Natural killer cell receptor NKG2-D (NKG2D)

Natural killer cell receptor NKG2-D (NKG2D) is a type II transmembrane receptor predominantly expressed on natural killer (NK) cells and certain T lymphocyte subsets, including CD8+ T cells, γδ T cells, and NKT cells[1][3][5][6][8]. It is encoded by the KLRK1 gene and belongs to the C-type lectin-like family of immune receptors[1]. NKG2D functions as a potent activating and costimulatory receptor involved in the detection and elimination of stressed, transformed (tumor), or infected cells by recognizing a range of cellular stress-inducible ligands (notably MICA, MICB, and ULBP/RAET1 proteins)[1][3][6][8]. Upon ligand engagement, NKG2D triggers activation signals via adaptor protein DAP10 in humans (DAP10 and DAP12 in mouse isoforms), ultimately promoting immune cell cytotoxicity, cytokine production, and immune surveillance[1][2][3][5][6]. NKG2D is implicated in the pathogenesis and immune control of cancer, infections, autoimmune diseases, and transplant outcomes, making it a significant therapeutic and diagnostic target in immuno-oncology and immunotherapy research[3][5][6].

Other names

Natural killer group 2, member DKiller cell lectin-like receptor subfamily K, member 1KLRK1CD314

Blockade of ligand-receptor interaction (e.g., inhibiting recognition of NKG2D ligands); Augmentation of cytotoxicity by redirecting or stimulating NKG2D-expressing immune cells against tumors; Modulation of immune cell activation and signaling[6].