Scopolamine self-administration: Cholinergic involvement in reward mechanisms |
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Authors: | Stanley D Glick Ronald A Guido |
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Institution: | Department of Pharmacology, Mount Sinai School of Medicine City University of New York, One Gustave L. Levy Place New York, N.Y. 10029, USA |
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Abstract: | Naive rats readily learned to self-administer scopolamine, a centrally active anticholinergic antimuscarinic agent, by the intravenous route; drug intake remained constant while response rates decreased with increasing unit dose ((0.005–0.02 mg/kg/infusion). Increases and decreases in scopolamine responding were elicited by pretreatment with muscarinic agonists and antagonists, respectively. An anticholinergic action at muscarinic synapses appears to be sufficient for reinforcing efficacy; such an action may mediate, in part, the addictive properties of other drugs (e.g., opiates and phencyclidine-like hallucinogens) that are known to have anticholinergic effects. |
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