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. 1998 Jan;152(1):231–240.

Intracellular Ca2+ thresholds that determine survival or death of energy-deprived cells.

Z Dong 1, P Saikumar 1, G A Griess 1, J M Weinberg 1, M A Venkatachalam 1
PMCID: PMC1858134  PMID: 9422540

Abstract

Increase of intracellular ionized or free Ca2+ is thought to play a central role in cell death due to ATP depletion. However, concurrently operative mechanisms of injury that do not require intracellular Ca2+ increases have made it difficult to test this hypothesis or to determine the concentrations at which intracellular Ca2+ becomes lethal. The predominant Ca2+-independent mechanism of injury during ATP depletion involves the loss of cellular glycine. This type of damage can be fully inhibited by adding the amino acid exogenously. Using glycine to suppress Ca2+-independent plasma membrane damage, we have examined the effect of intracellular Ca2+ elevations on cell viability during ATP depletion. Madin-Darby canine kidney (MDCK) cells were depleted of ATP by incubation with a mitochondrial uncoupler in glucose-free medium. Free Ca2+ concentration in the medium was varied between 26 nmol/L and 1.25 mmol/L in the presence of a Ca2+ ionophore. Measurements with the Ca2+ probes fura-2, furaptra, and fura-2FF showed that intracellular Ca2+ was clamped at extracellular levels under these conditions. Cell survival during ATP depletion was indicated by viable cells recovered 24 hours later. The results show that ATP-depleted cells can sustain high levels of intracellular Ca2+ (100 micromol/L) for prolonged periods and remain viable if plasma membrane damage is prevented by glycine. Cell death was observed only when intracellular free Ca2+ was allowed to increase beyond 100 micromol/L, and this was associated with dramatic nuclear alterations: chromatin condensation, loss of nuclear lamins, and breakdown of DNA into large 50- to 150-kb fragments. Our studies demonstrate unexpectedly high resistance of cells to calcium cytotoxicity if glycine that is lost during ATP depletion is restored. In addition, they provide insights into novel mechanisms of nuclear disintegration and DNA damage that are triggered when the high thresholds of intracellular Ca2+ required for cell death are exceeded.

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