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. 1985 Aug;120(2):304–315.

Evidence for two calcium-dependent steps and a sodium-dependent step in the mechanism of cell killing by calcium ions in the presence of ionophore A23187.

W T Shier, D J Dubourdieu
PMCID: PMC1887830  PMID: 3927741

Abstract

Elevated intracellular Ca2+ appears to play an important role in the mechanism of cell killing in certain pathologic states such as ischemia. The authors have examined aspects of the biochemical mechanism of cell killing by elevated intracellular Ca2+ using as a model system cultured fibroblasts treated with ionophore A23187 in Ca2+-containing medium. Evidence has been obtained for two Ca2+-mediated steps and a Na+-mediated step in the cell killing process. The first Ca2+-mediated step occurs in low extracellular Ca2+ concentrations (1-100 microM) and exhibits a variety of characteristics in common with the arachidonic acid release response stimulated under the same conditions. These results are consistent with the arachidonic acid release response constituting or closely monitoring the initial injury process. The second Ca2+-mediated process is achieved at near physiologic extracellular Ca2+ concentrations in the absence of A23187. Killing of cells injured by the two Ca2+-dependent steps requires extracellular Na+ ions at half or more the physiologic concentration.

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Selected References

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