Egr-1-induced endothelial gene expression: a common theme in vascular injury

Science
L M KhachigianT Collins

Abstract

A number of pathophysiologically relevant genes, including platelet-derived growth factor B-chain (PDGF-B), are induced in the vasculature after acute mechanical injury. In rat aorta, the activated expression of these genes was preceded by a marked increase in the amount of the early-growth-response gene product Egr-1 at the endothelial wound edge. Egr-1 interacts with a novel element in the proximal PDGF-B promoter, as well as with consensus elements in the promoters of other genes induced by endothelial injury. This interaction is crucial for injury-induced PDGF-B promoter-dependent expression. Sp1, whose binding site in the PDGF-B promoter overlaps that of Egr-1, occupies this element in unstimulated cells and is displaced by increasing amounts of Egr-1. These findings implicate Egr-1 in the up-regulated expression of PDGF-B and other potent mediators in mechanically injured arterial endothelial cells.

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