Journal
JOURNALS OF GERONTOLOGY SERIES A-BIOLOGICAL SCIENCES AND MEDICAL SCIENCES
Volume 63, Issue 8, Pages 788-797Publisher
GERONTOLOGICAL SOC AMER
DOI: 10.1093/gerona/63.8.788
Keywords
GHRKO mice; calorie restriction; heart; insulin signaling
Categories
Funding
- National Institute on Aging [AG 19899, U19 AG023122]
- Ellison Medical Foundation
- Southern Illinois University Geriatrics Medicine and Research Initiative
- Career Investigators from Consejo Nacional de Investigaciones Cientificas y Tecnologicas of Argentina (CONICET)
- University of Buenos Aires (UBA)
- Agencia Nacional de Promocion Cientifica y Tecnologica of Argentina
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Calorie restriction (CR) improves insulin sensitivity and increases life span in normal but not in long-lived growth hormone-resistant knockout (GHRKO) mice. In this study, we examined interactive effects of GH resistance and long-term CR on cardiac insulin action. GHRKO mice exhibited marked increases in the insulin-induced phosphorylation of the insulin receptor (IR), insulin receptor substrate-1 (IRS-1), Akt, and ERK1/2 along with elevated insulin-stimulated IRS-1-associated regulatory subunit of phosphatidylinositol 3-kinase in the heart. These changes were associated with elevated protein levels of IR, IRS-1, and Akt and with a down-regulation of cardiac glucose transporter 4 (GLUT4). In normal mice, CR induced an important increase in the phosphorylation of cardiac Akt without elevation of Akt protein, reaching activation levels similar to those seen in GHRKO mice. This change may be cardioprotective and thus contribute to increased longevity in response to CR. Interestingly, the insulin signaling cascade in the heart of GHRKO mice was unaffected by CR.
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