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Unilateral frontal cortex ablation producing neglect causes time-dependent changes in striatal glutamate receptors.

Abstract：

:This study's goal is to identify adaptations involving striatal glutamate (GLU) or dopamine (DA) receptors that may contribute to recovery of function following cortical injury. Unilateral aspiration of the medial agranular region of frontal cortex (AGm) in rats produces neglect of contralateral stimuli. Pharmacological and immunocytochemical studies suggest that glutamatergic and dopaminergic processes within striatum may contribute to spontaneous recovery from this neglect. This study examined by autoradiography radioligand binding to striatal GLU and DA receptor subfamilies in AGm-ablated rats surviving 5 days (unrecovered) or 3 or more weeks (recovered) postsurgery. Density of radioligand binding was quantified in striatal subregions by computerized image analysis. Compared to striatal binding densities in the intact hemisphere, [3H]kainate binding and [3H]GLU binding to NMDA receptors were decreased in the lesioned hemisphere of unrecovered AGm-ablated rats, but normalized (for kainate) or increased (for NMDA) in the lesioned hemisphere of recovered rats. Ablation of AGm did not affect [3H]AMPA binding or the binding of [3H]SCH23390, [3H]spiperone, or [3H]mazindol to dopaminergic D1 or D2 receptor subfamilies, or to DA uptake sites, respectively. The results suggest that a small percentage of NMDA and kainate receptors are located on corticostriatal axon terminals, and that over time an upregulation of striatal NMDA and/or kainate receptors may offset the loss of cortical glutamatergic input caused by cortical injury. These time-dependent alterations in GLU receptors may contribute to the recovery of function and normalizations of immediate early gene expression seen weeks after AGm ablation. Upregulation of striatal dopamine receptors was not evident, and thus is unlikely to mediate recovery from neglect produced by cortical injury.

journal_name

Behav Brain Res

journal_title

Behavioural brain research

authors

Vargo JM,Marshall JF

doi

10.1016/0166-4328(95)00229-4

subject

Has Abstract

pub_date

1996-05-01 00:00:00

pages

189-99

issue

1-2

eissn

0166-4328

issn

1872-7549

pii

0166-4328(95)00229-4

journal_volume

77

pub_type

杂志文章

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