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Critical Reviews™ in Immunology

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ISSN Druckformat: 1040-8401

ISSN Online: 2162-6472

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 1.3 To calculate the five year Impact Factor, citations are counted in 2017 to the previous five years and divided by the source items published in the previous five years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) 5-Year IF: 2.6 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00079 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.24 SJR: 0.429 SNIP: 0.287 CiteScore™:: 2.7 H-Index: 81

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Human TCR as Antigen: Homologies and Potentially Cross-Reactive HLA-DR2-Restricted Epitopes Within the AV and BV CDR2 Loops

Volumen 20, Ausgabe 1, 2000, 28 pages
DOI: 10.1615/CritRevImmunol.v20.i1.30
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ABSTRAKT

The major function of the T-cell receptor is to confer antigen specificity to T cells. However, nascent TCR proteins that are not assembled into functional heterodimers may be processed and displayed with self MHC molecules on the T-cell surface, and are thought to be the genesis of autoregulatory T cells that can limit inflammatory responses through T-T network interactions. In previous work, we and others have exploited this natural regulatory system using TCR peptides to amplify regulatory T cells that potentially can treat human autoimmune diseases such as multiple sclerosis (MS) and arthritis. The development of this approach is limited by the diversity of human TCR V gene sequences, and by lack of knowledge of exactly which regions of the V gene proteins are immunogenic in association with various MHC alleles. To identify similar amino acid sequences within and among human V gene families that might have immunologic cross reactivity, we aligned 74 known AV and 109 known BV protein sequences into homologous groups using the ClustalX program. Moreover, with a focus on CDR2 peptides that have previously been used to induce regulatory T cells in clinical trials, we established homologous peptide groups, and then identified the optimal amino acid motifs for binding to two alleles, HLA-DRB1*1501 and DRB5*0101, that have been associated with susceptibility to MS. From this analysis, > 75% of AV and BV CDR2 sequences were predicted to bind with at least moderate avidity to each of the DR2 alleles, thus enhancing the likelihood that they could be antigenic. Further ordering of putative TCR contact residues revealed a different set of homology groupings, including many intrafamily sequence matches and some interfamily matches that might allow immunological cross reactivity. Particularly striking were DRB1*1501 -restricted IH-S and IY-S motifs shared by BV11, BV12, and BV13 and BV3, BV12, BV13, and BV17 family members, respectively, and DRB5*0101-restricted RL-H and RL-Y motifs shared by BV11, BV12, and BV13 and BV13 and BV17 family members, respectively. This analysis may be useful in designing an array of clinically useful homologous peptides with optimal MHC binding properties and highly cross-reactive TCR binding motifs.

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