A new method for measuring the kinetics of transmembrane calcium-45 efflux in the smooth muscle of the guinea pig tanea coli

Phil Aaronson, C. van Breemen, R. Loutzenhiser, Michael A Kolber

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

A simple technique has been developed for resolving cellular 45Ca efflux from intestinal smooth muscle into two exponential components. Strips of taenia coli from guinea pig are labeled with 45Ca for three hours and then washed in an ice-cold, oxygenated medium containing 5 mM CaEGTA and 1.5 mM excess Ca2+ for 40 minutes in order to remove extracellularly bound label. Tissues subsequently placed in a control physiological solution at 37°C exhibit an efflux profile of 45Ca which can be resolved into two exponential components. The apparent magnitudes and rate constants of these components are sensitive to ionic alterations of the medium and to biochemical manipulation of the Ca2+ compartmentalization within the cells.

Original languageEnglish
Pages (from-to)1781-1789
Number of pages9
JournalLife Sciences
Volume25
Issue number21
DOIs
StatePublished - Nov 19 1979

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Ice
Smooth Muscle
Muscle
Labels
Rate constants
Guinea Pigs
Colon
Tissue
Calcium
Kinetics

ASJC Scopus subject areas

  • Pharmacology

Cite this

A new method for measuring the kinetics of transmembrane calcium-45 efflux in the smooth muscle of the guinea pig tanea coli. / Aaronson, Phil; van Breemen, C.; Loutzenhiser, R.; Kolber, Michael A.

In: Life Sciences, Vol. 25, No. 21, 19.11.1979, p. 1781-1789.

Research output: Contribution to journalArticle

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