The modulation and characterisation of the Ca(2+)-induced Ca2+ release mechanism in cultured human myometrial smooth muscle cells

FEBS Letters
J M Morgan, J I Gillespie

Abstract

The process of Ca(2+)-induced Ca2+ release (CICR) was studied in saponin permeabilised human myometrial smooth muscle cells in which the sarcoplasmic reticulum (SR) was pre-loaded with 45Ca2+. A rise in the free Ca2+ concentration of the bathing solution from 100 nM to 10 microM increased the rate of 45Ca2+ loss, while a reduction to 10 nM decreased the rate of 45Ca2+ loss. Ruthenium red (20 microM) lowered the basal rate of 45Ca2+ loss and reduced CICR. Caffeine did not activate 45Ca2+ release although ryanodine induced 45Ca2+ release and CICR was augmented in the presence of caffeine. These data suggest the operation of a Ca(2+)-activated 45Ca2+ release process which is similar in many of its properties to the CICR process described in many cells. The basic properties of the CICR mechanism in myometrium differs in many respects from the CICR process recently described in human vascular smooth muscle.

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Citations

Mar 1, 1996·Pflügers Archiv : European journal of physiology·J M MorganJ I Gillespie
May 27, 1997·Proceedings of the National Academy of Sciences of the United States of America·E N ChiniT P Dousa
Feb 27, 2004·Biology of Reproduction·T K ArakawaC A Ducsay
Aug 24, 1999·American Journal of Obstetrics and Gynecology·M J LuckasS Wray
Jul 16, 2002·Canadian Journal of Physiology and Pharmacology·Marguerite A StoutRik Casteels
Mar 20, 1999·Biology of Reproduction·R C BurghardtJ Andersen
Dec 17, 2004·Pharmacological Reviews·Régent LaporteIsmail Laher
Mar 10, 1999·The American Journal of Physiology·A YamadaY Imaizumi
Jun 5, 1998·The American Journal of Physiology·Y S PrakashG C Sieck
Mar 1, 1997·The American Journal of Physiology·Y S PrakashG C Sieck

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