Persistent supersensitivity of σ receptors develops during repeated methamphetamine treatment

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Abstract

Functional changes in σ receptors were examined after behavioral sensitization induced by repeated methamphetamine treatment. Rats received either saline or 4 mg/kg methamphetamine for 14 days. (+)3-(3-hydroxyphenyl)-N-(1-propyl)piperidine ((+)-3-PPP), a σ receptor agonist, was given as challenge after various periods of abstinence. (+)-3-PPP at doses greater than 6 mg/kg stimulated several forms of behavior in naive rats. (+)-3-PPP at 12 and 24 mg/kg produced more frequent rearing and more intense stereotyped sniffing and repetitive head movements in rats previously sensitized with methamphetamine than in saline-pretreated rats. The augmented response to (+)-3-PPP in methamphetamine-treated rats was maintained for at least one month. The augmented response to (+)-3-PPP was reversed by the combined administration of 100 mg/kg (±) sulpiride, a D2 dopamine receptor antagonist, and 30 mg/kg BMY 14802, a σ receptor antagonist. These results suggest that repeated methamphetamine treatment induces persistent supersensitivity in σ receptors and that it may subsequently activate the dopamine system.

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