PMID- 20634877 OWN - NLM STAT- MEDLINE DCOM- 20101006 LR - 20231213 IS - 1110-7251 (Electronic) IS - 1110-7243 (Print) IS - 1110-7243 (Linking) VI - 2010 DP - 2010 TI - The emerging role of HLA-E-restricted CD8+ T lymphocytes in the adaptive immune response to pathogens and tumors. PG - 907092 LID - 10.1155/2010/907092 [doi] LID - 907092 AB - Human leukocyte antigen (HLA)-E is a nonclassical major histocompatibility complex (MHC) class I molecule of limited sequence variability that is expressed by most tissues albeit at low levels. HLA-E has been first described as the ligand of CD94/NKG2 receptors expressed mainly by natural killer (NK) cells, thus confining its role to the regulation of NK-cell function. However, recent evidences obtained by our and other groups indicate that HLA-E complexed with peptides can interact with alphabeta T-cell receptor (TCR) expressed on CD8(+) T cells. Although, HLA-E displays a selective preference for nonameric peptides, derived from the leader sequence of various HLA class I alleles, several reports indicate that it can present also "noncanonical" peptides derived from both stress-related and pathogen-associated proteins. Because HLA-E displays binding specificity for innate CD94/NKG2 receptors, as well as all the features of an antigen-presenting molecule, its role in both natural and acquired immune responses has recently been re-evaluated. FAU - Pietra, Gabriella AU - Pietra G AD - Dipartimento di Medicina Sperimentale and Centro di Eccellenza per le Ricerche Biomediche, Universita degli Studi di Genova, 16132 Genova, Italy. FAU - Romagnani, Chiara AU - Romagnani C FAU - Manzini, Claudia AU - Manzini C FAU - Moretta, Lorenzo AU - Moretta L FAU - Mingari, Maria Cristina AU - Mingari MC LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20100622 PL - United States TA - J Biomed Biotechnol JT - Journal of biomedicine & biotechnology JID - 101135740 RN - 0 (HLA Antigens) RN - 0 (Histocompatibility Antigens Class I) RN - 0 (Peptides) RN - 0 (Receptors, Antigen, T-Cell, alpha-beta) SB - IM MH - Adaptive Immunity/*immunology MH - CD8-Positive T-Lymphocytes/*immunology MH - HLA Antigens/*immunology MH - Histocompatibility Antigens Class I/*immunology MH - Humans MH - Mycobacterium Infections/*immunology MH - Neoplasms/*immunology MH - Peptides/immunology MH - Receptors, Antigen, T-Cell, alpha-beta/immunology MH - Virus Diseases/*immunology MH - HLA-E Antigens PMC - PMC2896910 EDAT- 2010/07/17 06:00 MHDA- 2010/10/07 06:00 PMCR- 2010/06/22 CRDT- 2010/07/17 06:00 PHST- 2010/01/14 00:00 [received] PHST- 2010/05/04 00:00 [accepted] PHST- 2010/07/17 06:00 [entrez] PHST- 2010/07/17 06:00 [pubmed] PHST- 2010/10/07 06:00 [medline] PHST- 2010/06/22 00:00 [pmc-release] AID - 10.1155/2010/907092 [doi] PST - ppublish SO - J Biomed Biotechnol. 2010;2010:907092. doi: 10.1155/2010/907092. Epub 2010 Jun 22.