Published online before print January 29, 2004, doi: 10.1161/01.ATV.0000118682.58708.78
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© 2004 American Heart Association, Inc.
Vascular Biology |
Peroxisome Proliferator-Activated Receptor 
Agonists Increase Nitric Oxide Synthase Expression in Vascular Endothelial Cells
From the Department of Molecular Medicine, Osaka University Graduate School of Medicine, Osaka, Japan
Correspondence to Soji Kasayama, MD, PhD, Department of Molecular Medicine, Osaka University Graduate School of Medicine (C-4), 2-2 Yamada-oka, Suita, Osaka 565-0871, Japan. E-mail kasayama{at}imed3.med.osaka-u.ac.jp
Objective— There has been accumulating evidence demonstrating that activators for peroxisome proliferator-activated receptor 
(PPAR) have antiinflammatory, antiatherogenic, and vasodilatory effects. We hypothesized that PPAR activators can modulate endothelial nitric oxide synthase (eNOS) expression and its activity in cultured vascular endothelial cells.
Methods and Results— Bovine aortic endothelial cells were treated with the PPAR activator fenofibrate. The amount of eNOS activity and the expression of eNOS protein and its mRNA were determined. Our data show that treatment with fenofibrate for 48 hours resulted in an increase in eNOS activity. Fenofibrate failed to increase eNOS activity within 1 hour. Fenofibrate also increased eNOS protein as well as its mRNA levels. RU486, which has been shown to antagonize PPAR action, inhibited the fenofibrate-induced upregulation of eNOS protein expression. WY14643 and bezafibrate also increased eNOS protein levels, whereas rosiglitazone did not. Transient transfection experiments using human eNOS promoter construct showed that fenofibrate failed to enhance eNOS promoter activity. Actinomycin D studies demonstrated that the half-life of eNOS mRNA increased with fenofibrate treatment.
Conclusions— PPAR activators upregulate eNOS expression, mainly through mechanisms of stabilizing eNOS mRNA. This is a new observation to explain one of the mechanisms of PPAR-mediated cardiovascular protection.
Key Words: atherosclerosis • endothelium • nitric oxide • vascular biology • vasodilatation
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