Synaptic vesicle recycling studied in transgenic mice expressing synaptopHluorin

Zhiying Li, Juan Burrone, William J. Tyler, Kenichi N. Hartman, Dinu F. Albeanu, Venkatesh N. Murthy

Research output: Contribution to journalArticlepeer-review

131 Scopus citations


Synaptic vesicles are recycled locally within presynaptic specializations. We examined how vesicles are reused after endocytosis, using transgenic mice expressing the genetically encoded fluorescent indicator synaptopHluorin in subsets of neurons. At both excitatory and inhibitory synapses in cultured hippocampal neurons, newly endocytosed vesicles did not preferentially enter the releasable pool of vesicles. Rather, they entered the reserve pool first and subsequently the readily releasable pool over a period of several minutes. All vesicles in the recycling pool could be accessed by spaced stimuli, arguing against preferential local reuse of the readily releasable vesicles. Interestingly, nearly half the vesicles at excitatory synapses, and a third at inhibitory synapses, could not be recruited for release even by sustained stimuli. We conclude that, at presynaptic terminals in the hippocampus, most vesicles vacate release sites after exocytosis and are replaced by existing vesicles from the reserve pool, placing constraints on kiss-and-run recycling.

Original languageEnglish (US)
Pages (from-to)6131-6136
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number17
StatePublished - Apr 26 2005
Externally publishedYes


  • Endocytosis
  • Exocytosis
  • Hippocampus
  • Kiss and run

ASJC Scopus subject areas

  • General


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