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Neurobiol Dis. 1994 Nov;1(1-2):43-9.

Cortical neurones with Ca2+ permeable AMPA/kainate channels display distinct receptor immunoreactivity and are GABAergic.

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1
Department of Neurology, University of California Irvine, Irvine, California 92717-4290, USA.

Abstract

A minority subset of cortical neurones exhibit kainate-activated Co2+ uptake, a marker for AMPA/kainate receptor gated Ca2+-permeable channels. Consistent with enhanced Ca2+ influx through these channels, Co2+-positive neurones are unusually vulnerable to death induced by exposure to either AMPA or kainate. Here we show that Co2+-positive cortical neurones express a distinctive profile of AMPA receptor subunits as determined by immunostaining. Co2+-positive neurones were much less likely to express GluR2/GluR3, and much more likely to express GluR1 or GluR4, than the general cortical neuronal population. Thus expression of AMPA receptors lacking the GluR2 subunit may explain the Co2+ staining, and selective vulnerability to kainate exhibited by Co2+-positive cells. Almost all GABAergic neurones, identified by immunostaining for glutamic acid decarboxylase, were Co2+-positive. The widespread presence of Ca2+-permeable AMPA/kainate receptor-gated channels on cortical GABAergic neurones may have important implications for the fate of cortical inhibition in disease states associated with the excitotoxic overstimulation of glutamate receptors.

PMID:
9216985
[Indexed for MEDLINE]

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