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|Purity Confirmation||> 95% by SDS-PAGE|
|Molecular Weight||~34.0 kDa|
|Biological Activity||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.|
|Buffer||50mM acetic acid|
|Reconstitution||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.|
|Stability and Storage||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.|
|Synonyms||PlGF; placental growth factor|
|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 controversal. In several reports it was shown not to be a potent mitogen for endotehlial 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.|
- Inter-manufacturer Comparison of Automated Immunoassays for the Measurement of Soluble FMS-like Tyrosine kinase-1 and Placental Growth Factor. Y. Kwun Yue Cheng et al., Pregnancy Hypertens. 2019 Jul;17:165-171.
- Cryopreservation of primary human monocytes does not negatively affect their functionality or their ability to be labelled with radionuclides: basis for molecular imaging and cell therapy. E. Pardali et al., EJNMMI Res. 2016; 6: 77.
- Proteolytic Processing Regulates Placental Growth Factor Activities. D. C. Hoffmann et al., J Biol Chem. 2013 Jun 21; 288(25): 17976–17989.
- Autocrine activity of soluble Flt-1 controls endothelial cell function and angiogenesis. S. Ahmad et al., Vasc Cell. 2011; 3: 15.
- The VEGF-induced transcriptional response comprises gene clusters at the crossroad of angiogenesis and inflammation. B. Schweighofer et al., Thromb Haemost. 2009 Sep; 102(3): 544–554.
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