Extrasynaptic vesicle recycling in mature hippocampal neurons.

Extrasynaptic vesicle recycling in mature hippocampal neurons.
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成熟海马神经元的突触外囊泡回收。

DOI:
10.1038/ncomms1534
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发表时间:
2011
影响因子:
16.6
通讯作者:
Ratnayaka A
Ratnayaka A
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ratnayaka A

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快速的神经元信号依赖于高度调节的囊泡融合和再循环在专门的突触前末梢。最近,非经典神经传递的例子也被报道,其中囊泡的融合可以发生在远离常规突触的位点。这可能具有广泛的生物学意义,但其潜在机制尚未完全确立。在这里,我们表明,一个完整的囊泡回收途径可以发生在离散的轴突站点在成熟的海马神经元和突触外融合是一个强大的功能,天然组织。我们表明,横向移动的囊泡簇之间的突触末梢贩运成为暂时稳定的诱发动作电位,并进行完整的,但延迟的Ca 2+依赖的融合沿着轴突。这种融合与动态肌动蛋白积累有关,随后,囊泡可以局部回收,再酸化和再利用。免疫荧光和超微结构的工作表明,突触外融合网站可以有并列突触后专业化,表明移动的囊泡回收可能是高度动态的神经元-神经元通信的基础。
Fast neuronal signalling relies on highly regulated vesicle fusion and recycling at specialized presynaptic terminals. Recently, examples of non-classical neurotransmission have also been reported, where fusion of vesicles can occur at sites remote from conventional synapses. This has potentially broad biological implications, but the underlying mechanisms are not well established. Here we show that a complete vesicle recycling pathway can occur at discrete axonal sites in mature hippocampal neurons and that extrasynaptic fusion is a robust feature of native tissue. We demonstrate that laterally mobile vesicle clusters trafficking between synaptic terminals become transiently stabilized by evoked action potentials and undergo complete but delayed Ca2+-dependent fusion along axons. This fusion is associated with dynamic actin accumulation and, subsequently, vesicles can be locally recycled, re-acidified and re-used. Immunofluorescence and ultrastructural work demonstrates that extrasynaptic fusion sites can have apposed postsynaptic specializations, suggesting that mobile vesicle recycling may underlie highly dynamic neuron–neuron communication.
分享和分享:中央突触之间突触前元素的交换
DOI: --
发表时间: 2007
影响因子: 15.9
作者:
K. Staras
通讯作者: K. Staras
DOI: 10.1126/science.1553547
发表时间: 1992-01-10
期刊: SCIENCE
影响因子: 56.9
作者:
BETZ, WJ;BEWICK, GS
通讯作者: BEWICK, GS
DOI: 10.1016/s0896-6273(01)00243-4
发表时间: 2001-03-01
期刊: NEURON
影响因子: 16.2
作者:
Beutner, D;Voets, T;Moser, T
通讯作者: Moser, T
DOI: 10.1523/jneurosci.4518-07.2008
发表时间: 2008-02-20
影响因子: 5.3
作者:
Chen, Xi;Barg, Sebastian;Almers, Wolfhard
通讯作者: Almers, Wolfhard
DOI: 10.1126/science.1094682
发表时间: 2004-03-26
期刊: SCIENCE
影响因子: 56.9
作者:
Rizzoli, SO;Betz, WJ
通讯作者: Betz, WJ