The role of dopamine in alcohol self-administration in humans: individual differences.
Eur Neuropsychopharmacol
; 18(6): 439-47, 2008 Jun.
Article
em En
| MEDLINE
| ID: mdl-18367384
ABSTRACT
OBJECTIVE:
To clarify dopamine's role in alcohol self-administration in a heterogeneous sample of drinkers using acute phenylalanine/tyrosine depletion (APTD).METHODS:
Sixteen men with variable drinking histories were characterized on their ethanol-induced cardiac response, a marker previously proposed to index dopamine system reactivity and vulnerability to alcohol abuse. During separate sessions participants were administered (i) a nutritionally balanced (BAL) amino acid (AA) mixture, (ii) a mixture lacking the dopamine precursors, phenylalanine and tyrosine, and (iii) APTD followed by the dopamine precursor, L-DOPA. Five hours after AA administration, participants could earn units of alcohol using a progressive ratio breakpoint task.RESULTS:
Alcohol self-administration was reduced in the APTD and APTD+L-DOPA conditions relative to the BAL condition. In both cases the changes were predicted by ethanol-induced cardiac change.CONCLUSIONS:
The motivation to drink is likely regulated by more than one neurobiological mechanism. Individual differences in cardiac responsivity to ethanol might provide a peripheral marker of responsiveness to pharmacological manipulations of dopamine.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Consumo de Bebidas Alcoólicas
/
Dopamina
/
Etanol
/
Individualidade
Tipo de estudo:
Clinical_trials
/
Prognostic_studies
Limite:
Adult
/
Humans
/
Male
Idioma:
En
Revista:
Eur Neuropsychopharmacol
Assunto da revista:
PSICOFARMACOLOGIA
Ano de publicação:
2008
Tipo de documento:
Article
País de afiliação:
Canadá