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Scheibye-Knudsen 2009 Eur J Appl Physiol

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Scheibye-Knudsen M, Quistorff B (2009) Regulation of mitochondrial respiration by inorganic phosphate: comparing permeabilized muscle fibers and isolated mitochondria prepared from type-1 and type-2 rat skeletal muscle. Eur J Appl Physiol 105:279-87.

» PMID: 18989695

Scheibye-Knudsen M, Quistorff B (2009) Eur J Appl Physiol

Abstract: ADP is generally accepted as a key regulator of oxygen consumption both in isolated mitochondria and in permeabilized fibers from skeletal muscle. The present study explored inorganic phosphate in a similar regulatory role. Saponin permeabilized fibers and isolated mitochondria from type-I and type-II muscle from male Wistar rats were prepared. Respiration was measured while the medium Pi concentration was gradually increased. The apparent Km values for Pi were 607 ± 17 µM and 405 ± 15 μM (P < 0.0001) for type-I and type-II fibers, respectively. For isolated mitochondria the values were significantly lower than type-1 permeabilized fibers, 338 ± 130 μM and 235 ± 30 μM (P < 0.05), but not different with respect to fiber type. The reason for this difference in Km values in the permeabilized muscle is unknown, but a similar pattern has been observed for K m of ADP. Our data indicate that phosphate may play a role in regulation of oxygen consumption in vitro and in vivo. Keywords: Mitochondrial respiration, Permeabilized muscle, Inorganic phosphate, Striated muscle, Oxygen consumption, Oxidative phosphorylation

O2k-Network Lab: DK Copenhagen Quistorff B


Organism: Rat  Tissue;cell: Skeletal muscle  Preparation: Permeabilized tissue, Isolated mitochondria 

Regulation: Phosphate  Coupling state: OXPHOS 

HRR: Oxygraph-2k