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Difference between revisions of "Votion 2012 PLoS One"

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{{Publication
{{Publication
|title=Votion DM, Gnaiger E, Lemieux H, Mouithys-Mickalad A, Serteyn D (2012) Physical fitness and mitochondrial respiratory capacity in horse skeletal muscle. PLoS One 7: e34890.
|title=Votion DM, Gnaiger E, Lemieux H, Mouithys-Mickalad A, Serteyn D (2012) Physical fitness and mitochondrial respiratory capacity in horse skeletal muscle. PLoS One 7:e34890.
|info=[http://www.ncbi.nlm.nih.gov/pubmed/22529950 PMID: 22529950 Open Access]
|info=[http://www.ncbi.nlm.nih.gov/pubmed/22529950 PMID: 22529950 Open Access]
|authors=Votion DM, Gnaiger E, Lemieux H, Mouithys-Mickalad A, Serteyn D
|authors=Votion DM, Gnaiger Erich, Lemieux H, Mouithys-Mickalad A, Serteyn D
|year=2012
|year=2012
|journal=PLoS One
|journal=PLoS One
|abstract=''Background'': Within the animal kingdom, horses are among the most powerful aerobic athletic mammals.  Determination of muscle respiratory capacity and control improves our knowledge of mitochondrial physiology in horses and high aerobic performance in general.
|abstract=''Background'': Within the animal kingdom, horses are among the most powerful aerobic athletic mammals.  Determination of muscle respiratory capacity and control improves our knowledge of mitochondrial physiology in horses and high aerobic performance in general.


''Methodology/Principal Findings'': We applied high-resolution respirometry and multiple [[substrate-uncoupler-inhibitor titration]] protocols to study mitochondrial physiology in small (1.0 – 2.5 mg) permeabilized muscle fibres sampled from triceps brachii of healthy horses.  
We applied high-resolution respirometry and multiple [[substrate-uncoupler-inhibitor titration]] protocols to study mitochondrial physiology in small (1.0 – 2.5 mg) permeabilized muscle fibres sampled from triceps brachii of healthy horses. Oxidative phosphorylation ([[OXPHOS]]) capacity [pmol O<sub>2</sub>∙s<sup>-1</sup>∙mg<sup>-1</sup> wet weight] in the NADH&succinate-pathway (NS, combined [[CI<small>&</small>II]]-linked substrate supply: glutamate&malate&succinate) increased from 77±18 in overweight horses to 103±18, 122±15, and 129±12 in untrained, trained andcompetitive horses (''N'' = 3, 8, 16, and 5, respectively). Similar to human muscle mitochondria, equine OXPHOS capacity was limited by the phosphorylation system to 0.85±0.10 (''N'' = 32) of electron transfer capacity, independent of fitness level. In 15 trained horses, OXPHOS capacity increased from 119±12 to 134±37 when pyruvate was included in the NS-substrate cocktail. Relative to this maximum OXPHOS capacity, NADH-linked OXPHOS capacities (N) were only 50 % with glutamate&malate, 64 % with pyruvate&malate, and 68 % with pyruvate&glutamate&malate, and ~78 % with succinate&rotenone (S). OXPHOS capacity with glutamate&malate increased with fitness relative to NS-supported ET capacity from a flux control ratio of 0.38 to 0.40, 0.41 and 0.46 in overweight to competitive horses, whereas the S/NS substrate control ratio remained constant at 0.70.  Therefore, the apparent deficit of the N- over S-pathway capacity was reduced with physical fitness.   
Oxidative phosphorylation ([[OXPHOS]]) capacity [pmol O2∙s<sup>-1</sup>∙mg<sup>-1</sup> wet weight] with combined Complex I and II ([[CI+II]]) substrate supply (malate+glutamate+succinate) increased from 77±18 in overweight horses to 103±18, 122±15, and 129±12 in untrained, trained andcompetitive horses (''N'' = 3, 8, 16, and 5, respectively).   Similar to human muscle mitochondria, equine OXPHOS capacity was limited by the phosphorylation system to 0.85±0.10 (''N'' = 32) of electron transfer capacity, independent of fitness level. In 15 trained horses, OXPHOS capacity increased from 119±12 to 134±37 when pyruvate was included in the CI+II substrate cocktail. Relative to this maximum OXPHOS capacity, Complex I (CI)-linked OXPHOS capacities were only 50% with glutamate+malate, 64% with pyruvate+malate, and 68% with pyruvate+malate+glutamate, and ~78% with CII-linked succinate+rotenone. OXPHOS capacity with glutamate+malate increased with fitness relative to CI+II-supported ETS capacity from a flux control ratio of 0.38 to 0.40, 0.41 and 0.46 in overweight to competitive horses, whereas the CII/CI+II substrate control ratio remained constant at 0.70.  Therefore, the apparent deficit of the CI- over CII-linked pathway capacity was reduced with physical fitness.   


