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Mouse Monoclonal to CD152 / CTLA4

BNI3 (IgG2a)

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CD152 / CTLA-4 is a homodimeric transmembrane protein similar to CD28 and binding the same ligands, i.e. CD80 (B7.1) and CD86 (B7.2), but with higher affinity. Unlike CD28 with important costimulating functions, CD152 acts as an important inhibitory receptor essential for modulation of the immune system. CD152 / CTLA-4 becomes transiently expressed on activated T cells and its malfunction can cause autoimmune diseases, such as insulin-dependent diabetes mellitus, Graves disease, Hashimoto thyroiditis, celiac disease, systemic lupus erythematosus, or thyroid-associated orbitopathy.


The mouse monoclonal antibody BNI3 recognizes human CD152 / CTLA4, an approximately 45 kDa type I transmembrane protein serving as a negative regulator of T cell responses.

Regulatory Status


Human CD152-IgG heavy chain fusion protein

Species Reactivity:

  • Human

Negative Species:


  • Flow Cytometry
    Application note: intracellular staining
  • Immunoprecipitation
  • Immunohistochemistry (frozen sections)
  • Immunocytochemistry
Usage note:
Indicated dilutions are recommended starting points for use of this product. Working concentrations should be determined by the investigator.

Product Specific References

  • *Kraszula L, Eusebio M, Kupczyk M, Kuna P, Pietruczuk M: The use of multi-color flow cytometry for identification of functional markers of nTregs in patients with severe asthma. Pneumonol Alergol Pol. 2012;80(5):389-401. [Abstract]
  • *Chin LT, Chu C, Chen HM, Hsu SC, Weng BC, Chu CH: Site-directed in vitro immunization leads to a complete human monoclonal IgG4 lambda that binds specifically to the CDR2 region of CTLA-4 (CD152) without interfering the engagement of natural ligands. BMC Biotechnol. 2007 Aug 23;7:51. [Abstract]
  • *Steiner K, Waase I, Rau T, Dietrich M, Fleischer B, Bröker BM: Enhanced expression of CTLA-4 (CD152) on CD4+ T cells in HIV infection. Clin Exp Immunol. 1999 Mar;115(3):451-7. [Abstract]
  • *Steiner K, Moosig F, Csernok E, Selleng K, Gross WL, Fleischer B, Bröker BM: Increased expression of CTLA-4 (CD152) by T and B lymphocytes in Wegener's granulomatosis. Clin Exp Immunol. 2001 Oct;126(1):143-50. [Abstract]
  • *Rissiek A, Baumann I, Cuapio A, Mautner A, Kolster M, Arck PC, Dodge-Khatami A, Mittrücker HW, Koch-Nolte F, Haag F, Tolosa E: The expression of CD39 on regulatory T cells is genetically driven and further upregulated at sites of inflammation. J Autoimmun. 2015 Apr;58:12-20. [Abstract]
  • For research use only. Not for drug, diagnostic or other use.

    Example Data

    BNI3 PE

    Fig. 1. Surface staining of PHA-activated (3 days) human PBMC with anti-human CD152 (BNI3) PE.

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