Characterization of voltage dependent calcium channels on the lateral olivocochlear efferent fibers of the guinea pig

Anita Gáborján, E. Vízi

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Using in vitro superfusion technique the release of [3H]-dopamine from the lateral olivocochlear efferent fibers of the cochlea was investigated. Our previous study gave the first neurochemical evidence for the transmitter role of dopamine and proved its neuronal origin. Using specific antagonists now we characterized the voltage-dependent calcium channels (VDCCs) involved in the release of dopamine evoked by electrical stimulation of the cochlear tissue. Verapamil or nifedipine, and Ni2+ failed to affect the release, indicating that neither L-, nor T-type VDCCs are essential for the release process. The fact that ω-conotoxin inhibited the release of dopamine from lateral olivocochlear efferent fibers suggests, that N-type VDCCs are required for the calcium influx during electrical stimulation. These VDCCs could be presynaptic targets of modulation of the dopamine release under pathological conditions or in therapy.

Original languageEnglish
Pages (from-to)49-51
Number of pages3
JournalNeuroscience Letters
Volume269
Issue number1
DOIs
Publication statusPublished - Jul 2 1999

Fingerprint

Calcium Channels
Dopamine
Guinea Pigs
Cochlea
Electric Stimulation
T-Type Calcium Channels
N-Type Calcium Channels
Conotoxins
Nifedipine
Verapamil
Calcium

Keywords

  • Dopamine release
  • In vitro superfusion
  • Lateral olivocochlear efferents
  • Voltage-dependent calcium channels

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Characterization of voltage dependent calcium channels on the lateral olivocochlear efferent fibers of the guinea pig. / Gáborján, Anita; Vízi, E.

In: Neuroscience Letters, Vol. 269, No. 1, 02.07.1999, p. 49-51.

Research output: Contribution to journalArticle

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