The effects of magnesium sulfate on fetal rats of FGR and the expression of caspase-3 in the placenta of maternal rat.

To investigate the effect of magnesium sulfate on the fetal rats of FGR and the expression of caspase-3 in the placenta of maternal rat; To explore the mechanism of using magnesium sulfate to cure the FGR. Establish model of FGR by a way of passive smoking: giving the maternal rats different agent of magnesium sulfate by subcutaneous injection: low agent group (300 mg/kg), high agent group (600 mg/kg). Concentration of magnesium sulfate was monitored. The expression of caspase-3 was measured by RT-PCR and immunohistochemistry technology. Both of the concentrations of magnesium sulfate in high and low agents group are higher than the FGR group (P < 0.01); the weight of the placenta and fetal rat in high agent group are higher than the FGR group (P < 0.05 and P < 0.01); the expression of mRNA and protein of caspase-3 in the two agent group is higher than the FGR group (P < 0.05 respectively); concentration of magnesium sulfate in the maternal rat blood correlate to the weight of fetal rat (r = 0.899, P = 0.038) and the expression of caspase-3 in the placenta of maternal rat (r = -0.747, P = 0.033; r = - 0.915, P = 0.001). The research suggests that the weight of fetal rat could be increased by treatment of magnesium sulfate. Because it would imfrmove the placental function by depressing the expression of caspase-3.