Cited by 83Mitochondrial Function and PathologyAdipose Tissue and MetabolismCardiovascular and exercise physiology

Mitochondrial tissue specificity of substrates utilization in rat cardiac and skeletal muscles

Ponsot, E., Zoll, J., N'Guessan, B., Ribera, F., Lampert, E., Richard, R., Veksler, V., Ventura‐Clapier, R. +1 more·2005·Journal of Cellular Physiology

Abstract

As energetic metabolism is crucial for muscles, they develop different adaptations to respond to fluctuating demand among muscle types. Whereas quantitative characteristics are known, no study described simultaneously quantitative and qualitative differences among muscle types in terms of substrates utilization patterns. This study thus defined the pattern of substrates preferential utilization by mitochondria from glycolytic gastrocnemius (GAS) and oxidative soleus (SOL) skeletal muscles and from heart left ventrical (LV) in rats. We measured in situ, ADP (2 mM)-stimulated, mitochondrial respiration rates from skinned fibers in presence of increasing concentrations of pyruvate (Pyr) + malate (Mal), palmitoyl-carnitine (Palm-C) + Mal, glutamate (Glut) + Mal, glycerol-3-phosphate (G3-P), lactate (Lact) + Mal. Because the fibers oxygen uptake (Vs) followed Michaelis-Menten kinetics in function of substrates level we determined the Vs and Km, representing maximal oxidative capacity and the mitochondrial sensibility for each substrate, respectively. Vs were in the order GAS < SOL < LV for Pyr, Glu, and Palm-C substrates, whereas in the order SOL = LV < GAS with G3-P. Moreover, the relative capacity to oxidize Palm-C is extremely higher in LV than in SOL. Vs was not stimulated by the Lact substrate. The Km was equal for Pyr among muscles, but much lower for G3-P in GAS and lower for Palm-C in LV. These results demonstrate qualitative mitochondrial tissue specificity for metabolic pathways. Mitochondria of glycolytic muscle fibers are well adapted to play a central role for maintaining a satisfactory cytosolic redox state in these fibers, whereas mitochondria of LV developed important capacities to use fatty acids.

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Crossref · 10.1002/jcp.20245

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  • In rats, type II muscle fibers are more sensitive than type I fibers.

    “Second, differences between type I and type II muscle fibers have been reported previously in rats, with type II fibers being more sensitive than type I (41).”

    From Simvastatin Effects on Skeletal Muscle (2013) · cites this paper as [41]

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Authors
Ponsot, E., Zoll, J., N'Guessan, B., Ribera, F., Lampert, E., Richard, R., Veksler, V., Ventura‐Clapier, R., & Mettauer, B.
Affiliations
  • Inserm (FR)
  • Hopitaux Civils de Colmar (FR)
Corresponding author
Ponsot, E.
Venue
Journal of Cellular Physiology
Publisher
Wiley
Published
2004-11
Volume
203
Issue
3
Pages
479-486
ISSN
  • 0021-9541 (ISSN-L)
  • 1097-4652
OpenAlex
W2044523475
Cited by
83
References
37
Citations by year
2026: 1 · 2024: 1 · 2023: 5 · 2022: 2 · 2021: 3 · 2020: 3 · 2019: 2 · 2018: 5 · 2017: 4 · 2016: 5 · 2015: 3 · 2014: 7 · 2013: 5 · 2012: 8
FWCI
1.54
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Cellular Physiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
Institut National de la Santé et de la Recherche Médicale
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Mitochondrial Function and Pathology
  • Health Sciences › Medicine › Physiology › Adipose Tissue and Metabolism
  • Health Sciences › Medicine › Complementary and alternative medicine › Cardiovascular and exercise physiology
Keywords
tissue specificity, myocardium, skeletal muscle, gastrocnemius, soleus muscle, left ventricle, mitochondrial respiration, pyruvate oxidation, fatty acid oxidation, palmitoylcarnitine, glycerol-3-phosphate, glutamate oxidation, lactate oxidation, Michaelis constant, oxygen consumption, redox state, muscle fiber type
MeSH terms
Adenosine Diphosphate, Animals, Carnitine, Energy Metabolism, Fatty Acids, Glycerophosphates, Glycolysis, Kinetics, Malates, Male, Mitochondria, Myocardium, Oxidation-Reduction, Oxidative Phosphorylation, Rats, Wistar, Muscle, Skeletal, Glutamic Acid, Cell Respiration, Pyruvic Acid, Lactic Acid, Rats

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