Enhanced behavioral response to repeated-dose cocaine in adolescent rats

Most lifelong drug addiction in humans originates during adolescence. Important structural and functional changes in the brain occur during adolescence, but there has been little direct study of how this impacts on drug abuse vulnerability. An emerging literature suggests that adolescents exhibit di...

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Veröffentlicht in:Psychopharmacologia 2005-12, Vol.183 (2), p.218-225
Hauptverfasser: CASTER, Joseph M, WALKER, Q. David, KUHN, Cynthia M
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WALKER, Q. David
KUHN, Cynthia M
description Most lifelong drug addiction in humans originates during adolescence. Important structural and functional changes in the brain occur during adolescence, but there has been little direct study of how this impacts on drug abuse vulnerability. An emerging literature suggests that adolescents exhibit different behavioral responses to single doses of several addictive drugs, including ethanol, amphetamine, and cocaine. However, few studies have explored behavioral responses to the repeated dosing that is characteristic of human abuse of these substances. We have investigated age-related behavioral responses to acute "binge" cocaine treatment between adults and adolescents. Adolescent rats displayed an exaggerated behavioral response to cocaine administered in two different binge patterns. Total locomotion after cocaine administration was the same in adolescents and adults. However, adolescent rats engaged in more intense stereotypic behaviors, including paw treading, head weaving, and focused sniffing than adult rats. These differences were observable following a modest dose of cocaine and became more robust following subsequent doses within a binge. Cocaine [corrected] brain levels were not significantly different between age groups during any of the exposure sessions. These findings suggest that equivalent tissue concentrations of cocaine produce a greater behavioral response in young rats, and that adolescent animals display an apparent form of intrabinge sensitization.
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These findings suggest that equivalent tissue concentrations of cocaine produce a greater behavioral response in young rats, and that adolescent animals display an apparent form of intrabinge sensitization.</abstract><cop>Berlin</cop><pub>Springer</pub><pmid>16175404</pmid><doi>10.1007/s00213-005-0159-4</doi><tpages>8</tpages></addata></record>
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subjects Age Factors
Analysis of Variance
Animals
Animals, Newborn
Behavior, Addictive - psychology
Behavior, Animal - drug effects
Biological and medical sciences
Brain - drug effects
Brain - metabolism
Cocaine - administration & dosage
Cocaine - blood
Dopamine Uptake Inhibitors - administration & dosage
Dose-Response Relationship, Drug
Drug addictions
Drug Administration Schedule
Locomotion - drug effects
Male
Medical sciences
Neuropharmacology
Pharmacology. Drug treatments
Psychoanaleptics: cns stimulant, antidepressant agent, nootropic agent, mood stabilizer..., (alzheimer disease)
Psychology. Psychoanalysis. Psychiatry
Psychopharmacology
Rats
Rats, Sprague-Dawley
Stereotyped Behavior - drug effects
Time Factors
Toxicology
title Enhanced behavioral response to repeated-dose cocaine in adolescent rats
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