摘要
目的 通过建立大鼠小肠缺血再灌注损伤(IIRI)模型,探讨肠组织需肌醇酶1仪(IREIot)与肿瘤坏死因子受体相关因子2(TRAF2)的表达及意义。方法雄性SD大鼠50只,按随机数字表法分为假手术组(sham组,例数=10)和肠缺血再灌注组(I/R组,例数=40)。sham组仅开腹、关腹;I/R组给予阻断肠系膜上动脉血流30min,恢复再灌注2h、6h、12h、24h分为4个亚组,依据每个亚组存活数量取8只统计。光镜下观察HE染色小肠组织病理学改变,细胞凋亡原位检测法(TUNEL法)检测小肠黏膜上皮细胞凋亡指数(AI),酶联免疫吸附法(ELISA法)检测小肠组织TNF-a及血浆小肠脂肪酸结合蛋白(I-FABP)的水平,Westernblot法检测小肠组织内质网应激(ERS)蛋白IREld、磷酸化IREloc(P—IREld)、TRAF2的表达。结果1.光镜示MR组各亚组较sham组小肠损伤明显,6h组损伤最重。2.MR组肠组织TNF-a[sham组:(16.41±4.44)ng/L,2h组:(79.71±8.20)ng/L,6h组:(131.70±11.59)ng/L,12h组:(94.23±7.66)ng/L,24h组:(69.78±9.58)ng/L]、小肠黏膜上皮细胞AI[sham组:(3.93±0.77)%,2h组:(16.24±1.97)%,6h组:(42.19±2.40)%,12h组:(37.79±2.34)%,24h组:(10.38±1.46)%]及I-FABP水平[sham组:(0.65±0.10)×10^3ng/L,2h组:(1.47±0.10)×10^3ng/L,6h组:(2.36±0.17)×10^3ng/L,12h组:(37.79±2.34)×10^3ng/L,24h组:(1.41±0.09)×10^3g/L]较sham组显著升高(F=231.462、149.032、162.491,P均〈0.01)。3.L/R组各亚组中p-IRE1a/IRE1d、TRAF2的表达较sham组均明显升高(F=40.473、59.59,P均〈0.01),再灌注2h表达升高,6~12h维持较高表达,24h表达明显下调,且p-IRE1a/IRE1a值的改变与TRAF2在各组中的表达变化趋势一致。结论IIRI诱发ERS,激活IRE1a,上调TRAF
Objective To investigate the expression of inositol requiting enzyme 1a (IRE1 or) and tumor necrosis factor receptor - associated factor 2 (TRAF2) and its significance through establishing models of intestinal ischemia reperfusion injury (IIRI) in rats. Methods According to the random number table ,50 male SD rats were randomly divided into 2 groups : sham operation group ( n = 10 ) and ischemia reperfusion (I/R) group ( n = 40). Sham group animals underwent laparotomy. I/R group rats were subjected to occlusion of the superior mesenteric artery for 30 min ; then the blood flow was restored. I/R group animals were divided into 4 subgroups :2 h ,6 h, 12 h,24 h according to the time of reperfusion. Eight rats were examined based on the number of live rats in each subgroup. The HE staining pathological changes in intestinal samples were observed by the light microscope. The small intestinal epithelial cell apoptosis index (AI) was detected by terminal deoxynucieotidyl transferase dUTP nick end labeling (TUNEL). The expression levels of intestinal tissues tumor necrosis factor ot ( TNF - ct) and plasma intestinal fatty acid - binding protein ( I - FABP) were detected by ELISA tests. Situ end labeling method was used to detect intestinal cell AI. Western blot was applied to investigate the expression of endoplasmic reticulum stress (ERS) proteins IRElot, phosphorylation IRE1a (p -IRE1 or) and TRAF2 in all group rats intestinal tissues. Results (1)The pathological changes showed that the intestinal injury of I/R groups was more severe than that of sham group, especially at 6 h. (2) Compared with sham group, the expression levels of TNF - a[ sham group ( 16.41 ±4.44) ng/L,2 h group: (79.71± 8.20) ng/L, 6 h group : (131.70 ±11.59) ng/L,12 h group: (94.23±7.66) ng/L,24 h group: (69.78 ±9.58) ng/L] ,AI[ sham group: (3.93 ±0.77)% ,2 h group: (16.24 ± 1.97) % ,6 h group: (42.19 ±2.40)% ,12 h group: (37.79 ±2
出处
《中华实用儿科临床杂志》
CSCD
北大核心
2016年第7期511-514,共4页
Chinese Journal of Applied Clinical Pediatrics
基金
滨州医学院科技重点计划基金(BY2012KJZD02)
关键词
肠缺血再灌注损伤
需肌醇酶1a
炎症
凋亡
Intestinal ischemia reperfusion injury
Inositol requiting enzyme 1a
Inflammatory
Apoptosis