Synapto-depressive effects of amyloid beta require PICK1.

Synapto-depressive effects of amyloid beta require PICK1.
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DOI:
10.1111/ejn.12499
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发表时间:
2014-04
期刊:
The European journal of neuroscience
影响因子:
--
通讯作者:
Malinow R
Malinow R
中科院分区:
其他
文献类型:
--
作者:
Alfonso S;Kessels HW;Banos CC;Chan TR;Lin ET;Kumaravel G;Scannevin RH;Rhodes KJ;Huganir R;Guckian KM;Dunah AW;Malinow R

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β淀粉样蛋白(Aβ)是阿尔茨海默病病理生理学的关键成分,被认为在疾病早期靶向兴奋性突触。然而,Aβ削弱突触的机制还不清楚。在这里,我们发现PDZ结构域蛋白,与C激酶1(PICK 1)相互作用的蛋白质,是Aβ削弱突触所必需的。在缺乏PICK 1的小鼠中,Aβ的升高未能抑制培养的脑切片中的突触传递。在分离培养的神经元中,Aβ未能减少表面GluA 2,这是α-氨基-3-羟基-5-甲基-4-异恶唑丙酸受体的一个亚基,通过PDZ配体-结构域相互作用与PICK 1结合。最后,通过基于结构的药物设计发现的一种新型小分子(BIO 922)靶向GluA 2和PICK 1之间的特异性相互作用,阻断了Aβ对突触和表面受体的作用。我们得出结论,GluA 2-PICK 1相互作用是Aβ对突触作用的关键组成部分。
Amyloid beta (Aβ), a key component in the pathophysiology of Alzheimer’s disease, is thought to target excitatory synapses early in the disease. However, the mechanism by which Aβ weakens synapses is not well understood. Here we showed that the PDZ domain protein, protein interacting with C kinase 1 (PICK1), was required for Aβ to weaken synapses. In mice lacking PICK1, elevations of Aβ failed to depress synaptic transmission in cultured brain slices. In dissociated cultured neurons, Aβ failed to reduce surface GluA2, a subunit of α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptors that binds with PICK1 through a PDZ ligand–domain interaction. Lastly, a novel small molecule (BIO922) discovered through structure-based drug design that targets the specific interactions between GluA2 and PICK1 blocked the effects of Aβ on synapses and surface receptors. We concluded that GluA2–PICK1 interactions are a key component of the effects of Aβ on synapses.
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