In normal development vascular endothelial growth factors (VEGFs) are crucial regulators of vascular development during embryogenesis (vasculogenesis) and blood-vessel formation in the adult (angiogenesis). In tumor progression, activation of VEGF pathways promotes tumor vascularization, facilitating tumor growth and metastasis. Abnormal VEGF function is also associated with inflammatory diseases including atherosclerosis, and hyperthyroidism. The members of the VEGF and VEGF-receptor protein families have distinct but overlapping ligand-receptor specificities, cell-type expression, and function. VEGF-receptor activation in turn regulates a network of signaling processes in the body that promote endothelial cell growth, migration and survival (Hicklin and Ellis, 2005; Shibuya and Claesson-Welsh, 2006). Molecular features of the VGF signaling cascades are outlined in the figure below (from Olsson et al. 2006; Nature Publishing Group). Tyrosine residues in the intracellular domains of VEGF receptors 1, 2,and 3 are indicated by dark blue boxes; residues susceptible to phosphorylation are numbered. A circled R indicates that phosphorylation is regulated by cell state (VEGFR2), by ligand binding (VEGFR1), or by heterodimerization (VEGFR3). Specific phosphorylation sites (boxed numbers) bind signaling molecules (dark blue ovals), whose interaction with other cytosolic signaling molecules (light blue ovals) leads to specific cellular (pale blue boxes) and tissue-level (pink boxes) responses in vivo. Signaling cascades whose molecular details are unclear are indicated by dashed arrows. DAG, diacylglycerol; EC, endothelial cell; eNOS, endothelial nitric oxide synthase; FAK, focal adhesion kinase; HPC, hematopoietic progenitor cell; HSP27, heat-shock protein-27; MAPK, mitogen-activated protein kinase; MEK, MAPK and ERK kinase; PI3K, phosphatidylinositol 3' kinase; PKC, protein kinase C; PLCgamma, phospholipase C-gamma; Shb, SH2 and beta-cells; TSAd, T-cell-specific adaptor. In the current release, the first events in these cascades - the interactions between VEGF proteins and their receptors - are annotated. Details of signaling events and their biological outcome, concisely illustrated in the image below, will be available in future versions of this pathway.
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VEGFR-2 binds VEGF-A, -C, -D, and -E homodimers. VEGFR-2 is the primary mediator of the physiological effects of VEGF-A in angiogenesis, including microvascular permeability, endothelial cell proliferation, invasion, migration, and survival. In endothelial cells, these effects are mediated via activation of a phospholipase gamma-protein kinase C-Raf-MAPK signaling pathway for proliferation and PI3K and focal adhesion kinase for survival and migration. VEGFR-2 is the important receptor among VEGFR protiens and its activation and signaling may be positively or negatively regulated by co-expression and activation of various factors and other VEGF receptors like VEGFR-1 (Hicklin and Ellis 2005).The regulatory events of this receptor will be annotated in subsequent modules.
Plasma membrane-associated Neuropilin-1 (NRP1) binds vascular endothelial growth factor (VEGF) family members. NRP1 has three distinct extracellular domains, a1a2, b1b2, and c but lacks a distinct intracellular domain. VEGF165 mediates the formation of complexes containing VEGFR-2 and NRP-1, enhancing VEGF165-receptor binding on the endothelial cell membrane (Soker et al. 2002). The role of heparin, a critical component of NRP-1 interactions with VEGF proteins, will annotated in detail in future.
VEGFR-3 preferentially binds VEGF-C and -D. Mutations of the VEGFR-3 tyrosine kinase domain are seen in human lymphedema. VEGFR-3 expression has been correlated with transient lymphangiogenesis in wound healing and may modulate VEGFR-2 signaling in maintaining vascular integrity (Hicklin and Ellis 2005).
VEGFR-1 binds VEGF-A, VEGF-B, and PLGF homodimers. This interaction is required for normal angiogenesis and hematopoiesis, although many of the detailed molecular steps from binding to these physiological consequences remain unclear (Hickins and Ellis, 2005). VEGFR-1 is made up of 1338 aa and has three regions: an extracellular region consisting of 7 immunoglobin-like domains, a transmembrane (TM) domain and a cytosolic tyrosine kinase (TK) domain. An alternatively spliced form, soluble VEGFR-1 (sVEGFR1), also binds VEGF proteins and may serve in the body to down-regulate VEGF activation of membrane-bound receptors. Overexpression of sVEGFR1 (VEGF121) is associated with preeclampsia, a major disorder of pregnancy (Shibuya and Claesson-Welsh 2006; Levine et al. 2004).
VEGF proteins bind their receptors as homodimers. Heterodimers with PLGF and among different VEGF proteins have been observed but have no known function.
NRP-2 associates with VEGFR-1 on the plasma membrane. As NRP-2 lacks an intracellular domain, this association may be the means by which NRP-2 participates in VEGF-induced signaling. This interaction requires VEGF to bridge between NRP and the receptor.
Molecular features of the VGF signaling cascades are outlined in the figure below (from Olsson et al. 2006; Nature Publishing Group). Tyrosine residues in the intracellular domains of VEGF receptors 1, 2,and 3 are indicated by dark blue boxes; residues susceptible to phosphorylation are numbered. A circled R indicates that phosphorylation is regulated by cell state (VEGFR2), by ligand binding (VEGFR1), or by heterodimerization (VEGFR3). Specific phosphorylation sites (boxed numbers) bind signaling molecules (dark blue ovals), whose interaction with other cytosolic signaling molecules (light blue ovals) leads to specific cellular (pale blue boxes) and tissue-level (pink boxes) responses in vivo. Signaling cascades whose molecular details are unclear are indicated by dashed arrows. DAG, diacylglycerol; EC, endothelial cell; eNOS, endothelial nitric oxide synthase; FAK, focal adhesion kinase; HPC, hematopoietic progenitor cell; HSP27, heat-shock protein-27; MAPK, mitogen-activated protein kinase; MEK, MAPK and ERK kinase; PI3K, phosphatidylinositol 3' kinase; PKC, protein kinase C; PLCgamma, phospholipase C-gamma; Shb, SH2 and beta-cells; TSAd, T-cell-specific adaptor.
In the current release, the first events in these cascades - the interactions between VEGF proteins and their receptors - are annotated. Details of signaling events and their biological outcome, concisely illustrated in the image below, will be available in future versions of this pathway.
Original Pathway at Reactome: http://www.reactome.org/PathwayBrowser/#DB=gk_current&FOCUS_SPECIES_ID=48887&FOCUS_PATHWAY_ID=194138
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