PRRT2 Mutant Leads to Dysfunction of Glutamate Signaling.

PRRT2 Mutant Leads to Dysfunction of Glutamate Signaling.
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PRRT2 突变导致谷氨酸信号传导功能障碍

DOI:
10.3390/ijms16059134
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发表时间:
2015-04-23
影响因子:
5.6
通讯作者:
Liu Y
Liu Y
中科院分区:
生物学2区
文献类型:
--
作者:
Li M;Niu F;Zhu X;Wu X;Shen N;Peng X;Liu Y

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发作性运动性舞蹈病(PKC)是一种遗传性神经系统疾病。我们先前发现PRRT2是PKC的致病基因。然而,由于对PRRT2的功能知之甚少,阐明它的功能不仅有助于PKC的研究,而且还有助于许多其他相关疾病的研究。在这里,我们发现在Prrt2基因敲除表达后,PKC患者的血浆和神经元培养液中的谷氨酸水平更高。免疫组织化学双重染色证实Prrt2定位于谷氨酸能神经元,与其功能一致。我们的免疫共沉淀实验表明,突变的PRRT2分别干扰了SNAP25和GRIA1的相互作用。此外,利用活标记技术,我们证实了与突变型PRRT2共转染导致GRIA1在细胞表面的分布增加。因此,我们的结果提示,突变型PRRT2可能通过减弱与SNAP25的相互作用,影响谷氨酸信号转导和谷氨酸受体活性,导致谷氨酸释放增加,从而导致神经元的超兴奋性。
Paroxysmal kinesigenic choreoathetosis (PKC) is an inherited disease of the nervous system. We previously identified PRRT2 as the causative gene of PKC. However, as little is known about the function of PRRT2, elucidating its function will benefit not only PKC studies, but also many other related disorders. Here, we reveal higher levels of glutamate in the plasma of PKC patients and the culture medium of neurons following knock-out Prrt2 expression. Using double immunostaining assays we confirm Prrt2 is located at the glutamatergic neurons in accordance with its function. Our co-immunoprecipitation assays reveal mutant PRRT2 interferes with SNAP25 and GRIA1 interactions, respectively. Furthermore, using live-labeling techniques, we confirmed co-transfection with mutant PRRT2 caused an increase in GRIA1 distribution on the cell surface. Therefore, our results suggest that mutant PRRT2, probably through its weakened interaction with SNAP25, affects glutamate signaling and glutamate receptor activity, resulting in the increase of glutamate release and subsequent neuronal hyperexcitability.
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影响因子: 5.6
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