PlGF-1

• Description :

  Human Placenta Growth Factor-1 (PlGF-1), a 19 kDa protein consisting of 131 amino acid residues is produced as a homodimer. Human Placenta Growth Factor (PlGF) is a polypeptide growth factor and a member of the platelet-derived growth factor family but more related to vascular endothelial growth factor (VEGF) . PlGF-1 acts only as a very weak mitogen for some endothelial cell types and as a potent chemoattractant for monocytes. The physiological function in vivo is still controversial. In several reports it was shown not to be a potent mitogen for endothelial cells and not angiogenic in vivo by using different assays. Very recently it was shown by one investigator, that PlGF-1 from cell culture supernatants was angiogenic in the CAM assay and in the rabbit cornea assay. At least one high-affinity receptor for PlGF (FLT-1 or VEGF-R1) has been demonstrated in different primary cell types (e.g. human umbilical vein endothelial cells and monocytes) but PlGF does not bind to KDR/flk-1. Two different proteins can be generated by differential splicing of the human PlGF gene: PlGF-1 (131 aa native chain) and PlGF-2 (152 aa native chain) . Both mitogens are secretable proteins, but PlGF-2 can bind to heparin with high affinity. PlGF-1 is a homodimer, but preparations of PlGF show some heterogeneity on SDS gels depending of the varying degrees of glycosylation. All dimeric forms posses a similar biological profile. There is good evidence that heterodimeric molecules between VEGF and PlGF exists and that they are biological active. Different cells and tissues (e.g. placenta) express PlGF-1 and PlGF-2 at different rates. A very related protein of PlGF is VEGF with about 53% homology and VEGF-B with similar biological activities.

• Synonyms :

  PlGF; placental growth factor

• NCBI Gene ID :

  5228

• UniProt :

  P49763

• Accession Number :

  NP_001193941.1

• Accession Number mRNA :

  NM_001207012.1

• Chromosomal Location :

  2p21-p16

• Reactivity :

  Human

• Cross Reactivity :

  Human

• Sequence :

  LPAVPPQQWALSAGNGSSEVEVVPFQEVWGRSYCRALERLVDVVSEYPSEVEHMFSPSCVSLLRCTGCCGDENLHCVPVETANVTMQLLKIRSGDRPSYVELTFSQHVRCECRPLREKMKPERCGDAVPRR

• Assay Protocol :

  Centrifuge vial prior to opening. The PlGF-1 is supplied in lyophilized form with carrier-protein (BSA) and can be reconstituted with 50mM acetic acid or PBS/water. This solution can be diluted into other buffered solutions or stored frozen for future use.

• Purity :

  > 95% by SDS-PAGE

• Bioactivity :

  Measured by its ability to bind to immobilized rh-sFlt-1 in a functional ELISA. Recombinant human PlGF-1 can bind to immobilized rh-sFlt-1 (100ng/well) with a linear range at 0.5 - 10ng/ml.

• Length :

  131

• Form :

  Lyophilized

• Buffer :

  50mM acetic acid

• Additives :

  BSA (50-fold)

• Reconstitution :

  50 mM acetic acid

• Molecular Weight :

  ~ 34.0 kDa

• Storage Conditions :

  The lyophilized human PlGF-1, though stable at room temperature, is best stored in working aliquots at -20°C to -70°C. Avoid repeated freeze-thaw cycles.

• Host or Source :

  Insect cells