Effects of Serum Deprivation on Expression of Proteolytic-Related Genes in Chick Myotube Cultures

  • NAKASHIMA Kazuki
    Nutrient Function Laboratory, Department of Animal Physiology and Nutrition, National Institute of Livestock and Grassland Science
  • YAMAZAKI Makoto
    Nutrient Function Laboratory, Department of Animal Physiology and Nutrition, National Institute of Livestock and Grassland Science
  • ABE Hiroyuki
    Nutrient Function Laboratory, Department of Animal Physiology and Nutrition, National Institute of Livestock and Grassland Science

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We previously reported that serum deprivation stimulates myofibrillar proteolysis in chick myotubes. In the present study, we examined the effect of serum deprivation on expression of the proteolytic-related genes (ubiquitin, proteasome, calpains, and cathepsin B) by real-time PCR of cDNA in chick myotubes. Myotubes were incubated with serum-free medium for 24 h. Ubiquitin and proteasome subunits (C1 and C2) and calpains (m-, μ-, and p94/calpain-3) but not cathepsin B mRNA expression were increased by serum deprivation. These results indicate that serum deprivation stimulates ubiquitin-proteasome and calpain proteolytic pathways, resulting in an increase in myofibrillar proteolysis in chick myotubes.

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