摘要
目的观察肿瘤坏死因子-a(TNF-a)对大鼠肺微血管内皮细胞(PMVEC)表达埃兹蛋白-根蛋白-膜突蛋白(ezrin-radixin-moesin,ERM)及磷酸化ERM蛋白(p-ERM)的影响,并初步探讨Rho激酶(ROCK)与ERM蛋白磷酸化的关系。方法体外培养大鼠PMVEC,随机(随机数字法)分为TNF-a量效组(0、0.1、1、10μg/L TNF—a与PMVEC孵育60min)、TNF-a时效组(10μg/LTNF-a分别与PMVEC孵育0、15、30、60、90、120、180min)和ROCK抑制剂(Y-27632)干预组:分别以10μg/L的TNF-a,和30μmol/L Y-27632+10μg/LTNF-a与PMVEC孵育60min。Western印迹检测ERM蛋白及p-ERM相对表达量。采用SPSS 16.0软件进行分析,多组变量间比较采用单因素方差分析,以P〈0.05为差异具有统计学意义。结果Western印迹检测到大鼠PMVEC均表达ERM蛋白和p-ERM,量效组p-ERM表达量随TNF-a浓度(0、0.1、1、10μg/L)增加逐渐升高,分别为0.648±0.102、0.728±0.082、0.926±0.121、1.245±0.134(均P=0.000)。时效组p-ERM相对表达量于15min开始上升(0.777±0.151),90min达高峰(1.295±0.176),之后渐下降,120min(0.802±0.139),180min仍维持较高水平(0.769±0.128),分别与未刺激0 min组(0.631±0.123)比较,P=0.004,0.000,0.001,0.016。ROCK抑制剂预处理PMVEC后再给予TNF-a.刺激,p-ERM相对表达量(0.634±0.112)较单独TNF-a刺激组(0.875±0.164)显著减少(P=0.002),而较单独ROCK抑制剂组(0.661±0.108)和未处理组(0.654±0.125)差异无统计学意义(分别为P=0.973,P=0.900)。结论TNF-a诱导大鼠PMVEC中的ERM蛋白磷酸化表达增加,ROCK参与其磷酸化调控。
Objective To investigate the effect of tumor necrosis factor - α (TNF - eL) on the levels of ezrin - radixin - moesin (ERM) proteins and the phosphorylated ERM proteins ( p - ERM) in rat pulmonary microvascular endothelial cells (PMVEC) , and to explore Rho kinase (ROCK) influencing on modulation of the ERM proteins phosphorylation. Methods Cultured rat pulmonary mierovascular endothelial cells were randomly divided into dose - dependent and time - dependent groups. In dose - dependent group, cells were cultured with different doses of TNF -α (0, 0. 1, 1, 10 μg/LTNF -a) for 60 min. In time -dependent group, cells were cultured with TNF -α (10 μg/L) for 0, 15, 30, 60, 90, 120, 180 min. In ROCK inhibitor (Y27632) intervention group, cells were cultured with TNF -α ( 10 μg/L) or Y27632 (30 μmol/L) + TNF - α ( 10 μg,/L) for 60 rain respectively. The levels of ERM proteins and p - ERM were determined by western blot. One way analysis of variance (ANOVA) was employed for statistical analysis by using SPSS version 16. 0 software to compare values among all groups. A significant difference was presumed as a P value 〈0. 05. Results Western blot revealed that ERM and p - ERM proteins were present in rat PMVEC. Stimulation withTNF-a gradually up - regulated the level of p- ERM proteins in a dose -dependent manner [0 μg/LTNF-a group: (0. 648±0. 102), 0. 1 μg/LTNF-a group: (0.728±0.082) , 1 μg/LTNF-a group: (0.926 ±0. 121) , 10 μg/LTNF-a group: (1.245 ± 0. 134), all P =0.000]. In time- dependent group, the level of p- ERM proteins rose at 15 min (0. 777±0. 151), peaked at 90 min ( 1. 295 ±0. 176), then decreased gradually at 120 min (0. 802 ± 0. 139), but stayed higher level at 180 min (0. 669 ± 0. 128 ) than that in un - stimulated 0 min group (0. 631 ±0. 123, P =0. 004, 0. 000, 0. 001, 0. 016, respectively). When PMVEC pre - incubated with ROCK inhibitor and TNF - a, the level of p - ERM proteins caused a
出处
《中华急诊医学杂志》
CAS
CSCD
北大核心
2015年第6期612-616,共5页
Chinese Journal of Emergency Medicine
基金
国家自然科学基金(81370170,1100053)