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Ambient hypoxia enhances the loss of muscle mass after extensive injury
Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Antenne de la Tronche, La Tronche, France; Center for Muscle Biology, Department of Physiology, University of Kentucky, Lexington KY, United States.ORCID-id: 0000-0002-5322-4150
Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Antenne de la Tronche, La Tronche, France; Ecole du Val-de-Grâce, Paris, France.
Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Antenne de la Tronche, La Tronche, France.
Pôle Génomique, Institut de Recherche Biomédicale des Armées, La Tronche, France.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Pflügers Archiv: European Journal of Physiology, ISSN 0031-6768, E-ISSN 1432-2013, Vol. 466, nr 3, s. 587-598Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Hypoxia induces a loss of skeletal muscle mass and alters myogenesis in vitro, but whether it affects muscle regeneration in vivo following injury remains to be elucidated. We hypothesized that hypoxia would impair the recovery of muscle mass during regeneration. To test this hypothesis, the soleus muscle of female rats was injured by notexin and allowed to recover for 3, 7, 14, and 28 days under normoxia or hypobaric hypoxia (5,500 m) conditions. Hypoxia impaired the formation and growth of new myofibers and enhanced the loss of muscle mass during the first 7 days of regeneration, but did not affect the final recovery of muscle mass at 28 days. The impaired regeneration under hypoxic conditions was associated with a blunted activation of mechanical target of rapamycin (mTOR) signaling as assessed by p70(S6K) and 4E-BP1 phosphorylation that was independent of Akt activation. The decrease in mTOR activity with hypoxia was consistent with the increase in AMP-activated protein kinase activity, but not related to the change in regulated in development and DNA response 1 protein content. Hypoxia increased the mRNA levels of the atrogene muscle ring finger-1 after 7 days of regeneration, though muscle atrophy F box transcript levels remained unchanged. The increase in MyoD and myogenin mRNA expression with regeneration was attenuated at 7 days with hypoxia. In conclusion, our results support the notion that the enhanced loss of muscle mass observed after 1 week of regeneration under hypoxic conditions could mainly result from the impaired formation and growth of new fibers resulting from a reduction in protein synthesis and satellite cell activity.

sted, utgiver, år, opplag, sider
Springer, 2014. Vol. 466, nr 3, s. 587-598
Emneord [en]
Muscle regeneration, Akt/mTOR pathway, AMPK, Satellite cells, MRF
HSV kategori
Identifikatorer
URN: urn:nbn:se:oru:diva-66014DOI: 10.1007/s00424-013-1336-7ISI: 000331719400021PubMedID: 23974966Scopus ID: 2-s2.0-84896721442OAI: oai:DiVA.org:oru-66014DiVA, id: diva2:1192499
Merknad

Funding Agencies:

Ministere de I'Enseignement Superieur et de la Recherche 

Association Francaise contre les Myopathies, 13955

Tilgjengelig fra: 2018-03-22 Laget: 2018-03-22 Sist oppdatert: 2018-06-26bibliografisk kontrollert

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