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Journal of Neuroscience, Vol 15, 2030-2039, Copyright © 1995 by Society for Neuroscience
Spatial memory deficits, increased phosphorylation of the transcription factor CREB, and induction of the AP-1 complex following experimental brain injury
PK Dash, AN Moore and CE Dixon
Department of Neurobiology and Anatomy, University of Texas-Houston Health Science Center 77225.
Traumatic brain injury causes both short- and long-term neurological
impairments. A cascade of biochemical changes triggered by the injury may
increase the expression of several genes, which has been hypothesized to
contribute to the observed cognitive deficits. The mechanism(s) of
induction for these genes is not yet known. We present evidence that
lateral cortical impact injury in rats that produces spatial memory
deficits also increases phosphorylation of the transcription factor CREB
(cAMP response element binding). Subsequent to the phosphorylation of CREB,
c-Fos expression and the AP-1 complex are enhanced. The temporal and
spatial activation of c-Fos is consistent with it being induced by
phosphorylated CREB proteins. Thus, CREB-mediated gene activation may
contribute to the observed behavioral deficits. Further elucidation of the
biochemical and pathophysiological changes will be of importance for
clinical therapy.
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