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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Effect of type-1 diabetes mellitus on the regulation of insulin and endothelin-1 receptors in rat hearts.
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Effect of type-1 diabetes mellitus on the regulation of insulin and endothelin-1 receptors in rat hearts.

机译:1型糖尿病对大鼠心脏中胰岛素和内皮素1受体的调节作用。

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This project assesses the treatment role with insulin and (or) angiotensin II receptor subtype-1 (AT1-R) blocker (ARB) on insulin receptor and endothelin-1 receptor subtype (ETA-R and ETB-R) regulation in rat hearts suffering from insulin-dependent diabetes mellitus (IDDM). Animals were divided into 6 groups: groups 1, 3, and 5 were controls consisting of normal, diabetic (streptozotocin-treated, once at 0 time), and diabetic supplemented daily with insulin, respectively, whereas groups 2, 4, and 6 were the controls treated daily with losartan. One month after enrollment, rats were sacrificed and samples of cardiac tissue were snapped frozen for immunostaining and Western blotting. Insulin receptor density was observed to be upregulated in the cardiomyocytes of diabetic animals, but downregulated with insulin supplementation alone. Cotreatment with insulin and an ARB resulted in drastic increase in insulin-receptor density in the diabetic rats. In addition, expression of ETA-R in cardiomyocytes was upregulated and was consistently maintained within the various treatment modalities. However, ETB-R expression was significantly reduced in the diabetic group treated with both insulin and an ARB. The changes in the expression of the insulin, the ETA-Rs, and the ETB-Rs at the various sites of the myocardium and the effect of both insulin treatment and blockade of the AT1-R explain the new benefits related to the halting of myocardial remodeling in IDDM rats.
机译:该项目评估了胰岛素和(或)血管紧张素II受体亚型1(AT1-R)阻断剂(ARB)对大鼠心脏疾病中胰岛素受体和内皮素1受体亚型(ETA-R和ETB-R)调节的治疗作用来自胰岛素依赖型糖尿病(IDDM)。将动物分为6组:第1、3和5组为对照组,分别由正常,糖尿病(经链脲佐菌素治疗,于0次一次)和每天补充胰岛素的糖尿病组成,而第2、4、6组为对照组。对照每天用氯沙坦治疗。入选后一个月,处死大鼠,将心脏组织样本速冻以进行免疫染色和蛋白质印迹。在糖尿病动物的心肌细胞中,胰岛素受体的密度被上调,但单独补充胰岛素则被下调。胰岛素和ARB的共同治疗导致糖尿病大鼠胰岛素受体密度急剧增加。另外,ETA-R在心肌细胞中的表达被上调,并且在各种治疗方式中始终保持不变。但是,在胰岛素和ARB联合治疗的糖尿病组中,ETB-R表达显着降低。胰岛素在心肌各个部位的表达,ETA-Rs和ETB-Rs的变化以及胰岛素治疗和AT1-R阻滞的作用解释了与停止心肌有关的新益处在IDDM大鼠中重塑。

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