Arteriosclerosis, Thrombosis, and Vascular Biology. 1997;17:2280-2286
© 1997 American Heart Association, Inc.
Articles |
Egr-1 is Activated in Endothelial Cells Exposed to Fluid Shear Stress and Interacts With a Novel Shear-Stress-Response Element in the PDGF A-Chain Promoter
From the Vascular Research Division, Department of Pathology, Brigham and Women's Hospital and Harvard Medical School, Boston Mass.
Correspondence to Tucker Collins, MD, PhD, Vascular Research Division, Department of Pathology, Brigham and Women's Hospital, 221 Longwood Avenue, Boston MA 02115.
Abstract Exposure of vascular endothelial cells to fluid mechanical forces can modulate the expression of many genes involved in vascular physiology and pathophysiology. Here, we report that platelet-derived growth factor (PDGF) A-chain gene expression is induced at the level of transcription in cultured bovine aortic endothelial cells exposed to a physiologic level of steady laminar shear stress (10 dyn/cm2). 5' Deletion analysis of the human PDGF-A promoter revealed that a GC-rich region near the TATA box was required for shear-inducible reporter gene expression. This element conferred shear inducibility onto a heterologous promoter-reporter construct that was otherwise unresponsive to shear stress. The induction of PDGF-A expression by shear was preceded by rapid and transient induction in the expression of the immediate-early gene, egr-1, which binds to GC-rich sequences. Gel shift studies indicated that shear-induced Egr-1 bound to the proximal PDGF-A promoter in a specific and time-dependent manner, displacing Sp1 from their overlapping recognition elements. Overlapping consensus binding sites for Egr-1 and Sp1 also appear in the proximal promoters of several other endothelial genes, including transforming growth factor-ß1 and tissue factor, whose expression is modulated by shear stress. These findings define the Egr-1 binding site in the proximal PDGF-A promoter as a shear-stress-responsive element and suggest that shear-stimulated Egr-1 gene expression may be a unifying theme in the induction of various other endothelial genes exposed to biomechanical forces.
Key Words: platelet-derived growth factor A-chain • Egr-1 • fluid shear stress • vascular endothelial cells
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