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• W2102769905 abstract "Given evidence for age-related differences in the effects of drugs of abuse, surprisingly few preclinical studies have explored effects of opioids in adolescents (versus adults). This study compared the motor stimulating, ataxic, and hypothermic effects of morphine in adolescent, late adolescent, and adult mice. Plasma and brain levels of morphine were assessed to examine possible pharmacokinetic differences among the age groups. Locomotion was measured as occlusions of horizontal infrared light beams, ataxia as failing the horizontal wire test, body temperature by rectal probe, and morphine levels by HPLC-UV. Morphine (3.2–56 mg/kg, i.p.) increased locomotion along an inverted U-shaped dose–response curve in adolescent, late adolescent, and adult male C57BL/6J mice. Its potency to stimulate locomotion was similar in all age groups. However, maximal stimulation was higher in adolescents than in late adolescents, and higher in late adolescents than in adults. In contrast, adolescents showed less ataxia than adults when given morphine (5.6–100 mg/kg, i.p.). The hypothermic effects of morphine did not differ among the age groups. Morphine levels, which peaked in plasma at 15 min and in brain at 45 min after i.p. injection, did not show age-related differences. The finding that adolescents are not generally more sensitive to morphine than adults, but differ in their sensitivity to effects involving nigrostriatal/mesolimbic dopamine systems, is consistent with evidence of overactivity of these dopamine systems during adolescence relative to adulthood. The age-related differences observed here are unlikely due to pharmacokinetic factors." @default.
• W2102769905 created "2016-06-24" @default.
• W2102769905 creator A5054069135 @default.
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• W2102769905 date "2011-08-12" @default.
• W2102769905 modified "2023-09-26" @default.
• W2102769905 title "Morphine-induced motor stimulation, motor incoordination, and hypothermia in adolescent and adult mice" @default.
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• W2102769905 doi "https://doi.org/10.1007/s00213-011-2432-z" @default.
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