Journal
AMERICAN JOURNAL OF PHYSICAL MEDICINE & REHABILITATION
Volume 90, Issue 11, Pages 930-939Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/PHM.0b013e31822dea3c
Keywords
Skeletal Muscle; Joint Inflammation; Gene Expression; Rehabilitation
Categories
Funding
- Fundacao de Amparo a Pesquisa do Estado de Sao Paulo (FAPESP) [07/5474-3]
Ask authors/readers for more resources
Ramirez C, Russo TL, Sandoval MC, Dentillo AA, Couto MAS, Durigan JLQ, Salvini TF: Joint inflammation alters gene and protein expression and leads to atrophy in the tibialis anterior muscle in rats. Am J Phys Med Rehabil 2011; 90: 930-939. ''Objective: The aim of this study was to evaluate the effect of tibiotarsal joint inflammation in rat tibialis anterior muscle through muscle fiber cross-sectional area (CSA) and gene expression (atrogin-1, muscle ring finger-1 [MuRF1], myogenic differentiation-1 [MyoD], p38 mitogen-activated protein kinase [p38MAPK], nuclear factor kappa BYdependent [NF kappa B], tumor necrosis factorYalpha [TNF alpha]). Design: Wistar rats were randomly divided into three periods (2, 7, and 15 days) and assigned into four groups within each experimental period: control, sham, inflammation, and immobilization. Real-time polymerase chain reaction, Western blot, immunofluorescence, and muscle fiber CSA analyses were performed. Results: At 2 days, the inflammation group increased atrogin-1, MuRF1, and myostatin and reduced MyoD expression. At 7 days, the inflammation group increased atrogin-1, MuRF1, NF kappa B, p38MAPK, MyoD, myostatin, and TNF-alpha expression and TNF-alpha protein and reduced muscle fiber CSA. At 15 days, gene and protein expression in the inflammation group returned to basal levels, and CSA values were similar to those in control and sham groups. The immobilization groups have a similar pattern in all experimental periods, with increased atrogin-1, MuRF1, NF kappa B, and TNF-alpha gene expression and reduced muscle fiber CSA. The sham group had increased myostatin and atrogin-1 expression at 2 days and increased MyoD and myostatin expression at 7 days. Conclusions: Joint inflammation stimulated the expression of muscle factors related to atrophy, growth, differentiation, and mass regulation followed by muscle atrophy.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available