胰岛素对牛主动脉内皮细胞一氧化氮合酶(NOS)活性及诱生型NOS mRNA表达的影响

目的　观察胰岛素对牛主动脉内皮细胞一氧化氮合酶 (NOS)活性及诱生型NOS(iNOS)基因表达的影响。方法　原代培养牛降主动脉内皮细胞 ,在不同浓度胰岛素条件下孵育 2 4h ,用比色法检测NOS活性 ,用半定量RT PCR检测内皮细胞iNOSmRNA表达。结果　药理浓度胰岛素 (10 -7mol/L)比生理浓度胰岛素 (10 -10 mol/L)条件下NOS活性及iNOSmRNA表达均显著增高 (均P <0 .0 5 )。结论　高胰岛素浓度状态下大血管病变可能与内皮细胞iNOS过度表达及合成一氧化氮功能异常有关。

Effects of insulin on nitric oxide synthase (NOS) activity and the expression of inducible NOS mRNA in calf aortic endothelial cells

Objective To observe nitric oxide synthase (NOS) activity and the expresssion of inducible NOS (iNOS) mRNA in cultured calf aortic endothelial cells treated with various concentrations of insulin. Methods Cultured calf aortic endothelial cells were incubated with different concentrations of insulin for 24 h. NOS activity was determined by colorimetry and iNOS mRNA was measured by semi-quantitative RT-PCR. Results NOS activity and the expression of mRNA in calf aortic endothelial cells at pharmacological concentration (10 -7 mol/L) of insulin were significantly increased than those at physiological concentration (10 -10 mol/L) of insulin (P<0.05). Conclusion Macrovascular lesion at high level of insulin may be related to excessive expression of iNOS mRNA and abnormality of NOS activity in endothelial cells.