Fasting-related autophagic response in slow- and fast-twitch skeletal muscle

Tomonori Ogata, Yasuharu Oishi, Mitsuru Higuchi, Isao Muraoka

Research output: Contribution to journalArticlepeer-review

50 Citations (Scopus)

Abstract

This study investigated regulation of autophagy in slow-twitch soleus and fast-twitch plantaris muscles in fasting-related atrophy. Male Fischer-344 rats were subjected to fasting for 1, 2, or 3 days. Greater weight loss was observed in plantaris muscle than in soleus muscle in response to fasting. Western blot analysis demonstrated that LC3-II, a marker protein for macroautophagy, was expressed at a notably higher level in plantaris than in soleus muscle, and that the expression level was fasting duration-dependent. To identify factors related to LC3-II enhancement, autophagy-related signals were examined in both types of muscle. Phosphorylated mTOR was reduced in plantaris but not in soleus muscle. FOXO3a and ER stress signals were unchanged in both muscle types during fasting. These findings suggest that preferential atrophy of fast-twitch muscle is associated with induction of autophagy during fasting and that differences in autophagy regulation are attributable to differential signal regulation in soleus and plantaris muscle.

Original languageEnglish
Pages (from-to)136-140
Number of pages5
JournalBiochemical and Biophysical Research Communications
Volume394
Issue number1
DOIs
Publication statusPublished - 2010 Mar 26

Keywords

  • Autophagy
  • LC3
  • Skeletal muscle
  • mTOR
  • p62

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Molecular Biology
  • Cell Biology

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