''Conclusions/Significance'': The scope of mitochondrial density-dependent OXPHOS capacity and the density-independent (qualitative) increase of CI-linked respiratory capacity with increased fitness open up new perspectives of integrative and comparative mitochondrial respiratory physiology.
The scope of mitochondrial density-dependent OXPHOS capacity and the density-independent (qualitative) increase of N-respiratory capacity with increased fitness open up new perspectives of integrative and comparative mitochondrial respiratory physiology.
|keywords=horse, skeletal muscle, microbiopsy, permeabilized fibres, mitochondria, OXPHOS capacity, high-resolution respirometry
|keywords=horse, skeletal muscle, microbiopsy, permeabilized fibres, mitochondria, OXPHOS capacity, high-resolution respirometry
|mipnetlab=BE Liege Votion DM, AT Innsbruck Gnaiger E, AT Innsbruck MitoCom
|mipnetlab=BE Liege Votion DM, AT Innsbruck Gnaiger E, CA Edmonton Lemieux H
}}
}}
:::: * Contribution to [[K-Regio_MitoCom_Tyrol|K-Regio project ''MitoCom Tyrol'']], funded by the Tyrolian Government and the European Regional Development Fund.
== SUIT protocols ==
::::* [[SUIT-008]]
::::* [[SUIT-011]]
**** 2017-01-29 Abstract edited with updated terminology: » [[MitoPedia: SUIT]]
== O2k-Publications ==
::::* [[O2k-Publications: Exercise physiology;nutrition;life style]]
::::* [[O2k-Publications: Comparative MiP;environmental MiP]]
== Cited by ==
::* 22 articles in PubMed (2021-12-27) https://pubmed.ncbi.nlm.nih.gov/22529950/
{{Template:Cited by Gnaiger 2020 BEC MitoPathways}}
{{Labeling
{{Labeling
|instruments=Oxygraph-2k
|area=Respiration, mt-Biogenesis;mt-density, Comparative MiP;environmental MiP, Exercise physiology;nutrition;life style
|diseases=Obesity
|injuries=Ischemia-reperfusion
|organism=Horse
|organism=Horse
|tissues=Skeletal muscle
|tissues=Skeletal muscle
|preparations=Permeabilized tissue
|preparations=Permeabilized tissue
|couplingstates=LEAK, OXPHOS, ETS
|couplingstates=LEAK, OXPHOS, ET
|substratestates=CI, CII, CI+II
|pathways=N, S, NS
|topics=Mitochondrial Biogenesis; Mitochondrial Density
|instruments=Oxygraph-2k
|additional=SUIT-011, SUIT-008, SUIT-006, SUIT-008 O2 pfi D014, SUIT-011 O2 pfi D024, BEC 2020.2
}}
}}
* Contribution to [[K-Regio_MitoCom_Tyrol|K-Regio project ''MitoCom Tyrol'']], funded by the Tyrolian Government and the European Regional Development Fund.

Latest revision as of 03:37, 19 July 2022

Publications in the MiPMap
Votion DM, Gnaiger E, Lemieux H, Mouithys-Mickalad A, Serteyn D (2012) Physical fitness and mitochondrial respiratory capacity in horse skeletal muscle. PLoS One 7:e34890.

» PMID: 22529950 Open Access

Votion DM, Gnaiger Erich, Lemieux H, Mouithys-Mickalad A, Serteyn D (2012) PLoS One

Abstract: Background: Within the animal kingdom, horses are among the most powerful aerobic athletic mammals. Determination of muscle respiratory capacity and control improves our knowledge of mitochondrial physiology in horses and high aerobic performance in general.

We applied high-resolution respirometry and multiple substrate-uncoupler-inhibitor titration protocols to study mitochondrial physiology in small (1.0 – 2.5 mg) permeabilized muscle fibres sampled from triceps brachii of healthy horses. Oxidative phosphorylation (OXPHOS) capacity [pmol O2∙s-1∙mg-1 wet weight] in the NADH&succinate-pathway (NS, combined [[CI&II]]-linked substrate supply: glutamate&malate&succinate) increased from 77±18 in overweight horses to 103±18, 122±15, and 129±12 in untrained, trained andcompetitive horses (N = 3, 8, 16, and 5, respectively). Similar to human muscle mitochondria, equine OXPHOS capacity was limited by the phosphorylation system to 0.85±0.10 (N = 32) of electron transfer capacity, independent of fitness level. In 15 trained horses, OXPHOS capacity increased from 119±12 to 134±37 when pyruvate was included in the NS-substrate cocktail. Relative to this maximum OXPHOS capacity, NADH-linked OXPHOS capacities (N) were only 50 % with glutamate&malate, 64 % with pyruvate&malate, and 68 % with pyruvate&glutamate&malate, and ~78 % with succinate&rotenone (S). OXPHOS capacity with glutamate&malate increased with fitness relative to NS-supported ET capacity from a flux control ratio of 0.38 to 0.40, 0.41 and 0.46 in overweight to competitive horses, whereas the S/NS substrate control ratio remained constant at 0.70. Therefore, the apparent deficit of the N- over S-pathway capacity was reduced with physical fitness.

The scope of mitochondrial density-dependent OXPHOS capacity and the density-independent (qualitative) increase of N-respiratory capacity with increased fitness open up new perspectives of integrative and comparative mitochondrial respiratory physiology. Keywords: horse, skeletal muscle, microbiopsy, permeabilized fibres, mitochondria, OXPHOS capacity, high-resolution respirometry

O2k-Network Lab: BE Liege Votion DM, AT Innsbruck Gnaiger E, CA Edmonton Lemieux H

* Contribution to K-Regio project MitoCom Tyrol, funded by the Tyrolian Government and the European Regional Development Fund.

SUIT protocols

O2k-Publications

Cited by

Gnaiger 2020 BEC MitoPathways
Gnaiger E (2020) Mitochondrial pathways and respiratory control. An introduction to OXPHOS analysis. 5th ed. Bioenerg Commun 2020.2. https://doi.org/10.26124/bec:2020-0002



Labels: MiParea: Respiration, mt-Biogenesis;mt-density, Comparative MiP;environmental MiP, Exercise physiology;nutrition;life style  Pathology: Obesity  Stress:Ischemia-reperfusion  Organism: Horse  Tissue;cell: Skeletal muscle  Preparation: Permeabilized tissue 


Coupling state: LEAK, OXPHOS, ET  Pathway: N, S, NS  HRR: Oxygraph-2k 

SUIT-011, SUIT-008, SUIT-006, SUIT-008 O2 pfi D014, SUIT-011 O2 pfi D024, BEC 2020.2