G-CSF is secreted by monocytes, macrophages, and neutrophils after cell activation. It is also produced by stromal cells, fibroblasts, endothelial cells, epithelial carcinomas, acute myeloid leukemia cells, and various tumor cell lines. The synthesis of G-CSF can be induced by bacterial endotoxins, TNF, IL1 and GM-CSF. Comparison of the primary sequence of G-CSF with those of GM-CSF and M-CSF, shows that the three factors are not related to each other. Murine and human G-CSF share a sequence homology (protein) of approximately 70% and exhibit cross reactivity. G-CSF stimulates the proliferation and differentiation of hematopoietic progenitor cells committed to the neutrophils and granulocytes lineage in a dose-dependent manner. Expressed in human 293 cells, it is a monomeric glycoprotein with a molecular mass of 21 to 25 kDa.
<1 EU/µg of recombinant protein as determined by the LAL method
Biological Activity Comment
The EC(50) as determined by the dose-dependent stimulation of the proliferation of murine M-NFS-60 cells (Mouse Myeloid Leukemia indicator cell line) was found to be ≤ 0.1 ng/mL.
Weight
21 to 25 kDa, monomer,
Description
A quick spin of the vial followed by reconstitution in sterile 1xPBS containing 0.1% endotoxin-free recombinant human serum albumin (HSA).
Format
Lyophilized Powder1x PBS
Purity
>95% as determined by SDS-PAGE
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.