Reelin mobilizes a VAMP7-dependent synaptic vesicle pool and selectively augments spontaneous neurotransmission.

Reelin mobilizes a VAMP7-dependent synaptic vesicle pool and selectively augments spontaneous neurotransmission.
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DOI:
10.1016/j.neuron.2013.08.024
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发表时间:
2013-11-20
期刊:
影响因子:
16.2
通讯作者:
Kavalali ET
Kavalali ET
中科院分区:
医学1区
文献类型:
--
作者:
Bal M;Leitz J;Reese AL;Ramirez DM;Durakoglugil M;Herz J;Monteggia LM;Kavalali ET

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Reelin是一种糖蛋白,在发育过程中对新皮层的适当分层以及成熟突触中的突触能突触后信号传导的动态调节至关重要。在这里,我们表明,Reelin也作用于突触前,导致强大的快速增强自发神经递质释放,而不影响诱发神经传递的特性。Reelin的这种作用需要通过ApoER 2信号传导启动的突触前Ca 2+的适度但显著的增加。Reelin对自发神经递质释放的作用的特异性在囊泡陷阱机制的水平上被编码,因为它需要VAMP 7和SNAP-25,而不需要突触小泡蛋白2、VAMP 4或vti 1a。这些结果揭示了一种新的突触前调节途径,利用突触囊泡相关的SNARE的异质性和选择性增强动作电位独立的神经传递。
Reelin is a glycoprotein that is critical for proper layering of neocortex during development as well as dynamic regulation of glutamatergic postsynaptic signaling in mature synapses. Here we show that Reelin also acts presynaptically, resulting in robust rapid enhancement of spontaneous neurotransmitter release without affecting properties of evoked neurotransmission. This effect of Reelin requires a modest but significant increase in presynaptic Ca2+ initiated via ApoER2 signaling. The specificity of Reelin action on spontaneous neurotransmitter release is encoded at the level of vesicular SNARE machinery as it requires VAMP7 and SNAP-25 but not synaptobrevin2, VAMP4 or vti1a. These results uncover a novel presynaptic regulatory pathway that utilizes the heterogeneity of synaptic vesicle associated SNAREs and selectively augments action potential-independent neurotransmission.
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