Recombinant Human HGF (HEK293 cells)
|Description||Hepatocyte growth factor (HGF) is a multifunctional cytokine that was originally described as a mesenchymal-derived factor that regulates cell growth, cell motility, morphogenesis and angiogenesis through activation of its receptor, the transmembrane tyrosine kinase encoded by the c-Met proto-oncogene. HGF and c-Met are often co-expressed or over-expressed in a variety of human malignancies including glioblastoma and medullablastoma. The multifunctional effects of HGF: c-Met signaling in tumor cells are mediated by a network of signal transduction pathways including mitogen-activated protein kinase (MAPK) and phosphoinositide 3-kinase (PI3K). HGF consists of two subunits held by a disulfide bond. The alpha subunit (69 kDa) has a length of 440 amino acids and the beta subunit (34 kDa) has a length of 234 amino acids. The beta chain of the factor shows approximately 38% homology at the protein level to the serine protease domain of plasminogen. Recombinant HGF expressed in human 293 cells and has a molecular mass of 70 kDa, lower compared to the Molecular mass for this cytokine expressed in CHO cells which emphasizes the difference in post translational modifications.|
|Family||Other Growth Factors/Cytokines|
|Aliases||HGF, Hepatopoietin-A, HPTA, Scatter factor, SFRecombinant Human Hepatocyte Growth Factor (HGF)|
|Species||Human (H. sapiens)|
|Molecular Weight||70 kDa, single chain, glycosylated|
|Endotoxin Level||<1 EU/µg of recombinant protein as determined by the LAL method|
|Purity||>95% as determined by SDS-PAGE|
|Function||The EC(50) as determined by the dose-dependent stimulation of the proliferation of the monkey epithelial cell line 4MBr-5 was found to be ? 20 ng/mL.|
|Reconstitution||A quick spin of the vial followed by reconstitution in sterile 1xPBS containing 0.1% endotoxin-free recombinant human serum albumin (HSA).|
|Storage||The lyophilized protein is stable for at least one year from date of receipt at -70°C. Upon reconstitution, this cytokine can be stored in working aliquots at 2° - 8°C for one month, or at -20°C for six months. Avoid repeated freeze/thaw cycles.|
|Usage||For research use only. Not for diagnostic or therapeutic use.|
- Growth Factor eFlyer
- Growth Factor and Cytokine Brochure
- Active Kinases Brochure
- Growth Factors and Cytokines Catalogue
- Growth Factors and Cytokines FAQ
- Role of Growth Factors in Cell Differentiation (Poster)
|How are endotoxin levels measured?|
1. For estimating the endotoxin levels; we use the LAL (Limulus Amebocyte Lysate) method: The lysate from horseshoe crab amebocytes clots in the presence of very low endotoxin. This reaction is the basis of the Limulus amebocyte lysate (LAL) assay which was approved by the FDA in 1970. · Endotoxin is generally measured in Endotoxin Units per milliliter (EU/mL). · For recombinant proteins: EU is reported per microgram of protein. · One EU = 0.1-0.2 ng endotoxin/µg of protein. · At abm, we do the LAL chromogenic assays that can detect down to 0.01 EU/ml.
|With regard to the BSA levels in some Growth Factors and Cytokines, can you please provide an explanation as to why they are so high?|
The amount of BSA, as part of the formulation of a protein, can vary considerably depending on how much BSA was deemed optimum/necessary for protein stability in combination with /in-lieu of - other possible additives. The aforementioned formulations are somewhat analogous to the “carrier” versions of many formulations from “R and D systems” that have as high as 50 µg of BSA per µg of the recombinant protein product. If, needed or desired, abm scientists can substitute BSA for other stabilizing additives for most formulations.
|Are your Escherichia coli sourced growth factors: 1) Human derived materials free? 2) Recombinant proteins free?|
Yes, all of abm's growth factors made in Escherichia coli using recombinant technology contain no human derived-products or other recombinant proteins. In the rare cases of BSA presence, this will be mentioned in the product's formulation.
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