PMID- 29760713 OWN - NLM STAT- MEDLINE DCOM- 20190703 LR - 20190703 IS - 1664-3224 (Print) IS - 1664-3224 (Electronic) IS - 1664-3224 (Linking) VI - 9 DP - 2018 TI - Human Leukocyte Antigen-Class I Alleles and the Autoreactive T Cell Response in Psoriasis Pathogenesis. PG - 954 LID - 10.3389/fimmu.2018.00954 [doi] LID - 954 AB - Psoriasis is a complex immune-mediated inflammatory skin disease characterized by T-cell-driven epidermal hyperplasia. It occurs on a strong genetic predisposition. The human leukocyte antigen (HLA)-class I allele HLA-C*06:02 on psoriasis susceptibility locus 1 (PSORS1 on 6p21.3) is the main psoriasis risk gene. Other HLA-class I alleles encoding HLA molecules presenting overlapping peptide repertoires show associations with psoriasis as well. Outside the major histocompatibility complex region, genome-wide association studies identified more than 60 psoriasis-associated common gene variants exerting only modest individual effects. They mainly refer to innate immune activation and the interleukin-23/T(h/c)17 pathway. Given their strong risk association, explaining the role of the HLA-risk alleles is essential for elucidating psoriasis pathogenesis. Psoriasis lesions develop upon epidermal infiltration, activation, and expansion of CD8(+) T cells. The unbiased analysis of a paradigmatic Valpha3S1/Vbeta13S1-T-cell receptor from a pathogenic epidermal CD8(+) T-cell clone of an HLA-C*06:02(+) psoriasis patient had revealed that HLA-C*06:02 directs an autoimmune response against melanocytes through autoantigen presentation, and it identified a peptide form ADAMTS-like protein 5 as an HLA-C*06:02-presented melanocyte autoantigen. These data demonstrate that psoriasis is an autoimmune disease, where the predisposing HLA-class I alleles promote organ-specific inflammation through facilitating a T-cell response against a particular skin-specific cell population. This review discusses the role of HLA-class I alleles in the pathogenic psoriatic T-cell immune response. It concludes that as a principle of T-cell driven HLA-associated inflammatory diseases proinflammatory traits promote autoimmunity in the context of certain HLA molecules that present particular autoantigens. FAU - Prinz, Jorg Christoph AU - Prinz JC AD - Department of Dermatology, University Clinics, Ludwig-Maximilian-University of Munich, Munich, Germany. LA - eng PT - Journal Article PT - Research Support, Non-U.S. Gov't PT - Review DEP - 20180430 PL - Switzerland TA - Front Immunol JT - Frontiers in immunology JID - 101560960 RN - 0 (Autoantigens) RN - 0 (Histocompatibility Antigens Class I) SB - IM MH - Alleles MH - Autoantigens/immunology MH - *Autoimmunity MH - CD8-Positive T-Lymphocytes/*immunology MH - Epidermis/immunology MH - Genetic Predisposition to Disease MH - Histocompatibility Antigens Class I/*genetics MH - Humans MH - Melanocytes/immunology MH - Psoriasis/*genetics/*pathology MH - Skin/immunology/pathology PMC - PMC5936982 OTO - NOTNLM OT - HLA-C*06:02 OT - T-cell receptor OT - autoantigens OT - autoimmunity OT - autoreactive T cells OT - human leukocyte antigen association OT - pathogenesis OT - psoriasis EDAT- 2018/05/16 06:00 MHDA- 2018/05/16 06:01 PMCR- 2018/01/01 CRDT- 2018/05/16 06:00 PHST- 2018/02/26 00:00 [received] PHST- 2018/04/17 00:00 [accepted] PHST- 2018/05/16 06:00 [entrez] PHST- 2018/05/16 06:00 [pubmed] PHST- 2018/05/16 06:01 [medline] PHST- 2018/01/01 00:00 [pmc-release] AID - 10.3389/fimmu.2018.00954 [doi] PST - epublish SO - Front Immunol. 2018 Apr 30;9:954. doi: 10.3389/fimmu.2018.00954. eCollection 2018.