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Purified Rat Anti-Mouse CD25
Product Details
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BD Pharmingen™
IL-2 Receptor α chain, p55
Mouse (QC Testing)
Rat LEW, also known as Lewis IgM, κ
IL-2-dependent BALB/c mouse helper T-cell clone HT-2
Flow cytometry (Routinely Tested), Cytotoxicity, ELISA, Immunohistochemistry-frozen, Immunoprecipitation, Radioimmunoassay (Reported)
0.5 mg/ml
Aqueous buffered solution containing ≤0.09% sodium azide.

Preparation And Storage

The monoclonal antibody was purified from tissue culture supernatant or ascites by affinity chromatography. Store undiluted at 4°C.

Recommended Assay Procedures

For detection of low-density CD25 expression, we recommend the use of the PE conjugate of PC61 antibody (Cat. No. 553866) or the biotin conjugate of 7D4 antibody (Cat. No. 553069/553070) with a "bright" second-step reagent, such as Streptavidin-PE (Cat. No. 554061). For IHC, we recommend the use of biotinylated 7D4 mAb in our special formulation for immunohistochemistry, Cat. No. 550529.

Product Notices

  1. Since applications vary, each investigator should titrate the reagent to obtain optimal results.
  2. Please refer to for technical protocols.
  3. Use of these products to measure activation antigens expressed on mononuclear cell subsets for the purpose of monitoring immunoregulatory status can fall under one or more claims of the following patents: US Patent Nos. 5,445,939, 5,656,446, 5,843,689; European Patent No. 319,543; Canadian Patent No. 1,296,622; Australian Patent No. 615,880; and Japanese Patent No. 2,769,156.
  4. Caution: Sodium azide yields highly toxic hydrazoic acid under acidic conditions. Dilute azide compounds in running water before discarding to avoid accumulation of potentially explosive deposits in plumbing.
  5. Sodium azide is a reversible inhibitor of oxidative metabolism; therefore, antibody preparations containing this preservative agent must not be used in cell cultures nor injected into animals. Sodium azide may be removed by washing stained cells or plate-bound antibody or dialyzing soluble antibody in sodium azide-free buffer. Since endotoxin may also affect the results of functional studies, we recommend the NA/LE (No Azide/Low Endotoxin) antibody format, if available, for in vitro and in vivo use.
553068 Rev. 17
Antibody Details
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The 7D4 monoclonal antibody specifically binds to CD25, the low affinity IL-2 Receptor (IL-2Rα, p55) expressed on activated T and B lymphocytes from all mouse strains tested. IL-2Rα by itself is not a signaling receptor. However, it can combine with IL-2 Receptor β (CD122) and γ (CD132) chains to form high-affinity, signaling receptor complexes for IL-2. Resting T and B lymphocytes as well as resting and activated NK cells do not express IL-2Rα.  CD25 is transiently expressed at a low level during normal B-cell development in the bone marrow on the CD45R/B220low TdT- sIg- Pre-B/Pre-B-II and CD45R/B220low TdT- sIgM+ sIgD- immature B stages, but not on the CD45R/B220low TdT+ sIg- Pro-B/Pre-B-I stage nor on CD45R/B220high TdTsIgM+ sIgD+ mature B cells.  It is expressed at a higher level during a very early stage of T-cell development in fetal and adult thymus. Peripheral CD25+ CD4+ T lymphocytes, called regulatory T (Treg) cells, are involved in the maintenance of self-tolerance. It has also been reported that dendritic cells express CD25, which is recognized by mAb 7D4. The 3C7 antibody recognizes an epitope of CD25 which is distinct from those recognized by mAbs 7D4 and PC61, and it blocks binding of IL-2 to CD25.

This antibody is routinely tested by flow cytometric analysis. Other applications were tested at BD Biosciences Pharmingen during antibody development only or reported in the literature.

