JACC:阻断脂质诱导的综合应激反应可减少动脉粥样硬化

2019-03-25 不详 MedSci原创

真核细胞可以通过在真核起始因子2α(eIf2α)上丝氨酸-51磷酸化处聚集来对多种刺激作出反应,并激活整合应激反应(ISR),然而,在人和小鼠的动脉硬化过程中,eIf2α的磷酸化一直存在。本研究的目的旨在评估在慢性代谢和炎症性疾病动脉粥样硬化中截获ISR的潜在益处。 本研究利用3种不同的小分子和ATP模拟敏感激酶等位基因技术,在多个分子节点上阻断ISR,研究了ISR在脂质诱导炎症激活和动

真核细胞可以通过在真核起始因子2α(eIf2α)上丝氨酸-51磷酸化处聚集来对多种刺激作出反应,并激活整合应激反应(ISR),然而,在人和小鼠的动脉硬化过程中,eIf2α的磷酸化一直存在。本研究的目的旨在评估在慢性代谢和炎症性疾病动脉粥样硬化中截获ISR的潜在益处。

 

本研究利用3种不同的小分子和ATP模拟敏感激酶等位基因技术,在多个分子节点上阻断ISR,研究了ISR在脂质诱导炎症激活和动脉粥样硬化中的作用。结果显示,巨噬细胞中,脂质激活的eIf2α信号诱导线粒体蛋白酶lon蛋白酶1lonp1),它降解磷酸酶和紧张素诱导的假定激酶1,阻断帕金介导的有丝分裂,导致更大的线粒体氧化应激、炎症激活和巨噬细胞中的白细胞介素-1β分泌。另外,ISR抑制剂可以抑制高脂血症引起的炎症激活和炎症,减少动脉粥样硬化。

 

研究结果显示,内质网通过激活eIf2α-lonp1信号来控制线粒体清除率,有助于氧化应激反应的增强,通过饮食中的脂肪触发强大的炎症激活和白细胞介素-1β分泌。


原始出处:

Umut I et al.Intercepting the Lipid-Induced Integrated Stress Response Reduces Atherosclerosis.JACC.2019 Mar.


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    2019-06-21 hbwxf
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