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Vol. 25, No. 6, 2003
Issue release date: November–December (February 2004)

Expression of c-fos in the Brain after Activation of L-Type Calcium Channels

Jinnah H.A. · Egami K. · Rao L. · Shin M. · Kasim S. · Hess E.J.
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In rodents, administration of the L-type calcium channel activators, ±Bay K 8644 and FPL 64176, causes an unusual neurobehavioral syndrome that includes dystonia and self-injurious biting. To determine the regional influence of these drugs in the brain, the induction of c-fos was mapped after administration of these drugs to mice. In situ hybridization with an antisense riboprobe directed to c-fos mRNA revealed widespread induction, with the highest levels in the striatum, cortex, hippocampus, locus coeruleus, and cerebellum. The induction of c-fos mRNA was dose dependent, reached maximal expression approximately 60 min after drug treatment, and could be blocked by pretreatment with the L-type calcium channel antagonist, nifedipine. Immunohistochemical stains with an antibody directed to c-fos protein revealed a pattern of induction similar to that obtained with in situ hybridization in most brain regions. These results demonstrate a very heterogeneous influence of L-type calcium channel activation in different brain regions, despite the nearly universal expression of these channels implied by more classical anatomical methods.

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