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. 1966 Nov;101(2):480–487. doi: 10.1042/bj1010480

The effect of calcium ions on the glycolytic activity of Ehrlich ascites-tumour cells

F L Bygrave 1,*
PMCID: PMC1270131  PMID: 6007855

Abstract

1. Added Ca2+ inhibited lactate formation from sugar phosphates by intact Ehrlich ascites-tumour cells. Lactate formation from glucose by these cells was unaffected by added Ca2+. 2. The Ca2+ inhibition of lactate formation by intact cells occurred in the extracellular medium. 3. Intact ascites-tumour cells did not take up Ca2+ in vitro. 4. Glycolysis of sugar phosphates by cell extracts as well as pyruvate formation from 3-phosphoglycerate and phosphoenolpyruvate was inhibited by Ca2+. 5. It was concluded that Ca2+ inhibited the pyruvate-kinase (EC 2.7.1.40) reaction. Further, Ca2+ inhibition of pyruvate kinase could be correlated with the overall inhibition of glycolysis. 6. Concentrations of Ca2+ usually present in Krebs–Ringer buffers, inhibited glycolysis and pyruvate-kinase activity by approx. 50%. 7. The inhibition of glycolysis by added Ca2+ could be partially reversed by K+ and completely reversed by Mg2+ or by stoicheiometric amounts of EDTA. 8. The hypothesis is advanced that the inability of tumour cells to take up Ca2+ is a factor contributing towards their high rate of glycolysis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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