Recombinant Human VEGF 189

The lyophilized protein is stable for a few weeks at room temperature, but is best stored at -20C to -80C. After reconstitution, store in working aliquots at -20C. Avoid repeated freeze-thaw cycles.

Human Vascular Endothelial Growth Factor (VEGF189), a 21 kDa protein consisting of 189 amino acid residues, is produced as a homodimer. VEGF is a polypeptide growth factor and a member of the platelet-derived growth factor family. It is a specific mitogen for vascular endothelial cells and a strong angiogenic factor, in vivo . Two high-affinity tyrosine kinase receptors for VEGF165 have been identified, VEGFR-1 (FLT-1), and VEGFR-2 (KDR). Consistent with the endothelial cell-specific action of VEGF165, expression of both receptor genes has been found predominantly but not exclusively on endothelial cells. Expression of VEGFR-1 was also found on human monocytes, neutrophils (PMNs), bovine brain pericytes and villous and extravillous trophoblasts. In addition to its action as a mitogen it is a potent vasular permeability factor (VPF), in vivo . VEGF165 is also a chemoattractant molecule for monocytes and endothelial cells. Five different proteins are generated by diffential splicing: VEGF121, VEGF145, VEGF165, VEGF189 and VEGF206. The most abdundant form is VEGF165. Whereas VEGF121 and VEGF165 are secreted proteins, VEGF145, VEGF189 and VEGF206 are strongly cell-associated. The isoforms VEGF145, VEGF165 and VEGF189 bind to heparin with high affinity. VEGF165 is apparently a homodimer, but preparations of VEGF165 show some heterogeneity on SDS gels, depending on the secretion of different glycosylation patterns. All dimeric forms have similar biological activities but their bio-availability is very different. There is good evidence that heterodimeric molecules between the different isoforms also exist and that different cells and tissues express different VEGF isoforms. The other members of this increasing growth factor family are VEGF-B, -C, -D and -E. Another member is the Placenta growth factor PlGF.

Centrifuge vial prior to opening. Reconstitute in water to a concentration no less than 50 ug/ml. For long term storage, we recommend adding at least 0.1% HSA or BSA.

< 0.1 ng/ug of VEGF189