A three-pool model dissecting readily releasable pool replenishment at the calyx of held.

A three-pool model dissecting readily releasable pool replenishment at the calyx of held.
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三池模型在持有的花萼处解剖易于释放的池补充。

DOI:
10.1038/srep09517
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发表时间:
2015-03-31
期刊:
影响因子:
4.6
通讯作者:
Xue L
Xue L
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Guo J;Ge JL;Hao M;Sun ZC;Wu XS;Zhu JB;Wang W;Yao PT;Lin W;Xue L

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虽然囊泡的补充是至关重要的,在维持外吞内吞循环,其潜在的机制还没有很好地理解。以前的研究表明,快速和缓慢的内吞循环到一个非常大的循环池,而不是在容易释放池(RRP)和RRP补充的时间过程减慢更强烈的刺激。这一发现与RRP补充的钙/钙调素依赖性相矛盾。在这里,我们解决这个问题,并报告一个三池模型RRP补充在中央突触。快速和缓慢的内吞作用都为大的储备池(RP)提供了囊泡,约为RRP大小的42.3倍。当从RP移动到RRP时,囊泡进入中间池(IP),大小约为RRP的2.7倍,具有缓慢的RP-IP动力学和快速的IP-RRP动力学,这是RRP补充的成熟缓慢和快速组分的原因。在强烈刺激后观察到IP的消耗导致RRP补充较慢。这些结果首次建立了一个真实的循环模型,测量了所有参数,揭示了突触传递中每个循环步骤的贡献。结果要求修改目前的看法囊泡回收的步骤和它们的作用。
Although vesicle replenishment is critical in maintaining exo-endocytosis recycling, the underlying mechanisms are not well understood. Previous studies have shown that both rapid and slow endocytosis recycle into a very large recycling pool instead of within the readily releasable pool (RRP) and the time course of RRP replenishment is slowed down by more intense stimulation. This finding contradicts the calcium/calmodulin-dependence of RRP replenishment. Here we address this issue and report a three-pool model for RRP replenishment at a central synapse. Both rapid and slow endocytosis provide vesicles to a large reserve pool (RP) ~42.3 times the RRP size. When moving from the RP to the RRP, vesicles entered an intermediate pool (IP) ~2.7 times the RRP size with slow RP-IP kinetics and fast IP-RRP kinetics, which was responsible for the well-established slow and rapid components of RRP replenishment. Depletion of the IP caused the slower RRP replenishment observed after intense stimulation. These results establish, for the first time, a realistic cycling model with all parameters measured, revealing the contribution of each cycling step in synaptic transmission. The results call for modification of the current view of the vesicle recycling steps and their roles.
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