{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,3]],"date-time":"2026-06-03T19:45:01Z","timestamp":1780515901604,"version":"3.54.1"},"reference-count":60,"publisher":"Public Library of Science (PLoS)","issue":"1","license":[{"start":{"date-parts":[[2021,1,19]],"date-time":"2021-01-19T00:00:00Z","timestamp":1611014400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/publicdomain\/zero\/1.0\/"}],"funder":[{"DOI":"10.13039\/100000738","name":"U.S. Department of Veterans Affairs","doi-asserted-by":"publisher","award":["Merit Review"],"award-info":[{"award-number":["Merit Review"]}],"id":[{"id":"10.13039\/100000738","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/100005205","name":"Janssen Research and Development","doi-asserted-by":"publisher","id":[{"id":"10.13039\/100005205","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["www.plosone.org"],"crossmark-restriction":false},"short-container-title":["PLoS ONE"],"abstract":"<jats:p>While antibodies to citrullinated proteins have become a diagnostic hallmark in rheumatoid arthritis (RA), we still do not understand how the autoimmune T cell response is influenced by these citrullinated proteins. To investigate the role of citrullinated antigens in HLA-DR1- and DR4-restricted T cell responses, we utilized mouse models that express these MHC-II alleles to determine the relationship between citrullinated peptide affinity for these DR molecules and the ability of these peptides to induce a T cell response. Using a set of peptides from proteins thought to be targeted by the autoimmune T cell responses in RA, aggrecan, vimentin, fibrinogen, and type II collagen, we found that while citrullination can enhance the binding affinity for these DR alleles, it does not always do so, even when in the critical P4 position. Moreover, if peptide citrullination does enhance HLA-DR binding affinity, it does not necessarily predict the generation of a T cell response. Conversely, citrullinated peptides can stimulate T cells without changing the peptide binding affinity for HLA-DR1 or DR4. Furthermore, citrullination of an autoantigen, type II collagen, which enhances binding affinity to HLA-DR1 did not enhance the severity of autoimmune arthritis in HLA-DR1 transgenic mice. Additional analysis of clonal T cell populations stimulated by these peptides indicated cross recognition of citrullinated and wild type peptides can occur in some instances, while in others cases the citrullination generates a novel T cell epitope. Finally, cytokine profiles of the wild type and citrullinated peptide stimulated T cells unveiled a significant disconnect between proliferation and cytokine production. Altogether, these data demonstrate the lack of support for a simplified model with universal correlation between affinity for HLA-DR alleles, immunogenicity and arthritogenicity of citrullinated peptides. Additionally they highlight the complexity of both T cell receptor recognition of citrulline as well as its potential conformational effects on the peptide:HLA-DR complex as recognized by a self-reactive cell receptor.<\/jats:p>","DOI":"10.1371\/journal.pone.0245541","type":"journal-article","created":{"date-parts":[[2021,1,19]],"date-time":"2021-01-19T18:42:17Z","timestamp":1611081737000},"page":"e0245541","update-policy":"https:\/\/doi.org\/10.1371\/journal.pone.corrections_policy","source":"Crossref","is-referenced-by-count":21,"title":["The role of posttranslational modifications in generating neo-epitopes that bind to rheumatoid arthritis-associated HLA-DR alleles and promote autoimmune T cell responses"],"prefix":"10.1371","volume":"16","author":[{"given":"Stephane","family":"Becart","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Karen B.","family":"Whittington","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Amanda","family":"Prislovsky","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Navin L.","family":"Rao","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6225-5867","authenticated-orcid":true,"given":"Edward F.","family":"Rosloniec","sequence":"additional","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"340","published-online":{"date-parts":[[2021,1,19]]},"reference":[{"key":"pone.0245541.ref001","doi-asserted-by":"crossref","first-page":"113","DOI":"10.1111\/j.1600-065X.1983.tb00712.x","article-title":"The human immune response region (HLA-D) and disease susceptibility","volume":"70","author":"P Stastny","year":"1983","journal-title":"Immunol Rev"},{"issue":"4","key":"pone.0245541.ref002","doi-asserted-by":"crossref","first-page":"1063","DOI":"10.1002\/art.20989","article-title":"New classification of HLA-DRB1 alleles supports the shared epitope hypothesis of rheumatoid arthritis susceptibility","volume":"52","author":"ST du Montcel","year":"2005","journal-title":"Arthritis Rheum"},{"issue":"5","key":"pone.0245541.ref003","doi-asserted-by":"crossref","first-page":"1275","DOI":"10.1002\/art.23432","article-title":"The shared epitope hypothesis in rheumatoid arthritis: evaluation of alternative classification criteria in a large UK Caucasian cohort","volume":"58","author":"AW Morgan","year":"2008","journal-title":"Arthritis Rheum"},{"issue":"5\u20136","key":"pone.0245541.ref004","doi-asserted-by":"crossref","first-page":"401","DOI":"10.1016\/0923-2494(91)90038-K","article-title":"Crystallization of HLA-DR antigens.","volume":"142","author":"JC Gorga","year":"1991","journal-title":"Res Immunol"},{"issue":"4","key":"pone.0245541.ref005","doi-asserted-by":"crossref","first-page":"662","DOI":"10.1016\/j.semarthrit.2004.08.003","article-title":"Rheumatoid arthritis in American Indians and Alaska Natives: a review of the literature","volume":"34","author":"ED Ferucci","year":"2005","journal-title":"Semin Arthritis Rheum"},{"issue":"1","key":"pone.0245541.ref006","doi-asserted-by":"crossref","first-page":"15","DOI":"10.1002\/anr.1780320104","article-title":"HLA genes associated with rheumatoid arthritis. 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