Abstract:
:Quantitative evaluation of gamma-aminobutyric acid immunoreactivity (GABA-IR) in the hindlimb representation of the rat somatosensory cortex after 14 days of exposure to hypergravity (hyper-G) was conducted by using computer-assisted image processing. The area of GABA-IR axosomatic terminals apposed to pyramidal cells of cortical layer V was reduced in rats exposed to hyper-G compared with control rats, which were exposed either to rotation alone or to vivarium conditions. Based on previous immunocytochemical and behavioral studies, we suggest that this reduction is due to changes in sensory feedback information from muscle receptors. Consequently, priorities for muscle recruitment are altered at the cortical level, and a new pattern of muscle activity is thus generated. It is proposed that the reduction observed in GABA-IR of the terminal area around pyramidal neurons is the immunocytochemical expression of changes in the activity of GABAergic cells that participate in reprogramming motor outputs to achieve effective movement control in response to alterations in the afferent information.
journal_name
J Neurosci Resjournal_title
Journal of neuroscience researchauthors
D'Amelio F,Wu LC,Fox RA,Daunton NG,Corcoran ML,Polyakov Idoi
10.1002/(SICI)1097-4547(19980715)53:2<135::AID-JNRsubject
Has Abstractpub_date
1998-07-15 00:00:00pages
135-42issue
2eissn
0360-4012issn
1097-4547pii
10.1002/(SICI)1097-4547(19980715)53:2<135::AID-JNRjournal_volume
53pub_type
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