罗格列酮对高胰岛素培养的内皮细胞一氧化氮的影响及其机制研究 |
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引用本文: | 昊静,雷闽湘,谢小云,冯湘玲.罗格列酮对高胰岛素培养的内皮细胞一氧化氮的影响及其机制研究[J].中华糖尿病杂志,2009,17(5):384-388. |
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作者姓名: | 昊静 雷闽湘 谢小云 冯湘玲 |
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作者单位: | 吴静,雷闽湘,谢小云(中南大学湘雅医院内分泌科,长沙,410008);冯湘玲(中南大学肿瘤研究所)
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基金项目: | 湖南省科技厅资助项目 |
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摘 要: | 目的观察罗格列酮(RGZ)对高胰岛素培养的人脐静脉内皮细胞(HUVEC)NO浓度和内皮型一氧化氮合酶(eNOS)、磷酯酰肌醇3激酶(P13K)和蛋白激酶B(PKB)表达的影响,探讨RGZ改善高胰岛素状态下内皮功能障碍的信号转导机制。方法高浓度胰岛素培养HUVEC72h,并用不同浓度的RGZ进行干预。检测NO浓度,PI3K mRNA的表达,PKB、eNOS总蛋白和PKB丝氨酸473(PKB-Ser473)、eNOS丝氨酸1177(eNOS-Ser1177)的磷酸化表达。结果高浓度胰岛素培养HUVEC能呈剂帚和时间依赖性地降低N0的浓度,抑制内皮细胞P13KmRNA表达和PKB-Ser473、eNOS-Ser1177的磷酸化。用RGZ干预能硅著升高高胰岛素培养的内皮细胞NO的浓度和PKB、eNOS的磷酸化,增强PI3KmRNA表达;eNOS和P13K阻断剂均能阻断RGZ对高胰岛素培养的内皮细胞中NO浓度的升高,PI3K阻断剂还能阻断RGZ对高胰岛素培养内皮细胞PKB、eNOS的磷酸化。结论高胰岛素能下调P13K/PKB/eNOs信号通路而抑制内皮细胞NO的产生,RGZ能通过上调PI3K/PKB通路而增强高胰岛素培养的内皮细胞eNOS的活性和NO的产生。
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关 键 词: | 罗格列酮 一氧化氮 内皮型一氧化氮合酶 磷酯酰肌醇3激酶 蛋白激酶B |
Effect produced by rosiglitazone on nitric oxide produced by the high insulin- cultured human umbilical vein endothelial cells and its mechanism |
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Affiliation: | WU Jing , LEI Min xiang , XIE Xiao-yun, et al. (Department of Endocrinology, Xiangya Hospital, Central South University, Changsha 410008, China) |
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Abstract: | Objective To investigate the effects of rosiglitazone on endothelium-produced nitric oxide (NO) and on the expressions of phosphatidylinositol 3 kinase (PI3K)/protein kinase B(PKB) /the endothelial nitric oxide synthase (eNOS) in high insulin cultured human umbilical vein endothelial cells (HUVEC). Methods HUVEC cultured with 100nmd/L insulin were treated with various concentrations of rosiglitazone. NO was measured using Griess reaction in cell culture supernatants, expression of PI3K mRNA was measured using RT-PCR, expresstions of PKB, eNOS and phosphorylation of PKB-Ser473, eNOS-Ser1177 were measured using Western blot. Results In HUVEC, High insulin inhibited endothelial NO production and eNOS-Ser1177 phosphorylation without significant effect on eNOS expression. High insulin also inhibited expression of PI3K mRNA and phosphorylation of PKB-Ser473. Rosiglitazone increased NO production and the expressions of PI3K mRNA and phosphorylation of PKB, eNOS in HUVEC cultured with high insulin. L-NAME blocked the rosiglitazone-induced NO formation, and LY294002 prevented the increases of NO concentration and eNOS-Serl177 and PKB-Ser473 phosphorylation induced by rosigtitazone in HUVEC cultured with high insulin. Conclusions High insulin inhihites phosphorylation of eNOS by down-regulating PI3K/PKB signaling pathways. Treatment with rosiglitazone stimulates eNOS phosphorylation through a PI3K/PKB-mediated mechanism in high insulin cultured HUVEC. |
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Keywords: | Rosiglitazone Nitric oxide Endothelial nitric oxide synthase Phosphatidylinositol 3- kinase Protein kinase B |
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