Granulocyte Colony Stimulating Factor, Recombinant, Human (G-CSF)
|Growth Factors, Cytokines||Storage: -20°CShipping: RT|
A glycoprotein of MW 20kD containing internal disulfide bonds. It induces the survival, proliferation, and differentiation of neutrophilic granulocyte precursor cells and functionally activates mature blood neutrophils. Among the family of colony-stimulating factors, G-CSF is the most potent inducer of terminal differentiation to granulocytes and macrophages of leukemic myeloid cell lines. The synthesis of G-CSF can be induced by bacterial endotoxins, TNF, Interleukin-1 and GM-CSF. Prostaglandin E2 inhibits the synthesis of G-CSF. In epithelial, endothelial, and fibroblastic cells secretion of G-CSF is induced by Interleukin-17.
Recombinant Human G-CSF is a single, non-glycosylated, polypeptide chain containing 175 amino acids and having a molecular mass of 18.8kD
The sequence of the first five N-terminal amino acids was determined and was found to be Met-Thr-Pro-Leu-Gly.
Dimers and Aggregates:
1% as determined by silver-stained SDS-PAGE gel analysis.
Protein quantitation was carried out by two independent methods:
1. UV spectroscopy at 280 nm using the absorbency value of 0.815 as the extinction coefficient for a 0.1% (1mg/ml) solution. This value is calculated by the PC GENE computer analysis program of protein sequences (IntelliGenetics).
2. Analysis by RP-HPLC, using a standard solution of recombinant G-CSF as a Reference Standard.
Recombinant Human Granulocyte-Colony Stimulating Factor is fully biologically active when compared to standard. The ED50, calculated by the dose-dependent proliferation of murine NFS-60 indicator cells (measured by 3H-thymidine uptake) is less then 0.1ng/ml, corresponding to a Specific Activity of 1x10e8 IU/mg.
Reconstitution: Reconstitute with sterile ddH2O, protein carrier to >100ug/ml.
Storage and Stability:
Lyophilized powder may be stored at 4°C for short-term only. Reconstitute to nominal volume by adding sterile dH2O and store at -20°C. Reconstituted product is stable for 12 months at -20°C. For maximum recovery of product, centrifuge the original vial prior to removing the cap. Further dilutions can be made in assay buffer.
Source: E. coli
Purity: 98% by RP-HPLC, FPLC, or reducing/non-reducing SDS-PAGE Silver Stain. Chromatographically purified.
Form: Supplied as a lyophilized powder in 10mM sodium acetate buffer, pH 4.
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.