Striatal dopaminergic and serotonergic markers in human heroin users.
Neuropsychopharmacology
; 24(5): 561-7, 2001 May.
Article
em En
| MEDLINE
| ID: mdl-11282256
ABSTRACT
To establish whether chronic opiate exposure might impair brain dopaminergic or serotonergic function in humans, we assessed biochemical indices of monoaminergic neurotransmitter activity and integrity in post mortem striatum of nine chronic heroin users and 14 control subjects. Striatal levels of the vesicular monoamine transporter were normal, suggesting that the density of dopamine nerve terminals is not reduced in heroin users. In nucleus accumbens, levels of tyrosine hydroxylase protein (-25%) and those of the dopamine metabolite homovanillic acid (-33%) were reduced significantly together with a trend for decreased dopamine (-32%) concentration. These changes could reflect either a compensatory downregulation of dopamine biosynthesis in response to prolonged dopaminergic stimulation caused by heroin, or reduced axoplasmic transport of tyrosine hydroxylase. Striatal levels of serotonin were either normal or elevated whereas concentrations of the serotonin metabolite 5-hydroxyindoleacetic acid were decreased by 27-38%. Our data suggest that chronic heroin exposure might produce a modest reduction in dopaminergic and serotonergic activity that could affect motivational state and impulse control, respectively.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Contexto em Saúde:
2_ODS3
/
8_ODS3_consumo_sustancias_psicoactivas
Problema de saúde:
2_sustancias_psicoativas
/
8_opioid_abuse
Assunto principal:
Proteínas de Membrana Transportadoras
/
Neuropeptídeos
/
Biomarcadores
/
Dopamina
/
Serotonina
/
Neostriado
/
Dependência de Heroína
/
Proteínas do Tecido Nervoso
/
Neurônios
Limite:
Adult
/
Female
/
Humans
/
Male
Idioma:
En
Revista:
Neuropsychopharmacology
Assunto da revista:
NEUROLOGIA
/
PSICOFARMACOLOGIA
Ano de publicação:
2001
Tipo de documento:
Article
País de afiliação:
Canadá