Liver X Receptor exerts a protective effect against the oxidative stress in the peripheral nerve.

Liver X Receptor exerts a protective effect against the oxidative stress in the peripheral nerve.
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DOI:
10.1038/s41598-018-20980-3
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发表时间:
2018-02-06
期刊:
影响因子:
4.6
通讯作者:
Massaad C
Massaad C
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Hichor M;Sundaram VK;Eid SA;Abdel-Rassoul R;Petit PX;Borderie D;Bastin J;Eid AA;Manuel M;Grenier J;Massaad C

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活性氧簇(ROS)修饰蛋白质和脂类,导致有害后果。因此,维持它们的动态平衡水平至关重要。这项研究强调了LXRs(LXR、α和β)在调节周围神经氧化应激中的内源性作用。我们报道,小鼠两种LXR亚型(LXRdKO)的遗传消融引起显著的运动缺陷,与坐骨神经中阴离子超氧化物的产生增加、脂质氧化和蛋白质羰化有关,尽管激活了Nrf2依赖的抗氧化反应。有趣的是,活性氧清除剂N-乙酰半胱氨酸可以对抗LXRdKO小鼠的行为、电物理、超微结构和生化变化。此外,经LXR激动剂TO901317处理的雪旺细胞对叔丁基氢过氧化氢产生的氧化应激具有更好的防御能力,这意味着LXR在维持周围神经系统的氧化还原动态平衡方面发挥着重要作用。因此,LXR的激活可能是一种很有前途的策略,可以防止由于雪旺细胞氧化还原稳态紊乱而导致的外周髓鞘改变。
Reactive oxygen species (ROS) modify proteins and lipids leading to deleterious outcomes. Thus, maintaining their homeostatic levels is vital. This study highlights the endogenous role of LXRs (LXRα and β) in the regulation of oxidative stress in peripheral nerves. We report that the genetic ablation of both LXR isoforms in mice (LXRdKO) provokes significant locomotor defects correlated with enhanced anion superoxide production, lipid oxidization and protein carbonylation in the sciatic nerves despite the activation of Nrf2-dependant antioxidant response. Interestingly, the reactive oxygen species scavenger N-acetylcysteine counteracts behavioral, electrophysical, ultrastructural and biochemical alterations in LXRdKO mice. Furthermore, Schwann cells in culture pretreated with LXR agonist, TO901317, exhibit improved defenses against oxidative stress generated by tert-butyl hydroperoxide, implying that LXRs play an important role in maintaining the redox homeostasis in the peripheral nervous system. Thus, LXR activation could be a promising strategy to protect from alteration of peripheral myelin resulting from a disturbance of redox homeostasis in Schwann cell.
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