【摘要】 目的 :研究脂多糖 (LPS)刺激人血管内皮细胞 (HVEC)分泌内皮素 - 1(ET - 1)与肾上腺髓质素 (Adm)的机制。方法 :在培养的HVEC上 ,用放射免疫法测定不同浓度LPS刺激HVEC分泌的ET - 1与Adm ,以及不同的细胞信号转导阻断剂对其分泌的影响。结果 :LPS呈时间和浓度依赖性地增加HVEC分泌ET - 1和Adm ,ET - 1/Adm比值与对照组比较无明显差异 (P >0 0 5 )。在LPS刺激基础上 ,细胞外信号调节激酶 (ERKs)抑制剂PD0 980 59和P38蛋白激酶抑制剂SB2 0 2 190 可明显降低LPS刺激HVEC分泌ET - 1(P <0 0 1) ,仅SB2 0 2 190 显著降低Adm的分泌 (P <0 0 5 ) ,其余PKC抑制剂H7,钙调素 (CaM)抑制剂W7,Ca2 + 阻断剂nicardipine,钙调神经磷酸酶 (CaN)抑制剂环孢霉素 (CsA)对LPS刺激HVEC分泌ET - 1和Adm均无明显影响 (P >0 0 5 )。结论 :LPS刺激HVEC分泌ET - 1可能与ERKs和P38两条途径有关 ,LPS刺激HVEC分泌Adm只与P38信号通路有关 ,两者均不取决于PKC、Ca2 + 、CaM、CaN依赖的信号通路。更多还原

【Abstract】 AIM: To study lipopolysaccharide (LPS)-stimulated secretion of endothelin-1 (ET-1) and adrenomedullin (Adm) from human vascular endothelial cells (HVEC) and its mechanism. METHODS: In cultured HVEC, LPS was used to stimulate ET-1 and Adm secretion from HVEC. The contents of ET-1 and Adm in medium were determined by radioimmunoassay. RESULTS: LPS stimulated secretion of ET-1 and Adm from HVEC in time-dependent and concentration-dependent manner. The ratio of secreted ET-1 to Adm was not changed compared with the control group. The increase of ET-1 could be inhibited by inhibitor of extracellular signal-regulated protein kinases (PD 098059 ) and inhibitor of P38 kinase (SB 202190 )( P< 0.01), while the increase of Adm could only be inhibited by SB 202190 ( P< 0.05), both had no response to inhibitor of protein kinase C (H 7), inhibitor of calmodulin (W 7), inhibitor of calcineurin (cyclosporin A) and inhibitor of Ca 2+ (nicardipine)( P> 0.05).CONCLUSION: ERKs and P38 signal pathways may play an important role in the secretion of ET-1 from LPS -stimulated HVEC, while only P38 kinase signal pathway is invovled in the secretion of Adm.更多还原