TDP-43 interaction with the intracellular domain of amyloid precursor protein induces p53-associated apoptosis

TDP-43 interaction with the intracellular domain of amyloid precursor protein induces p53-associated apoptosis
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TDP-43 与淀粉样前体蛋白胞内结构域相互作用诱导 p53 相关细胞凋亡

DOI:
10.1016/j.neulet.2014.03.075
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发表时间:
2014-05
影响因子:
2.5
通讯作者:
Ma, Quan-Hong
Ma, Quan-Hong
中科院分区:
医学4区
文献类型:
--
作者:
Chen, Li-Hua;Wen, Zhong-Min;Zhao, He-Qing;Ma, Quan-Hong

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TAR DNA结合蛋白43(TDP-43)是肌萎缩性迟发性硬化症(ALS)和额颞叶变性(FTLD)的重要病理蛋白,在阿尔茨海默病(AD)中异常表达。然而,TDP-43是否以及如何参与AD的发病机制仍不清楚。我们在这里已经显示了TDP-43和APP的细胞内结构域(AICD)在细胞核中的共定位。免疫共沉淀分析显示TDP-43与AICD之间存在相互作用。TDP-43在COS 7细胞中的过表达增强了APP-Gal 4荧光素酶报告系统中AICD的反式激活。实时荧光定量PCR分析显示,与TDP-43转染或AICD转染的细胞相比,HEK 293细胞中TDP-43和AICD共转染增加了P53 mRNA水平。此外,与TDP-43转染或AICD转染的细胞相比,在N2 a或COS 7细胞中共转染TDP-43和AICD显示凋亡细胞数量增加,表明TDP-43增强了N2 a或COS 7细胞中AICD介导的凋亡。因此,TDP-43可能通过与AICD相互作用在AD病理学中发挥作用。
TAR DNA-binding protein 43 (TDP-43), an essential pathological protein in both amyotrophic later sclerosis (ALS) and frontotemporal lobar degeneration (FTLD), is expressed abnormally in Alzheimer's disease (AD). However, whether and how TDP-43 contributes the pathogenesis of AD remains unknown. We have shown here a colocalization between TDP-43 and the intracellular domain of APP (AICD) in the nucleus. Coimmunoprecipitation analysis showed an interaction between TDP-43 and AICD. Overexpression of TDP-43 in COS7 cells enhanced the transactivation of AICD in an APP-Gal4 luciferase reporter system. Real-time PCR analysis showed that cotransfection of TDP-43 and AICD in HEK293 cells increased P53 mRNA levels compared to either TDP-43-transfected or AICD-transfected cells. Moreover, cotransfection of TDP-43 and AICD in either N2a or COS7 cells showed increased numbers of apoptotic cells compared to either TDP-43-transfected or AICD-transfected cells, indicating that TDP-43 enhances AICD-mediated apoptosis in N2a or COS7 cells. Thus, TDP-43 may play a role in AD pathology through interaction with AICD.
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