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Mouse Monoclonal to CD25 / IL-2R alpha chain

MEM-140 (IgM)

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  11-299-C025 purified 0.025 mg yes choose region PDF datasheetHTML datasheet buy
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CD25 (IL2Ralpha, Tac) is a ligand-binding alpha subunit of interleukin 2 receptor (IL2R). Together with beta and gamma subunit CD25 constitues the high affinity IL2R, whereas CD25 alone serves as the low affinity IL2R. CD25 expression rapidly increases upon T cell activation. The 55 kDa CD25 molecule is enzymatically cleaved and shed from the cell surface as a soluble 45 kDa s-Tac, whose concentration in serum can be used as a marker of T cell activation. Expression of CD25 indicates the neoplastic phenotype of mast cells. Humanized anti CD25 antibodies represent a useful tool to reduce the incidence of allograft rejection as well as the severity of graft versus host reaction, and radioimmunoconjugates of anti-CD25 antibodies can be used against CD25 expressing lymphomas.


The antibody MEM-140 reacts with CD25 (Interleukin-2 receptor alpha chain), a 55 kDa type I transmembrane glycoprotein expressed on activated B and T lymphocytes, activated monocytes/macrophages and on CD4+ T lymphocytes (T regulatory cells); it is lost on resting B and T lymphocytes.
HLDA VI; WS Code C C-54

Regulatory Status


PHA-activated peripheral blood leucocytes

Species Reactivity:

  • Human

Negative Species:


  • Immunoprecipitation
    excellent for immunoisolation of CD25+cells
  • Flow Cytometry
    Recommended dilution:1 μg/ml
Usage note:
Indicated dilutions are recommended starting points for use of this product. Working concentrations should be determined by the investigator.

General references

  • *Lai KN, Leung JC, Lai FM: Soluble interleukin 2 receptor release, interleukin 2 production, and interleukin 2 receptor expression in activated T-lymphocytes in vitro. Pathology. 1991 Jul;23(3):224-8. [Abstract]
  • *Scheibenbogen C, Keilholz U, Richter M, Andreesen R, Hunstein W: The interleukin-2 receptor in human monocytes and macrophages: regulation of expression and release of the alpha and beta chains (p55 and p75). Res Immunol. 1992 Jan;143(1):33-7. [Abstract]
  • *Morris JC, Waldmann TA: Advances in interleukin 2 receptor targeted treatment. Ann Rheum Dis. 2000 Nov;59 Suppl 1:i109-14. [Abstract] [Full Text]
  • *Sotlar K, Horny HP, Simonitsch I, Krokowski M, Aichberger KJ, Mayerhofer M, Printz D, Fritsch G, Valent P: CD25 indicates the neoplastic phenotype of mast cells: a novel immunohistochemical marker for the diagnosis of systemic mastocytosis (SM) in routinely processed bone marrow biopsy specimens. Am J Surg Pathol. 2004 Oct;28(10):1319-25. [Abstract]
  • Product Specific References

  • *Leukocyte Typing VI., Kishimoto T. et al. (Eds.), Garland Publishing Inc. (1997).
  • For research use only. Not for drug, diagnostic or other use.

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