葡萄糖和胰岛素对大鼠血管平滑肌细胞磷脂酶A2活性的影响
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Effect of Glucose and Insulin on Phospholipase A2 Activities of Vascular Smooth Muscle Cells in Rats
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    为观察葡萄糖和胰岛素对血管平滑肌细胞磷脂酶活性的影响,在培养基中分别加入一定浓度的葡萄糖或(和)胰岛素与大鼠血管平滑肌细胞共同孵育72h后,分别测定培养上清液中磷脂酶A2 活性和Na+-K+依赖式ATP酶活性,磷脂酶A2 活性检测采用[3 H]—油酸标记法,Na+-K+依赖式ATP酶活性检测采用以ATP·2Na为底物的比色法。结果发现大鼠血管平滑肌细胞暴露于高糖或(和)高胰岛素环境中,上清液中磷脂酶A2 活性增加,而Na+-K+依赖式ATP酶活性下降,并在一定浓度范围内呈剂量依赖性。葡萄糖浓度由5 .6mmol L增加到33.0mmol L ,上清液中磷脂酶A2 活性由( 4.2±0 .2 )×10 1 2 (min·L)增加到( 9.2±0 .2 )×10 1 2 (min·L) ;而Na+-K+依赖式ATP酶活性由4.8±1.0 2 μmol (g·min)下降到2 .0 6±0 .99μmol (g·min)。胰岛素浓度由5 .0Mu L增加到10 0 0Mu L ,上清液中磷脂酶A2 活性由( 3 .8±0 .4)×10 1 2 (min·L)增加到( 11.8±0 .6 )×10 1 2 (min·L) ;而Na+-K+依赖式ATP酶活性由4.0±1.6 8μmol (g·min)下降到2 .19±1.0 2 μmol (g·min) ,且进一步发现这一效应在作用2 4h后才显著,高糖和高胰岛素有协同作用。结果提示磷脂酶A2 活性增高与糖尿病时动脉粥样硬化形成有关,合理应用磷脂酶A2 抑制剂有助于防止或延缓糖尿病并发动脉粥样硬化的发展

    Abstract:

    Aim To investigate the effect and significance of glucose and insulin on phospholipase A 2 (PLA 2) activities of vascular smooth muscle cells(VSMC). Methods VSMCs in rats were incubated with the DEME which had different concentration glucose or/and insulin for 72 h PLA 2 activities were detected with [ 3 H]-Oleate radioactivity(cpm). Results PLA 2 activities increased with high concentration of glucose or/and insulin and there were dose-dependent relationship. Conclusion The increased PLA 2 activities were associated with atherosclerosis in diabetes, so treatment with PLA 2 inhibitor could prevent the pathological progress of athcrosclerosis in diabetes.

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廖璞,廖雪松,唐维,康格非.葡萄糖和胰岛素对大鼠血管平滑肌细胞磷脂酶A2活性的影响[J].中国动脉硬化杂志,2000,8(2):143~146.

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  • 收稿日期:1999-11-22
  • 最后修改日期:2000-04-28
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