Human IL-4 Recombinant Protein #74319
Product Information
Storage
Human IL-4 Recombinant Protein is supplied as lyophilized material that is very stable at -20°C. It is recommended to reconstitute with sterile water at a concentration of 0.1 mg/mL which can be further diluted in aqueous solutions as needed. Addition of a carrier protein (0.1% HSA or BSA) is recommended for long-term storage.
Once in solution, store at 4°C and use within 1 month, or store at -20ºC to -80ºC and use within 3 months to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles if storing reconstituted material at -20ºC to -80ºC.
Once in solution, store at 4°C and use within 1 month, or store at -20ºC to -80ºC and use within 3 months to prevent loss of potency. Aliquot to avoid multiple freeze/thaw cycles if storing reconstituted material at -20ºC to -80ºC.
Product Description
| MW (kDa) | 15.1 |
| Purity | A greater than or equal to 95% purity was determined by SDS-PAGE. |
| Endotoxin | Endotoxin levels are less than or equal to 1 EU / 1 μg hIL-4. |
| Activity | The bioactivity of recombinant hIL-4 was determined in a TF-1 cell proliferation assay. The ED50 of each lot is less than or equal to 0.25 ng/mL. |
Source / Purification
Recombinant human IL-4 was expressed in E. coli and is supplied in a lyophilized form.
Background
Interleukin-4 (IL-4) is a cytokine secreted by activated T cells, basophils, and mast cells (1,2). While it contributes to many immunomodulatory responses, it is mainly recognized as the cytokine responsible for eliciting differentiation of naive T cells into Th2 lineage cells that are defined by their secretion of IL-4, IL-5, and IL-10 (3). In addition, IL-4 contributes to immunoglobulin class switching by inducing the production of IgE from B cells (4,5). IL-4 acts through the IL-4 receptor, leading to tyrosine phosphorylation and activation of the Stat6 transcription factor (6).
- Yokota, T. et al. (1986) Proc Natl Acad Sci USA 83, 5894-8.
- Grabstein, K. et al. (1986) J Exp Med 163, 1405-14.
- Kopf, M. et al. (1993) Nature 362, 245-8.
- Kotowicz, K. and Callard, R.E. (1993) Eur J Immunol 23, 2250-6.
- Thyphronitis, G. et al. (1989) Proc Natl Acad Sci USA 86, 5580-4.
- Hou, J. et al. (1994) Science 265, 1701-6.
限制使用
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For Research Use Only. Not For Use In Diagnostic Procedures.
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