Abstract: Objective: To investigate the change of apoptosis protein (Caspase 3) expression when RNA binding motif protein 3 (RBM3) overexpression in swine testicle (ST) cell line under cold stress (32℃) condition. Methods: In present study, RBM3 overexpression lentiviral vector (pLenti6/V5-GW/EmGFP-RBM3) and empty viral vector (pLenti6/V5-GW/EmGFP-DEST) with green fluorescent protein (GFP) that were successfully constructed in our laboratory were transfected into ST cells as overexpression virus group (OEV), empty vector virus (EVV) group and establishment of wildtype cell (WTC) group as the control group. The real-time fluorescence quantitative RCR (qPCR) and Western blot were used to detect expression of RBM3 mRNA and protein in each group, then cells in each group were cultured at 37℃ or 32℃ (2 h, 4 h, 8 h), the changes of Caspase 3 expression in each group were detected by enzyme linked immunosorbent assay (ELISA). Results: Relative RBM3 gene and protein expression in OEV group were significantly higher than those in EVV group and WTC group. At the temperature of 37℃ and at 32℃ (2 h, 4 h, 8 h) in cold stress experiment, Caspase 3 expression in OEV group was significantly lower than those in EVV group and WTC group. Conclusion: RBM3 overexpression in ST cell line exposured to cold can significantly decreased the level of Caspase 3 expression, this study provides an experimental basis of RBM3 resistance against apoptosis of ST cells induced by low temperature.

Key words: RNA binding motif protein 3, cold stress, overexpression, swine testicular cell line, Caspase 3