• Product NameRecombinant Human Interleukin-13 (rHu IL-13)
• Brief DescriptionRecombinant Protein
• Host SpeciesE.coli
• Purification> 97 % by SDS-PAGE and HPLC analyses.
• Species ReactivityHu
• Biological ActivityFully biologically active when compared to standard. The ED50 as determined by a cell proliferation assay using human TF-1 cells is less than 1 ng ml, corresponding to a specific activity of > 1.0 ⅹ 106 IU mg.
• EndotoxinLess than 1 EU/μg of rHuIL-13 as determined by LAL method.
• Target NamerHu IL-13
• Accession No. accession:P35225
  GeneID:3596
• UniprotP35225
• Gene ID3596;
• Calculated MW Approximately 12.5 kDa, a sing
• SDS-PAGE MW Sterile Filtered White lyophil
• Target Sequence GPVPPSTALR ELIEELVNIT QNQKAPLCNG SMVWSINLTA GMYCAALESL INVSGCSAIE KTQRMLSGFC PHKVSAGQFS SLHVRDTKIE VAQFVKDLLL HLKKLFREGR FN
• Formulation Lyophilized from a 0.2 μm filtered concentrated solution in PBS, pH 7.4 with 5 % trehalose.
• Reconstitution We recommend that this vial be briefly centrifuged prior to opening to bring the contents to the bottom. Reconstitute in 20 mM HCl to a concentration of 0.1-1.0 mg ml. Stock solutions should be apportioned into working aliquots and stored at -20 ˚
• Storage This lyophilized preparation is stable at 2-8 ˚C, but should be kept at -20 ˚C for long term storage, preferably desiccated. Upon reconstitution, the preparation is stable for up to one week at 2-8 ˚C. For maximal stability, apportion the reconstituted preparation into working aliquots and store at -20 ˚C to -70 ˚C. Avoid repeated freeze thaw cycles.

Human Interleukin-13 (IL-13) is expressed by the IL13 gene located on the chromosome 5 and secreted by many cell types, especially T helper type 2 (Th2) cells. The high solution from of IL-13 reported to be a monomer with two internal disulfide bonds that contribute to a bundled four α-helix configuration. Targeted deletion of IL-13 in mice resulted in impaired Th2 cell development and indicated an important role for IL-13 in the expulsion of gastrointestinal parasites. IL-13 exerts anti-inflammatory effects on monocytes and macrophages and it inhibits the expression of inflammatory cytokines such as IL-1beta, TNF-alpha, IL-6 and IL-8. IL-13 has also been shown to enhance B cell proliferation and to induce isotype switching resulting in increased production of IgE. Human, mouse and rat IL-3 share low homology, but have cross species activity.

1. Schmutz J, Martin J, Terry A, et al. 2004. Nature, 431: 268-74. 2. Wynn TA. 2003. Annu Rev Immunol, 21: 425-56. 3. Moy FJ, Diblasio E, Wilhelm J, et al. 2001. J Mol Biol, 310: 219-30. 4. Lakkis FG, Cruet EN, Nassar GM, et al. 1997. Biochem Biophys Res Commun, 235: 529-32.

• Flow Cytometry (FCM) General Protocol
• Immunofluorescence(IC)
• Immunohistochemistry(Polymer)
• Western Blotting