Published online before print October 2, 2003, doi: 10.1161/01.ATV.0000098644.03153.6F
© 2003 American Heart Association, Inc.
Vascular Biology |
Vascular Endothelial Growth Factor–Regulated Gene Expression in Endothelial Cells
KDR-Mediated Induction of Egr3 and the Related Nuclear Receptors Nur77, Nurr1, and Nor1
From BHF Laboratories, Department of Medicine, University College London, London, UK.
Correspondence to Ian Zachary, BHF Laboratories, Department of Medicine, Rayne Bldg, University College London, 5 University St, London WC1E 6JJ, UK. E-mail I.Zachary{at}ucl.ac.uk
Objective— The program of gene expression regulated by vascular endothelial growth factor (VEGF) remains poorly understood. The aim of this study was to identify VEGF-regulated genes in human umbilical vein endothelial cells.
Methods and Results— VEGF-regulated gene expression was analyzed by screening Affymetrix oligonucleotide arrays and quantitative, real-time, reverse transcription–polymerase chain reaction. The most strongly induced genes were the NR4A nuclear receptor family members Nur77, Nurr1, and Nor1 and the zinc-finger transcription factor Egr3. VEGF also induced rapid expression of Down syndrome candidate region 1, cyclooxygenase-2, tissue factor, stanniocalcin-1, the serine/threonine kinase Cot, and eps15 homology domain-containing protein. VEGF-induced NR4A family and Egr3 expression was blocked by a KDR inhibitor, and placental growth factor and basic fibroblast growth factor weakly increased expression of these genes. Induction of NR4A genes was mediated via intracellular Ca2+, protein kinase C- and calcineurin-dependent pathways. VEGF increased protein expression of Nurr1 and Nur77 and decreased Nur77 phosphorylation at the negative regulatory site serine 351.
Conclusions— VEGF induces expression of NR4A nuclear receptors and Egr3 via KDR and KDR-mediated signaling mechanisms. The genes identified here are novel candidates as key early mediators of VEGF-induced endothelial functions.
Key Words: vascular endothelial growth factor • basic fibroblast growth factor • gene array
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