Time-course of changes in striatal levels of DA uptake sites, DA D2 receptor and preproenkephalin mRNAs after nigrostriatal dopaminergic denervation in the rat.
Brain Res Mol Brain Res
; 19(4): 318-22, 1993 Sep.
Article
em En
| MEDLINE
| ID: mdl-8231735
ABSTRACT
Changes in striatal dopamine uptake sites, D2 receptor and preproenkephalin (PPE) mRNA levels provoked by unilateral 6-hydroxydopamine-induced lesion of the nigrostriatal dopaminergic (DA) pathway were studied by quantitative autoradiography and in situ hybridization (ISH) in rats sacrificed at different post-lesion delays. The disappearance of DA terminals as visualized with the labelling of dopamine uptake sites with [3H]GBR 12935 became significant 36 h after the lesion and was almost complete at a delay of 7 days. PPE mRNA amounts significantly increase (+24%) already at the shortest delay studied (9 h after the lesion) while the labelling of the uptake sites on DA terminals was not affected. The time course increase of PPE mRNA levels was progressive until 21 days post-lesion where it reached its maximum (+132%) and remained stable up to the latest delay studied (60 days). Conversely D2 mRNA contents remained unchanged up to 5 days post-surgery and then increased relatively quickly since at 7 days post-lesion their levels were near (+21%) the maximum observed which was reached at 21 days post-lesion (+32%). This study suggests a time-dependent differential sensitivity to the degree of DA denervation of both major components implicated in the striatopallidal output.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Precursores de Proteínas
/
RNA Mensageiro
/
Encefalinas
/
Substância Negra
/
Dopamina
/
Receptores de Dopamina D2
/
Corpo Estriado
Limite:
Animals
Idioma:
En
Revista:
Brain Res Mol Brain Res
Assunto da revista:
BIOLOGIA MOLECULAR
/
CEREBRO
Ano de publicação:
1993
Tipo de documento:
Article
País de afiliação:
França