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• W2129502009 abstract "Neurochemical studies indicate that methamphetamine increases central serotonin (5-HT) levels more markedly than other psychomotor stimulants such as amphetamine or cocaine. In the present study, we investigated 5-HT involvement in the discriminative stimulus effects of methamphetamine. In Sprague-Dawley rats trained to discriminate 1.0 mg/kg methamphetamine i.p. from saline under a fixed-ratio schedule of food presentation, the effects of selected 5-HT agonists, antagonists, and uptake inhibitors were tested. Fluoxetine (1.8-18.0 mg/kg) and clomipramine (3.0-18.0 mg/kg), selective serotonin uptake inhibitors, did not produce any methamphetamine-like discriminative stimulus effects when administered alone, but fluoxetine (5.6 mg/kg), unlike clomipramine (5.6 mg/kg), significantly shifted the methamphetamine dose-response curve to the left. Both 8-hydroxy-2-dipropylaminotetralin (0.03-0.56 mg/kg), a full agonist, and buspirone (1.0-10.0 mg/kg), a partial agonist at 5-HT(1A) receptors, partially generalized to the training dose of methamphetamine but only at high doses that decreased response rate. This generalization was antagonized by the coadministration of the 5-HT(1A) antagonist WAY-100635 (1.0 mg/kg). WAY-100635 (1.0 mg/kg) also partially reversed the leftward shift of the methamphetamine dose-response curve produced by fluoxetine. (+/-)-1-(2, 5-Dimethoxy-4-iodophenyl)-2-aminopropane (0.3 mg/kg), a 5-HT(2A/2C) agonist, shifted the methamphetamine dose-response curve to the left, and this leftward shift was antagonized by the coadministration of ketanserin (3.0 mg/kg), a 5-HT(2A/2C) antagonist. Ketanserin (3.0 mg/kg) also produced a shift to the right in the methamphetamine dose-response curve and completely reversed the leftward shift in the methamphetamine dose-response curve produced by fluoxetine. In contrast, tropisetron (1.0 mg/kg), a 5-HT(3) antagonist, produced a shift to the left of the methamphetamine dose-response curve, and this effect of tropisetron was antagonized by the coadministration of m-chlorophenyl-biguanide (1.8 mg/kg), a 5-HT(3) agonist. The present data suggest that the 5-HT system plays a modulatory role in the discriminative stimulus effects of methamphetamine. These effects appear to be mediated through 5-HT release and blockade of reuptake and subsequent activation of 5-HT(2A/2C) receptors, with limited involvement of other 5-HT receptor subtypes." @default.
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• W2129502009 date "1999-10-01" @default.
• W2129502009 modified "2023-10-17" @default.
• W2129502009 title "Effects of various serotonin agonists, antagonists, and uptake inhibitors on the discriminative stimulus effects of methamphetamine in rats." @default.
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