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European Journal of Applied Physiology

, Volume 97, Issue 3, pp 340–346 | Cite as

Skeletal muscle atrophy increases cell proliferation in mice gastrocnemius during the first week of hindlimb suspension

  • Rita FerreiraEmail author
  • Maria João Neuparth
  • António Ascensão
  • José Magalhães
  • Rui Vitorino
  • José Alberto Duarte
  • Francisco Amado
Original Article

Abstract

The comprehension of the cellular mechanisms underlying skeletal muscle atrophy has been the aim of several experimental studies. However, the majority of them focused on alterations of the myocytes induced by different experimental conditions yet disregarding the contribution of other cells such as endothelial cells and fibroblasts. In this sense, 70 Charles River CD1 male mice were randomly assigned to seven groups (n = 10 per group): control and 6, 12, 24, 48, 72 h and 1 week with respect to the period of hindlimb suspension. Forty-eight hours before sacrifice, the animals were injected with bromodeoxyuridine (BrdU) in order to identify proliferating cells. Immunohistochemistry and south-western blotting techniques were used to evaluate across the whole gastrocnemius muscle BrdU incorporation into the different proliferating cells. The contribution of the apoptotic response was also measured in order to ascertain whether the balance between cell survival and death was preserved. The results observed during 1 week of unloading-induced atrophy evidenced an intense peak of proliferating activity only after 6 h, mainly due to the duplication of satellite cells. Consequently to this unexpected activation of satellite cells, the addition of nuclei to the fibre syncytium was recognized at 12 h of unloading. After 48 h of weightlessness, the proliferating activity observed was largely due to an interstitial fibrosis. According to the apoptotic index profile observed during the analysed unloading period, this general proliferative activity was balanced by apoptosis, which strongly suggests the existence of a regulatory feedback response between anabolic and catabolic events in unloading-induced skeletal muscle atrophy.

Keywords

Skeletal muscle atrophy Hindlimb suspension Cell proliferation Apoptosis Satellite cells Fibroblasts Endothelial cells 

Notes

Acknowledgements

The authors want to thank Celeste Resende for her skilled technical assistance. This experimental work was supported by the Programa de Apoio Financeiro à Investigação no Desporto (PAFID) 230/2004.

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Copyright information

© Springer-Verlag 2006

Authors and Affiliations

  • Rita Ferreira
    • 1
    • 2
    Email author
  • Maria João Neuparth
    • 1
    • 3
  • António Ascensão
    • 1
  • José Magalhães
    • 1
  • Rui Vitorino
    • 1
    • 2
  • José Alberto Duarte
    • 1
    • 3
  • Francisco Amado
    • 2
  1. 1.CIAFEL, Laboratory of Sport Biochemistry, Faculty of Sports SciencesUniversity of PortoPortoPortugal
  2. 2.Chemistry DepartmentUniversity of AveiroPortoPortugal
  3. 3.ESSVA Health School, IPSNPortoPortugal

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