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首页> 外文期刊>The journals of gerontology.Series A. Biological sciences and medical sciences >Fatty acids impair endothelium-dependent vasorelaxation: a link between obesity and arterial stiffness in very old Zucker rats.
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Fatty acids impair endothelium-dependent vasorelaxation: a link between obesity and arterial stiffness in very old Zucker rats.

机译:脂肪酸损害内皮依赖性血管痉挛:肥胖症大鼠肥胖和动脉僵硬之间的联系。

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摘要

To analyze age-related interactions between obesity, its associated metabolic disorders, and macrocirculation, we studied large artery stiffness and fatty acid responsiveness in lean and obese Zucker rats, aged 25 (adult) and 80 weeks (very old). Systolic arterial pressure was higher in old obese than in old lean rats (178 ± 10 vs 134 ± 8 mmHg, respectively). Carotid elastic modulus-wall stress curves showed increased age-dependent arterial stiffening, which was greater in obese animals. Old obese exhibited endothelial dysfunction with increased systemic oxidative stress. Adult obese had elevated plasma free fatty acid levels (1,866 ± 177 vs 310 ± 34 μg/μL in lean animals). In old obese, linoleate and palmitate increased contractility to phenylephrine and reduced relaxation to acetylcholine. Thus, obesity at 25 weeks appears to trigger accelerated arterial aging observed at 80 weeks. The early increase in free fatty acids may be a key effector in the severe arterial stiffness of the aged obese Zucker model.
机译:分析肥胖与肥胖症之间的年龄相关的相互作用,其相关代谢障碍和宏观调度,我们研究了瘦肉和肥胖的Zucker大鼠的大动脉僵硬和脂肪酸反应性,年龄25岁(成人)和80周(非常旧)。旧肥胖的收缩动脉压力比旧瘦鼠(分别为178±10±8 mmHg)较高。颈动脉弹性模量 - 壁应力曲线显示出增加的年龄依赖性动脉加强,肥胖动物更大。旧肥胖表现出内皮功能障碍,具有增加的全身氧化应激。成年人肥胖的血浆游离脂肪酸水平升高(1,866±177 Vs 310±34μg/μl,瘦动物)。在旧的肥胖中,LiNoleate和棕榈酸盐将收缩性增加给苯妥苯胺并减少对乙酰胆碱的弛豫。因此,在25周时肥胖似乎在80周观察到触发加速动脉衰老。自由脂肪酸的早期增加可能是老年肥胖Zucker模型的严重动脉僵硬度的关键效应。

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