UCP3 protein expression is lower in type I, IIa and IIx muscle fiber types of endurance-trained compared to untrained subjects

Russell, A.P., Wadley, G., Hesselink, M. K. C., Schaart, G., Lo, S., Léger, B., Garnham, A., Kornips, E., Cameron-Smith, D., Giacobino, J.-P., Muzzin, P., Snow, R. and Schrauwen, P. 2003, UCP3 protein expression is lower in type I, IIa and IIx muscle fiber types of endurance-trained compared to untrained subjects, Pfluegers Archiv : European journal of physiology, vol. 445, no. 5, pp. 563-569.


Title UCP3 protein expression is lower in type I, IIa and IIx muscle fiber types of endurance-trained compared to untrained subjects
Author(s) Russell, A.P.
Wadley, G.
Hesselink, M. K. C.
Schaart, G.
Lo, S.
Léger, B.
Garnham, A.
Kornips, E.
Cameron-Smith, D.
Giacobino, J.-P.
Muzzin, P.
Snow, R.
Schrauwen, P.
Journal name Pfluegers Archiv : European journal of physiology
Volume number 445
Issue number 5
Start page 563
End page 569
Publisher Springer-Verlag
Place of publication Berlin, Germany
Publication date 2003-02
ISSN 0031-6768
1432-2013
Keyword(s) exercise
oxidative phosphorylation
skeletal muscle
Summary Uncoupling protein 3 (UCP3) is a muscle mitochondrial protein believed to uncouple the respiratory chain, producing heat and reducing aerobic ATP production. Our aim was to quantify and compare the UCP3 protein levels in type I, IIa and IIx skeletal muscle fibers of endurance-trained (Tr) and healthy untrained (UTr) individuals. UCP3 protein content was quantified using Western blot and immunofluorescence. Skeletal muscle fiber type was determined by both an enzymatic ATPase stain and immunofluorescence. UCP3 protein expression measured in skeletal muscle biopsies was 46% lower ( P=0.01) in the Tr compared to the UTr group. UCP3 protein expression in the different muscle fibers was expressed as follows; IIx>IIa>I in the fibers for both groups ( P<0.0167) but was lower in all fiber types of the Tr when compared to the UTr subjects ( P<0.001). Our results show that training status did not change the skeletal muscle fiber hierarchical UCP3 protein expression in the different fiber types. However, it affected UCP3 content more in type I and type IIa than in the type IIx muscle fibers. We suggest that this decrease may be in relation to the relative improvement in the antioxidant defense systems of the skeletal muscle fibers and that it might, as a consequence, participate in the training induced improvement in mechanical efficiency.
Language eng
Field of Research 111601 Cell Physiology
Socio Economic Objective 970111 Expanding Knowledge in the Medical and Health Sciences
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2003, Kluwer Academic
Persistent URL http://hdl.handle.net/10536/DRO/DU:30008604

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