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C. elegans Punctin指定了后突触域的胆固醇与GABAergic特征

Bérangère Pinan-Lucarré¹, Haijun Tu¹, Marie Pierron²

¹1] Institute of Biology, École Normale Supérieure, 75005 Paris, France [2] University Claude Bernard Lyon 1, CGphiMC UMR CNRS 5534, 69622 Villeurbanne, France [3].

|June 5, 2014

概括

神经蛋白Ce-Punctin通过指定刺激性或抑制性后突触域来组织突触连接. 它的删除会破坏神经递质受体的局部化,突出其在突触组织中的作用和与神经系统疾病的潜在联系.

科学领域:

神经科学是一个神经科学.
分子生物学分子生物学
遗传学是一个遗传学.

背景情况:

神经元接收成千上万的突触输入,形成神经递质受体的专门微域.
涉及神经激素和神经激素等蛋白质的跨突触相互作用协调突触前和突触后分化.
在Caenorhabditis elegans神经肌肉结 (NMJ) 提供了一个可操作的模型研究神经递质受体分离由于混合内化.

研究的目的:

调查Ce-Punctin/madd-4在C. elegans NMJ中确定突触后认同中的作用.
确定Ce-Punctin异型如何影响激发性和抑制性突触的组织.
探索ADAMTS类蛋白在哺乳动物突触组织中的潜在功能.

主要方法:

在C. elegans中遗传删除Ce-Punctin.
使用显微镜分析神经递质受体局部化 (乙胆和GABAA).
研究由替代促进体产生的不同Ce-Punctin异型的功能.
在特定的神经元类型中Ce-Punctin异型的错误表达.

主要成果:

脱离Ce-Punctin会导致突触性乙胆和GABAA受体重新分布到突触外部位.
由替代促进体产生的独特的Ce-Punctin异型具有特定的功能和局部化模式.
短Ce-Punctin异型表达在胆固醇和GABAergic神经元中,而长异型则特定于胆固醇神经元.
Ce-Punctin异型的差异表达控制了前突触和后突触域之间的一致性,并有可能脱.

结论:

Ce-Punctin作为一个新的突触组织者,指定后突触域身份.
预突触和后突触域身份可以在生物体中从遗传上脱离.
像ADAMTS这样的蛋白质,包括哺乳动物的点-2,可能在中枢神经系统的突触组织中起着保留的作用.

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