PMID: 6249975Aug 1, 1980

The use of guinea pig K+-depolarized tracheal chain preparations in beta-adrenoceptor studies

Journal of Pharmacological Methods
S R O'Donnell, J C Wanstall

Abstract

Guinea pig tracheal chain preparations were K+-depolarized using Krebs solution in which all the Na+ was replaced by an equivalent amount of K+. This caused a sustained contraction of the preparations. Reproducible concentration-response (relaxation) curves to isoprenaline could be obtained provided that the preparations were repolarized by washing in normal Krebs solution between curves. pA2 values for propranolol (8.30) and butoxamine (5.89) were in good agreement with values obtained on other types of tracheal preparation. The maximum relaxation to salbutamol was less than that to isoprenaline and the maxima to both drugs were less than the maximum relaxation of the tissue (to papaverine). It is suggested that K+-depolarized tracheal preparations have no beta-adrenoceptor reserve and may, therefore, be useful in studies designed to compare the efficacies of beta-adrenoceptor agonists.

References

Dec 15, 1978·European Journal of Pharmacology·K D MeisheriJ H McNeill
Nov 1, 1967·British Journal of Pharmacology and Chemotherapy·H O SCHILD
Nov 1, 1973·European Journal of Pharmacology·B Johansson
Mar 1, 1959·British Journal of Pharmacology and Chemotherapy·O ARUNLAKSHANA, H O SCHILD

Related Concepts

Metazoa
Carboptic
Catecholamines
Cavia porcellus
Novodrin
Inotropism
Smooth Muscle
Z-Max
Potassium
Norepinephrine Receptors

Related Feeds

Adrenergic Receptors: Trafficking

Adrenergic receptor trafficking is an active physiological process where adrenergic receptors are relocated from one region of the cell to another or from one type of cell to another. Discover the latest research on adrenergic receptor trafficking here.