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Antigen Processing, Presentation, and Tolerance: Role in Autoimmune Skin Diseases

Journal

JOURNAL OF INVESTIGATIVE DERMATOLOGY
Volume 142, Issue 3 PT B, Pages 750-759

Publisher

ELSEVIER SCIENCE INC
DOI: 10.1016/j.jid.2021.05.009

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Funding

  1. Deutsche Forschungsgemeinschaft (DFG) [Pr241/5-2]

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Autoreactive T cells pose a constant risk for the emergence of autoimmune skin diseases. Multiple mechanisms contribute to the breakdown of immune tolerance and the development of the diseases.
Autoreactive T cells pose a constant risk for the emergence of autoimmune skin diseases in genetically predisposed individuals carrying certain HLA risk alleles. Immune tolerance mechanisms are opposed by broad HLA-presented self-immunopeptidomes, a predefined repertoire of polyspecific TCRs, the continuous generation of new antibody specificities by somatic recombination of Ig genes in B cells, and heightened proinflammatory reactivity. Increased autoantigen presentation by HLA molecules, cross-activation of pathogen-induced T cells against autologous structures, altered metabolism of self-proteins, and excessive production of proinflammatory signals may all contribute to the breakdown of immune tolerance and the development of autoimmune skin diseases.

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