Satellite cell count, VO 2max, and p38 MAPK in inactive to moderately active young men

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dc.contributor.authorMacaluso F.
dc.contributor.authorBrooks N.E.
dc.contributor.authorvan de Vyver M.
dc.contributor.authorVan Tubbergh K.
dc.contributor.authorNiesler C.U.
dc.contributor.authorMyburgh K.H.
dc.date.accessioned2012-08-13T07:42:43Z
dc.date.available2012-08-13T07:42:43Z
dc.date.issued2012
dc.descriptionArticle
dc.description.abstractSatellite cells (SCs) are responsible for muscle repair following strenuous exercise or injury. SC responses to intervention have been studied, but most studies do not discuss or take into account the substantial variability in SC number among young individuals. We hypothesized that an active lifestyle reflected in higher VO 2max may be associated with greater SC number. As training alters basal p38-mitogen-activated protein kinase (MAPK) activity, which is associated with SC proliferation, SC count may also correlate with this stress signaling kinase. Muscle biopsies from vastus lateralis of eight male participants were analyzed for fiber type, myogenin, and p38/phospho-p38 MAPK using SDS-PAGE and Western blotting. Immunofluorescence was used to detect Pax7 + SCs. Two weeks following the biopsy, subjects underwent an incremental treadmill test to determine VO 2max. A strong positive correlation (P=0.0087) was found between the number of Pax7 + nuclei and VO 2max. Pax7 + cell number correlated negatively with phospho-p38/p38 MAPK (P=0.0006), but had no correlation with fiber type or myogenin. SC number is proportional to VO 2max, and hence it can be postulated that higher levels of physical activity activate SC proliferation but not fusion, underlining the relevance of exercise in stimulating SC pool size even without injury. © 2011 John Wiley & Sons A/S.
dc.identifier.citationScandinavian Journal of Medicine and Science in Sports
dc.identifier.citation22
dc.identifier.citation4
dc.identifier.citatione38
dc.identifier.citatione44
dc.identifier.issn9057188
dc.identifier.otherdoi:10.1111/j.1600-0838.2011.01389.x
dc.identifier.urihttp://hdl.handle.net/10019.1/49188
dc.subjectFiber type
dc.subjectMyogenin
dc.subjectPax7 +
dc.subjectPhysical fitness
dc.subjectVastus lateralis muscle
dc.titleSatellite cell count, VO 2max, and p38 MAPK in inactive to moderately active young men
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