Abstract | BACKGROUND: In addition to the primary symptoms arising from inflamed joints, muscle weakness is prominent and frequent in patients with rheumatoid arthritis (RA). Here, we investigated the mechanisms of arthritis-induced muscle dysfunction in rats with adjuvant-induced arthritis (AIA). METHODS: AIA was induced in the knees of rats by injection of complete Freund's adjuvant and was allowed to develop for 21 days. Muscle contractile function was assessed in isolated extensor digitorum longus (EDL) muscles. To assess mechanisms underlying contractile dysfunction, we measured redox modifications, redox enzymes and inflammatory mediators, and activity of actomyosin ATPase and sarcoplasmic reticulum (SR) Ca(2+)- ATPase. RESULTS: CONCLUSIONS:
Antioxidant treatment prevented the development of oxidant-induced actin aggregates and contractile dysfunction in the skeletal muscle of AIA rats. This implies that antioxidant treatment can be used to effectively counteract muscle weakness in inflammatory conditions.
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Authors | Takashi Yamada, Masami Abe, Jaesik Lee, Daisuke Tatebayashi, Koichi Himori, Keita Kanzaki, Masanobu Wada, Joseph D Bruton, Håkan Westerblad, Johanna T Lanner |
Journal | Skeletal muscle
(Skelet Muscle)
Vol. 5
Pg. 20
( 2015)
ISSN: 2044-5040 [Print] England |
PMID | 26161253
(Publication Type: Journal Article)
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