PMID: 668699Jun 15, 1978Paper

Subcellular metabolite concentrations. Dependence of mitochondrial and cytosolic ATP systems on the metabolic state of perfused rat liver

European Journal of Biochemistry
S SobollH W Heldt

Abstract

Mitochondrial and cytosolic contents of adenine nucleotides and phosphate were measured in perfused rat livers employing a technique of fractionation of freeze-fixated tissue in non-aqueous solvents. From the subcellular contents the mitochondrial and cytosolic concentrations of ATP, ADP, AMP and phosphate and the phosphorylation potentials of the subcellular ATP systems were calculated. An attempt was made to elucidate the relationship between mitochondrial and cytosolic adenine nucleotide systems and the dependency on the metabolic state of the liver. The following results were obtained: 1. Under all metabolic conditions studied the mitochondrial ATP/ADP ratios were considerably lower than the cytosolic ratios (mitochondria: 0.1-0.7; cytosol: 2-11). 2. The ATP/ADP ratios calculated from overall tissue contents reflect mainly the cytosolic ratios. 3. An inverse relationship was found between mitochondrial and cytosolic ATP/ADP ratios, i.e. when the mitochondrial ratios tended to increase, the cytosolic ratios decreased and vice versa. 4. The phosphorylation potentials calculated from the subcellular concentrations were higher in the cytosol than in the mitochondria. The potential difference varied between 11 and 3 kj/mol in li...Continue Reading

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