Priority Research Papers:
Syringaresinol protects against hypoxia/reoxygenation-induced cardiomyocytes injury and death by destabilization of HIF-1α in a FOXO3-dependent mechanism
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Siyoung Cho1, Miook Cho2, Juewon Kim1, Matt Kaeberlein3, Sang Jun Lee1 and Yousin Suh2,4,5
1 R&D Unit, Amorepacific Corporation, Yongin-si, Gyeonggi-do, Korea
2 Department of Genetics, Albert Einstein College of Medicine, Bronx, NY, USA
3 Department of Pathology, University of Washington, Seattle, WA, USA
4 Department of Medicine, Diabetes Research and Training Center, Albert Einstein College of Medicine, Bronx, NY, USA
5 Institute for Aging Research, Diabetes Research and Training Center, Albert Einstein College of Medicine, Bronx, NY, USA
Sang Jun Lee, email:
Yousin Suh, email:
Keywords: HIF-1α, Syringaresinol, FOXO3, ischemia/reperfusion, hypoxia/reoxygenation, cardiomyocytes
Received: August 28, 2014 Accepted: November 06, 2014 Published: November 06, 2014
Hypoxia-inducible factor 1 (HIF-1) is a master regulator of hypoxic response and has been a prime therapeutic target for ischemia/reperfusion (I/R)-derived myocardial dysfunction and tissue damage. There is also increasing evidence that HIF-1 plays a central role in regulating aging, both through interactions with key longevity factors including Sirtuins and mTOR, as well as by directly promoting longevity in Caenorhabditis elegans.We investigated a novel function and the underlying mechanism of syringaresinol, a lignan compound, in modulation of HIF-1 and protection against cellular damage and death in a cardiomyocyte model of I/R injury. Syringaresinol caused destabilization of HIF-1α following H/R and then protected against hypoxia/reoxygenation (H/R)-induced cellular damage, apoptosis, and mitochondrial dysfunction in a dose-dependent manner. Knock-down of FOXO3 by specific siRNAs completely abolished the ability of syringaresinol to inhibit HIF-1 stabilization and apoptosis caused by H/R. Syringaresinol stimulated the nuclear localization and activity of FOXO3 leading to increased expression of antioxidant genes and decreased levels of reactive oxygen species (ROS) following H/R. Our results provide a new mechanistic insight into a functional role of syringaresinol against H/R-induced cardiomyocyte injury and death. The degradation of HIF-1α through activation of FOXO3 is a potential therapeutic strategy for ischemia-related diseases.
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