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Proton-cation translocation in tumor cell mitochondria.

Abstract
The capacity of mitochondria isolated from tumor cells to conserve the transmembrane electrochemical proton gradient set up by respiration has been studied. In a K+ medium, mitochondria from Ehrlich ascites tumor cells exhibit a capacity to conserve aerobic delta microH comparable to that displayed by normal rat liver mitochondria. Mitochondria from Morris hepatoma 3924A show a decreased capacity to store delta microH+, which is principally due to lowering of delta pH. In a Na+ medium, both species of tumor mitochondria show a significant decrease of aerobic delta pH, while delta psi is the same, with respect to rat liver mitochondria. Experiments on passive swelling show that mitochondria from ascites tumor cells have an enhanced permeability to chloride salts of monovalent cations and increased activity of the Na+ (K+)-H+ exchange system of the mitochondrial membrane with respect to normal mitochondria. The enhanced activity of this system in ascites cells is also shown by the characteristics of respiration-linked proton translocation in submitochondrial particles and subsequent anaerobic proton diffusion. It is concluded that the decreased capacity of mitochondria from tumor cells to conserve aerobic delta pH is due to enhanced cyclic flow of Na+ across the membrane.
AuthorsS Papa, F Capuano, N Capitanio, M Lorusso, T Galeotti
JournalCancer research (Cancer Res) Vol. 43 Issue 2 Pg. 834-8 (Feb 1983) ISSN: 0008-5472 [Print] United States
PMID6848196 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
Chemical References
  • Sodium
  • Magnesium
  • Potassium
Topics
  • Aerobiosis
  • Animals
  • Carcinoma, Ehrlich Tumor (metabolism)
  • Hydrogen-Ion Concentration
  • Liver Neoplasms, Experimental (metabolism)
  • Magnesium (pharmacology)
  • Membrane Potentials
  • Mice
  • Mitochondria (metabolism)
  • Mitochondria, Liver (metabolism)
  • Mitochondrial Swelling (drug effects)
  • Oxygen Consumption
  • Potassium (pharmacology)
  • Rats
  • Sodium (pharmacology)
  • Submitochondrial Particles (metabolism)

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