| Catalog# |
C050 |
| Source |
E.coli |
| Description |
Recombinant Human Interleukin-4/IL-4 is produced with our E. coli expression system. The target protein is expressed with sequence (His25-Ser153) of Human IL-4. |
| Names |
Recombinant Human Interleukin-4, IL-4, B-Cell Stimulatory Factor 1, BSF-1, Binetrakin, Lymphocyte Stimulatory Factor 1, Pitrakinra, IL4 |
| Accession # |
P05112 |
| Formulation |
Lyophilized from a 0.2 μm filtered solution of 20mM PB, 150mM NaCl, pH 7.4 |
| Shipping |
The product is shipped at ambient temperature. |
| Reconstitution |
Always centrifuge tubes before opening. Do not mix by vortex or pipetting.
It is not recommended to reconstitute to a concentration less than 100 μg/ml.
Dissolve the lyophilized protein in 1X PBS.
Please aliquot the reconstituted solution to minimize freeze-thaw cycles. |
| Storage |
Lyophilized protein should be stored at < -20°C, though stable at room temperature for 3 weeks.
Reconstituted protein solution can be stored at 4-7°C for 2-7 days.
Aliquots of reconstituted samples are stable at < -20°C for 3 months. |
| Biological Activity |
ED50 is less than 2 ng/ml as determined by the dose-dependent stimulation of TF-1 cells.
Specific Activity of 5.0 x 106 IU/mg. |
| Purity |
Greater than 95% as determined by SEC-HPLC and reducing SDS-PAGE. |
| Endotoxin |
Less than 0.1 ng/μg (1 IEU/μg). |
| Amino Acid Sequence |
MHKCDITLQEIIKTLNSLTEQKTLCTELTVTDIFAASKNTTEKETFCRAATVLRQFYSHHEKDTR CLGATAQQFHRHKQLIRFLKRLDRNLWGLAGLNSCPVKEANQSTLENFLERLKTIMREKYSKCSS
|
| Background |
Recombinant Human Interleukin-4 (IL-4) is a pleiotropic cytokine that regulates diverse T and B cell responses including cell proliferation, survival and gene expression. IL-4 is produced by mast cells, T cells, and bone marrow stromal cells. IL-4 regulates the differentiation of naive CD4+ T cells into helper Th2 cells, characterized by their cytokine-secretion profile that includes secretion of IL-4, IL-5, IL-6, IL-10, and IL-13, which favor a humoral immune response. Another dominant function of IL-4 is the regulation of immunoglobulin class switching to the IgG1 and IgE isotypes. Excessive IL-4 production by Th2 cells has been associated with elevated IgE production and allergic response. |
