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Killer immunoglobulin-like receptors/human leukocyte antigen class-I, a crucial immune pathway in cancer
1Department of Medical Oncology, Shanghai Pulmonary Hospital, Tongji University Medical School Cancer Institute, Tongji University School of Medicine, Shanghai 200433, China.
Abstract:
Natural killer cells (NK cells) play a crucial role in tumor immunity. The function of the NK cells is regulated by various receptors expressed on the surface. Among them, the killer immunoglobulin-like receptor (KIR) is one of the most important. The ligand of KIR is major histocompatibility complex class-I (MHC class-I), which is also called human leukocyte antigen class-I (HLA class-I). The combination of HLA class-I and inhibitory KIRs could inhibit NK cells and induce autoimmune tolerance. Inhibitory KIRs were highly expressed on malignant tumor patients, which were related to poor prognosis. KIR/HLA class-I pathway affected the clinical outcomes of cancer through several mechanisms, and inhibitory KIRs could be an ideal target of immunotherapy strategy.
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