白芍总苷对巨噬细胞核转录因子-κB活化的影响及其机制研究

目的:研究白芍总苷(TGP)对核转录因子-κB(NF-κB)活化的调节作用及其机制。方法:不同剂量(10,30,100,300μg.mL^-1)的TGP作用于大鼠腹腔巨噬细胞2 h后,加入脂多糖(LPS)刺激20 min或1 h,Westernblot方法分别观察NF-κB抑制蛋白IκBα在胞浆中的含量及NF-κB亚基p65在胞核中的含量,同时检测NF-κB与DNA的结合活性。结果:TGP显著增加了LPS刺激后的巨噬细胞胞浆中IκBα蛋白的含量,同时显著减少了胞核中NF-κB p65蛋白含量,并对LPS诱导的NF-κB与DNA的结合活性也有明显抑制作用。结论:TGP可抑制LPS诱导的巨噬细胞NF-κB的活化,其机制与TGP抑制IκBα蛋白的降解,阻遏NF-κB p65蛋白的核转移和抑制NF-κB与DNA的结合密切相关。

Effect of total glucosides of paeony on nuclear factor-κB activation in rat peritoneal macrophages

OBJECTIVE: To study the effect of total glucosides of paeony (TGP) on lipopolysaccharides (LPS)-induced nuclear factor-kappaB (NF-kappaB) activation in macrophages. METHOD: Rat peritoneal macrophages were pre-treated with TGP for 2 h and stimulated with LPS for 20 min or 0.5 h. Inhibitory kappaBalpha (IkappaBalpha) protein in the cytoplasm and NF-kappaB p65 protein in the nuclear were analyzed by western blot. Further, DNA binding activity of NF-kappaB complex was detected. RESULT: TGP enhanced the amounts of IkappaBalpha protein in the cytoplasm and decreased the amounts of NF-kappaB p65 protein in the nuclear of LPS-induced macrophages. TGP also inhibited the LPS-mediated DNA binding activity of NF-kappaB complex in macrophages. CONCLUSION: TGP can inhibit LPS-induced NF-kappaB activation in macrophages through arresting IKBalpha protein degradation, NF-kappaB p65 protein nuclear translocation and DNA binding activity of NF-kappaB complex.