* Suggested working dilutions are given as a guide only. It is recommended that the user titrates the product for use in their own experiment using appropriate negative and positive controls.
Product Specific Information
For dilution, use a buffer containing carrier protein, e.g. PBS with 1% BSA or a neutral media containing 10% FCS and freeze in aliquots at -70°C.
Activity: The biological activity of recombinant bovine IL-4 was determined by measuring the proliferation of the factor-dependent human T-helper cell line, TF-1 (Kitamura, T. et al. (1989) J. Cell Physiol. 140:323). The ED50 (or 1 unit of activity) for this effect in our laboratories typically falls into the range of 0.44 – 0.67 ng/ml.
Expression: Mature bovine IL-4 was expressed in Pichia pastoris, X-33. GenBank® Accession # P30367, amino acids 25 - 135. For protein verification, the expressed protein was N-terminal sequenced and begins with the following 10 amino acids: HKCDITLAEI.
Reconstitute with 0.5 ml of distilled water.
The protein encoded by this gene is a pleiotropic cytokine produced by activated T cells. This cytokine is a ligand for interleukin 4 receptor. The interleukin 4 receptor also binds to IL13, which may contribute to many overlapping functions of this cytokine and IL13. STAT6, a signal transducer and activator of transcription, has been shown to play a central role in mediating the immune regulatory signal of this cytokine. This gene, IL3, IL5, IL13, and CSF2 form a cytokine gene cluster on chromosome 5q, with this gene particularly close to IL13. This gene, IL13 and IL5 are found to be regulated coordinately by several long-range regulatory elements in an over 120 kilobase range on the chromosome. Two alternatively spliced transcript variants of this gene encoding distinct isoforms have been reported.
(This product is for In Vitro experimental use only. Not for resale without express authorization.)