Increase in the adenine nucleotide translocase content of duckling subsarcolemmal mitochondria during cold acclimation.
Intermyofibrillar and subsarcolemmal mitochondria were isolated from duckling gastrocnemius muscle. The adenine nucleotide translocase (ANT) content of subsarcolemmal mitochondria was found to be half of that present in intermyofibrillar mitochondria. In addition, cold acclimation resulted in a 1.7-fold increase in subsarcolemmal mitochondrial ANT content, with intermyofibrillar mitochondrial ANT remaining constant. This change in mitochondrial ANT content correlates with the previously reported cold-induced change in the sensitivity of mitochondria to palmitate-inhibited ATP synthesis [Roussel et al. (1998) FEBS Lett. 439, 258-262]. It is suggested that the mitochondrial ANT content enhances or reduces the fatty acid uncoupling activity in tissue, depending on the energetic state of mitochondria.
Roussel
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Laboratoire de Physiologie des Régulations Energétiques, Cellulaires et Moléculaires, UMR 5578 CNRS-UCB Lyon 1, Bat. 404, 43 Bd du 11 Novembre 1918, F-69622 Cedex, Villeurbanne, France.
Chainier
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Rouanet
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Barré
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D000222:Adaptation, Physiological; D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D001278:Atractyloside / Q000031:analogs & derivatives* / Q000494:pharmacology; D019069:Cell Respiration / Q000187:drug effects; D003080:Cold Temperature; D004372:Ducks / Q000378:metabolism / Q000502:physiology*; D004791:Enzyme Inhibitors / Q000494:pharmacology; D020128:Inhibitory Concentration 50; D008297:Male; D008931:Mitochondria, Muscle / Q000187:drug effects / Q000201:enzymology* / Q000378:metabolism; D000226:Mitochondrial ADP, ATP Translocases / Q000378:metabolism*; D018482:Muscle, Skeletal / Q000166:cytology / Q000201:enzymology; D010085:Oxidative Phosphorylation / Q000187:drug effects; D019308:Palmitic Acid / Q000378:metabolism / Q000494:pharmacology; D012508:Sarcolemma; D017186:Titrimetry
D004791:Enzyme Inhibitors; D001278:Atractyloside; D019308:Palmitic Acid; D000255:Adenosine Triphosphate; D000226:Mitochondrial ADP, ATP Translocases; C003853:carboxyatractyloside