RRC ID 4113
Author Tabor R, Yaksi E, Friedrich RW.
Title Multiple functions of GABA A and GABA B receptors during pattern processing in the zebrafish olfactory bulb.
Journal Eur. J. Neurosci.
Abstract gamma-Aminobutyric acid (GABA)ergic synapses are thought to play pivotal roles in the processing of activity patterns in the olfactory bulb (OB), but their functions have been difficult to study during odor responses in the intact system. We pharmacologically manipulated GABA(A) and GABA(B) receptors in the OB of zebrafish and analysed the effects on odor responses of the output neurons, the mitral cells (MCs), by electrophysiological recordings and temporally deconvolved two-photon Ca2+ imaging. The blockade of GABA(B) receptors enhanced presynaptic Ca2+ influx into afferent axon terminals, and changed the amplitude and time course of a subset of MC responses, indicating that GABA(B) receptors have a modulatory influence on OB output activity. The blockade of GABA(A) receptors induced epileptiform firing, enhanced excitatory responses and abolished fast oscillations in the local field potential. Moreover, the topological reorganization and decorrelation of MC activity patterns during the initial phase of the response was perturbed. These results indicate that GABA(A) receptor-containing circuits participate in the balance of excitation and inhibition, the regulation of total OB output activity, the synchronization of odor-dependent neuronal ensembles, and the reorganization of odor-encoding activity patterns. GABA(A) and GABA(B) receptors are therefore differentially involved in multiple functions of neuronal circuits in the OB.
Volume 28(1)
Pages 117-27
Published 2008-7
DOI 10.1111/j.1460-9568.2008.06316.x
PMID 18616562
MeSH Animals Baclofen / metabolism Calcium / metabolism Food GABA Agonists / metabolism GABA Antagonists / metabolism Neural Pathways / anatomy & histology Neural Pathways / physiology Neurons / cytology Neurons / metabolism Odorants Olfactory Bulb / cytology Olfactory Bulb / metabolism* Organophosphorus Compounds / metabolism Patch-Clamp Techniques Pyridazines / metabolism Receptors, GABA-A / genetics Receptors, GABA-A / metabolism* Receptors, GABA-B / genetics Receptors, GABA-B / metabolism* Smell / physiology* Zebrafish / anatomy & histology Zebrafish / physiology
IF 2.784
Times Cited 23
Zebrafish Tg[HuC:Inverse-pericam]