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Cortical and Sub-Cortical Effects in Primate Models of Cocaine Use: Implications for Addiction and the Increased Risk of Psychiatric Illness

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Abstract

Drug abuse is a serious risk factor for the incidence and severity of multiple psychiatric illnesses. Understanding the neurobiological consequences of repeated exposure to abused drugs can help to inform how those risks are manifested in terms of specific neurochemical mechanisms and brain networks. This review examines selective studies in non-human primates that employed a cocaine self-administration model. Neurochemical consequences of chronic exposure appear to differ from observations in rodent studies. Whereas chronic intermittent exposure in the rodent is usually associated with a dose-dependent increase in dopaminergic response to a cocaine challenge, in the rhesus monkey, high cumulative exposure was not observed to cause a sensitized dopamine response. These non-human primate observations are concordant with clinical findings in human users. The results of cue exposure studies on dopaminergic transmission are also reviewed. Direct microdialysis measurements indicate that there is not a sustained increase in dopamine associated with cocaine-linked cues. As an alternative to striatal dopaminergic mechanisms mediating cue effects, single unit studies in prefrontal cortex during self-administration in monkeys suggests the orbitofrontal and anterior cingulate cortex are strongly engaged by cocaine cues. Based on the strong clinical imaging literature on cortical and cognitive dysfunction associated with addiction, it is proposed that the strong engagement of cortical systems during repeated cocaine reinforcement results in maladaptive changes that contribute to the risks of drug use for exacerbation of other psychiatric disorders.

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Acknowledgments

Support for the author’s work described in this review came from NIH/NIDA grants DA08073, DA04060, DA10331, and the Veterans Administration Medical Research Service.

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  1. Departments of Psychiatry and Neuroscience, University of Pittsburgh, VA Pittsburgh Health Services, 3501 Fifth Ave, Rm 4078, Pittsburgh, PA, 15261, USA

    Charles W. Bradberry

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Bradberry, C.W. Cortical and Sub-Cortical Effects in Primate Models of Cocaine Use: Implications for Addiction and the Increased Risk of Psychiatric Illness. Neurotox Res 19, 235–242 (2011). https://doi.org/10.1007/s12640-010-9156-4

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