M3/M1-Selective antimuscarinic tropinyl and piperidinyl esters.
Eur J Pharm Sci
; 8(1): 39-47, 1999 Apr.
Article
em En
| MEDLINE
| ID: mdl-10072477
ABSTRACT
The binding affinities of some tropinyl and piperidinyl esters for the submandibulary glands (M3/M1) and heart ventricle (M2) were determined from displacement experiments using 3H-labelled N-methylscopolamine as radioligand. The antimuscarinic activities of these esters were also evaluated on guinea pig bronchi. The esters inhibited the M3-mediated carbachol-induced contraction of the bronchial smooth muscle and a reasonable correlation was obtained between the binding affinities of the esters for the submandibulary glands (pKM3,M1) and their inhibitory activities (pIC50) on guinea pig bronchi. A promising compound, N-methylpiperidinyl cyclohexylphenylpropionate (NCPP) which combined good antimuscarinic activity (pA2=9.34) with a 20-fold selectivity at the M3/M1 receptors, was identified. Quantitative structure-activity relationships (QSAR) showed that the size of the ester was the main structural feature determining both binding affinity for the M3/M1 receptors and inhibitory activity on guinea pig bronchi. Esters with substituted acyl side chains (fewer hyperconjugable H atoms at the alpha-carbon) are generally associated with better activity and affinity.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Piperidinas
/
Tropanos
/
Receptores Muscarínicos
/
Antagonistas Muscarínicos
Tipo de estudo:
Diagnostic_studies
Limite:
Animals
Idioma:
En
Revista:
Eur J Pharm Sci
Assunto da revista:
FARMACIA
/
FARMACOLOGIA
/
QUIMICA
Ano de publicação:
1999
Tipo de documento:
Article
País de afiliação:
Singapura