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- W1977029572 abstract "A number of esteratic local anesthetics serve as positive reinforcers and produce cocaine-like discriminative stimulus effects in animals. It has been suggested that the affinity of these compounds for a site on the dopamine transporter, and not their local anesthetic actions, is responsible for these abuse-related behavioral effects. In the present study, three local anesthetics previously shown to be self-administered in animals were examined in squirrel monkeys trained to discriminate cocaine (0.3 mg/kg) from saline in a two-lever, food-reinforced procedure. Dimethocaine (0.1–3.0 mg/kg) fully and dose-dependently substituted for cocaine. Doses of dimethocaine (1.7 mg/kg) and cocaine (0.3 mg/kg) which produced full (> 80%) substitution for cocaine were administered in combination with the dopamine D1 receptor antagonist SCH 39166 ((−)-trans-6,7,7a,8,9,13b-hexahydro-3-chloro-2-hydroxy-N-methyl-5H-benzo[d]naphtho-(2,1-b)azepine) and the dopamine D2 receptor antagonist raclopride (both at 0.003–0.03 mg/kg). SCH 39166 fully blocked the cocaine-like discriminative stimulus effects of dimethocaine and cocaine, but raclopride produced only partial antagonism of cocaine-lever selection. In addition, there was some evidence that raclopride blocked cocaine-lever responding produced by a lower dose of dimethocaine. In substitution studies, neither procaine (1–10 mg/kg) nor chloroprocaine (1–30 mg/kg) produced cocaine-like effects. These results support a role for dopamine in the behavioral effects of some local anesthetics." @default.
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- W1977029572 date "1995-02-01" @default.
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- W1977029572 title "Discriminative stimulus effects of esteratic local anesthetics in squirrel monkeys" @default.
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- W1977029572 doi "https://doi.org/10.1016/0014-2999(94)00733-n" @default.
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