A role for SC35 and hnRNPA1 in the determination of amyloid precursor protein isoforms.

A role for SC35 and hnRNPA1 in the determination of amyloid precursor protein isoforms.
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DOI:
10.1038/sj.mp.4001971
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发表时间:
2007-07
影响因子:
11
通讯作者:
Sheer, D.
Sheer, D.
中科院分区:
医学1区
文献类型:
--
作者:
Donev, R.;Newall, A.;Thome, J.;Sheer, D.

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阿尔茨海默病老年斑中积累的 β-淀粉样肽 (Aβ) 是由淀粉样前体蛋白 (APP) 裂解形成的。 APP 基因具有多个以有义或反义方向插入的内含子 Alu 元件。在本研究中,我们证明 SC35 和 hnRNPA1 与转录前 mRNA 中外显子 7 两侧 Alu 元件的结合参与了 APP 外显子 7 和 8 的选择性剪接。用全长形式 APP 转染的神经元细胞比用缺乏外显子 7 和 8 的 APP695 同种型转染的细胞分泌更高水平的 Aβ。最后,我们表明用 雌二醇导致 APP695、SC35、hnRNPA1 表达增加,并降低分泌的 Aβ 水平。了解 APP 剪接的调控可能有助于确定治疗阿尔茨海默病的新靶点。
The β-amyloid peptide (Aβ) that accumulates in senile plaques in Alzheimer’s disease is formed by cleavage of the Amyloid Precursor Protein (APP). The APP gene has several intronic Alu elements inserted in either the sense or antisense orientation. In this study, we demonstrate that binding of SC35 and hnRNPA1 to Alu elements on either side of exon 7 in the transcribed pre-mRNA is involved in alternative splicing of APP exons 7 and 8. Neuronal cells transfected with the full-length form of APP secrete higher levels of Aβ than cells transfected with the APP695 isoform lacking exons 7 and 8. Finally, we show that treatment of neuronal cells with estradiol results in increased expression of APP695, SC35, hnRNPA1, and lowers the level of secreted Aβ. An understanding of the regulation of splicing of APP may lead to the identification of new targets for treating Alzheimer’s disease.
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