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Brain Res Mol Brain Res. 1994 Aug;25(1-2):168-72.

Differential induction of Fos protein and a Fos-related antigen following acute and repeated cocaine administration.

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Biological Psychiatry Branch, National Institute of Mental Health, National Institute of Dental Research, Bethesda, MD 20892.


The present study examined the effects of a single and five once daily injections of cocaine on the expression of c-fos mRNA, Fos protein and Fos-related antigens (Fra) in the striatum. A single injection (40 mg/kg, i.p.), which induces locomotion, increased the expression of c-fos mRNA, Fos protein and a 35 kDa Fra. In contrast, five injections (40 mg/kg, i.p.) given once a day, which induces even more behavioral stimulation, diminished the increase in c-fos mRNA and Fos protein expression. However, the cocaine-induced Fra expression was sustained and not reduced after the five injections. The results demonstrate that cocaine-induced expression of the Fos/Fra gene family is dynamic and the profile of gene transcription and translation in the striatum changes when animals are behaviorally more sensitive to cocaine.

[Indexed for MEDLINE]

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