Linked Life Data

17453712

Source:http://linkedlifedata.com/resource/pubmed/id/17453712

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pubmed-article:17453712pubmed:dateCreated2007-4-24lld:pubmed
pubmed-article:17453712pubmed:abstractTextThe development of immune tolerance is dependent on the expression of self-peptides in the thymus and bone marrow during lymphocyte development. However, not all self-antigens are expressed in the thymus, particularly for proteins that become post-translationally modified during other biological processes in a cell. We have found that one such post-translational modification, the spontaneous conversion of an aspartic acid to isoaspartic acid (isoAsp), causes ignored self-antigens to become immunogenic. In order to determine the mechanism for this autoimmune response, pigeon cytochrome c peptide 88-104 (PCC p88-104) was synthesized with and without an isoaspartyl residue. Each form was digested with cathepsin D, an enzyme involved in antigen processing. The products of cathepsin digestion were dramatically different between the two forms of self-protein suggesting that cryptic self-peptides may be revealed to the immune system by natural modifications to self-proteins. This observation also held true if whole PCC protein contained isoaspartyl residues was digested with cathespsin D. Additionally, AND transgenic TCR T cells (recognizing PCC 88-104) proliferated to a greater extent in response to isoaspartyl PCC as compared to the normal form of PCC. These finding demonstrate the importance of post-translational modifications in shaping autoimmune responses in and the development of tolerance to self-proteins.lld:pubmed
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pubmed-article:17453712pubmed:pagination131-7lld:pubmed
pubmed-article:17453712pubmed:dateRevised2007-12-3lld:pubmed
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pubmed-article:17453712pubmed:year2007lld:pubmed
pubmed-article:17453712pubmed:articleTitleAltered immunogenicity of isoaspartate containing proteins.lld:pubmed
pubmed-article:17453712pubmed:affiliationSection of Rheumatology, Department of Internal Medicine, Yale University School of Medicine, New Haven, CT 06520, USA.lld:pubmed
pubmed-article:17453712pubmed:publicationTypeJournal Articlelld:pubmed
pubmed-article:17453712pubmed:publicationTypeResearch Support, Non-U.S. Gov'tlld:pubmed
pubmed-article:17453712pubmed:publicationTypeResearch Support, N.I.H., Extramurallld:pubmed
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