Effects of acute exercise combined with calorie restriction initiated late-in-life on insulin signaling, lipids, and glucose uptake in skeletal muscle from old rats

Kentaro Oki, Edward B. Arias, Makoto Kanzaki, Gregory D. Cartee

研究成果: Article査読

2 被引用数 (Scopus)

抄録

We evaluated effects of calorie restriction (CR: consuming 60–65% of ad libitum [AL] intake) initiated late-in-life with or without acute exercise on insulin-stimulated glucose uptake (ISGU) of skeletal muscle by studying four groups of 26-month-old rats: sedentary-AL, sedentary-CR (8-week duration), 3 hours post-exercise (3hPEX)-AL and 3hPEX-CR. ISGU was determined in isolated epitrochlearis muscles incubated ± insulin. Muscles were assessed for signaling proteins (immunoblotting) and lipids (mass spectrometry). ISGU from sedentary-CR and 3hPEX-AL exceeded sedentary-AL; 3hPEX-CR exceeded all other groups. Akt (Ser473, Thr308) and Akt substrate of 160 kDa (AS160; Ser588, Thr642, Ser704) phosphorylation levels tracked with ISGU. Among the 477 lipids detected, 114 were altered by CR (including reductions in 15 of 25 acylcarnitines), and 27 were altered by exercise (including reductions in 18 of 22 lysophosphatidylcholines) with only six lipids overlapping between CR and exercise. ISGU significantly correlated with 23 lipids, including: acylcarnitine 20:1 (r = .683), lysophosphatidylethanolamine19:0 (r = –.662), acylcarnitine 24:0 (r = .611), and plasmenyl-phosphatidylethanolamine 37:5 (r = –.603). Muscle levels of ceramides (a lipid class previously linked to insulin resistance) were not altered by CR and/or exercise nor significantly correlated with ISGU, implicating other mechanisms (which potentially involve other lipids identified in this study) for greater ISGU and Akt and AS160 phosphorylation with these interventions.

本文言語English
ページ(範囲)207-217
ページ数11
ジャーナルJournals of Gerontology - Series A Biological Sciences and Medical Sciences
75
2
DOI
出版ステータスPublished - 2020 2月 1

ASJC Scopus subject areas

  • 加齢科学
  • 老年医学

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