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Oxidative phosphorylation in intact hepatocytes: Quantitative characterization of the mechanisms of change in efficiency and cellular consequences

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Abstract

Two mechanisms may affect the yield of the oxidative phosphorylation pathway in isolated mitochondria: (i) a decrease in the intrinsic coupling of the proton pumps (H+/2e- or H+/ATP), and (ii) an increase in the inner membrane conductance (proton or cation leak). Hence three kinds of modifications can occur and each of them have been characterized in isolated rat liver mitochondria (see preceding chapter by Rigoulet et al.). In intact isolated hepatocytes, these modifications are linked to specific patterns of bioenergetic parameters, i.e. respiratory flux, mitochondrial redox potential, DY, and phosphate potential.

(1) The increase in H+/ATP stoichiometry of the mitochondrial ATP synthase, as induced by almitrine [20], leads to a decrease in mitochondrial and cytosolic ATP/ADP ratios without any change in the protonmotive force nor in the respiratory rate or redox potential. (2) In comparison to carbohydrate, octanoate metabolism by β-oxidation increases the proportion of electrons supplied at the second coupling site of the respiratory chain. This mimics a redox slipping. Octanoate addition results in an increased respiratory rate and mitochondrial NADH/NAD ratio while protonmotive force and phosphate potential are almost unaffected. The respiratory rate increase is associated with a decrease in the overall apparent thermodynamic driving force (2Δ'o - nΔp) which confirms the ‘redox-slipping-like’ effect. (3) An increase in proton conductance as induced by the protonophoric uncoupler 2,4-dinitrophenol (DNP) leads to a decrease, as expected, in the mitochondrial NADH/NAD and ATP/ADP ratios and in ΔΨ while respiratory rate is increased.

Thus, each kind of modification (proton leak, respiratory chain redox slipping or increase in H+/ATP stoichiometry of ATPase) is related to a specific set of bioenergetic parameters in intact cells. Moreover, these patterns are in good agreement with the data found in isolated mitochondria.

From this work, we conclude that quantitative analysis of four bioenergetic parameters (respiration rate, mitochondrial NADH/NAD ratio, protonmotive force and mitochondrial phosphate potential) gives adequate tools to investigate the mechanism by which some alterations may affect the yield of the oxidative phosphorylation pathway in intact cells.

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Authors and Affiliations

  1. Laboratoire de Bioénergétique Fondamentale et Appliquée, Université Joseph Fourier, Grenoble, France

    Xavier Leverve, Brigitte Sibille & Marie-Astrid Piquet

  2. Institut de Biochimie et de Génétique Cellulaires du CNRS, Université Bordeaux II, Bordeaux, France

    Anne Devin, Pascal Espié & Michel Rigoulet

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  1. Xavier Leverve
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  2. Brigitte Sibille
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  5. Pascal Espié
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  6. Michel Rigoulet
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Leverve, X., Sibille, B., Devin, A. et al. Oxidative phosphorylation in intact hepatocytes: Quantitative characterization of the mechanisms of change in efficiency and cellular consequences. Mol Cell Biochem 184, 53–65 (1998). https://doi.org/10.1023/A:1006810209531

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