Reversal of diabetic vasculopathy in a rat model of type 1 diabetes by opiorphin-related peptides.

Reversal of diabetic vasculopathy in a rat model of type 1 diabetes by opiorphin-related peptides.
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Opiorphin 相关肽可逆转 1 型糖尿病大鼠模型中的糖尿病血管病变。

DOI:
10.1152/ajpheart.00383.2011
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发表时间:
2011
期刊:
American journal of physiology. Heart and circulatory physiology
影响因子:
--
通讯作者:
Davies,KelvinP
Davies,KelvinP
中科院分区:
--
文献类型:
--
作者:
Calenda,Giulia;Tong,Yuehong;Kanika,NirmalaD;Tar,MosesT;Suadicani,SylviaO;Zhang,Xinhua;Melman,Arnold;Rougeot,Catherine;Davies,KelvinP

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糖尿病会导致多种血管并发症,通常称为糖尿病血管病变,包括微血管[勃起功能障碍(ED)、视网膜病变、神经病变和肾病]和大血管并发症(高血压、冠心病和心肌梗死)。在糖尿病动物和患有 ED 的患者中,体组织中阿片啡肽或阿片啡肽相关基因的表达降低。发现阿片啡肽和大鼠同源肽唾液酸都在血浆中循环。在本研究中,我们研究了糖尿病是否会引起血浆唾液酸啡肽水平的变化,以及这些水平的变化是否可以调节血管平滑肌的生物化学和生理学。我们发现,在 I 型糖尿病大鼠模型中,循环唾液酸水平降低。将表达唾液酸啡肽的质粒体内注射到糖尿病大鼠体内,可将唾液酸啡肽水平恢复至非糖尿病动物血液中的水平,从而改善勃起功能和血压。唾液酸调节C型利钠肽松弛下体和主动脉平滑肌条的能力,以及调节缓激肽调节下体和主动脉平滑肌细胞内钙水平的能力。我们之前已经证明,当勃起功能得到改善时,编码opiorphins的基因的表达会增加。因此,我们的研究结果表明,通过影响阿片啡相关肽的循环水平,适当的勃起功能不仅是男性整体血管健康的指标,而且是调节剂。
Diabetes results in a myriad of vascular complications, often referred to as diabetic vasculopathy, which encompasses both microvascular [erectile dysfunction (ED), retinopathy, neuropathy, and nephropathy] and macrovascular complications (hypertension, coronary heart disease, and myocardial infarction). In diabetic animals and patients with ED, there is decreased opiorphin or opiorphin-related gene expression in corporal tissue. Both opiorphin and the rat homologous peptide sialorphin are found circulating in the plasma. In the present study, we investigated if diabetes induced changes in plasma sialorphin levels and if changes in these levels could modulate the biochemistry and physiology of vascular smooth muscle. We show that circulating sialorphin levels are reduced in a rat model of type I diabetes. Intracorporal injection of plasmids expressing sialorphin into diabetic rats restores sialorphin levels to those seen in the blood of nondiabetic animals and results in both improved erectile function and blood pressure. Sialorphin modulated the ability of C-type natriuretic peptide to relax both corporal and aortic smooth muscle strips and of bradykinin to regulate intracellular calcium levels in both corporal and aortic smooth muscle cells. We have previously shown that expression of genes encoding opiorphins is increased when erectile function is improved. Our findings thus suggest that by affecting circulating levels of opiorphin-related peptides, proper erectile function is not only an indicator but also a modulator of overall vascular health of a man.
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