Heterozygous eNOS Deficient Mice as a Model to Examine the Effects of eNOS Haploinsufficiency on the Cerebral Circulation

Heterozygous eNOS Deficient Mice as a Model to Examine the Effects of eNOS Haploinsufficiency on the Cerebral Circulation
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杂合 eNOS 缺陷小鼠作为模型检查 eNOS 单倍体不足对脑循环的影响

DOI:
10.29245/2572.942x/2017/2.1111
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发表时间:
2017
期刊:
Journal of neurology & neuromedicine
影响因子:
--
通讯作者:
S. Didion
S. Didion
中科院分区:
--
文献类型:
--
作者:
S. Didion

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源自内皮一氧化氮合酶 (eNOS) 的一氧化氮已被证明是脑血管中内皮依赖性反应的主要介质。单个 eNOS 基因的丢失与大多数血管内皮功能的任何明显负面影响无关。相比之下,我们最近证明杂合性 eNOS 基因缺陷与高脂肪饮食相结合与内皮功能的显着损害相关。这些发现提供了 eNOS 单倍体不足的重要例子,并且直接影响脑血管系统。与 eNOS 缺乏和高脂肪饮食引起的内皮功能损伤相关的一个主要机制似乎与血浆 IL-6 的增加有关,IL-6 通过减少 eNOS 表达或活性以及通过增加血管超氧化物,直接或间接地进一步降低 NO 的生物利用度。总而言之,这些发现为脑血管中高脂肪饮食促进内皮功能障碍的遗传和分子机制提供了重要的见解,并导致 eNOS 基因表达的固有减少,例如由于 eNOS 基因多态性所致的减少。这些发现还强调了 eNOS+/- 小鼠研究 eNOS 单倍体不足对脑血管影响的重要性。
Nitric oxide derived from endothelial nitric oxide synthase (eNOS) has been shown to be a major mediator of endothelium-dependent responses in cerebral blood vessels. Loss of a single eNOS gene is not associated with any apparent negative consequences on endothelial function in most blood vessels. In contrast, we have recently demonstrated that heterozygous eNOS gene deficiency in combination with a high fat diet is associated with marked impairment of endothelial function. These findings provide an important example of eNOS haploinsufficiency and one that directly impacts the cerebral vasculature. A major mechanism associated with the impairment of endothelial function with eNOS deficiency and a high fat diet appears to be related to increases in plasma IL-6 that serves to further reduce the bioavailability of NO either directly or indirectly via reductions in eNOS expression or activity and via increases in vascular superoxide. Taken together, these findings provide important insights into genetic and molecular mechanisms that promote endothelial dysfunction in response to a high fat diet in cerebral blood vessels with inherent reductions in eNOS gene expression, such as those due to eNOS gene polymorphisms. These findings also highlight the importance of eNOS+/− mice to study the effects of eNOS haploinsufficiency on cerebral blood vessels.
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