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Erschienen in: European Journal of Applied Physiology 7/2017

10.05.2017 | Original Article

Age and sex differences in human skeletal muscle fibrosis markers and transforming growth factor-β signaling

verfasst von: Lewan Parker, Marissa K. Caldow, Rani Watts, Pazit Levinger, David Cameron-Smith, Itamar Levinger

Erschienen in: European Journal of Applied Physiology | Ausgabe 7/2017

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Abstract

Purpose

The aim of the study was to determine whether higher fibrosis markers in skeletal muscle of older adults are accompanied by increased expression of components of the canonical TGF-β signal transduction pathway.

Methods

Fourteen healthy young (21–35 years; 9 males and 5 females) and seventeen older (55–75 years; 9 males and 8 females) participants underwent vastus lateralis biopsies to determine intramuscular mRNA and protein expression of fibrogenic markers and TGF-β signaling molecules related to TGF-β1 and myostatin.

Results

Expression of mRNA encoding the pro-fibrotic factors; axin 2, collagen III, β-catenin and fibronectin, were all significantly higher (all p < 0.05) in the older participants (350, 170, 298, and 641%, respectively). Furthermore, axin 2 and β-catenin mRNA were significantly higher in older females than older males (p < 0.05). Gene expression of ActRIIB, myostatin, and TGF-β1 were higher in older adults compared to younger adults (all p < 0.05). There was, however, no difference in the total protein content of myostatin, myoD or myogenin (all p > 0.05), whereas Smad3 protein phosphorylation was 48% lower (p < 0.05) in muscle from older adults.

Conclusions

Increased abundance of mRNA of fibrotic markers was observed in muscle from older adults and was partly accompanied by altered abundance of pro-fibrotic ligands in a sex specific manner.
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Metadaten
Titel
Age and sex differences in human skeletal muscle fibrosis markers and transforming growth factor-β signaling
verfasst von
Lewan Parker
Marissa K. Caldow
Rani Watts
Pazit Levinger
David Cameron-Smith
Itamar Levinger
Publikationsdatum
10.05.2017
Verlag
Springer Berlin Heidelberg
Erschienen in
European Journal of Applied Physiology / Ausgabe 7/2017
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI
https://doi.org/10.1007/s00421-017-3639-4

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