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Impairment of inhibitory neurotransmission has been reported to occur in widespread, structurally intact brain regions after focal ischemic stroke. These long-lasting alterations contribute to the functional deficit and influence long-term recovery. Inhibitory neurotransmission is primarily mediated by γ-aminobutyric acid (GABA) A  receptors assembled of five subunits that allow a variety of adaptive changes. In this study, the regional distribution of five major GABA A -receptor subunits (α1, α2, α3, α5, and γ2) was analyzed immunohistochemically 1, 7, and 30 days after photochemically induced cortical infarcts. When compared with sham-operated controls, a general and regionally differential reduction in immunostaining was found within the cortex, hippocampus, and thalamus of both hemispheres for almost all subunits. Within ipsilateral and contralateral neocortical areas, a specific pattern of changes with a differential decrease of subunits α1, α2, α5, and γ2 and a significant upregulation of subunit α3 was observed in the contralateral cortex homotopic to the infarct. This dysregulation was most prominent at day 7 and still present at day 30. Interestingly, a single application of the noncompetitive N-methyl-D-aspartate–receptor antagonist MK-801 during lesion induction completely blocked these bihemispheric alterations. Cortical spreading depressions induced by topical application of KCl do not change GABA A -receptor subunit expression. As alterations in subtype distribution crucially influence inhibitory function, ischemia-induced modifications in GABA A -receptor subtype expression may be of relevance for functional recovery after stroke.

journal of cerebral blood flow and metabolism

Widespread and Long-Lasting Alterations in GABA<sub>A</sub>-Receptor Subtypes after Focal Cortical Infarcts in Rats: Mediation by NMDA-Dependent Processes

Widespread and Long-Lasting Alterations in GABAA-Receptor Subtypes after Focal Cortical Infarcts in Rats: Mediation by NMDA-Dependent Processes

Widespread and Long-Lasting Alterations in GABA_A-Receptor Subtypes after Focal Cortical Infarcts in Rats: Mediation by NMDA-Dependent Processes