SIRT1 Deacetylates SC35 and Suppresses Its Function in Tau Exon 10 Inclusion.

SIRT1 Deacetylates SC35 and Suppresses Its Function in Tau Exon 10 Inclusion.
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SIRT1 使 SC35 脱乙酰并抑制其在 Tau 外显子 10 包含中的功能。

DOI:
10.3233/jad-170418
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发表时间:
2017-12
期刊:
Journal of Alzheimer's Disease
影响因子:
--
通讯作者:
Wei Qian
Wei Qian
中科院分区:
其他
文献类型:
--
作者:
Xiaomin Yin;Xiaosu Jiang;Jia Wang;Shuo Qian;Fei Liu;Wei Qian

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由tau外显子10的选择性剪接产生的大约等量的3R-tau和4R-tau是维持正常脑功能所必需的。tau外显子10的选择性剪接失调和3R-tau/4R-tau的不平衡已经在遗传性和散发性tau病中发现。剪接因子SC35(也称为SRSF2)在促进tau外显子10的包含中起重要作用。SC35在翻译后被磷酸化和乙酰化修饰,但乙酰化在SC35治疗的tau外显子10包合中的作用尚不清楚。Sirtuin 1型(SIRT1)是一种蛋白质去乙酰化酶,与老年痴呆症等年龄相关疾病有关。在本研究中,我们确定了SIRT1在SC35乙酰化和tau外显子10的选择性剪接中的作用。我们发现SIRT1与SC35相互作用并使SC35去乙酰化,并抑制SC35促进的tau外显子10包合。用精氨酸取代SC35的K52残基会损害SC35在tau蛋白外显子10包合中的作用。这些结果表明SIRT1可能通过调节sc35介导的tau外显子10剪接作为tau病的治疗靶点。
Approximately equal amounts of 3R-tau and 4R-tau resulting from alternative splicing of tau exon 10 is necessary to maintain normal brain function. Dysregulation of alternative splicing of tau exon 10 and the imbalance of 3R-tau/4R-tau have been seen in inherited and sporadic tauopathies. Splicing factor SC35 (also name as SRSF2) plays an important role in promoting tau exon 10 inclusion. SC35 is post-translationally modified by phosphorylation and acetylation, but the role of acetylation in SC35-medicated tau exon 10 inclusion is unknown. Sirtuin type 1 (SIRT1) is an enzyme that deacetylates proteins and associates with age-related disease such as Alzheimer's disease. In the present study, we determined the role of SIRT1 in SC35 acetylation and in the alternative splicing of tau exon 10. We found that SIRT1 interacts with and deacetylates SC35, and inhibits SC35-promoted tau exon 10 inclusion. Substituting K52 residue of SC35 by arginine impairs the role of SC35 in tau exon 10 inclusion. These results suggest that SIRT1 may serve as a therapeutic target for tauopathy by regulating SC35-mediated tau exon 10 splicing.
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