In vitro down-regulation predicts agonist efficacy at central muscarinic cholinergic receptors.
Biochem Pharmacol
; 41(12): 1963-6, 1991 Jun 15.
Article
em En
| MEDLINE
| ID: mdl-2039547
ABSTRACT
Agonist induced short-term down-regulation of central muscarinic cholinergic receptors in mechanically dissociated cells of the mouse brain has been shown to predict the efficacy of agonists at muscarinic receptors. Pretreatment of cells with full agonists such as carbachol or oxotremorine M resulted in a loss of available muscarinic cholinergic receptors of about 30% using [3H]N-methylscopolamine [( 3H]NMS) as radioligand, whereas a second group of agonists e.g. RS 86 were only weakly active in this regard producing a significantly smaller loss of cell surface muscarinic cholinergic receptors. The magnitude of down-regulation of muscarinic receptors induced by pretreatment with several cholinergic drugs correlates fairly well with their ability to stimulate the phosphatidylinositol turnover. It seems that the agonist induced down-regulation of muscarinic cholinergic receptors on mechanically dissociated neurons of the mouse brain is a simple screening method to test for centrally acting cholinergic agonists.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Parassimpatomiméticos
/
Regulação para Baixo
/
Receptores Muscarínicos
Tipo de estudo:
Prognostic_studies
/
Risk_factors_studies
Limite:
Animals
Idioma:
En
Revista:
Biochem Pharmacol
Ano de publicação:
1991
Tipo de documento:
Article