Abstract:
BACKGROUND:Psychostimulants and opiates trigger similar enduring neuroadaptations within the reward circuitry thought to underlie addiction. Transcription factors are key to mediating these enduring behavioral alterations. The facilitation of these maladaptive changes by glucocorticoid hormones suggests that the glucocorticoid receptor (GR), a transcription factor involved in the stress response, could be a common mediator of responses to pharmacologically distinct classes of abused drugs. METHODS:We employed mouse models carrying GR gene inactivation in either dopamine or dopaminoceptive neurons to determine the involvement of this transcription factor in behavioral responses to cocaine and morphine. We then combined microarray analysis, drug-elicited immediate early gene induction, and in vivo microdialysis to elucidate the molecular underpinnings of these responses. RESULTS:Inactivating GR within dopaminoceptive neurons markedly reduces cocaine-induced conditioned place preference and the expression of locomotor sensitization. In striking contrast, GR had no effect on behavioral morphine responses in either dopaminoceptive or dopamine neurons. The dopaminoceptive mutation engenders alterations in the expression of striatal genes that are implicated in glutamatergic transmission and plasticity. Within the nucleus accumbens, impaired cellular responses to cocaine are conspicuous; a pronounced deficit in cocaine-elicited extracellular dopamine release, expression of the key IEGs c-Fos and Zif268, and phosphorylation of extracellular signal-regulated kinases 1/2 in mutants were observed. In contrast, these molecular and neurochemical changes were not observed in response to morphine, mirroring the lack of effect on behavioral responses to morphine. CONCLUSION:Combined behavioral and molecular approaches have identified a subset of neurons in which GR differentially influences cocaine- and morphine-induced responses.
journal_name
Biol Psychiatryjournal_title
Biological psychiatryauthors
Barik J,Parnaudeau S,Saint Amaux AL,Guiard BP,Golib Dzib JF,Bocquet O,Bailly A,Benecke A,Tronche Fdoi
10.1016/j.biopsych.2010.03.037subject
Has Abstractpub_date
2010-08-01 00:00:00pages
231-9issue
3eissn
0006-3223issn
1873-2402pii
S0006-3223(10)00400-2journal_volume
68pub_type
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