Gain adjustment of inhibitory synapses in the auditory system

Vibhakar C. Kotak, Dan Sanes

Research output: Contribution to journalArticle

Abstract

A group of central auditory neurons residing in the lateral superior olivary nucleus (LSO) responds selectively to interaural level differences and may contribute to sound localization. In this simple circuit, ipsilateral sound increases firing of LSO neurons, whereas contralateral sound inhibits the firing rate via activation of the medial nucleus of the trapezoid body (MNTB). During development, individual MNTB fibers arborize within the LSO, but they undergo a restriction of their boutons that ultimately leads to mature topography. A critical issue is whether a distinct form of inhibitory synaptic plasticity contributes to MNTB synapse elimination within LSO. Whole-cell recording from LSO neurons in brain slices from developing gerbils show robust long-term depression (LTD) of the MNTB-evoked IPSP/Cs when the MNTB was activated at a low frequency (1 Hz). These inhibitory synapses also display mixed GABA/glycinergic transmission during development, as assessed physiologically and immunohistochemically (Kotak et al. 1998). While either glycine or GABAA receptors could independently display inhibitory LTD, focal delivery of GABA, but not glycine, at the postsynaptic-locus induces depression. Furthermore, the GABAB receptor antagonist, SCH-50911, prevents GABA or synaptically induced depression. Preliminary evidence also indicated strengthening of inhibitory transmission (LTP) by a distinct pattern of inhibitory activity. These data support the idea that GABA is crucial for the expression inhibitory LTD and that this plasticity may underlie the early refinement of inhibitory synaptic connections in the LSO.

Original languageEnglish (US)
Pages (from-to)363-370
Number of pages8
JournalBiological Cybernetics
Volume89
Issue number5
DOIs
StatePublished - Nov 2003

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Social Adjustment
Synapses
Neurons
Acoustic waves
gamma-Aminobutyric Acid
Plasticity
Amino acids
Topography
Brain
Chemical activation
Sound Localization
Depression
Glycine Receptors
Inhibitory Postsynaptic Potentials
Neuronal Plasticity
Gerbillinae
Networks (circuits)
Fibers
Patch-Clamp Techniques
GABA-A Receptors

ASJC Scopus subject areas

  • Biophysics

Cite this

Gain adjustment of inhibitory synapses in the auditory system. / Kotak, Vibhakar C.; Sanes, Dan.

In: Biological Cybernetics, Vol. 89, No. 5, 11.2003, p. 363-370.

Research output: Contribution to journalArticle

Kotak, Vibhakar C. ; Sanes, Dan. / Gain adjustment of inhibitory synapses in the auditory system. In: Biological Cybernetics. 2003 ; Vol. 89, No. 5. pp. 363-370.
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