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

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)646-652
Number of pages7
JournalExperimental Gerontology
Volume44
Issue number10
DOIs
Publication statusPublished - 2009 Oct
Externally publishedYes

Keywords

  • Adipose tissue
  • Calorie restriction
  • Glucose uptake
  • Growth hormone
  • Insulin signal

ASJC Scopus subject areas

  • Biochemistry
  • Ageing
  • Molecular Biology
  • Genetics
  • Endocrinology
  • Cell Biology

Fingerprint Dive into the research topics of 'Divergent regulation of adipose tissue metabolism by calorie restriction and inhibition of growth hormone signaling'. Together they form a unique fingerprint.

Cite this