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首页> 外文期刊>Diabetes >Islet Transplantation Restores Normal Levels of Insulin Receptor and Substrate Tyrosine Phosphorylation and Phosphatidylinositol 3-Kinase Activity in Skeletal Muscle and Myocardium of Streptozocin-Induced Diabetic Rats
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Islet Transplantation Restores Normal Levels of Insulin Receptor and Substrate Tyrosine Phosphorylation and Phosphatidylinositol 3-Kinase Activity in Skeletal Muscle and Myocardium of Streptozocin-Induced Diabetic Rats

机译:胰岛移植恢复链脲佐菌素诱发的糖尿病大鼠骨骼肌和心肌中的胰岛素受体和底物酪氨酸磷酸化和磷脂酰肌醇3-激酶活性的正常水平。

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摘要

Insulin-dependent diabetes in rats is characterized by abnormalities of post-binding insulin signaling reactions that are not fully corrected by exogenous insulin therapy. The aim of this study was to investigate the effects of Islet transplantation on insulin signaling in skeletal Muscle and myocardium of streptozocin (STZ)-induced Diabetic rats. Control rats, untreated diabetic rats, and Diabetic rats transplanted with syngeneic islets under the Kidney capsule were studied. Compared with controls Diabetic rats were characterized by multiple insulin sig- Naling abnormalities I skeletal muscle, which included 1) increased insulin-stimulated tyrosine phosphoryla- tion of the insulin receptor β-subunit and insulin recep- tor substrates IRS-1 and IRS-2,2) increased substrate tyrosine phosphorylation in the basal state, 3) a decreased amount of IRS-1 protein, 4) markedly ele- vated basal and insulin-stimulated phosphatidylinositol (PI) 3-kinase activity in anti-IRS-1 immunoprecipitates from total tissue extracts, and 5) increased PI 3-kinase activity in low-density microsomes.
机译:大鼠胰岛素依赖型糖尿病的特征在于结合后胰岛素信号转导反应的异常,该异常不能通过外源性胰岛素疗法完全纠正。这项研究的目的是研究胰岛移植对链脲佐菌素(STZ)诱导的糖尿病大鼠骨骼肌和心肌中胰岛素信号的影响。研究了对照大鼠,未治疗的糖尿病大鼠和在肾囊下移植同基因胰岛的糖尿病大鼠。与对照组相比,糖尿病大鼠的特征在于多发胰岛素信号异常的I型骨骼肌,包括1)胰岛素刺激的β-亚基的胰岛素刺激的酪氨酸磷酸化和胰岛素受体底物IRS-1和IRS-2的增加,2)在基础状态下增加底物酪氨酸的磷酸化,3)在IRS-1蛋白中减少的量,4)在抗IRS-1免疫沉淀中基础和胰岛素刺激的磷脂酰肌醇(PI)3-激酶活性显着升高总的组织提取物,以及5)在低密度微粒体中增加了PI 3-激酶活性。

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