Corelease of inhibitory neurotransmitters in the mouse auditory midbrain

Lucille A. Moore, Laurence Trussell

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The central nucleus of the inferior colliculus (ICC) of the auditory midbrain, which integrates most ascending auditory information from lower brainstem regions, receives prominent long-range inhibitory input from the ventral nucleus of the lateral lemniscus (VNLL), a region thought to be important for temporal pattern discrimination. Histological evidence suggests that neurons in the VNLL release both glycine and GABA in the ICC, but functional evidence for their corelease is lacking. We took advantage of the GlyT2-Cre mouse line (both male and female) to target expression of ChR2 to glycinergic afferents in the ICC and made whole-cell recordings in vitro while exciting glycinergic fibers with light. Using this approach, it was clear that a significant fraction of glycinergic boutons corelease GABA in the ICC. Viral injections were used to target ChR2 expression specifically to glycinergic fibers ascending from the VNLL, allowing for activation of fibers from a single source of ascending input in a way that has not been previously possible in the ICC. We then investigated aspects of the glycinergic versus GABAergic current components to probe functional consequences of corelease. Surprisingly, the time course and short-term plasticity of synaptic signaling were nearly identical for the two transmitters. We therefore conclude that the two neurotransmitters may be functionally interchangeable and that multiple receptor subtypes subserving inhibition may offer diverse mechanisms for maintaining inhibitory homeostasis.

Original languageEnglish (US)
Pages (from-to)9453-9464
Number of pages12
JournalJournal of Neuroscience
Volume37
Issue number39
DOIs
StatePublished - Sep 27 2017

Fingerprint

Inferior Colliculi
Mesencephalon
Neurotransmitter Agents
gamma-Aminobutyric Acid
Neuronal Plasticity
Patch-Clamp Techniques
Curriculum
Glycine
Brain Stem
Homeostasis
Neurons
Light
Injections
Pontine Tegmentum

Keywords

  • Corelease
  • GABA
  • Glycine
  • Inferior colliculus
  • Optogenetics

ASJC Scopus subject areas

  • Neuroscience(all)

Cite this

Corelease of inhibitory neurotransmitters in the mouse auditory midbrain. / Moore, Lucille A.; Trussell, Laurence.

In: Journal of Neuroscience, Vol. 37, No. 39, 27.09.2017, p. 9453-9464.

Research output: Contribution to journalArticle

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