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Influence of hydrogen peroxide on expression of calcium-independent phospholipase A2 in islet microvascular endothelial cells
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- Author:
- No author available
- Journal Title:
- JOURNAL OF THE FOURTH MILITARY MEDICAL UNIVERSITY
- Issue:
- 4
- DOI:
- 10.3321/j.issn:1000-2790.2009.04.004
- Key Word:
- 过氧化氢;磷脂酶A2;胰岛;微血管内皮细胞
Abstract： 目的:研究过氧化氢(H2O2)对胰岛内皮细胞钙非依赖型磷脂酶A2(iPLA2)mRNA表达的影响.方法:用0,30,100和300 μmol/L H2O2诱导IMECs 8 h后进行RT-PCR检测;用300 μmol/L H2O2分别诱导0,4,8和12 h后应用RT-PCR技术进行iPLA2基因表达的检测.采用Annexin V-FTTC/PI双染色检测细胞的凋亡率;采用DIOC6(3)染色检测细胞线粒体膜电位.结果:①300 μmol/L H2O2作用12 h的电泳条带亮度与其他组(0,30,100μmol/L)相比明显减弱,300μmol/L H2O2作用8 h及12 h的电泳条带亮度与0,4 h相比明显减弱.②各浓度H2O2处理组(0,30,100和300 μmol/L)IMECs凋亡率差异具有统计学意义[分别为(2.0±0.5)%,(19.1±5.8)%,(28.4±4.9)%,(40.1±5.1)%,P<0.01];300 μmol/L H2O2处理0,4,8,12 h后,各时间点IMECs凋亡率差异具有统计学意义(P<0.01);③各浓度及各时间点H2O2处理组IMECs细胞内DIOC6(3)的荧光强度差异具有统计学意义(P<0.01).结论:H2O2对IMECs iPLA2的表达具有抑制作用,其抑制作用呈量效及时效关系.
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