Vaticanol C, a resveratrol tetramer, activates PPAR and PPARβ/δ in vitro and in vivo

Abstract

Background: Appropriate long-term drinking of red wine is associated with a reduced risk of cardiovascular disease. Resveratrol, a well-known SIRT1 activator is considered to be one of the beneficial components contained in red wine, and also developed as a drug candidate. We previously demonstrated that resveratrol protects brain against ischemic stroke in mice through a PPAR-dependent mechanism. Here we report the different effects of the oligomers of resveratrol. Methods. We evaluated the activation of PPARs by ε-viniferin, a resveratrol dimer, and vaticanol C, a resveratrol tetramer, in cell-based reporter assays using bovine arterial endothelial cells, as well as the activation of SIRT1. Moreover, we tested the metabolic action by administering vaticanol C with the high fat diet to wild-type and PPAR-knockout male mice for eight weeks. Results: We show that vaticanol C activates PPAR and PPARβ/δ in cell-based reporter assays, but does not activate SIRT1. -Viniferin shows a similar radical scavenging activity as resveratrol, but neither effects on PPARs and SIRT-1. Eight-week intake of vaticanol C with a high fat diet upregulates hepatic expression of PPAR-responsive genes such as cyp4a10, cyp4a14 and FABP1, and skeletal muscle expression of PPARβ/δ-responsive genes, such as UCP3 and PDK4 (pyruvate dehydrogenase kinase, isoform 4), in wild-type, but not PPAR-knockout mice. Conclusion: Vaticanol C, a resveratrol tetramer, activated PPAR and PPARβ/δ in vitro and in vivo. These findings indicate that activation of PPAR and PPARβ/δ by vaticanol C may be a novel mechanism, affording beneficial effects against lifestyle-related diseases. © 2010 Tsukamoto et al; licensee BioMed Central Ltd.