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Columnar activity regulates astrocytic β-adrenergic receptor-like immunoreactivity in V1 of adult monkeys

Published online by Cambridge University Press:  02 June 2009

Chiye Aoki
Affiliation:
Center for Neural Science, New York University, New York Center for Neural Scienc and Biology Dept., New York University, New York
Mona Lubin
Affiliation:
Center for Neural Science, New York University, New York
Suzanne Fenstemaker
Affiliation:
Center for Neural Science, New York University, New York

Abstract

Recent results indicate that astrocytic β-adrenergic receptors (βAR) participate in noradrenergic modulation of synaptic activity. In this study, we sought to examine whether neural activity can, in turn, regulate astrocytic βAR. To address this question, an antiserum that recognizes β-adrenergic receptors (βAR) specifically in astrocytes was used to assess the distribution of the receptors across ocular dominance columns in VI of two monocular and four visually intact adult monkeys. Cytochrome oxidase histochemistry (CO) was used to identify the position of the cortical laminae and of the ocular dominance columns receiving visual inputs from the intact and enucleated eyes. This stain revealed the expected pattern within V1 of monocular monkeys–i.e. darker and lighter bands of equal widths (ca. 500μm) spanning laminae 4–6, each associated with larger and smaller blobs, respectively, in lamina 2/3;. Alignment of CO sections with adjacent sections stained for astrocytic βAR by the immunoperoxidase method revealed intense βAR-like immunoreactivity (βAR-li) in the superficial laminae, a slightly weaker staining in the infragranular laminae and weakest staining in lamina 4C. Within lamina 4C., a prominent striped pattern was evident. The darker bands of the stripe closely matched widths and positions of the lighter CO columns associated with the enucleated eye. On the other hand, immunocytochemical staining for the astrocytic intermediate filament protein, GFAP, within V1 of monocular monkeys revealed no inter-columnar difference in the density of astrocytic cell bodies or processes. Nissl stain also revealed no overt inter-columnar differences in cell density. V1 of visually intact monkeys exhibited a similar laminar distribution pattern of βAR-li and of CO. Within lamina 4C., βAR-li was uniformly faint and CO staining was uniformly intense. This suggests that the striped pattern of βAR-li seen in lamina 4C of monocular monkeys results from elevation of the βAR-antigen within the inactive columns. The results indicate that astrocytic βAR density is regulated by local neural activity. The mechanisms regulating βAR density are likely to be independent of those regulating glial cell proliferation or GFAP synthesis. In vitro experimental results of others suggest that elevation of astrocytic βAR may be a mechanism compensating for chronic neural inactivity, since the coincident release of noradrenaline with visual stimulation would elevate neuropil excitability via the astrocytic mechanism of (1) decreasing the uptake of neuronally released L-glutamate; (2) increasing GABA uptake; and (3) stimulating glycogenolysis. Alternatively, the changes in βAR-li may reflect an up-regulation of the receptors within inactive columns due to reduced levels of noradrenaline release.

Type
Research Articles
Copyright
Copyright © Cambridge University Press 1994

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