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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Progressive diastolic dysfunction in the female mRen(2).Lewis rat: influence of salt and ovarian hormones.
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Progressive diastolic dysfunction in the female mRen(2).Lewis rat: influence of salt and ovarian hormones.

机译:雌性mRen(2)中的进行性舒张功能障碍。刘易斯大鼠:盐和卵巢激素的影响。

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This study determined the contribution of chronic salt loading and early loss of ovarian hormones on diastolic function in the hypertensive female mRen(2).Lewis rat, a monogenetic strain that expresses the mouse renin-2 gene in various tissues. Estrogen-intact mRen2 rats fed a high salt (HS) (8% sodium chloride) diet exhibited early diastolic dysfunction when compared to normal salt-fed (NS) (1% sodium chloride) rats. In contrast, ovariectomized (OVX) rats on either NS or HS diets showed impaired relaxation with evidence of elevated left ventricular filling pressures (E/e') or pseudonormalization. This more advanced stage of diastolic dysfunction was associated with increases in interstitial cardiac fibrosis and high circulating levels of aldosterone, two factors leading to reduced ventricular compliance. These findings may explain the preponderance of diastolic dysfunction and diastolic heart failure in postmenopausal women and provide a potential animal model for evaluating prevention and treatment interventions for this disorder.
机译:这项研究确定了慢性盐负荷和卵巢激素的早期丢失对高血压女性mRen(2)的舒张功能的影响。刘易斯大鼠是在各种组织中表达小鼠renin-2基因的单基因株。与正常食盐喂养(NS)(1%氯化钠)大鼠相比,高盐(HS)(8%氯化钠)饮食的雌激素完整mRen2大鼠表现出早期舒张功能障碍。相比之下,接受NS或HS饮食的去卵巢(OVX)大鼠表现出松弛度受损,并伴有左心室充盈压(E / e')升高或假正常化的迹象。舒张功能障碍的这一晚期阶段与间质性心脏纤维化的增加和醛固酮的高循环水平有关,这是导致心室顺应性降低的两个因素。这些发现可能解释了绝经后妇女的舒张功能障碍和舒张性心力衰竭的优势,并为评估该疾病的预防和治疗干预措施提供了潜在的动物模型。

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