Syntaxin 1A regulates dopamine transporter activity, phosphorylation and surface expression.

Syntaxin 1A regulates dopamine transporter activity, phosphorylation and surface expression.
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DOI:
10.1016/j.neuroscience.2010.07.025
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发表时间:
2010-10-13
期刊:
影响因子:
3.3
通讯作者:
Vaughan, R. A.
Vaughan, R. A.
中科院分区:
医学3区
文献类型:
--
作者:
Cervinski, M. A.;Foster, J. D.;Vaughan, R. A.

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本研究用肉毒毒素C(BoNT/C)处理大鼠纹状体组织,并与DAT共转染非神经细胞,研究SNARE蛋白合成素1A(Syn 1A)与多巴胺转运蛋白(DAT)的功能关系,并对其活性、磷酸化及调控进行分析。用BoNT/C处理纹状体脑片后,多巴胺(DA)转运Vmax升高,DAT磷酸化降低,而异源共表达syn 1A导致DAT表面表达和DAT转运Vmax降低。SYN 1A存在于DAT免疫沉淀复合体中,支持蛋白质之间的直接或间接相互作用。在经BoNT/C处理的突触体和syn 1a转基因细胞中,佛波酯对DA转运活性的调节仍然存在,表明PKC和syn 1a的作用是通过独立的过程发生的。这些发现揭示了一种新的调节DAT活性和磷酸化的机制,并提示syn 1A可能通过影响再摄取来影响DA神经传递。
We investigated the functional relationship between the SNARE protein syntaxin 1A (syn 1A) and the dopamine transporter (DAT) by treating rat striatal tissue with Botulinum Neurotoxin C (BoNT/C) and co-transfecting syn 1A with DAT in non-neuronal cells, followed by analysis of DAT activity, phosphorylation, and regulation. Treatment of striatal slices with BoNT/C resulted in elevated dopamine (DA) transport Vmax and reduced DAT phosphorylation, while heterologous co-expression of syn 1A led to reduction in DAT surface expression and transport Vmax. Syn 1A was present in DAT immunoprecipitation complexes, supporting a direct or indirect interaction between the proteins. Phorbol ester regulation of DA transport activity was retained in BoNT/C-treated synaptosomes and syn 1A transfected cells, demonstrating that PKC and syn 1A effects occur through independent processes. These findings reveal a novel mechanism for regulation of DAT activity and phosphorylation, and suggest the potential for syn 1A to impact DA neurotransmission through effects on reuptake.
DOI: 10.1074/jbc.m501969200
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