Journals of Gerontology Series A: Biological Sciences and Medical Sciences Large Type Edition
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The Journals of Gerontology Series A: Biological Sciences and Medical Sciences 62:27-33 (2007)
© 2007 The Gerontological Society of America

Involvement of Insulin-Like Growth Factor-1 in the Effect of Caloric Restriction: Regulation of Plasma Adiponectin and Leptin

Haruyoshi Yamaza, Toshimitsu Komatsu, Kazuo To, Hiroaki Toyama, Takuya Chiba, Yoshikazu Higami and Isao Shimokawa

Pathology & Gerontology, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki City, Japan.

Address correspondence to Haruyoshi Yamaza, PhD, DDS, Pathology & Gerontology, Nagasaki University Graduate School of Biomedical Sciences, 12-4 Sakamoto 1-chome, Nagasaki City 852-8523, Japan. E-mail: hyamaza{at}net.nagasaki-u.ac.jp

Insulin-like growth factor (IGF)-1 signaling might partly mediate effects of caloric restriction (CR), an experimental intervention for increasing longevity in mammals. The present study evaluated effects of recombinant human (rh)IGF-1 infusion on adipokine levels in CR and transgenic (Tg) dwarf rats with the reduced growth hormone–IGF-1 axis, which shared similar body weight and food intake. At 9 months of age, each rat received a continuous infusion of rhIGF-1 for 14 days, and rats received an injection of glucose after overnight fasting. Infusion of rhIGF-1 had metabolic effects in all rat groups although it did not affect insulin sensitivity in any of the groups. In addition, plasma adiponectin was decreased to the control group levels and plasma leptin was further reduced in CR and Tg rats. The similarity of phenotypes and adipokine responses to rhIGF-1 between CR and Tg rats supports a role for reduced IGF-1 signaling in the CR effect.






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