Interleukin-4 (IL-4) is a species-specific cytokine which promotes the proliferation, differentiation and cell-surface protein modulation of B lymphocytes. IL-4 is responsible for activities previously assigned to BCGF, BCDF, BSF-2 and TCGF-2. Mouse IL-4 is a 14 kD protein containing 120 amino acid residues.  Recombinant mouse IL-4 (Cat. No. 550067) is supplied as a frozen liquid comprised of 0.22 µm sterile-filtered aqueous buffered solution, glycerol and bovine serum albumin, with no preservatives.  Recombinant mouse IL-4 is ≥ 95% pure as determined by SDS-PAGE, and an absorbance assay based on the Beers-Lambert law.  The endotoxin level is ≤ 0.1 ng/µg of mouse IL-4, as measured in a chromogenic LAL assay.

(RUO)

200 µg/ml

ELISA Standard (Routinely Tested), Bioassay (Tested During Development)

Mouse (QC Testing)

IL-4

Frozen aqueous buffered solution containing BSA and glycerol.

Development References(5) 1. Grabstein K, Eisenman J, Mochizuki D, et al. Purification to homogeneity of B cell stimulating factor. A molecule that stimulates proliferation of multiple lymphokine-dependent cell lines. J Exp Med. 1986; 163(6):1405-1414. (Methodology). 2. Lee F, Yokota T, Otsuka T, et al. Isolation and characterization of a mouse interleukin cDNA clone that expresses B-cell stimulatory factor 1 activities and T-cell- and mast-cell-stimulating activities. Proc Natl Acad Sci U S A. 1986; 83(7):2061-2065. (Biology). 3. Noma Y, Sideras P, Naito T, et al.. Cloning of cDNA encoding the murine IgG1 induction factor by a novel strategy using SP6 promoter. Nature. 1986; 319(6055):640-646. (Biology). 4. Paul WE. Interleukin-4: a prototypic immunoregulatory lymphokine. Blood. 1991; 77(9):1859-1870. (Biology). 5. Prussin C, Metcalfe DD. Detection of intracytoplasmic cytokine using flow cytometry and directly conjugated anti-cytokine antibodies. J Immunol Methods. 1995; 188(1):117-128. (Methodology).