环氧化酶2介导2型糖尿病db/db小鼠胰岛素抵抗内皮功能紊乱的机制

目的探讨胰岛素抵抗对2型糖尿病(T2DM)小鼠内皮功能紊乱的影响机制。方法选取T2DM模型小鼠db/db及其同窝正常对照小鼠(db/+)各10只,体外分离其肠系膜动脉,各组予胰岛素刺激及细胞外信号调节激酶激酶抑制剂(MEK)PD98059和环氧合酶2(COX-2)特异性阻滞剂NS398等抑制剂预处理后,测定离体血管收缩、舒张的活性,并利用定量聚合酶链反应(QPCR)及酶联免疫吸附实验(ELISA)Nt]定离体血管内皮源性血管舒缩因子。培养人脐静脉内皮细胞,检测胰岛素抵抗状态下内皮细胞内胰岛素信号转导及相关蛋白表达。两组间差异比较使用£检验,多组间比较采用单因素方差分析。结果与胰岛素诱导db/+...

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Published in中华糖尿病杂志 Vol. 8; no. 4; pp. 232 - 236
Main Author 王熠 叶红英 张朝云 徐爱民 李益明
Format Journal Article
LanguageChinese
Published 复旦大学附属华山医院内分泌科,上海,200040 2016
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Summary:目的探讨胰岛素抵抗对2型糖尿病(T2DM)小鼠内皮功能紊乱的影响机制。方法选取T2DM模型小鼠db/db及其同窝正常对照小鼠(db/+)各10只,体外分离其肠系膜动脉,各组予胰岛素刺激及细胞外信号调节激酶激酶抑制剂(MEK)PD98059和环氧合酶2(COX-2)特异性阻滞剂NS398等抑制剂预处理后,测定离体血管收缩、舒张的活性,并利用定量聚合酶链反应(QPCR)及酶联免疫吸附实验(ELISA)Nt]定离体血管内皮源性血管舒缩因子。培养人脐静脉内皮细胞,检测胰岛素抵抗状态下内皮细胞内胰岛素信号转导及相关蛋白表达。两组间差异比较使用£检验,多组间比较采用单因素方差分析。结果与胰岛素诱导db/+小鼠离体血管环舒张不同,胰岛素呈剂量依赖性诱导db/db小鼠肠系膜动脉离体血管环收缩,最大收缩度为28.2%±8.2%。加入PD98059及NS398预处理后,血管转为舒张,最大舒张度分别为41.2%±2.2%和26.3%±3.2%(t=47.3、33.2,均P〈0.05)。db/db小鼠血管内皮COX-2表达较对照组增加4倍,COX.2介导的前列腺素F2a(PGF2a)产生增多,经COX.2特异性抑制剂NS-398处理后,PGF2a产量由(1614_+8)下降至(536+4)ng/g蛋白(t=381.9,P〈0.05),而PGFla水平无下降。结论胰岛素诱导db/db小鼠内皮依耐性的血管收缩,
Bibliography:Diabetes mellitus, type 2; Endothelium; Cyclooxygenase 2; Insulin resistance
Objective To explore the mechanism of insulin resistance on endothelial dysfunction in type 2 diabetic mellitus(T2DM) mice. Methods Mesenteric arteries isolated from T2DM mice (db/db) and normal control group (db/+)(n=10 for each group) were subjected to wire-myograph for measurement of vasoreactivity response to insulin treatment. The expression levels of cyclooxygenase and putative constrictor prostanoids in the arteries were determined using quantitative polymerase chain reaction(QT-PCR) analysis and enzyme linked immunosorbent assay(ELISA), respectively. The t-test and one way analysis of variance were used for statistical analysis. Results Insulin evoked endothelium-dependent vasoconstriction in mesenteric arteries from db/db mice in a dose dependent manner, max vasoconstriction was 28.2%±4.1% to precontraction. Both MEK inhibitor and cyclooxygenase-2 (COX-2) specific inhibitor could reverse the insulin-stimulated vasoconstrictio
ISSN:1674-5809
DOI:10.3760/cma.j.issn.1674-5809.2016.04.010