553068 Rev. 17
Format Details
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Tissue culture supernatant is purified by either protein A/G or affinity purification methods. Both methods yield antibody in solution that is free of most other soluble proteins, lipids, etc. This format provides pure antibody that is suitable for a number of downstream applications including: secondary labeling for flow cytometry or microscopy, ELISA, Western blot, etc.
553068 Rev.17
Citations & References
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Development References (16)

  1. Chen J, Ma A, Young F, Alt FW. IL-2 receptor alpha chain expression during early B lymphocyte differentiation. Int Immunol. 1994; 6(8):1265-1268. (Biology). View Reference
  2. Crowley M, Inaba K, Witmer-Pack M, Steinman RM. The cell surface of mouse dendritic cells: FACS analyses of dendritic cells from different tissues including thymus. Cell Immunol. 1989; 118(1):108-125. (Clone-specific: Cytotoxicity). View Reference
  3. Garni-Wagner BA, Witte PL, Tutt MM, et al. Natural killer cells in the thymus. Studies in mice with severe combined immune deficiency. J Immunol. 1990; 144(3):796-803. (Biology). View Reference
  4. Godfrey DI, Kennedy J, Mombaerts P, Tonegawa S, Zlotnik A. Onset of TCR-β gene rearrangement and role of TCR-β expression during CD3-CD4-CD8- thymocyte differentiation. J Immunol. 1994; 152(10):4783-4792. (Biology). View Reference
  5. Habu S, Okumura K, Diamantstein T, Shevach EM. Expression of interleukin 2 receptor on murine fetal thymocytes. Eur J Immunol. 1985; 15(5):456-460. (Clone-specific: Immunohistochemistry). View Reference
  6. Lorenzo F, Jaulin C, Vita N, et al. Structure-function study of the p55 subunit of murine IL-2 receptor by epitope mapping. J Immunol. 1991; 147(9):2970-2977. (Biology). View Reference
  7. Malek TR, Robb RJ, Shevach EM. Identification and initial characterization of a rat monoclonal antibody reactive with the murine interleukin 2 receptor-ligand complex. Proc Natl Acad Sci U S A. 1983; 80(18):5694-5698. (Immunogen: Flow cytometry, Immunoprecipitation, Inhibition). View Reference
  8. Malek TR, Schmidt JA, Shevach EM. The murine IL 2 receptor. III. Cellular requirements for the induction of IL 2 receptor expression on T cell subpopulations. J Immunol. 1985; 134(4):2405-2413. (Biology). View Reference
  9. Moreau JL, Nabholz M, Diamantstein T, Malek T, Shevach E, Theze J. Monoclonal antibodies identify three epitope clusters on the mouse p55 subunit of the interleukin 2 receptor: relationship to the interleukin 2-binding site. Eur J Immunol. 1987; 17(7):929-935. (Biology). View Reference
  10. Ortega G, Robb RJ, Shevach EM, Malek TR. The murine IL 2 receptor. I. Monoclonal antibodies that define distinct functional epitopes on activated T cells and react with activated B cells. J Immunol. 1984; 133(4):1970-1975. (Clone-specific: Immunoprecipitation, Inhibition). View Reference
  11. Osawa H, Josimovic-Alasevic O, Diamantstein T. Interleukin 2 receptors are released by cells in vitro and in vivo. I. Detection of soluble IL 2 receptors in cell culture supernatants and in the serum of mice by an immunoradiometric assay. Eur J Immunol. 1986; 16(4):467-469. (Clone-specific: Radioimmunoassay). View Reference
  12. Pollard AM, Lipscomb MF. Characterization of murine lung dendritic cells: similarities to Langerhans cells and thymic dendritic cells. J Exp Med. 1990; 172(1):159-167. (Clone-specific: Cytotoxicity). View Reference
  13. Read S, Malmstrom V, Powrie F. Cytotoxic T lymphocyte-associated antigen 4 plays an essential role in the function of CD25(+)CD4(+) regulatory cells that control intestinal inflammation. J Exp Med. 2000; 192(2):295-302. (Biology). View Reference
  14. Rolink A, Grawunder U, Winkler TH, Karasuyama H, Melchers F. IL-2 receptor alpha chain (CD25, TAC) expression defines a crucial stage in pre-B cell development. Int Immunol. 1994; 6(8):1257-1264. (Biology). View Reference
  15. Takahashi T, Tagami T, Yamazaki S, et al. Immunologic self-tolerance maintained by CD25(+)CD4(+) regulatory T cells constitutively expressing cytotoxic T lymphocyte-associated antigen 4. J Exp Med. 2000; 192(2):303-309. (Biology). View Reference
  16. Taniguchi T, Minami Y. The IL-2/IL-2 receptor system: a current overview. Cell. 1993; 73(1):5-8. (Biology). View Reference
View All (16) View Less
553068 Rev. 17

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Comparisons, where applicable, are made against older BD Technology, manual methods or are general performance claims.  Comparisons are not made against non-BD technologies, unless otherwise noted.

For Research Use Only. Not for use in diagnostic or therapeutic procedures.