Striatal regulation of ΔFosB, FosB, and cFos during cocaine self-administration and withdrawal.

Journal of Neurochemistry
Erin B LarsonDavid W Self

Abstract

Chronic drug exposure induces alterations in gene expression profiles that are thought to underlie the development of drug addiction. The present study examined regulation of the Fos-family of transcription factors, specifically cFos, FosB, and ΔFosB, in striatal subregions during and after chronic intravenous cocaine administration in self-administering and yoked rats. We found that cFos, FosB, and ΔFosB exhibit regionally and temporally distinct expression patterns, with greater accumulation of ΔFosB protein in the nucleus accumbens (NAc) shell and core after chronic cocaine administration, whereas ΔFosB increases in the caudate-putamen (CPu) remained similar with either acute or chronic administration. In contrast, tolerance developed to cocaine-induced mRNA for ΔFosB in all three striatal subregions with chronic administration. Tolerance also developed to FosB expression, most notably in the NAc shell and CPu. Interestingly, tolerance to cocaine-induced cFos induction was dependent on volitional control of cocaine intake in ventral but not dorsal striatal regions, whereas regulation of FosB and ΔFosB was similar in cocaine self-administering and yoked animals. Thus, ΔFosB-mediated neuroadaptations in the CPu may occur earli...Continue Reading

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