PLOS ONE:长寿蛋白SIRT1通过非催化活性保护神经

2019-04-13 海北 MedSci原创

已有的研究显示,SIRT1,一种NAD+依赖性脱乙酰基酶,在各种体外和体内的神经退行性疾病模型中保护神经元。

已有的研究显示,SIRT1,一种NAD+依赖性脱乙酰基酶,在各种体外和体内的神经退行性疾病模型中保护神经元。

研究人员之前已经描述了SIRT1的神经保护作用,与其催化活性无关。为了证实这一结论,研究人员在小脑颗粒神经元中测试了一组SIRT1缺失突变体构建体,命名为Δ1-Δ10,通过低钾处理诱导细胞凋亡。

研究人员发现,其N-末端的缺失,缺乏催化结构域部分的缺失,以及缺乏ESA(对SIRT1活性必需)的缺失,与野生型SIRT1一样具有神经保护作用。

相反,跨越残基542-609,构建体Δ8的区域的缺失显着降低了SIRT1的神经保护活性。如用LK诱导的细胞凋亡所观察到的,除Δ8外的所有SIRT1构建体均保护神经元免受突变亨廷顿毒素的毒性。

尽管不需要其自身的催化活性,但是SIRT1的神经保护作用被IHDAC的抑制剂以及内源性HDAC1的敲低所消除。

研究人员发现,SIRT1HDAC1相互作用,并且通过删除其催化活性所必需的SIRT1区域,这种相互作用大大增加。然而,SIRT1介导的保护不依赖于HDAC1脱乙酰酶活性。

尽管其他研究已经描述了SIRT1介导的催化活性具有神经保护作用,但最近的这项研究表明,在小脑颗粒神经元中,其脱乙酰酶活性并不重要,并且HDAC1有助于SIRT1的神经保护作用。


原始出处:

Pfister JA et al. Catalytic-independent neuroprotection by SIRT1 is mediated through interaction with HDAC1. PLOS ONE, 2019; doi: 10.1371/journal.pone.0215208. eCollection 2019.


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    2019-10-28 showtest
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    2019-04-15 quxin068
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    2019-04-14 一个字-牛

    学习了谢谢分享

    0

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    2019-04-14 坚强007

    向科研人员致敬!

    0

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    2019-04-13 天地飞扬

    了解一下,谢谢分享!

    0

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