and protein expression levels of GRP94, c-myc and cyclinD1 were detected by qRT-PCR and Western blotting. CCK8 assay and Colony formation assay were used to detect the effect of specific GRP94 siRNA on cell proliferation. Results:The levels of GRP94 expression in the fourlung carcinoma cells were significantly higher than that in two Lung bronchial epithelial cells (P<0.05). GRP94 siRNA significantly downregulated the levels of GRP94 mRNA and protein in A549 cells, and the downregulation evidently suppressed cell proliferation. However, The c-myc and cyclinD1 expression levels in A549 cells in siRNA-GRP94group was significantly lower than that in siRNA-NC group (P<0.05).Conclusion:The levels of GRP94 expression in lung carcinoma cells were significantly higher than that in normal lung epithelial cells. Knockdown GRP94 expression significantly inhibit the level of lung carcinoma A549 cells proliferation, which may act via influencing the expression of c-myc, cyclinD1.