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  Individual synaptic vesicles mediate stimulated exocytosis from cochlear inner hair cells.

Grabner, C., & Moser, T. (2018). Individual synaptic vesicles mediate stimulated exocytosis from cochlear inner hair cells. Proceedings of the National Academy of Sciences of the United States of America, 115(50), 12811-12816. doi:10.1073/pnas.1811814115.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0002-8DC1-5 Version Permalink: http://hdl.handle.net/21.11116/0000-0003-521A-4
Genre: Journal Article

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 Creators:
Grabner, C.1, Author              
Moser, T.1, Author              
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1Research Group of Synaptic Nanophysiology, MPI for Biophysical Chemistry, Max Planck Society, ou_2205655              

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Free keywords: membrane capacitance; multivesicular release; ribbon synapse; synaptic efficiency; univesicular release
 Abstract: Spontaneous excitatory postsynaptic currents (sEPSCs) measured from the first synapse in the mammalian auditory pathway reach a large mean amplitude with a high level of variance (CV between 0.3 and 1). This has led some to propose that each inner hair cell (IHC) ribbon-type active zone (AZ), on average, releases ∼6 synaptic vesicles (SVs) per sEPSC in a coordinated manner. If true, then the predicted change in membrane capacitance (Cm) for such multivesicular fusion events would equate to ∼300 attofarads (aF). Here, we performed cell-attached Cm measurements to directly examine the size of fusion events at the basolateral membrane of IHCs where the AZs are located. The frequency of events depended on the membrane potential and the expression of Cav1.3, the principal Ca2+-channel type of IHCs. Fusion events averaged 40 aF, which equates to a normal-sized SV with an estimated diameter of 37 nm. The calculated SV volumes showed a high degree of variance (CV > 0.6). These results indicate that SVs fused individually with the plasma membrane during spontaneous and evoked release and SV volume may contribute more variability in EPSC amplitude than previously assumed.

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Language(s): eng - English
 Dates: 2018-11-21
 Publication Status: Published online
 Pages: -
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 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1073/pnas.1811814115
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Title: Proceedings of the National Academy of Sciences of the United States of America
Source Genre: Journal
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Pages: - Volume / Issue: 115 (50) Sequence Number: - Start / End Page: 12811 - 12816 Identifier: -