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首页> 外文期刊>Canadian Journal of Physiology and Pharmacology >Vascular responses to alpha-adrenergic stimulation and depolarization are enhanced in insulin-resistant and diabetic Psammomys obesus.
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Vascular responses to alpha-adrenergic stimulation and depolarization are enhanced in insulin-resistant and diabetic Psammomys obesus.

机译:在胰岛素抵抗和糖尿病性Psammomys obesus中,对α-肾上腺素能刺激和去极化的血管反应增强。

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摘要

Since vascular complications often accompany diabetes, we examined the influence of the endothelial lining on vascular reactivity in Psammomys obesus, a desert gerbil that acquires insulin resistance and diabetes when exposed to a laboratory diet. Vasoconstriction to phenylephrine and depolarizing KCl, as well as carbachol endothelium-dependent relaxation, were assessed in rings of thoracic aortae obtained from three groups: (i) group A, normoglycemic-normoinsulinemic; (ii) group B, normoglycemic-hyperinsulinemic, and (iii) group C, hyperglycemic-hyperinsulinemic animals. As expected, marked hypertriglyceridemia and hypercholesterolemia characterized groups B and C, which developed enhanced contractile responsiveness to phenylephrine and KCl compared with controls (group A). Furthermore, both experimental groups displayed a significant decrease in endothelium-dependent relaxation to carbachol. Altered lipid profiles are considered to play some role in the observed modification of aortic reactivity. Overall, our data indicate that vascular contractile responsiveness is enhanced early in the development of insulin resistance and diabetes in the female P. obesus.
机译:由于糖尿病经常伴随血管并发症,因此我们研究了内皮衬对沙门氏菌(Psammomys obesus)中的血管反应性的影响。沙门氏菌是一种沙漠鼠,在实验室饮食中会获得胰岛素抵抗和糖尿病。在三组胸主动脉环中评估了去氧肾上腺素的血管收缩和去极化KCl以及卡巴胆碱依赖性的舒张作用:(i)A组,正常血糖-降血糖药物; (ii)B组为高血糖高胰岛素血症动物,(iii)C组为高血糖高胰岛素血症动物。如预期的那样,显着的高甘油三酯血症和高胆固醇血症是B和C组的特征,与对照组相比,它们对苯肾上腺素和KCl的收缩反应性增强(A组)。此外,两个实验组均显示内皮依赖性的对卡巴胆碱的松弛显着降低。认为脂质分布改变在观察到的主动脉反应性改变中起一定作用。总体而言,我们的数据表明,在雌性P. obesus胰岛素抵抗和糖尿病发展的早期,血管收缩反应性得到了增强。

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