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Am J Physiol Cell Physiol 279: C1414-C1424, 2000;
0363-6143/00 $5.00
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Vol. 279, Issue 5, C1414-C1424, November 2000

The Egr-1 gene is induced by epidermal growth factor in ECV304 cells and primary endothelial cells

Jo C. Tsai, Lixin Liu, Jiazhen Guan, and William C. Aird

Department of Molecular Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts 02215

The early growth response (Egr)-1 transcription factor serves to couple changes in the extracellular environment to alterations in gene expression. An understanding of the mechanisms that underlie Egr-1 gene regulation should provide important insights into how environmental signals are transduced by endothelial cells. The aim of the present study was to determine whether epidermal growth factor (EGF) induces Egr-1 expression in endothelial cells. In ECV304 cells, Egr-1 mRNA and protein levels were increased in response to EGF. In stable transfection assays, the 1,200-bp promoter of the mouse Egr-1 gene contained information for EGF response via a protein kinase C-independent, mitogen-activated protein kinase-dependent pathway. The endogenous Egr-1 gene was similarly responsive to EGF in primary human umbilical vein endothelial cells, human coronary artery endothelial cells, and rat fat pad endothelial cells, but not in bovine aortic endothelial cells, calf pulmonary artery endothelial cells, or PY-4-1 endothelial cells. Together, these results suggest that the Egr-1 gene is responsive to EGF in a subset of endothelial cells.

gene regulation; growth factors; endothelium


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