SNAREs Controlling Vesicular Release of BDNF and Development of Callosal Axons.

SNAREs Controlling Vesicular Release of BDNF and Development of Callosal Axons.
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DOI:
10.1016/j.celrep.2015.04.032
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发表时间:
2015-05-19
期刊:
影响因子:
8.8
通讯作者:
Maximov A
Maximov A
中科院分区:
生物学1区
文献类型:
--
作者:
Shimojo M;Courchet J;Pieraut S;Torabi-Rander N;Sando R 3rd;Polleux F;Maximov A

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在突触前活跃区,神经递质囊泡(SVs)的胞吐是由网罗Syb2和SNAP25的SNARE复合物驱动的。然而,目前尚不清楚SNAREs促进神经元蛋白的分泌,包括那些对回路发育和经验依赖的可塑性至关重要的蛋白。本研究表明,Syb2和SNAP25介导皮层神经元轴突和树突中BDNF的囊泡释放,表明这些SNAREs在多个空间分离的分泌途径中起作用。值得注意的是,BDNF的轴突分泌也受到SNAP47的强烈调节,SNAP47与SNAP25相互作用,但似乎对sv的胞外分泌是必不可少的。在体内,SNAP47的细胞自主消融破坏了投射皮质神经元胼胝体轴突的层特异性分支,这种表型通过BDNF或其受体TrkB的消融重现。我们的研究结果揭示了蛋白质分泌的分子机制,并定义了SNAREs在BDNF信号传导和神经元连接调节中的功能。
At presynaptic active zones, exocytosis of neurotransmitter vesicles (SVs) is driven by SNARE complexes that recruit Syb2 and SNAP25. However, it remains unknown which SNAREs promote the secretion of neuronal proteins, including those essential for circuit development and experience-dependent plasticity. Here, we demonstrate that Syb2 and SNAP25 mediate the vesicular release of BDNF in axons and dendrites of cortical neurons, suggesting these SNAREs act in multiple spatially-segregated secretory pathways. Remarkably, axonal secretion of BDNF is also strongly regulated by SNAP47 which interacts with SNAP25 but appears to be dispensable for exocytosis of SVs. Cell-autonomous ablation of SNAP47 disrupts the layer-specific branching of callosal axons of projection cortical neurons in vivo, and this phenotype is recapitulated by ablation of BDNF or its receptor, TrkB. Our results provide insights into the molecular mechanisms of protein secretion and define the functions of SNAREs in BDNF signaling and regulation of neuronal connectivity.
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