Cysteine Suppresses Oxidative Stress-Induced Myofibrillar Proteolysis in Chick Myotubes
NAKASHIMA, Kazuki | MASAKI, Shigehiko | YAMAZAKI, Makoto | Abe, Hiroyuki
The effects of cysteine as an antioxidant nutrient on change in protein modification and myofibrillar proteolysis in chick myotubes by induction of oxidative stress by H₂O₂ treatment were investigated. Myotubes were treated for 1 h with H₂O₂ (1 mM). After this treatment, the H₂O₂ was removed and the cells were cultured in cysteine (0.1 and 1 mM) containing serum-free medium for 24 h. Protein carbonyl content as an index of protein modification and Nτ-methylhistidine release as an index of myofibrillar proteolysis were increased at 24 h after H₂O₂ treatment, and the increment was reduced by cysteine. Calpain, proteasome and cathepsin (B+L and D) activities were increased at 24 h after H₂O₂ treatment, and the increment was also reduced by cysteine. These results indicate that cysteine suppresses protein modification by oxidative stress, resulting in a decrease of protease acitivities, finally resulting in a decrease in myofibrillar proteolysis in chick myotubes.
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