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The Journal of Neuroscience, March 1, 1998, 18(5):1693-1703
Segregation of Different GABAA Receptors to Synaptic
and Extrasynaptic Membranes of Cerebellar Granule Cells
Zoltan
Nusser1,
Werner
Sieghart2, and
Peter
Somogyi1
1 Medical Research Council, Anatomical
Neuropharmacology Unit, Department of Pharmacology, University of
Oxford; Oxford OX1 3TH, United Kingdom, and 2 Section of
Biochemical Psychiatry, University Clinic for Psychiatry, A-1090
Vienna, Austria
Two types of GABAA receptor-mediated inhibition (phasic
and tonic) have been described in cerebellar granule cells, although these cells receive GABAergic input only from a single cell type, the
Golgi cell. In adult rats, granule cells express six GABAA receptor subunits abundantly ( 1, 6, 2, 3, 2, and ),
which are coassembled into at least four to six distinct
GABAA receptor subtypes. We tested whether a differential
distribution of GABAA receptors on the surface of granule
cells could play a role in the different forms of inhibition, assuming
that phasic inhibition originates from the activation of synaptic
receptors, whereas tonic inhibition is provided mainly by extrasynaptic
receptors. The 1, 6, 2/3, and 2 subunits have been found by
immunogold localizations to be concentrated in GABAergic Golgi synapses
and also are present in the extrasynaptic membrane at a lower
concentration. In contrast, immunoparticles for the subunit could
not be detected in synaptic junctions, although they were abundantly
present in the extrasynaptic dendritic and somatic membranes. Gold
particles for the 6, 2, and 2/3, but not the 1 and ,
subunits also were concentrated in some glutamatergic mossy fiber
synapses, where their colocalization with AMPA-type glutamate receptors was demonstrated. The exclusive extrasynaptic presence of the subunit-containing receptors, together with their kinetic properties, suggests that tonic inhibition could be mediated mainly by
extrasynaptic 6 2/3
receptors, whereas phasic inhibition is attributable to the activation
of synaptic
1 2/3 2,
6 2/3 2, and
1 6 2/3 2 receptors.
Key words:
neurotransmission; cerebellum; inhibition; synapse; ion
channel; immunocytochemistry
Copyright © 1998 Society for Neuroscience 0270-6474/98/1851693-11$05.00/0
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