Abstract
The characteristics of mitochondria isolated from perfused livers of rats under hypoxic or oxic conditions were studied. The electron transfer activity was about 60% of normal after hypoxic perfusion for 3 h, but respiratory control was abolished almost completely. These parameters recovered considerably on subsequent oxic perfusion. The adenine nucleotide contents and their net uptake decreased in hypoxia, closely correlated with the energy transduction. Energy-dependent nicotinamide nucleotide transhydrogenase activity and NAD reduction by succinate in submitochondrial particles were most severely inhibited after hypoxic perfusion and were also correlated with adenine nucleotide contents in the particles. These results are discussed in terms of the involvement of adenine nucleotides in energy-transducing systems in mitochondrial membranes.
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