硝普钠对核因子κB活性影响的初步研究

Effect of sodium nitroprusside on activation of nuclear factor κB

目的 :探讨不同浓度的硝普钠 (SNP)对人外周血T淋巴细胞核因子kappaB(NF -κB)活性的影响及机制。方法 :应用人外周血T淋巴细胞培养、Westernblot和RT -PCR等技术 ,观察不同浓度的一氧化氮 (NO)供体SNP对人T细胞受植物血凝素 (PHA -P)刺激 30min、12 0min后IκBαmRNA和蛋白质表达的影响。结果 :中高浓度的SNP能显著减少PHA -P刺激 30min时IκBα 蛋白的降解 ,并明显增加刺激 12 0min时IκBαmRNA的再表达。结论 :中高浓度的SNP抑制NF -κB活性的机制与其通过NO减少IκBα 降解、促进IκBα 再合成有关 ,而低浓度SNP对NF -κB活性影响的机制可能不是通过IκBα。

AIM: To investigate the effect of sodium nitroprusside (SNP) on activation of nuclear factor κB. METHODS: The techniques of culture of human T lymphocytes, Western blot and RT-PCR were applied. The effects of NO donor sodium nitroprusside (SNP) at different concentrations on mRNA and protein expression of IκB α in human T lymphocytes at 30 min or 120 min after stimulating with phytohaemagglutinin (PHA-P) were observed. RESULTS: SNP at middle or high concentrations reduced the degradation of IκB α protein 30 min after stimulating with PHA-P, and increased the re-expression of IκB α mRNA 120 min after stimulating with PHA-P significantly. CONCLUSION: The mechanism of inhibitory effect of SNP at middle or high concentrations may be due to the decrease in degradation and the increase in re-synthesis of IκB α. The regulatory mechanism of SNP at low concentration may not be through IκB α.