Abstract
Impulsivity shares high comorbidity with substance abuse in humans, and high impulsivity (HI) in rats has been identified as a predictive factor for cocaine addiction-like behavior. Despite the evidence that high impulsivity is associated with altered function of corticostriatal networks, the specific neural substrates underlying the increased vulnerability of impulsive individuals to develop cocaine addiction remain unknown. We therefore investigated specific neural correlates of HI within the corticostriatal circuitry and determined how they interact with a protracted history of cocaine self-administration. We used in situ hybridization to map brain expression of two major genes implicated in impulsivity, encoding the dopamine D2 receptor (DA D2R) and the 5-HT2c receptor (5-HT2cR), and an immediate early gene associated with neuronal plasticity, zif268, in groups of rats selected for HI and low impulsivity (LI) on a 5-choice serial reaction time task (5-CSRTT) immediately after 5-CSRTT training, and following 10 or 50 days of cocaine self-administration. HI rats exhibited decreased DA D2R mRNA in the mesolimbic pathway, and increased 5-HT2cR mRNA in the orbitofrontal cortex compared with LI rats. HI rats also showed decreased zif268 mRNA in the ventral and dorsomedial striatum. Cocaine exposure decreased striatal D2R mRNA in both HI and LI rats, decreased 5-HT2cR mRNA differentially in striatal and prefrontal areas between HI and LI rats, and selectively decreased zif268 mRNA in the orbitofrontal and infralimbic cortices of HI animals. These findings implicate novel markers underlying the vulnerability of impulsive rats to cocaine addiction that localize to the OFC, infralimbic cortex, and striatum.
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Acknowledgements
This study was supported by the MRC (G9536855, G1002231 and G0701500) and by a joint core award from the MRC and Wellcome Trust (MRC G1000183; WT 093875/Z/10/Z) in support of the Behavioural and Clinical Neuroscience Institute at Cambridge University. MB was supported by an EMBO fellowship. DB and ABR were supported by an INSERM AVENIR Grant, the AXA research fund, the fondation pour la recherche médicale (FRM), and the IREB. AL was supported by a Wellcome Trust Programme Grant (089589/Z/09/Z). We thank Mercedes Arroyo for technical assistance with the in situ hybridization experiments.
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Besson, M., Pelloux, Y., Dilleen, R. et al. Cocaine Modulation of Frontostriatal Expression of Zif268, D2, and 5-HT2c Receptors in High and Low Impulsive Rats. Neuropsychopharmacol 38, 1963–1973 (2013). https://doi.org/10.1038/npp.2013.95
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DOI: https://doi.org/10.1038/npp.2013.95
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