Technical Data
Platelet Derived Growth Factor AB, Recombinant, Human (PDGF-AB, PDGF alpha, beta Polypeptide, Becaplermin, Heterodimer Platelet-derived Growth Factor, Glioblastoma-derived T-cell Suppressor Factor, BSC-1 Cell Growth Inhibitor, Polyergin, Cetermin, TGFB2,
Growth Factors, Cytokines Storage: -20CShipping: Blue Ice
PDGFs are disulfide-linked dimers consisting of two 12-13.5kD polypeptide chains, designated PDGF-A and PDGF-B chains. The three naturally occurring PDGFs (PDGF-AA, PDGF-BB and PDGF-AB) are potent mitogens for a variety of cell types including smooth muscle cells, connective tissue cells, bone and cartilage cells, and some blood cells. The PDGFs are stored in platelet -granules and are released upon platelet activation. The PDGFs are involved in a number of biological processes, including hyperplasia, chemotaxis, embryonic neuron development, and respiratory tubule epithelial cell development. Two distinct signaling receptors used by PDGFs have been identified and named PDGFR- and PDGFR- . PDGFR- is high-affinity receptor for each of the three PDGF forms. On the other hand, PDGFR- interacts with only PDGF-BB and PDGF-AB. Recombinant human PDGF-AB is a 25.5kD disulfide-linked dimer, consisting of one A chain and one B chains (234 total amino acids).

Platelet-derived growth factor (PDGF) was discovered as a major mitogenic factor present in serum but absent from plasma. It was found to be secreted from the a-granules of platelets activated during the coagulation of blood to form serum. PDGF is a dimeric combination of two distinct but structurally related peptide chains designated A and B. The dimeric isoforms PDGF-AA, AB and BB are differentially expressed in various cell types and their effects are mediated through two distinct receptors, termed a and b. Differences exist in isoform binding to each receptor. In general, PDGF isoforms are potent mitogens for connective tissue cells, including dermal fibroblasts, glial cells, arterial smooth muscle cells and some epithelial and endothelial cells. In addition to its activity as a mitogen, PDGF is chemotactic for fibroblasts, smooth muscle cells, neutrophils and mononuclear cells. Other reported activities for PDGF include stimulation of granule release by neutrophils and monocytes, facilitation of steroid synthesis by Leydig cells, stimulation of neutrophil phagocytosis, inhibition of natural killer (NK) cell activity, stimulation of collagen synthesis, modulation of thrombospondin expression and secretion, stimulation of collagenase activity and secretion, induction of contraction of rat aorta strips in vitro, and transient induction of T cell IL-2 secretion accompanied by a down-regulation of IL-4 and IFN-y production, temporary effects that may allow clonal expansion of antigen-activated B and T helper lymphocytes prior to differentiation. PDGF also appears to be ubiquitous in neurons throughout the CNS, where it is suggested to play an important role in neuron survival and regeneration, and in mediation of glial cell proliferation and differentiation.

Biological Activity:
Human PDGF-AB is fully biologically active when compared to standards. The ED50 as determined by the dose-dependent stimulation of proliferation of Balb/c 3T3 cells. The expected ED50 for this effect is 1-3ng/ml.

Responding Cells (partial list): Fibroblasts, connective tissue

Concentration Range: 0.2-10ng/ml for most in vitro applications.

AA Sequence :


Storage and Stability:
Lyophilized powder may be stored at -20C. Stable for 12 months at -20C. Reconstitute with 10mM Acetic Acid, 0.1% BSA or HSA . Aliquot to avoid repeated freezing and thawing. Store at -20C. For maximum recovery of product, centrifuge the original vial after thawing and prior to removing the cap. Further dilutions can be made in assay buffer.

Country of Origin: USA

Molecular Weight:
Source: E. coli
Purity: 97% by SDS-PAGE and HPLC analyses. Endotoxin: 0.1ng/ug (1EU/ug)
Form: Lyophilized protein without additives. Reconstitute with 10mM Acetic Acid, 0.1% BSA or HSA to 0.1-1mg/ml. Do not vortex.

Important Note: This product as supplied is intended for research use only, not for use in human, therapeutic or diagnostic applications without the expressed written authorization of United States Biological.
1. Larsson, H., et al., Fibroblast Growth Factor Receptor-1- mediated Endothelial Cell Proliferation Is Dependent on the Src Homology (SH) 2/SH3 Domain-containing Adaptor Protein Crk, J. Biol. Chem. 274 (36): 25726-25734 (1999). 2. Wang, L.H., et al., Transient Effect of Platelet-derived Growth Factor on GLUT4 Translocation in 3T3 -L1 Adipocytes, J. Biol.Chem. 274 (27): 19246-19253 (1999). 3. Qi, J.Hh., et al., Tyrosine Phosphatase SHP-2 Is Involved in Regulation of Platelet-derived Growth Factor-Induced Migration, J. Biol. Chem. 274 (20): 14455-14463 (1999).

Intended for research use only. Not for use in human, therapeutic, or diagnostic applications.