首页> 中文期刊> 《中国急救医学》 >CGA 衍生多肽 CHR 抑制 TNF -α引起的血管内皮细胞高通透性的研究

CGA 衍生多肽 CHR 抑制 TNF -α引起的血管内皮细胞高通透性的研究

         

摘要

Objective To explore the role of Chromogranin A ( CGA ) derived peptide CGA47-66 (Chromfungin, CHR) on TNF-αinduced hyperpermeability in vascular endothelial cells . Methods Human umbilical venous endothelial cell line ( EA.hy926 cells) was exposed respectively to CHR, TNF -α.Transwell assay, PCR and Western -blot were respectively performed to detect permeability of monolayer endothelial cells , expression of VE-cadherin mRNA and proteins , as well as expressions of permeability -related proteins such as phosphorylated p 38 MAPK and total p38 MAPK. Results Compared with blank control group , TNF-αproduced an obviously increased permeability in EA.hy926 cells (2.479 ±0.117 vs.1.769 ±0.554, t =3.543, P =0.008 ) and decreased the expression of VE-cadherin mRNA (1.145 ±0.035 vs.1.593 ±0.161, t=-4.707, P=0.035). CHR (1 nM, 10 nM, 100 nM) increased the expression of VE -cadherin mRNA (1.512 ±0.045, 1.615 ±0.170, 1.918 ±0.355 vs.1.162 ±0.189, P<0.05) , while CHR (1 nM, 10 nM, 100 nM, 1000 nM) alleviated high-permeability (1.954 ±0.379, 1.835 ±0.090, 1.430 ±0.349, 1.559 ± 0.447 vs.2.479 ±0.117, P<0.05) and low-expression of VE -cadherin mRNA (1.541 ±0.149, 1.529 ±0.098, 2.087 ±0.437, 1.640 ±0.160 vs.1.145 ±0.035, P<0.05) that induced by TNF-αin a dose-dependent manner .Furthermore, the low-expression of VE-cadherin proteins and up-regulation of phosphorylated p 38 MAPK proteins expressions in the TNF -αgroup were markedly attenuated in the presence of CHR .Conclusion In a dose-dependent manner , CGA47-66 ( CHR) may inhibit the high permeability of vascular endothelial cells induced by TNF -α.The CHR's effect of inhibition on TNF-αinduced vascular leakage may be related to the p 38 MAPK signal pathways .%目的:观察嗜铬粒蛋白 A ( chromogranin A , CGA )的衍生多肽 CGA47-66(chromogranin, CHR)对TNF-α引起血管内皮细胞(EA.hy926)高通透性的影响和初步机制。方法分别用 CHR、TNF -α作用人血管内皮细胞系 EA.hy926,应用 Transwell 小室法、PCR、Western-blot检测单层内皮细胞通透性的改变,血管内皮钙黏蛋白VE-cadherin mRNA和蛋白的表达,以及磷酸化p38丝裂素活化蛋白激酶( p38 mitogen activated protien kinase , p38 MAPK)和总p38 MAPK等渗透性相关蛋白的表达。结果与空白对照组比较,TNF-α组EA.hy926细胞的通透性显著增高(2.479±0.117比1.769±0.554,t=3.543,P=0.008),VE-cadherin mRNA的表达显著降低(1.145±0.035比1.593±0.161, t=-4.707, P=0.035),而CHR (1 nM、10 nM、100 nM)组中EA.hy926细胞的VE-cadherin mRNA的表达较空白对照组有显著增加(1.512±0.04、1.615±0.170、1.918±0.355比1.162±0.189,P<0.05),同时CHR(1 nM、10 nM、100 nM、1000 nM)能够缓解TNF-α组引起的高渗透性改变(1.954±0.379、1.835±0.090、1.430±0.349、1.559±0.447比2.479±0.117,P<0.05)和 VE -cadherin mRNA 的低表达(1.541±0.149、1.529±0.098、2.087±0.437、1.640±0.160比1.145±0.035,P<0.05),并且在1~100 nM范围内,上述作用呈剂量依赖性;Western-blot检测到TNF-α组EA.hy926细胞的VE-cadherin蛋白表达明显低于空白对照组,磷酸化p38 MAPK蛋白表达明显高于空白对照组;TNF-α组+CHR组与TNF-α组相比,TNF-α组+CHR组中VE -cadherin 蛋白的表达明显增加,磷酸化p38 MAPK蛋白明显降低。结论 CGA衍生多肽CHR能改善TNF-α引起的血管内皮细胞高通透性,这一作用在一定剂量范围内呈剂量依赖性,并且可能与p38 MAPK信号通路相关。

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