Cell Signaling Technology

Product Pathways - Growth Factors/Cytokines

Mouse Interleukin-13 (mIL-13) #5242

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Source

Recombinant mouse IL-13 (mIL-13) Ser26-Phe131 (Accession #NP_032381) was expressed in human 293 cells at Cell Signaling Technology.

Molecular Characterization

Recombinant mIL-13 contains no "tags" and the nonglycosylated protein has a calculated MW of 11,677. DTT-reduced and non-reduced protein migrate as 12-20 kDa polypeptides. Lower mobility and heterogeneity in SDS-PAGE are due to glycosylation. The expected amino-terminal SVSLP of recombinant mIL-13 was verified by amino acid sequencing.

Purity

>98% as determined by SDS-PAGE of 6 μg reduced (+) and non-reduced (-) recombinant mIL-13. All lots are greater than 98% pure.

Bioactivity

The bioactivity of recombinant mIL-13 was determined in a B9 cell proliferation assay. The ED50 of each lot is between 0.8 - 4 ng/ml.

Coomassie Gel

Coomassie Gel

The purity of recombinant mIL-13 was determined by SDS-PAGE of 6 µg reduced (+) and non-reduced (-) recombinant mIL-13 and staining overnight with Coomassie Blue.

Bioactivity

Bioactivity

The proliferation of B9 cells treated with increasing concentrations of mIL-13 was assessed. After 48 hour treatment with mIL-13, cells were incubated with a tetrazolium salt and the OD450 - OD650 was determined.

Western Blotting

Western Blotting

Western blot analysis of extracts from TF-1 cells untreated or treated with mIL-13 for 10 minutes, using Phospho-Stat6 (Tyr641) (C11A12) Rabbit mAb Antibody #9364 (upper) and Stat6 Antibody #9362 (lower).


Endotoxin

Less than 0.01 ng endotoxin/1μg mIL-13.

Formulation

With carrier: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2 containing 20 μg BSA per 1 μg mIL-13. Carrier free: Lyophilized from a 0.22 μm filtered solution of PBS, pH 7.2.

Background

IL-13 is produced by T cells and is important in the TH2 response. IL-13 targets include B cells, eosinophils, fibroblasts, mast cells and macrophages (1-3). IL-13 binds specifically to IL-13Rα1 that complexes with IL-4Rα to form the Type II IL-4R. Jak1 and Tyk2 are activated and signal through Stat3 and Stat6 (4). IL-13Rα2 is a different gene product, lacks the intracellular domain, does not complex with IL-4Rα and does not signal (1,4,5). The extracellular domain of IL-13Rα2 is often elevated in diseased states. IL-13 plays key roles in airway hyperresponsiveness (AHR) of allergic asthma (1,6,7) and modulates resistance to parasitic organisms (1).

  1. Wynn, T.A. (2003) Annu Rev Immunol 21, 425-56.
  2. Katz, Y. et al. (1995) Clin Exp Immunol 101, 150-6.
  3. McKenzie, A.N. et al. (1993) Proc Natl Acad Sci USA 90, 3735-9.
  4. Wills-Karp, M. and Finkelman, F.D. (2008) Sci Signal 1, pe55.
  5. Mentink-Kane, M.M. et al. (2004) Proc Natl Acad Sci U S A 101, 586-90.
  6. Wills-Karp, M. et al. (1998) Science 282, 2258-61.
  7. Nakajima, H. and Takatsu, K. (2007) Int Arch Allergy Immunol 142, 265-73.

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