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. 1994 Feb 15;298(Pt 1):99–105. doi: 10.1042/bj2980099

Inhibition of cancer growth and selective glutathione depletion in Ehrlich tumour cells in vivo by extracellular ATP.

M C Lasso de la Vega 1, P Terradez 1, E Obrador 1, J Navarro 1, J A Pellicer 1, J M Estrela 1
PMCID: PMC1137988  PMID: 8129737

Abstract

We have investigated the effect of extracellular ATP on tumour-cell proliferation and GSH levels in Ehrlich-ascites-tumour-bearing mice. After daily administration of exogenous ATP (1 mmol/kg) during 7 days, we found a 56% inhibition of tumour growth, precisely when controls show the highest rates of cell proliferation and the highest levels of GSH. This effect is accompanied by a decrease in GSH content in the tumour, but not in normal tissues. The decrease in GSH concentration within the cancer cells is associated with a decrease in gamma-glutamylcysteine synthetase activity and in protein synthesis. Growth inhibition is mediated by generation of extracellular adenosine, which subsequently increases intracellular levels of ATP and decreases intracellular levels of UTP in the cancer cells. Our results suggest that inhibition of tumour growth by ATP is due to an adenosine-dependent pyrimidine starvation effect.

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Selected References

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