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Abnormal BDNF signaling contributes to the structural and behavioral plasticity induced by drugs of abuse. However, the mechanisms regulating expression of  Bdnf  in drug addiction remain elusive. In the present study, using the conditioned place preference (CPP) model, we showed that expression of  Bdnf IV  is upregulated in the nucleus accumbens (NAc) of conditioned animals while  Bdnf I  is upregulated in cocaine-treated mice irrespective of conditioning. The methylation level of a putative c-MYB binding site in the promoter region of  Bdnf IV  was significantly decreased in the NAc under cocaine CPP conditioning but remained unchanged without conditioning, concurrently with increased binding of c-MYB to this site. Exon IV promoter/luciferase reporter assays revealed that transactivation of  Bdnf  by c-MYB was blocked by methylation of this c-MYB binding site. Administration of methionine, a precursor of SAM, inhibited cocaine CPP, reversed demethylation of c-MYB binding site and induction of  Bdnf IV  expression by cocaine CPP. Our results imply that  Bdnf IV  demethylation at c-MYB binding site is involved in cocaine-triggered seeking behavior, whereas  Bdnf I  responds to the immediate pharmacological effects of cocaine.

Demethylation of c-MYB binding site mediates upregulation of Bdnf IV in cocaine-conditioned place preference