|Detection of NKG2D/CD314 in PBMCs gated on CD3- cells by Flow Cytometry. Peripheral blood mononuclear cells (PBMCs) gated on CD3- cells were stained with Mouse Anti-Human NCAM‑1/CD56 PE‑conjugated Monoclonal Antibody (Catalog # FAB2408P) and either (A) Mouse Anti-Human NKG2D/CD314 Alexa Fluor® 488‑conjugated Monoclonal Antibody (Catalog # FAB139G) or (B) Mouse IgG1 Alexa Fluor 488 Isotype Control (Catalog # IC002G). View our protocol for Staining Membrane-associated Proteins.|
NKG2D is a type II transmembrane glycoprotein having an extracellular lectin-like domain. This domain lacks the recognizable calcium-binding sites found in true C‑type lectins and binds protein rather than carbohydrate ligands. Human NKG2D is expressed on CD8+ alpha beta T cells, gamma δ T cells, NK cells, and NKT cells. In mouse systems NKG2D also occurs on macrophages. Human ligands for NKG2D include MICA, MICB, and ULBP1, 2, and 3. Expression of NKG2D ligands occurs in epithelial cells, tumor cells and under conditions of stress or infection. NKG2D exists as a disulfide-linked homodimer that delivers an activating signal upon ligand binding. Signaling requires association with an adapter protein. Alternative splicing of the NKG2D mRNA results in isoforms with different cytoplasmic domains that can associate either with DAP12 to deliver a true activating signal or with DAP10 resulting in a costimulatory signal. NKG2D has been implicated in anti-tumor surveillance and the immune response against viral infection.
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