Department of Anesthesiology

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Single-vesicle imaging reveals that synaptic vesicle exocytosis and endocytosis are coupled by a single stochastic mode.

TitleSingle-vesicle imaging reveals that synaptic vesicle exocytosis and endocytosis are coupled by a single stochastic mode.
Publication TypeJournal Article
Year of Publication2007
AuthorsBalaji J, Ryan TA
JournalProc Natl Acad Sci U S A
Volume104
Issue51
Pagination20576-81
Date Published2007 Dec 18
ISSN1091-6490
KeywordsAnimals, Cells, Cultured, Endocytosis, Exocytosis, Green Fluorescent Proteins, Microscopy, Fluorescence, Photobleaching, Rats, Rats, Sprague-Dawley, Synaptic Vesicles
Abstract

The nature of synaptic vesicle recycling at nerve terminals has been a subject of considerable debate for >35 years. Here, we report the use of an optical strategy that allows the exocytosis and retrieval of synaptic components to be tracked in real time at single-molecule sensitivity in living nerve terminals. This approach has allowed us to examine the recycling of synaptic vesicles in response to single action potentials. Our results show that, after exocytosis, individual synaptic vesicles are retrieved by a stochastic process with an exponential distribution of delay times, with a mean time of approximately 14 s. We propose that evidence for fast endocytosis, such as that proposed to support the presence of kiss-and-run, is likely explained by the stochastic nature of a slower process.

DOI10.1073/pnas.0707574105
Alternate JournalProc. Natl. Acad. Sci. U.S.A.
PubMed ID18077369
PubMed Central IDPMC2154473
Grant ListR01 NS036942 / NS / NINDS NIH HHS / United States