PMID- 15797513 OWN - NLM STAT- MEDLINE DCOM- 20050613 LR - 20220408 IS - 1471-4906 (Print) IS - 1471-4906 (Linking) VI - 26 IP - 4 DP - 2005 Apr TI - Cellular ligands of activating NK receptors. PG - 221-6 AB - Human natural killer (NK) cells are equipped with a series of surface receptors that recognise different cellular ligands on potential target cells. Some of these ligands [e.g. human leukocyte antigen (HLA) class I] prevent an NK-mediated attack by interacting with inhibitory NK receptors (e.g. killer Ig-like receptors). Other ligands interact with activating NK receptors that, once engaged, induce both cytotoxicity and lymphokine release. Tumour transformation (or viral infection) frequently results in downregulation of surface HLA class I molecules together with upregulation or de novo expression of ligands of triggering NK receptors. Thus, transformed cells can become highly susceptible to NK-mediated lysis. However, although NK cells use different means to identify and fight target cells, target cells have various strategies to hide themselves, and disarm or even confuse the immune system. FAU - Bottino, Cristina AU - Bottino C AD - Istituto Giannina Gaslini, Largo G. Gaslini 5, 16147 Genova, Italy. Cristina.Bottino@unige.it FAU - Castriconi, Roberta AU - Castriconi R FAU - Moretta, Lorenzo AU - Moretta L FAU - Moretta, Alessandro AU - Moretta A LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review PL - England TA - Trends Immunol JT - Trends in immunology JID - 100966032 RN - 0 (Antigens, Differentiation, T-Lymphocyte) RN - 0 (CD226 antigen) RN - 0 (Histocompatibility Antigens Class I) RN - 0 (Ligands) RN - 0 (Receptors, Immunologic) RN - 0 (Receptors, Natural Killer Cell) SB - IM MH - Antigens, Differentiation, T-Lymphocyte/metabolism MH - Histocompatibility Antigens Class I/metabolism MH - Humans MH - Killer Cells, Natural/*immunology MH - Ligands MH - Models, Immunological MH - Neoplasms/immunology MH - Receptors, Immunologic/*metabolism MH - Receptors, Natural Killer Cell RF - 73 EDAT- 2005/03/31 09:00 MHDA- 2005/06/14 09:00 CRDT- 2005/03/31 09:00 PHST- 2005/03/31 09:00 [pubmed] PHST- 2005/06/14 09:00 [medline] PHST- 2005/03/31 09:00 [entrez] AID - S1471-4906(05)00046-3 [pii] AID - 10.1016/j.it.2005.02.007 [doi] PST - ppublish SO - Trends Immunol. 2005 Apr;26(4):221-6. doi: 10.1016/j.it.2005.02.007.