Cellular patterns of the atrophic response in murine soleus and gastrocnemius muscles submitted to simulated weightlessness

• Tipo: Artigo em Revista Científica Internacional
• Data: 2007

Autores

ferreira, r (Autor) Outra; vitorino, r (Autor) Outra; neuparth, mj (Autor) Outra; appell, hj (Autor) Outra; amado, f (Autor) Outra; duarte, ja (Autor) FADEUP

Revista

Título: European Journal of Applied Physiology

Vol. 101 Nº 3

Páginas: 331-340

ISSN: 1439-6319

Editora: Springer Nature

Indexação

ISI Web of Knowledge - 12 Citações

Scopus - 13 Citações

Pubmed / Medline

Classificação Científica

FOS: Ciências médicas e da saúde > Medicina básica

Outras Informações

ID Authenticus: P-004-6ZP

DOI: 10.1007/s00421-007-0502-z

Abstract (EN): The purpose of the present study was to investigate the mechanisms of cell death (apoptosis vs. necrosis) during muscle atrophy induced by 1 week of hindlimb suspension. Biochemical and morphological parameters were examined in murine soleus and gastrocnemius muscles. A total of 70 male Charles River CD1 mice were randomly assigned to seven groups (n = 10/group): Cont (loading control conditions) and 6HS, 12HS, 24HS, 48HS, 72HS and 1wkHS with respect to the period of hindlimb suspension (HS). Compared to the Cont, skeletal muscle atrophy was confirmed by a significant decrease of 44 and of 17% in fiber cross-sectional areas in the gastrocnemius and soleus, respectively. A significant increase in caspase-3 activity was noticed in 6HS (196%, P < 0.05) and in 12HS (201%, P < 0.05), as well as the amount of cytosolic mono- and oligonucleosomes at 12HS (142%, P < 0.05) and 24HS (203%, P < 0.05) in the gastrocnemius and soleus, respectively. The profile of necrotic markers showed a peak of myeloperoxidase activity at 24HS (170%, P < 0.05) and at 72HS (114%, P < 0.05) in the gastrocnemius and soleus, respectively. The analysis of N-acetylglucosaminidase activity evidenced more increment in the soleus at 72HS (60%, P < 0.05). The analysis of the basal values of these parameters suggested that apoptosis prevailed in the slow-twitch muscle analyzed, whereas lysosomic activity seemed to be more pronounced in the gastrocnemius. The morphological data supported the biochemical results pointing towards a shift from apoptosis to necrosis, which seems to corroborate the aponecrosis theory.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 10