Natural cytotoxicity trigger receptor 3 (NKp30) (NKp30)

Natural cytotoxicity trigger receptor 3 (NKp30), encoded by the NCR3 gene, is a pivotal activating receptor constitutively expressed on the surface of natural killer (NK) cells (UniProt P14770). It belongs to the immunoglobulin superfamily and plays a central role in the innate immune system's ability to recognize and destroy tumor-transformed and virally infected cells (PubMed 15039473). A key biochemical feature of NKp30 is its specific interaction with heparan sulfate (HS) proteoglycans and heparin-like structures on tumor cells, which act as functional ligands or co-receptors to facilitate NK cell docking and activation (PubMed 19380868). Beyond HS, NKp30 recognizes other ligands such as the tumor-associated protein B7-H6 and the nuclear protein BAG6 (BAT3). Upon ligand binding, NKp30 signals through association with ITAM-containing adapter proteins like CD3ζ and FcεRIγ, triggering degranulation and the release of pro-inflammatory cytokines (PubMed 21636664). In clinical oncology, the NKp30 pathway is often exploited by tumors through the shedding of soluble ligands or the expression of inhibitory splice variants, making it a significant target for immunotherapeutic interventions including monoclonal antibodies and CAR-NK cell therapies.

Other names

NCR3CD337Natural killer cell p30-related protein1C7LY117Activating natural killer receptor p30

Binding of NKp30 to its ligands, such as heparan sulfate or B7-H6, induces the phosphorylation of immunoreceptor tyrosine-based activation motifs (ITAMs) on associated adapter proteins (CD3ζ or FcεRIγ), which recruits Syk/ZAP-70 kinases to trigger NK cell degranulation and cytokine secretion.