三七总皂苷对烫伤后核因子—κB及肿瘤坏死因子的影响

目的观察不同剂量的三七总皂苷对严重烫伤小鼠腹腔巨噬细胞内核因子-κB(NF-κB)活性及肿瘤坏死因子(TNF-α)mRNA的影响，阐明三七总皂苷对巨噬细胞分泌TNF-α影响的机制，探索体外运用该药的最佳剂量。方法以15%体表面积Ⅲ度烫伤小鼠为模型，收集腹腔巨噬细胞，电泳迁移率改变分析法测NF-κB的活性，反转录PCR测TNF-αmRNA的表达。结果烫伤后巨噬细胞内NF-κB活性与TNF-αmRNA的表达均显著升高，三七总皂苷在一定的浓度范围内呈剂量依赖性的抑制NF-κB活性与TNF-αmRNA的表达，以0.8mg*mL-1的剂量最明显，两者变化趋势相类似。结论三七总皂苷可能通过抑制NF-κB活性而降低TNF-αmRNA的表达。

The Effects of Total Saponins of Panax Notogineseny (PNS) on NF-

Objective:To explore the mechanism of total saponins of panax notogineseny (PNS) on secretion of TNF-α by macrophages and optimal dosage of PNS in vitro, through observation of the effects of different PNS dosages on nuclear factor-κB (NF-κB) activity and TNF-α mRNA expression of murine peritoneal macrophages (PMΦs) after severe scald.　Methods: The experimental model of 15% TBSA full-thickness scalded mice with vapor was used and PMΦ collected. NF-κB activity was measured by EMSA and TNF-α mRNA by RT-PCR. 　Results: There was a significant increase of the NF-κB activity and TNF-α mRNA expression in the PMΦs following scald, which was inhibited by application of PNS. It was also found that the effects of PNS was dosage-dependent within a certain range of concentrations, with the inhibition effect most obvious at 0.8 mg*mL-1.　Conclusion:PNS probably decreases TNF-α mRNA expression by inhibiting the NF-κB activity of PMΦs.