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Cocaine self-administration by rats is inhibited by cyclic GMP-elevating agents: involvement of epigenetic markers.
MedLine Citation:
PMID:  23375146     Owner:  NLM     Status:  Publisher    
The C-type natriuretic peptide (CNP) exerts its action via stimulation of the cyclic GMP (cGMP) signalling pathway, which includes the activation of cGMP-dependent protein kinases. The pathway can also be activated by inhibitors of phosphodiesterases (PDE) that hydrolyse cGMP. The present report shows that activation of the cGMP pathway by CNP, by bromo-cGMP, a cell-permeant cGMP analogue, or by the PDE inhibitor zaprinast dose dependently reduces intravenous cocaine self-administration by rats. The effect was found when the compounds were injected in situ into the prefrontal cortex, but not when they were injected into the nucleus accumbens. A decrease in the number of cocaine infusions performed by rats was obtained under the fixed ratio-1 schedule of reinforcement as well as under a progressive ratio schedule, which evaluates the motivation of the animals for the drug. Decrease in cocaine self-administration was accompanied with reduced expression of the epigenetic markers methyl-CpG-binding protein 2 (MeCP2) and histone deacetylase 2 (HDAC2) in dopaminergic projection areas. An increase in the acetylation level of histone H3, but not of histone H4, was also noticed. Since MeCP2 and HDAC2 are known to modulate dynamic functions in the adult brain, such as synaptic plasticity, our results showing that activation of the cGMP signal transduction pathway decreased both cocaine intake and expression of the epigenetic markers strongly suggest that the MeCP2/HDAC2 complex is involved in the analysis of the reinforcing properties of cocaine in the prefrontal cortex.
Elodie Deschatrettes; Pascal Romieu; Jean Zwiller
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-2-4
Journal Detail:
Title:  The international journal of neuropsychopharmacology / official scientific journal of the Collegium Internationale Neuropsychopharmacologicum (CINP)     Volume:  -     ISSN:  1469-5111     ISO Abbreviation:  Int. J. Neuropsychopharmacol.     Publication Date:  2013 Feb 
Date Detail:
Created Date:  2013-2-4     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9815893     Medline TA:  Int J Neuropsychopharmacol     Country:  -    
Other Details:
Languages:  ENG     Pagination:  1-11     Citation Subset:  -    
Laboratoire de Neurosciences Cognitives et Adaptatives, Université de Strasbourg, Strasbourg, France.
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