Effect on proliferation and apoptosis of retinoblastoma cell by RNA inhibiting high mobility group protein box-1 expression.

Aim: To investigate the effect of high mobility group protein box-1 (HMGB1) siRNA on proliferation and apoptosis of retinoblastoma (Rb) cells.

Methods: The expression of HMGB1 in Rb cells were detected by real-time polymerase chain reaction (RT-PCR) and Western blot. Chemically synthesized HMGB1 siRNA was transfected into Y79 cells. The inhibitory rate was also examined by RT-PCR and Western blot. After HMGB1 siRNA transfection, the cell proliferation was analyzed by MTT, and cell apoptosis was detected by Caspase-3 active detection kit. Cell cycle distribution and apoptosis were detected by flow cytometry.

Results: The expression of HMGB1 significantly elevated in Rb cells (<0.01). After transfected by siRNA, the HMGB1 protein level of Y79 cells was significantly reduced (<0.01). After siRNA interference HMGB1, the proportion of proliferating cells reduced, and the proportion of quiescent cells increased (<0.05). In addition, apoptosis rate of Y79 cells increased from 2.03% to 9.10% after interfering with HMGB1 siRNA (<0.05).

Conclusion: Specific HMGB1 siRNA can inhibit the expression of HMGB1. The effect may be attributed to inhibit the proliferation and promote cell apoptosis.