Most vesicles in a central nerve terminal participate in recycling

Lei Xue, Jiansong Sheng, Xin Sheng Wu, Wei Wu, Fujun Luo, Wonchul Shin, Hsueh Cheng Chiang, Ling Gang Wu

Research output: Contribution to journalArticlepeer-review

17 Citations (Scopus)

Abstract

Studies over the last decade using FM dyes to label vesicles at many terminals, including the calyx-type nerve terminal, led to a well accepted "principle" that only a small fraction of vesicles (5-20%) participate in recycling under physiological conditions. This principle imposes a large challenge in maintaining synaptic transmission during repetitive firing, because the small recycling pool may limit the number of available vesicles for release and nerve terminals would have to distinguish the recycling pool from the reserve pool and keep reserve pool vesicles from being used. By recording the presynaptic capacitance changes and the postsynaptic EPSC at rat calyx of Held synapses in the absence or presence of transmitter glutamate in nerve terminals, we developed a new method to count functional recycling vesicles. We found that essentially all vesicles in calyces participated in recycling, challenging the small-recycling-pool principle established by FM dye labeling. Nerve terminals may use all available vesicles to maximize their ability in maintaining synaptic transmission during repetitive firing.

Original languageEnglish
Pages (from-to)8820-8826
Number of pages7
JournalJournal of Neuroscience
Volume33
Issue number20
DOIs
Publication statusPublished - 2013 May 15

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

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