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Mouse Monoclonal to CD160

BY55 (IgM)

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CD160 is a cell surface glycoprotein of immunoglobulin superfamily, which functions as a costimulatory receptor expressed mainly on cytotoxic cell populations and recognizing both classical and non-classical MHC class I molecules. It can form disulfide-linked multimers. Down-modulation of CD160 occurs as a consequence of its proteolytic cleavage and the released soluble form was found to impair the MHC-class I specific cytotoxicity of CD8+ T lymphocytes and NK cells. In contrast to GPI-anchored isoform with broader expression among CD160 positive cells, expression of the transmembrane isoform is restricted to NK cells and is activation-dependent.


The mouse monoclonal antibody BY55 recognizes CD160, a 27 kDa glycoprotein expressed on NK cells, NK-T cells, intestinal intraepithelial lymphocytes, TCR-gamma/delta T cells and a small population of TCR-alpha/beta T cells. The antibody detects both GPI-anchored and transmembrane form of CD160.

Regulatory Status


Human NK cell line YT2C2

Species Reactivity:

  • Human

Negative Species:


  • Flow Cytometry
  • Immunoprecipitation
Usage note:
Indicated dilutions are recommended starting points for use of this product. Working concentrations should be determined by the investigator.

Product Specific References

  • *Bensussan A, Gluckman E, el Marsafy S, Schiavon V, Mansur IG, Dausset J, Boumsell L, Carosella E: BY55 monoclonal antibody delineates within human cord blood and bone marrow lymphocytes distinct cell subsets mediating cytotoxic activity. Proc Natl Acad Sci U S A. 1994 Sep 13;91(19):9136-40. [Abstract] [Full Text]
  • *Giustiniani J, Bensussan A, Marie-Cardine A: Identification and characterization of a transmembrane isoform of CD160 (CD160-TM), a unique activating receptor selectively expressed upon human NK cell activation. J Immunol. 2009 Jan 1;182(1):63-71. [Abstract] [Full Text]
  • *Maïza H, Leca G, Mansur IG, Schiavon V, Boumsell L, Bensussan A: A novel 80-kD cell surface structure identifies human circulating lymphocytes with natural killer activity. J Exp Med. 1993 Sep 1;178(3):1121-6. [Abstract] [Full Text]
  • *Anumanthan A, Bensussan A, Boumsell L, Christ AD, Blumberg RS, Voss SD, Patel AT, Robertson MJ, Nadler LM, Freeman GJ: Cloning of BY55, a novel Ig superfamily member expressed on NK cells, CTL, and intestinal intraepithelial lymphocytes. J Immunol. 1998 Sep 15;161(6):2780-90. [Abstract] [Full Text]
  • *Merino J, Ramírez N, Moreno C, Toledo E, Fernández M, Sánchez-Ibarrola A: BY55/CD160 cannot be considered a cytotoxic marker in cytomegalovirus-specific human CD8(+) T cells. Clin Exp Immunol. 2007 Jul;149(1):87-96. [Abstract] [Full Text]
  • For research use only. Not for drug, diagnostic or other use.

    Example Data

    By55 PE

    Fig. 1. Surface staining of human peripheral blood cells with anti-CD160 (BY55) PE.

    by55 pur

    Fig. 2. Surface staining of human peripheral blood cells with anti-CD160 (BY55) purified / GAM-APC.

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