Analysis of biological effects and signaling properties of Flt-1 (VEGFR-1) and KDR (VEGFR-2). A reassessment using novel receptor-specific vascular endothelial growth factor mutants.
J Biol Chem
; 276(5): 3222-30, 2001 Feb 02.
Article
em En
| MEDLINE
| ID: mdl-11058584
ABSTRACT
Endothelial cells express two related vascular endothelial growth factor (VEGF) receptor tyrosine kinases, KDR (kinase-insert domain containing receptor, or VEGFR-2) and Flt-1 (fms-like tyrosine kinase, or VEGFR-1). Although considerable experimental evidence links KDR activation to endothelial cell mitogenesis, there is still significant uncertainty concerning the role of individual VEGF receptors for other biological effects such as vascular permeability. VEGF mutants that bind to either KDR or Flt-1 with high selectivity were used to determine which of the two receptors serves to mediate different VEGF functions. In addition to mediating mitogenic signaling, selective KDR activation was sufficient for the activation of intracellular signaling pathways implicated in cell migration. KDR stimulation caused tyrosine phosphorylation of both phosphatidylinositol 3-kinase and phospholipase Cgamma in primary endothelial cells and stimulated cell migration. KDR-selective VEGF was also able to induce angiogenesis in the rat cornea to an extent indistinguishable from wild type VEGF. We also demonstrate that KDR, but not Flt-1, stimulation is responsible for the induction of vascular permeability by VEGF.
Buscar no Google
Base de dados:
MEDLINE
Assunto principal:
Endotélio Vascular
/
Transdução de Sinais
/
Proteínas Proto-Oncogênicas
/
Receptores de Fatores de Crescimento
/
Receptores Proteína Tirosina Quinases
Limite:
Humans
Idioma:
En
Ano de publicação:
2001
Tipo de documento:
Article