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Quantitative changes of GABA-immunoreactive cells in the hindlimb representation of the rat somatosensory cortex after 14-day hindlimb unloading by tail suspensionThe present study was aimed at evaluating quantitatively gamma-aminobutyric acid (GABA) immunoreactivity in the hindlimb representation of the rat somatosensory cortex after 14 days of hindlimb unloading by tail suspension. A reduction in the number of GABA-immunoreactive cells with respect to the control animals was observed in layer Va and Vb. GABA-containing terminals were also reduced in the same layers, particularly those terminals surrounding the soma and apical dendrites of pyramidal cells in layer Vb. On the basis of previous morphological and behavioral studies of the neuromuscular system of hindlimb-suspended animals, it is suggested that the unloading due to hindlimb suspension alters afferent signaling and feedback information from intramuscular receptors to the cerebral cortex due to modifications in the reflex organization of hindlimb muscle groups. We propose that the reduction in immunoreactivity of local circuit GABAergic neurons and terminals is an expression of changes in their modulatory activity to compensate for the alterations in the afferent information.
Document ID
20040173200
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
D'Amelio, F.
(San Jose State University Foundation California)
Fox, R. A.
Wu, L. C.
Daunton, N. G.
Date Acquired
August 22, 2013
Publication Date
June 15, 1996
Publication Information
Publication: Journal of neuroscience research
Volume: 44
Issue: 6
ISSN: 0360-4012
Subject Category
Aerospace Medicine
Distribution Limits
Public
Copyright
Other
Keywords
Non-NASA Center
NASA Center ARC
NASA Discipline Neuroscience

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