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Mouse Monoclonal to CD300a

MEM-260 (IgG1)

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CD300a (CMRF-35H, IRp60) is a non-MHC-specific inhibitory receptor of immunoglobulin superfamily, which contains three immunoreceptor tyrosine-based inhibitory motifs (ITIMs) that associate with SH2-containing phosphatases SHP-1 and SHP-2. CD300a is expressed on many cell types including T cells, NK cells, neutrophils, eosinophils or mast cells. Its triggering inhibits activating signals such as those of IL5, GM-CSF or eotaxin, as well as supresses mast cell degranulation or NK cell cytotoxic activity.


The antibody MEM-260 reacts with CD300a, a 60 kDa leukocyte transmembrane glycoprotein expressed on human granulocytes, monocytes, neutrophils, NK cells, mast cells and dendritic cells, 25% of circulating T cells and 15% of circulating B cells.

Regulatory Status


HPB human acute lymphoid leukemia cell line

Species Reactivity:

  • Human

Negative Species:


  • Flow Cytometry
    Recommended dilution:2 μg/ml
  • Western Blotting
    Positive material: HPB cell line
    Negative material: JURKAT human cell line, RAJI human cell line
    Sample preparation: Resuspend approx. 50 mil. cells in 1 ml cold Lysis buffer (1% laurylmaltoside in 20 mM Tris/Cl, 100 mM NaCl pH 8.2, 50 mM NaF including Protease inhibitor Cocktail). Incubate 60 min on ice. Centrifuge to remove cell debris. Mix lysate with non-reducing SDS-PAGE sample buffer.
    Application note: Non-reducing conditions.
Usage note:
Indicated dilutions are recommended starting points for use of this product. Working concentrations should be determined by the investigator.

General references

  • *Cantoni C, Bottino C, Augugliaro R, Morelli L, Marcenaro E, Castriconi R, Vitale M, Pende D, Sivori S, Millo R, Biassoni R, Moretta L, Moretta A: Molecular and functional characterization of IRp60, a member of the immunoglobulin superfamily that functions as an inhibitory receptor in human NK cells. Eur J Immunol. 1999 Oct;29(10):3148-59. [Abstract]
  • *Bachelet I, Munitz A, Moretta A, Moretta L, Levi-Schaffer F: The inhibitory receptor IRp60 (CD300a) is expressed and functional on human mast cells. J Immunol. 2005 Dec 15;175(12):7989-95. [Abstract] [Full Text]
  • *Bachelet I, Munitz A, Levi-Schaffer F: Abrogation of allergic reactions by a bispecific antibody fragment linking IgE to CD300a. J Allergy Clin Immunol. 2006 Jun;117(6):1314-20. [Abstract]
  • *Dimasi N, Roessle M, Moran O, Candiano G, Svergun DI, Biassoni R: Molecular analysis and solution structure from small-angle X-ray scattering of the human natural killer inhibitory receptor IRp60 (CD300a). Int J Biol Macromol. 2007 Feb 20;40(3):193-200. [Abstract]
  • *Alvarez Y, Tang X, Coligan JE, Borrego F: The CD300a (IRp60) inhibitory receptor is rapidly up-regulated on human neutrophils in response to inflammatory stimuli and modulates CD32a (FcgammaRIIa) mediated signaling. Mol Immunol. 2008 Jan;45(1):253-8. [Abstract]
  • Product Specific References

  • *Sabato V, Verweij MM, Bridts CH, Levi-Schaffer F, Gibbs BF, De Clerck LS, Schiavino D, Ebo DG: CD300a is expressed on human basophils and seems to inhibit IgE/FcεRI-dependent anaphylactic degranulation. Cytometry B Clin Cytom. 2012 May;82(3):132-8. [Abstract]
  • *Carnec X, Meertens L, Dejarnac O, Perera-Lecoin M, Hafirassou ML, Kitaura J, Ramdasi R, Schwartz O, Amara A: The Phosphatidylserine and Phosphatidylethanolamine Receptor CD300a Binds Dengue Virus and Enhances Infection. J Virol. 2015 Oct 14;90(1):92-102. [Abstract] [Full Text]
  • For research use only. Not for drug, diagnostic or other use.

    Related Products

  • Mouse IgG1 Isotype Control
  • Example Data


    Fig. 1. Surface staining of human peripheral blood cells with anti-CD300a (MEM-260) PE.

    MEM-260 FC

    Fig. 2. Surface staining of human peripheral blood cells with anti-CD300a (MEM-260) purified, GAM-APC.

    MEM-260 APC

    Fig. 3. Surface staining of human peripheral blood cells with anti-CD300a (MEM-260) APC.


    Fig. 4. Surface staining of human peripheral blood cells with anti-CD300a (MEM-260) Alexa Fluor® 488.

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