Cardioprotective effects of short-term caloric restriction are mediated by adiponectin via activation of AMP-activated protein kinase - PubMed (original) (raw)

Cardioprotective effects of short-term caloric restriction are mediated by adiponectin via activation of AMP-activated protein kinase

Ken Shinmura et al. Circulation. 2007.

Abstract

Background: Overeating and obesity are major health problems in developed countries. Caloric restriction (CR) can counteract the deleterious aspects of obesity-related diseases and prolong lifespan. We have demonstrated that short-term CR improves myocardial ischemic tolerance and increases adiponectin levels. Here, we investigated the specific role of adiponectin in CR-induced cardioprotection.

Methods and results: Adiponectin antisense transgenic (Ad-AS) mice and wild-type (WT) mice were randomly assigned to a group fed ad libitum and a CR group (90% of caloric intake of ad libitum for 3 weeks, then 65% for 2 weeks). Isolated perfused mouse hearts were subjected to 25 minutes of ischemia, followed by 60 minutes of reperfusion. CR increased serum adiponectin levels by 84% in WT mice. Gel filtration analysis of the oligomeric complex distribution showed that CR produced a marked increase in the high-molecular-weight complex of adiponectin in WT mice; in contrast, CR did not change serum adiponectin levels or their oligomeric pattern in Ad-AS mice. CR improved the recovery of left ventricular function after ischemia/reperfusion and limited infarct size in WT mice; these effects were completely abrogated in Ad-AS mice. CR also increased the phosphorylated form of AMP-activated protein kinase and acetyl-CoA carboxylase in WT but not in Ad-AS mice. Recombinant adiponectin restored CR-induced cardioprotection in Ad-AS mice, and inhibition of AMP-activated protein kinase phosphorylation completely abrogated CR-induced cardioprotection in WT mice.

Conclusions: The cardioprotective effects of short-term CR are mediated by increased production of adiponectin and the associated activation of AMP-activated protein kinase.

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Comment in

The ischemic heart: starving to stimulate the adiponectin-AMPK signaling axis.
Dyck JR. Dyck JR. Circulation. 2007 Dec 11;116(24):2779-81. doi: 10.1161/CIRCULATIONAHA.107.742023. Circulation. 2007. PMID: 18071087 No abstract available.

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Cardioprotective effects of short-term caloric restriction are mediated by adiponectin via activation of AMP-activated protein kinase - PubMed (original) (raw)