氯沙坦改善3T3-L1脂肪细胞胰岛素抵抗的机制研究
目的探讨氯沙坦改善3T3-L1脂肪细胞胰岛素抵抗的主要作用机制。方法以地塞米松诱导3T3-L1脂肪细胞,建立胰岛素抵抗细胞模型,根据细胞模型添加干预药物的不同分为模型对照组(不添加任何药物)、氯沙坦组(分别给予1、10、100μmol/L氯沙坦干预48 h)和wortmannin+氯沙坦组,wortmannin+氯沙坦组以100 nmol/L的磷脂酰肌醇3激酶(PI3K)特异性抑制剂wortmannin预处理20 min后再加入100μmol/L氯沙坦干预48 h。观察脂肪细胞体积的变化,采用葡萄糖氧化酶法检测细胞培养上清液中葡萄糖的浓度,采用Western blotting分析脂肪细胞中PI...
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Published in | 上海交通大学学报(医学版) Vol. 31; no. 12; pp. 1702 - 1706 |
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Main Author | |
Format | Journal Article |
Language | Chinese |
Published |
上海交通大学医学院附属第三人民医院肾内科,上海,201900%上海交通大学医学院附属第三人民医院中心实验室,上海,201900
2011
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Subjects | |
Online Access | Get full text |
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Summary: | 目的探讨氯沙坦改善3T3-L1脂肪细胞胰岛素抵抗的主要作用机制。方法以地塞米松诱导3T3-L1脂肪细胞,建立胰岛素抵抗细胞模型,根据细胞模型添加干预药物的不同分为模型对照组(不添加任何药物)、氯沙坦组(分别给予1、10、100μmol/L氯沙坦干预48 h)和wortmannin+氯沙坦组,wortmannin+氯沙坦组以100 nmol/L的磷脂酰肌醇3激酶(PI3K)特异性抑制剂wortmannin预处理20 min后再加入100μmol/L氯沙坦干预48 h。观察脂肪细胞体积的变化,采用葡萄糖氧化酶法检测细胞培养上清液中葡萄糖的浓度,采用Western blotting分析脂肪细胞中PI3K和胰岛素受体底物1(IRS-1)的表达以及IRS-1丝氨酸磷酸化水平。结果与模型对照组比较,氯沙坦组脂肪细胞体积明显缩小(P〈0.01),细胞培养上清液中葡萄糖的浓度显著降低(P〈0.01),PI3K和IRS-1表达明显上升(P〈0.01),IRS-1丝氨酸磷酸化水平显著下降(P〈0.01)但可被wortmannin阻断。结论氯沙坦可使3T3-L1脂肪细胞胰岛素抵抗模型的细胞体积缩小,并增加细胞对葡萄糖的利用,其机制可能与PI3K信号通路有关。 |
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Bibliography: | 31-1259/R LIU Xiao-li,PAN Yu,SHU Jin-lian,GAO Feng-hou,JIN Hui-min(1.Department of Nephrology,2.Experimental Center,the Third People's Hospital,Shanghai Jiaotong University School of Medicine,Shanghai201900,China) losartan; adipocyte; insulin resistance Objective To investigate the main mechanism of losartan in treatment of insulin resistance in 3T3-L1 adipocytes. MethodsThe model of insulin resistance in 3T3-L1 adipocytes was induced by dexamethasone.Model control group(without treatment with any drug),losartan group(treatment with 1 μmol/L,10 μmol/L and 100 μmol/L losartan for 48 h respectively) and wortmannin+losartan group were divided.Adipocytes in wortmannin+losartan group were pretreated with 100 nmol/L wortmannin,phosphatidylinositol 3-kinase(PI3K) inhibitor for 20 min,and were treated with 100 μmol/L losartan for 48 h.The size of adipocytes was observed,glucose oxidase method was employed to measure the glucose concentration in supernatant of culture fluid,and Western blotting was adopted to detect the |
ISSN: | 1674-8115 |
DOI: | 10.3969/j.issn.1674-8115.2011.12.009 |