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Biotin Rat Anti-Mouse CD23
Product Details
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BD Pharmingen™
FcεRII; Fc-epsilon-RII; Fcer2a; Ly-42; Low-affinity IgE receptor; Fcer2
Mouse (QC Testing)
Rat LOU, also known as Louvain, LOU/C, LOU/M IgG2a, κ
FcεR isolated from the mouse B hybridoma line O1.2B2
Flow cytometry (Routinely Tested)
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. The antibody was conjugated with biotin under optimum conditions, and unreacted biotin was removed. Store undiluted at 4°C and protected from prolonged exposure to light. Do not freeze.

Product Notices

  1. Since applications vary, each investigator should titrate the reagent to obtain optimal results.
  2. Please refer to for technical protocols.
  3. 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.
553137 Rev. 10
Antibody Details
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The B3B4 monoclonal antibody specifically binds to CD23, the low affinity IgE Fc receptor (FcεRII) expressed on mature resting conventional B lymphocytes, but not on B-1 cells (CD5+ B cells) or T lymphocytes. It does not react with high-affinity IgE receptors, as demonstrated on mouse mast cell lines. The regulation of CD23 surface expression on activated B cells appears to be complex, depending upon the mode of activation and the presence of cytokines. IgE synthesis is negatively regulated by CD23, and CD23 expression is upregulated on splenocytes in the presence of IgE. CD23 is also upregulated on follicular dendritic cells in the lymph nodes of immunized mice, and a subset of splenic dendritic cells expresses CD23. The B3B4 antibody abrogates antigen-specific IgE-dependent modulation of immune responses in normal mice. This monoclonal antibody also blocks IgE binding and eosinophil infiltration in the lung of immunized mice. Different in vivo results have been obtained when using the intact B3B4 antibody or the F(ab')2 fragments. B3B4 mAb does not cross-react with rat or human IgE Fc Receptor.

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.

553137 Rev. 10
Format Details
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Biotin is a ubiquitous co-factor (also known as Vitamin B7) that has many properties that make it extremely useful for molecular biology. Biotin has an extremely high affinity for the Avidin family of proteins (Kd = 10-15 M), making it the perfect tool to link two molecules. Biotin labeled antibodies can be combined with any number of Avidin-conjugated probes in order to customize an assay to a particular need. This is especially useful in the case of magnetic cell separation using streptavidin/magnetic bead conjugates, or in the case of flow cytometry using streptavidin/fluorophore conjugates.
553137 Rev.10
Citations & References
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View product citations for antibody "553137" on CiteAb

Development References (14)

  1. Conrad DH, Waldschmidt TJ, Lee WT, et al. Effect of B cell stimulatory factor-1 (interleukin 4) on Fc epsilon and Fc gamma receptor expression on murine B lymphocytes and B cell lines. J Immunol. 1987; 139(7):2290-2296. (Biology). View Reference
  2. Coyle AJ, Wagner K, Bertrand C, Tsuyuki S, Bews J, Heusser C. Central role of immunoglobulin (Ig) E in the induction of lung eosinophil infiltration and T helper 2 cell cytokine production: inhibition by a non-anaphylactogenic anti-IgE antibody. J Exp Med. 1996; 183(4):1303-1310. (Clone-specific: Mediation). View Reference
  3. Dasic G, Juillard P, Graber P, et al. Critical role of CD23 in allergen-induced bronchoconstriction in a murine model of allergic asthma. Eur J Immunol. 1999; 29(9):2957-2967. (Clone-specific: In vivo exacerbation). View Reference
  4. Kisselgof AB, Oettgen HC. The expression of murine B cell CD23, in vivo, is regulated by its ligand, IgE. Int Immunol. 1998; 10(9):1377-1384. (Biology). View Reference
  5. Maeda K, Burton GF, Padgett DA, et al. Murine follicular dendritic cells and low affinity Fc receptors for IgE (Fc epsilon RII). J Immunol. 1992; 148(8):2340-2347. (Biology). View Reference
  6. Oshiba A, Hamelmann E, Haczku A, et al. Modulation of antigen-induced B and T cell responses by antigen-specific IgE antibodies. J Immunol. 1997; 159(8):4056-4063. (Clone-specific: Functional assay). View Reference
  7. Pulendran B, Lingappa J, Kennedy MK, et al. Developmental pathways of dendritic cells in vivo: distinct function, phenotype, and localization of dendritic cell subsets in FLT3 ligand-treated mice. J Immunol. 1997; 159(5):2222-2231. (Biology). View Reference
  8. Rabin E, Cong YZ, Wortis HH. Loss of CD23 is a consequence of B-cell activation. Implications for the analysis of B-cell lineages. Ann N Y Acad Sci. 1992; 651:130-142. (Biology). View Reference
  9. Rao M, Lee WT, Conrad DH. Characterization of a monoclonal antibody directed against the murine B lymphocyte receptor for IgE. J Immunol. 1987; 138(6):1845-1851. (Immunogen: Blocking). View Reference
  10. Stief A, Texido G, Sansig G, et al. Mice deficient in CD23 reveal its modulatory role in IgE production but no role in T and B cell development. J Immunol. 1994; 152(7):3378-3390. (Biology). View Reference
  11. Waldschmidt T, Snapp K, Foy T, Tygrett L, Carpenter C. B-cell subsets defined by the Fc epsilon R. Ann N Y Acad Sci. 1992; 651:84-98. (Biology). View Reference
  12. Waldschmidt TJ, Conrad DH, Lynch RG. Expression of B cell surface receptors. II. IL-4 can accelerate the developmental expression of the murine B cell IgE Fc receptor. J Immunol. 1989; 143(9):2820-2827. (Biology). View Reference
  13. Waldschmidt TJ, Conrad DH, Lynch RG. The expression of B cell surface receptors. I. The ontogeny and distribution of the murine B cell IgE Fc receptor. J Immunol. 1988; 140(7):2148-2154. (Biology). View Reference
  14. Yu P, Kosco-Vilbois M, Richards M, Kohler G, Lamers MC. Negative feedback regulation of IgE synthesis by murine CD23. Nature. 1994; 369(6483):753-756. (Biology). View Reference
View All (14) View Less
553137 Rev. 10

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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.