SRP4166 Sigma-Aldrich

IL-13 from rat

recombinant, expressed in E. coli, ≥95% (SDS-PAGE), ≥95% (HPLC)

Synonym: ALRH, BHR1, IL-13, NC300, P600, interleukin 13



Related Categories Cancer Research, Cell Biology, Cell Culture, Cell Signaling and Neuroscience, Cytokines & Growth Factors,
biological source   rat
recombinant   expressed in E. coli
assay   ≥95% (HPLC)
  ≥95% (SDS-PAGE)
form   lyophilized
mol wt   ~12.7 kDa
packaging   pkg of 10 μg
storage condition   avoid repeated freeze/thaw cycles
impurities   endotoxin, tested
NCBI accession no.   P42203
UniProt accession no.   P42203
shipped in   wet ice
storage temp.   −20°C
Gene Information   rat ... Il13(116553)


General description

IL13 (interleukin 13) is a classic cytokine produced by Th2 (T-helper) cells. It was originally identified as an inflammatory cytokine production-inhibiting T-cell derived cytokine. Recombinant rat IL-13 is an 11.9 kDa protein containing 109 amino acid residues.

Biochem/physiol Actions

IL13 (interleukin 13) is up-regulated during parasitic infections, and participates in host’s protective immunity against Schistosoma japonicum. This protein promotes eosinophil activation resulting in elevated specific IgE against adult and larval antigens. During acute infection it promotes egg expulsion through increased intestinal contractility. It acts as a liver protective agent where it promotes formation of liver granulomas in a CD4+ T cell-mediated manner, which results in liver fibrosis. In airway disorders, such as asthma, chronic obstructive pulmonary disease (COPD), and cystic fibrosis lung disease, IL13 promotes the formation of airway goblet cells, resulting in excess mucus secretion, which in turn, is regulated by IL13-activated autophagy.

Physical form

Sterile filtered and lyophilized with no additives.


Centrifuge the vial prior to opening. Avoid freeze-thaw cycles.

Reconstitute in water to a concentration of 0.1-1.0 mg/mL. The solution can be diluted into other aqueous buffers.

Safety & Documentation

Safety Information

NONH for all modes of transport
WGK Germany 


Certificate of Analysis


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