Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 97, Issue 2, Pages 883-888Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.97.2.883
Keywords
-
Categories
Ask authors/readers for more resources
Hearing in mammals relies on the highly synchronous synaptic transfer between cochlear inner hair cells (IHCs) and the auditory nerve. We studied the presynaptic function of single mouse IHCs by monitoring membrane capacitance changes and voltage-gated Ca2+ currents, Exocytosis initially occurred at a high rate but then slowed down within a few milliseconds, despite nearly constant Ca2+ influx. We interpret the observed secretory depression as depletion of a readily releasable pool (RRP) of about 280 vesicles. These vesicles are probably docked close to Ca2+ channels at the ribbon-type active zones of the IHCs, Continued depolarization evoked slower exocytosis occurring at a nearly constant rate for at least 1 s and depending on long-distance Ca2+ signaling. Refilling of the RRP after depletion followed a biphasic time course and was faster than endocytosis. RRP depletion is discussed as a mechanism for fast auditory adaptation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available