Soluble amyloid precursor protein-α modulates β-secretase activity and amyloid-β generation.

Soluble amyloid precursor protein-α modulates β-secretase activity and amyloid-β generation.
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DOI:
10.1038/ncomms1781
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发表时间:
2012-04-10
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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--
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在与年龄相关的散发性阿尔茨海默病(AD)中,尚不清楚淀粉样β(Aβ)肽积聚的原因。在这里,我们发现可溶性淀粉样前体蛋白-α(sAPP-α)通过直接与BACE 1结合减少Aβ的产生,从而调节APP的加工。尽管使用抗体特异性靶向sAPP-α可增强Aβ的产生,但在具有AD样病理学的转基因小鼠中,sAPP-α过表达可减少β-淀粉样蛋白斑块和可溶性Aβ。作为支持,sAPP-α的免疫中和增加了这些小鼠中APP淀粉样蛋白的加工。鉴于我们目前的研究结果,并且由于散发性AD的许多风险因素有助于降低AD患者脑中sAPP-α的水平,因此sAPP-α水平不足可能足以使APP加工转向淀粉样蛋白生成、Aβ产生途径。因此,恢复sAPP-α或增强其与BACE的相关性可能是改善APP加工失衡的可行策略,这种失衡可能导致AD发病机制。
In sporadic age-related forms of Alzheimer’s disease (AD), it is unclear why amyloid-β (Aβ) peptides accumulate. Here, we show that soluble amyloid precursor protein-α (sAPP-α) decreases Aβ generation by directly associating with BACE1; thereby modulating APP processing. Whereas specifically targeting sAPP-α using antibodies enhances Aβ production, in transgenic mice with AD-like pathology, sAPP-α overexpression decreases β-amyloid plaques and soluble Aβ. In support, immunoneutralization of sAPP-α increases APP amyloidogenic processing in these mice. Given our current findings, and because a number of risk factors for sporadic AD serve to lower levels of sAPP-α in brains of AD patients, inadequate sAPP-α levels may be sufficient to polarize APP processing toward the amyloidogenic, Aβ-producing route. Therefore, restoration of sAPP-α or enhancement of its association with BACE may be viable strategies to ameliorate imbalances in APP processing that can lead to AD pathogenesis.
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