【摘要】 目的:观察硫酸化八肽胆囊收缩素(sCCK -8)对TNF-α诱导大鼠滑膜细胞株RSC -364 IL-6mRNA表达及核因子NF-κB的影响及其可能的受体机制。方法:大鼠滑膜细胞株RSC -364经TNF-α(10μg/L)、sCCK-8(10-8-10-6mol/L)、CCK受体拮抗剂丙谷胺(2 mg/L)及溶剂单独或联合孵育3 h,用RT-PCR检测细胞IL-6、CCK-AR及CCK-BR mRNA的表达,孵育1 h,用电泳迁移率检测NF-κB活性,孵育30min,用Western blot-ting检测胞浆IκB蛋白表达。结果:RSC -364细胞固有表达CCK-A/B受体,sCCK-8(10-8-10-6mol/L)使IL-6、CCK-AR和CCK-BR mRNA表达进一步增高,明显增加TNF-α诱导的NF-κB活性,降低胞浆中IκB蛋白水平,并可被丙谷胺所拮抗。结论:sCCK-8通过NF-κB途径上调TNF-α诱导的大鼠滑膜细胞IL-6 mRNA表达,此作用可能通过滑膜细胞上的CCK受体实现,提示CCK-8在类风湿性关节炎(RA)发病过程中可能具有调控作用。更多还原

【Abstract】 AIM:To investigate the effect of sulfated cholecystokinin octapeptide(CCK-8) on TNF-α induced IL-6 mRNA expression,NF-κB activation in the rat fibroblast-like synovial cell strain RSC-364 and its possible receptor mechanisms.METHODS:RSC-364 cells were stimulated with TNF-α(10 μg/L) in the presence or absence of sCCK-8(10-8-10-6 mol/L) or/and CCK receptor antagonist proglumide(2 mg/L).IL-6 and CCK receptor A/B(CCK-AR/CCK/BR) mRNA expression were assayed by reverse transcription polymerase chain reaction(RT-PCR) at 3 h after stimulation,and nuclear factor-κB(NF-κB) binding activity was analyzed by electrophoretic mobility shift assay(EMSA) at 1h after stimulation.At 30 min of stimulation the IκB protein level in cytoplasma was measured by Western blotting.RESULTS:Both CCK-AR and CCK-BR were constitutively expressed on RSC-364.sCCK-8,at concentrations from 10-8 mol/L to 10-6 mol/L,significantly increased IL-6 mRNA expression,CCK-AR and CCK-BR mRNA expression,NF-κB binding activity and IκB protein degradation.The effects of sCCK-8 on NF-κB activity and IκB degradation level were attenuated by CCK receptor antagonist proglumide.CONCLUSION:sCCK-8 upregulats TNF-α-induced IL-6 mRNA expression by NF-κB pathway through its receptor on rat synoviocytes,suggesting its possible regulatory role in the pathogenesis of rheumatoid arthritis.更多还原