Journal
CANCER IMMUNOLOGY IMMUNOTHERAPY
Volume 72, Issue 4, Pages 797-804Publisher
SPRINGER
DOI: 10.1007/s00262-022-03299-x
Keywords
NK cell; HLA; KIR; NKG2A; ADCC; Immunotherapy; Cancer
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This review provides an overview of the impact of inhibitory KIR and NKG2A on NK cell-mediated ADCC response, emphasizing the rationale for combination strategies targeting inhibitory immune checkpoints and ADCC triggering antibodies.
Natural killer (NK) cells mediate potent anti-tumor responses, which makes them attractive targets for immunotherapy. The anti-tumor response of endogenous- or allogeneic NK cells can be enhanced through clinically available monoclonal antibodies that mediate antibody-dependent cellular cytotoxicity (ADCC). NK cell activation is regulated by interaction of inhibitory receptors with classical- and non-classical human leukocyte antigens (HLA) class I molecules. Inhibitory receptors of the killer immunoglobulin-like receptor (KIR) family interact with HLA-A, -B or -C epitopes, while NKG2A interacts with the non-classical HLA-E molecule. Both types of inhibitory interactions may influence the strength of the ADCC response. In the present review, we provide an overview of the effect of inhibitory KIRs and NKG2A on NK cell-mediated ADCC, which highlights the rationale for combination strategies with ADCC triggering antibodies and interference with the NK cell relevant inhibitory immune checkpoints, such as KIR and NKG2A.
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