Jeneson 2011 Am J Physiol Regul Integr Comp Physiol

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Publications in the MiPMap
Jeneson JA, ter Veld F, Schmitz JP, Meyer RA, Hilbers PA, Nicolay K (2011) Similar mitochondrial activation kinetics in wild-type and creatine kinase-deficient fast-twitch muscle indicate significant Pi control of respiration. Am J Physiol Regul Integr Comp Physiol 300:R1316-25.

Β» PMID: 21451138 Open Access

Jeneson Jeroen AL, ter Veld F, Schmitz JP, Meyer RA, Hilbers PA, Nicolay K (2011) Am J Physiol Regul Integr Comp Physiol

Abstract: Past simulations of oxidative ATP metabolism in skeletal muscle have predicted that elimination of the creatine kinase (CK) reaction should result in dramatically faster oxygen consumption dynamics during transitions in ATP turnover rate. This hypothesis was investigated. Oxygen consumption of fast-twitch (FT) muscle isolated from wild-type (WT) and transgenic mice deficient in the myoplasmic (M) and mitochondrial (Mi) CK isoforms (MiM CK(-/-)) were measured at 20Β°C at rest and during electrical stimulation. MiM CK(-/-) muscle oxygen consumption activation kinetics during a step change in contraction rate were 30% faster than WT (time constant 53 Β± 3 vs. 69 Β± 4 s, respectively; mean Β± SE, n = 8 and 6, respectively). MiM CK(-/-) muscle oxygen consumption deactivation kinetics were 380% faster than WT (time constant 74 Β± 4 s vs. 264 Β± 4 s, respectively). Next, the experiments were simulated using a computational model of the oxidative ATP metabolic network in FT muscle featuring ADP and Pi feedback control of mitochondrial respiration (J. A. L. Jeneson, J. P. Schmitz, N. A. van den Broek, N. A. van Riel, P. A. Hilbers, K. Nicolay, J. J. Prompers. Am J Physiol Endocrinol Metab 297: E774-E784, 2009) that was reparameterized for 20Β°C. Elimination of Pi control via clamping of the mitochondrial Pi concentration at 10 mM reproduced past simulation results of dramatically faster kinetics in CK(-/-) muscle, while inclusion of Pi control qualitatively explained the experimental observations. On this basis, it was concluded that previous studies of the CK-deficient FT muscle phenotype underestimated the contribution of Pi to mitochondrial respiratory control. β€’ Keywords: Skeletal muscle, Mitochondria, Metabolic control, Computational modeling β€’ Bioblast editor: Gnaiger E β€’ O2k-Network Lab: NL Eindhoven Nicolay K

Labels: MiParea: Respiration, Genetic knockout;overexpression, Exercise physiology;nutrition;life style 

Organism: Mouse  Tissue;cell: Skeletal muscle  Preparation: Intact organ 

HRR: Oxygraph-2k 

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