Articles |
From the Departments of Medicine and Pharmacology, Emory University School of Medicine, and the Atlanta Veterans Administration Medical Center, Atlanta, Ga.
Correspondence to David G. Harrison, MD, Cardiology Division, PO Box LL, Emory University School of Medicine, Atlanta, GA 30322.
Abstract The promoter region of the endothelial cell nitric oxide synthase (ecNOS) gene contains potential response elements for transforming growth factorß1 (TGFß1). TGFß1 plays an important role in the pathogenesis of atherosclerosis, vascular hypertrophy, and angiogenesis. We therefore sought to determine whether TGFß1 might modulate ecNOS expression in bovine aortic endothelial cells (BAEC). TGFß1 increased ecNOS mRNA in a dose-dependent manner. TGFß1 also increased ecNOS protein content. The production of nitrogen oxides (NOx), assessed by chemiluminescence, and nitric oxide synthase activity, assessed by arginine/citrulline conversion, were increased in TGFß1-treated cells. Transcriptional activity of the 5'-flanking promoter region of the ecNOS gene was increased by TGFß1, as assessed by transfection with promoter/luciferase constructs. Deletion analysis suggested that the TGFß1-response element was present between nucleotides -1269 and -935 from the first transcription start site, in which a putative nuclear factor1 (NF-1) binding site existed. Gel shift assays showed that nuclear protein(s), immunologically similar to CCAAT transcription factor/NF-1, bound to the putative NF-1 binding site in a sequence-specific manner. Mutation of the putative NF-1 binding site in the promoter/luciferase construct significantly decreased the responsiveness to TGFß1. In conclusion, TGFß1 increases ecNOS expression associated with an increase in production of NO in BAEC. This response is probably mediated by transcriptional activation of the ecNOS gene promoter.
Key Words: nitric oxide synthase transforming growth factorß1 endothelium nuclear factor1
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