The mouse monoclonal antibody 3G8 recognizes an extracellular epitope of CD16, a low affinity receptor for aggregated IgG (FcgammaRIII antigen). CD16 exists in two different isoforms: CD16a (FcgammaRIIIA, 50-65 kDa, expressed on NK-cells, monocytes and macrophages) and CD16b (FcgammaRIIIB, 48 kDa, mainly expressed on neutrophils). Regarding CD16-158V/F polymorphism, the antibody 3G8 detects both 158V and 158F allotype on natural NK cells.
Cross-Reactivity (Details)
Human, Non-Human Primates
Purification
Purified by protein-A affinity chromatography.
Purity
> 95 % (by SDS-PAGE)
Endotoxin Level
Endotoxin level is less than 0.01 EU/µg of the protein, as determined by the LAL test.
Functional application: In vitro stimulation of NK cell proliferation, blocking of IgG binding and phagocytosis, inhibition of cytotoxic activity, in vivo NK cell depletion. Flow cytometry: Recommended dilution: 6 μg/mL. Immunohistochemistry (frozen sections): Acetone fixation.
Restrictions
For Research Use only
Concentration
1 mg/mL
Buffer
Phosphate buffered saline (PBS), pH 7.4
Preservative
Azide free
Storage
4 °C
Storage Comment
Store at 2-8°C. Do not freeze.
Burt, Plitas, Zhao, Bamboat, Nguyen, Dupont, DeMatteo: "The lytic potential of human liver NK cells is restricted by their limited expression of inhibitory killer Ig-like receptors." in: Journal of immunology (Baltimore, Md. : 1950), Vol. 183, Issue 3, pp. 1789-96, (2009) (PubMed).
Choi, Wang, Peterson, Letvin, Reimann: "Use of an anti-CD16 antibody for in vivo depletion of natural killer cells in rhesus macaques." in: Immunology, Vol. 124, Issue 2, pp. 215-22, (2008) (PubMed).
Congy-Jolivet, Bolzec, Ternant, Ohresser, Watier, Thibault: "Fc gamma RIIIa expression is not increased on natural killer cells expressing the Fc gamma RIIIa-158V allotype." in: Cancer research, Vol. 68, Issue 4, pp. 976-80, (2008) (PubMed).
Komano, Nanki, Hayashida, Taniguchi, Miyasaka: "Identification of a human peripheral blood monocyte subset that differentiates into osteoclasts." in: Arthritis research & therapy, Vol. 8, Issue 5, pp. R152, (2007) (PubMed).
Wijngaarden, van Roon, van de Winkel, Bijlsma, Lafeber: "Down-regulation of activating Fcgamma receptors on monocytes of patients with rheumatoid arthritis upon methotrexate treatment." in: Rheumatology (Oxford, England), Vol. 44, Issue 6, pp. 729-34, (2005) (PubMed).
Metes, Ernst, Chambers, Sulica, Herberman, Morel: "Expression of functional CD32 molecules on human NK cells is determined by an allelic polymorphism of the FcgammaRIIC gene." in: Blood, Vol. 91, Issue 7, pp. 2369-80, (1998) (PubMed).
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Background
CD16 (FcgammaRIII) is a 50-65 kDa glycoprotein serving as a low affinity IgG receptor. Human FcgammaRIII is expressed in two forms –, FcgammaRIII-A and -B. FcgammaRIII-A is a transmembrane protein of monocytes, macrophages, NK cells and a subset of T cells. It is associated with FcepsilonRI-gamma subunit and is responsible for antibody-dependent NK cell cytotoxicity. Mast cell FcgammaRIII-A is associated, moreover, with FcepsilonRI-beta subunit. Besides IgG, FcgammaRIII-A can be triggered also by oligomeric IgE. FcgammaRIII-B is a GPI-linked monomeric receptor expressed on neutrophils and is involved in their activation and induction of a proadhesive phenotype.,FcgammaRIII, IGFR3, FCRIII