Cat. #:101-05
Recombinant Human Interleukin-5
Technical Parameters
SynonymsB-cell differentiation factor I, Eosinophil differentiation factor, TRF
Source Escherichia coli.
Molecular Weight Approximately 26.5 kDa, a disulfide-linked homodimeric protein containing two 116 amino acids.
Quantity 2µg/10µg/1000µg
Purity > 98 % by SDS-PAGE and HPLC analyses.
Biological Activity Fully biologically active when compared to standard. The ED50 as determined by a cell proliferation assay using human TF-1 cells is less than 0.1 ng/ml, corresponding to a specific activity of > 1.0 × 107 IU/mg.
Physical Appearance Sterile Filtered White lyophilized (freeze-dried) powder.
Formulation Lyophilized from a 0.2 µm filtered concentrated solution in 20mM PB, pH 7.5, 3 % trehalose, 0.1 % Tween-80.
Endotoxin Less than 1 EU/µg of rHuIL-5 as determined by LAL method.
Reconstitution We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Reconstitute in sterile distilled water or aqueous buffer containing 0.1 % BSA to a concentration of 0.1-1.0 mg/mL. Stock solutions should be apportioned into working aliquots and stored at ≤ -20 °C. Further dilutions should be made in appropriate buffered solutions.
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.
Usage This material is offered by Shanghai PrimeGene Bio-Tech for research, laboratory or further evaluation purposes. NOT FOR HUMAN USE.
Reference1. MV Milburn, AM Hassell, MH Lambert, et al. 1993. Nature, 363: 172-6.
2. JS Lee, HD Campbell, CA Kozak, et al. 1989. Somat Cell Mol Genet, 15: 143-52.
3. BH van Leeuwen, ME Martinson, GC Webb, et al. 1989. Blood, 73: 1142-8.
4. S Dubucquoi, P Desreumaux, A Janin, et al. 1994. J Exp Med, 179: 703-8.
BackgroundThe IL-5 gene is located on chromosome 5 in humans, in close proximity to the genes encoding IL-3, IL-4, and granulocyte-macrophage colony-stimulating factor (GM-CSF), which are often co-expressed in TH2 cells. Through binding to the IL-5 receptor, IL-5 stimulates B cell growth and increases immunroglobulin secretion. It is also a key mediator in eosinophil activation. Interleukin-5 has long been associated with the cause of several allergic diseases including allergic rhinitis and asthma. IL-5 is a 115-amino acid (in human, 133 in the mouse) -long TH2 cytokine that is part of the hematopoietic family. Unlike other members of this cytokine family (namely IL-3 and GM-CSF), this glycoprotein in its active form is a homodimer.