Divergent regulation of adipose tissue metabolism by calorie restriction and inhibition of growth hormone signaling

Seongjoon Park, Toshimitsu Komatsu, Hiroko Hayashi, Lucas Siqueira Trindade, Haruyoshi Yamaza, Takuya Chiba, Isao Shimokawa

研究成果: Contribution to journalArticle査読

4 被引用数 (Scopus)

抄録

Calorie restriction (CR) and a reduced growth hormone (GH) signal affect insulin sensitivity and lifespan in mammals in a similar manner. We investigated the effects of CR and moderate inhibition of GH on glucose-stimulated activation of insulin signaling and the expression of genes related to fat metabolism in white adipose tissue (WAT) in rats. We used 10-month-old male, wild-type (W) Wistar rats, fed ad libitum (AL) or a 30% CR diet from 6 weeks of age, and transgenic (Tg) rats with moderately suppressed GH signaling. Rats were killed 15 min after an intraperitoneal injection of glucose or saline. In control W-AL rats, the levels of serum insulin, phosphorylated (p) insulin receptor (pY-IR), p-Akt, and the expression of glucose transporter (Glut) 4 in the membrane fraction were greater in the glucose-injected group than in the saline-injected group, indicating significant activation of insulin signaling in response to glucose loading. In the W-CR and Tg-AL rats, the serum insulin and pY-IR levels were lower than those in the W-AL rats. The Akt-Glut pathway was up-regulated even after saline-injection. Expression levels of adipogenic and lipogenic genes including PPARγ, adiponectin, and its receptors, were higher in the W-CR rats than in the W-AL and Tg-AL rats. The present findings indicate adipose tissue metabolic profiles specific to CR.

本文言語英語
ページ(範囲)646-652
ページ数7
ジャーナルExperimental Gerontology
44
10
DOI
出版ステータス出版済み - 10 2009
外部発表はい

All Science Journal Classification (ASJC) codes

  • 生化学
  • 加齢科学
  • 分子生物学
  • 遺伝学
  • 内分泌学
  • 細胞生物学

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