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. 1980 Jun 15;188(3):817–822. doi: 10.1042/bj1880817

Deterioration of rat liver mitochondria under conditions of metabolite deprivation.

J W Parce, P I Spach, C C Cunningham
PMCID: PMC1161966  PMID: 6258562

Abstract

In a previous study [Parce, Cunningham & Waite (1978) Biochemistry 17, 1634-1639] changes in mitochondrial phospholipid metabolism and energy-linked functions were monitored as coupled mitochondria were aged in iso-osmotic sucrose solution at 18 degrees C. The sequence of events that occur in mitochondrial deterioration under the above conditions have been established more completely. Total adenine nucleotides are depleted early in the aging process, and their loss parallels the decline in respiratory control. Related to the loss of total adenine nucleotides is a dramatic decrease in ADP and ATP translocation (uptake). The decline of respiratory control is due primarily to a decrease in State-3 respiration; loss of this respiratory activity can be related to the decline in ADP translocation. Mitochondrial ATPase activity does not increase significantly until State-4 respiration has increased appreciably. At the time of loss of respiratory control the ATPase activity increases to equal the uncoupler-stimulated activity. The H+/O ratio and P/O ratios do not decrease appreciably until respiratory control is lost. Similarly, permeability of the membrane to the passive diffusion of protons increases only after respiratory control is lost. There observations reinforce our earlier conclusion that there are two main phases in mitochondrial aging. The first phase is characterized by loss of the ability to translocate adenine nucleotides. The second phase is characterized by a decline in the ability of the mitochondrion to conserve energy (i.e. maintain a respiration-driven proton gradient) and to synthesize ATP.

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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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