Abstract
Obesity-related disorders are associated with the development of ischemic heart disease. Adiponectin is a circulating adipose-derived cytokine that is downregulated in obese individuals and after myocardial infarction. Here, we examine the role of adiponectin in myocardial remodeling in response to acute injury. Ischemia-reperfusion in adiponectin-deficient (APN-KO) mice resulted in increased myocardial infarct size, myocardial apoptosis and tumor necrosis factor (TNF)-α expression compared with wild-type mice. Administration of adiponectin diminished infarct size, apoptosis and TNF-α production in both APN-KO and wild-type mice. In cultured cardiac cells, adiponectin inhibited apoptosis and TNF-α production. Dominant negative AMP-activated protein kinase (AMPK) reversed the inhibitory effects of adiponectin on apoptosis but had no effect on the suppressive effect of adiponectin on TNF-α production. Adiponectin induced cyclooxygenase (COX)-2–dependent synthesis of prostaglandin E2 in cardiac cells, and COX-2 inhibition reversed the inhibitory effects of adiponectin on TNF-α production and infarct size. These data suggest that adiponectin protects the heart from ischemia-reperfusion injury through both AMPK- and COX-2–dependent mechanisms.
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Acknowledgements
This work was supported by US National Institutes of Health (NIH) grants HL66957, HL77774, AR40197 and AG15052 (to K.W.); NIH Cardiovascular Scientist Training Grant HL07224 (to D.R.P.); and Grant-in-Aid for Scientific Research on Priority Areas (to S.K. and T.F.). R.S. was supported by grants from the American Heart Association Postdoctoral Fellowship Award, Northeast Affiliate and the Uehara Memorial Foundation. N.O. was supported by a Department of Medicine Pilot Project Grant from Boston University. We gratefully acknowledge the technical assistance of S. Tanaka and A. Bialik.
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Supplementary information
Supplementary Fig. 1
Adiponectin deficiency does not affect capillary vessel density. (PDF 153 kb)
Supplementary Fig. 2
Adiponectin deficiency does not affect IL-1β or IL-6 levels. (PDF 200 kb)
Supplementary Fig. 3
The COX-2 inhibitor NS398 does not affect the adiponectin-mediated inhibition of cultured cardiac myocyte and fibroblast apoptosis. (PDF 133 kb)
Supplementary Fig. 4
Adiponectin suppresses LPS-induced TNFα secretion from cardiac fibroblasts through a COX-2-dependent pathway. (PDF 272 kb)
Supplementary Fig. 5
Adiponectin effects in cultured adult rat myocyte cultures. (PDF 562 kb)
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Shibata, R., Sato, K., Pimentel, D. et al. Adiponectin protects against myocardial ischemia-reperfusion injury through AMPK- and COX-2–dependent mechanisms. Nat Med 11, 1096–1103 (2005). https://doi.org/10.1038/nm1295
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DOI: https://doi.org/10.1038/nm1295
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