Product Specifications for Recombinant Human EGF Protein, CF
E. coli-derived human EGF protein Asn971-Arg1023, with an N-terminal Met
>97%, by SDS-PAGE visualized with Silver Staining and quantitative densitometry by Coomassie® Blue Staining.
<0.10 EU per 1 μg of the protein by the LAL method.
N-terminal sequence Analysis
Predicted Molecular Mass
Measured in a cell proliferation assay using Balb/3T3 mouse embryonic fibroblast cells. Rubin, J.S. et al. (1991) Proc. Natl. Acad. Sci. USA 88:415. The ED50 for this effect is 20-100 pg/mL.
Scientific Data Examples for Recombinant Human EGF Protein, CF
Recombinant Human EGF Protein Bioactivity
Recombinant Human EGF (Catalog # 236‑EG) stimulates cell proliferation of the Balb/3T3 mouse embryonic fibroblast cell line. The ED50 for this effect is 20‑100 pg/mL.
Recombinant Human EGF Protein SDS-PAGE
1 µg/lane of Recombinant Human EGF was resolved with SDS-PAGE and visualized by silver staining under reducing (R) conditions, showing a single band at 6 kDa.
iPSC-derived Human Intestinal Organoids Cultured using Recombinant Human EGF Protein.
iPSC-derived human intestinal organoids were cultured using Cultrex™ UltiMatrix RGF Basement Membrane Extract (BME001-05) and intestinal organoid culture medium, which includes Recombinant Human EGF (Catalog # 236-EG), Recombinant Human Noggin (6057-NG), Recombinant Human R-Spondin 1 (4645-RS), and Recombinant Human Wnt-3a (5036-WN), along with the other reagents listed in the intestinal organoid culture medium recipe in the human intestinal organoid culture protocol. (A) Human intestinal organoids were stained using a Rat Anti-Human/Mouse/Rat Vimentin Monoclonal Antibody (MAB2105; green) and a Goat Anti-Human/Mouse Desmin Antigen Affinity-purified Polyclonal Antibody (AF3844; red) to visualize myofibroblast cells and counterstained with DAPI (5748; blue). (B) Human intestinal organoids were stained using a Goat Anti-Human/Mouse E-Cadherin Antigen Affinity-purified Polyclonal Antibody (AF748; green) and a Mouse Anti-Human MUC2 Monoclonal Antibody (Novus Biologicals, Catalog # NBP2-44431; red) and counterstained with DAPI (5748; blue).
Adult Stem Cell-derived Human Descending Colon Organoids Cultured using Recombinant Human EGF Protein.
Adult stem cells isolated from human descending colon were embedded in Cultrex UltiMatrix RGF Basement Membrane Extract (BME001-05) and cultured for 30 days in intestinal organoid culture medium, which includes Recombinant Human EGF (Catalog # 236-EG), Recombinant Human Noggin (6057-NG), Recombinant Human R-Spondin 1 (4645-RS), and Recombinant Human Wnt-3a (5036-WN), along with the other reagents listed in the intestinal organoid culture medium recipe in the human intestinal organoid culture protocol. (A) Organoids were fixed and stained with a Mouse Anti-Human MUC2 Monoclonal Antibody (Novus Biologicals; Catalog # NBP2-44431; green) to visualize intestinal goblet cells and counterstained with a Goat Anti-Human/Mouse E-Cadherin Antigen Affinity-purified Polyclonal Antibody (AF748; red) and DAPI (5748; blue). The image shown was taken at 10x magnification. (B) Organoids were fixed and stained with a Mouse Anti-Human Chromogranin A Monoclonal Antibody (MAB90981; green) to visualize enteroendocrine cells and counterstained with a Goat Anti-Human/Mouse E-Cadherin Antigen Affinity-purified Polyclonal Antibody (AF748; red) and DAPI (5748; blue). The image shown was taken at 20x magnification.
Formulation, Preparation and Storage
What does CF mean?
CF stands for Carrier Free (CF). We typically add Bovine Serum Albumin (BSA) as a carrier protein to our
Adding a carrier protein enhances protein stability, increases shelf-life, and allows the recombinant
protein to be stored at a more dilute concentration.
The carrier free version does not contain BSA.
What formulation is right for me?
In general, we advise purchasing the recombinant protein with BSA for use in cell or tissue culture, or
as an ELISA standard.
In contrast, the carrier free protein is recommended for applications, in which the presence of BSA
Lyophilized from a 0.2 μm filtered solution in PBS.
Reconstitute at 500 μg/mL in sterile PBS.
The product is shipped at ambient temperature. Upon receipt, store it immediately at the temperature recommended below.
Stability & Storage:
Use a manual defrost freezer and avoid repeated freeze-thaw cycles.
12 months from date of receipt, -20 to -70 °C as supplied.
1 month, 2 to 8 °C under sterile conditions after reconstitution.
3 months, -20 to -70 °C under sterile conditions after reconstitution.
Epidermal growth factor (EGF) is a small, potent growth factor capable of inducing cell proliferation, differentiation, and survival. EGF is the founding member of the EGF family that also includes TGF-alpha, amphiregulin (AR), betacellulin (BTC), epiregulin (EPR), heparin‑binding EGF‑like growth factor (HB‑EGF), epigen, and the neuregulins (NRG)-1 through -6 (1). Members of The EGF family are characterized by a shared structural motif, the EGF‑like domain, which contains three intramolecular disulfide bonds that are formed by six similarly spaced, conserved cysteine residues (2). These disulfide bonds are essential for proper protein conformation and receptor binding. All EGF family members are synthesized as type I transmembrane precursor proteins that may contain several EGF domains in the extracellular region. The mature proteins are released from the cell surface by regulated proteolysis (1). The full length EGF protein is 1207 amino acids (aa) (EGF precursor) containing nine EGF domains and nine LDLR class B repeats. However, the mature protein is much smaller, only 53 aa, and is generated by proteolytic cleavage of the EGF domain proximal to the transmembrane region (3). EGF is well conserved across mammals with mature human EGF 70% identical to mature mouse and rat EGF. Physiologically, EGF is found in various body fluids, including blood, milk, urine, saliva, seminal fluid, pancreatic juice, cerebrospinal fluid, and amniotic fluid (4). EGF is a high affinity ligand of the EGF receptor (ErbB). Four ErbB (HER) family receptor tyrosine kinases including EGFR/ErbB1, ErbB2, ErbB3 and ErbB4, mediate responses to EGF family members (5). EGF binding induces dimerization of the EGF receptor resulting in activation of the protein tyrosine kinase signaling pathway. These receptors undergo a complex pattern of ligand-induced homo- or hetero-dimerization to transduce EGF family signals (6, 7). EGF binds ErbB1 and depending on the context, induces the formation of homodimers or heterodimers containing ErbB2. Dimerization results in autophosphorylation of the receptor at specific tyrosine residues to create docking sites for a variety of signaling molecules (5, 8). Biological activities ascribed to EGF include epithelial development, angiogenesis, inhibition of gastric acid secretion, fibroblast proliferation, and colony formation of epidermal cells in culture.
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