Abstract
These experiments examined the neurochemical mechanisms involved in the development and expression of place conditioning produced by heroin. Conditioned place preferences (CPP) lasting up to 8 weeks were obtained with doses of 50–1000 μg/kg heroin, using a regimen shown not to produce physical dependence. Naloxone pretreatment (50 μg/kg) during conditioning prevented the acquisition of heroin-induced CPP, but when given only on the test day, naloxone (50 or 1000 μg/kg) did not prevent the expression of heroin CPP. Clonidine disrupted the establishment of heroin CPP at 20 μg/kg, but disrupted its expression only at debilitating doses (100 and 200 μg/kg). Pimozide attenuated the acquisition (100 μ/kg) and expression (250 μg/kg) of heroin CPP. Together, these results support a role for opioid and catecholamine systems in the acquisition of heroin reinforcement, but they suggest that once heroin CPP is established, its expression in opiate-free subjects is not opiate receptor mediated and is relatively refractory to pharmacological treatments which disrupt acquisition. The data challenge the notion that the conditioned effects of opiates in drug-free animals are related to the release of endogenous opioids, and they also may help to explain why naloxone and clonidine are ineffective in the treatment of opiate addiction.
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Hand, T.H., Stinus, L. & Le Moal, M. Differential mechanisms in the acquisition and expression of heroin-induced place preference. Psychopharmacology 98, 61–67 (1989). https://doi.org/10.1007/BF00442007
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DOI: https://doi.org/10.1007/BF00442007