Single Ca2+ channels and exocytosis at sensory synapses

Mean Hwan Kim, Geng Lin Li, Henrique Von Gersdorff

Research output: Contribution to journalArticle

25 Citations (Scopus)

Abstract

Hair cell synapses in the ear and photoreceptor synapses in the eye are the first synapses in the auditory and visual system. These specialized synapses transmit a large amount of sensory information in a fast and efficient manner. Moreover, both small and large signals with widely variable kinetics must be quickly encoded and reliably transmitted to allow an animal to rapidly monitor and react to its environment. Here we briefly review some aspects of these primary synapses, which are characterized by a synaptic ribbon in their active zones of transmitter release. We propose that these synapses are themselves highly specialized for the task at hand. Photoreceptor and bipolar cell ribbon synapses in the retina appear to have versatile properties that permit both tonic and phasic transmitter release. This allows them to transmit changes of both luminance and contrast within a visual field at different ambient light levels. By contrast, hair cell ribbon synapses are specialized for a highly synchronous form of multivesicular release that may be critical for phase locking to low-frequency sound-evoked signals at both low and high sound intensities. The microarchitecture of a hair cell synapse may be such that the opening of a single Ca2+ channel evokes the simultaneous exocytosis of multiple synaptic vesicles. Thus, the differing demands of sensory encoding in the eye and ear generate diverse designs and capabilities for their ribbon synapses.

Original languageEnglish (US)
Pages (from-to)3167-3178
Number of pages12
JournalJournal of Physiology
Volume591
Issue number13
DOIs
StatePublished - Jul 2013

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Exocytosis
Synapses
Ear
Photoreceptor Cells
Synaptic Vesicles
Visual Fields
Retina
Light

ASJC Scopus subject areas

  • Physiology
  • Medicine(all)

Cite this

Single Ca2+ channels and exocytosis at sensory synapses. / Kim, Mean Hwan; Li, Geng Lin; Von Gersdorff, Henrique.

In: Journal of Physiology, Vol. 591, No. 13, 07.2013, p. 3167-3178.

Research output: Contribution to journalArticle

Kim, Mean Hwan ; Li, Geng Lin ; Von Gersdorff, Henrique. / Single Ca2+ channels and exocytosis at sensory synapses. In: Journal of Physiology. 2013 ; Vol. 591, No. 13. pp. 3167-3178.
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