Figure 3. Effect of calretinin on the apoptosis of Leydig cells. (A) The calretinin expression in the MLTC-1 cells transfected with LV-calb2 was significantly higher (B) The calretinin expression in R2C cells transfected with LV-siRNA-calb2 was significantly lower. (C) The number of apoptotic cells were significantly decreased in MLTC-1 cells with up-regulated calretinin. (D) The apoptotic cells were significantly increased in R2C cells with down-regulated calretinin. (E) In MLTC-1 cells transfected with LV-calb2, the apoptotic index was significantly decreased when compared with the control group. (F) In R2C cells transfected with LV-siRNA-calb2, the apoptotic index was significantly higher when compared with the control group. The vector was used as the negative control(s). *: p<0.05; ***: p<0.001.