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Alvarez-Navarro, Carlos; López de Castro, José A.
Molecular immunology, January 2014, 2014-Jan, 2014-01-00, 20140101, Letnik: 57, Številka: 1Journal Article
•ERAP1 is a multifunctional aminopeptidase involved in antigen processing.•It is associated with ankylosing spondylitis and other MHC-I-related diseases.•ERAP1 polymorphism has a significant influence on the HLA-B27 peptidome.•This influence is based on altering the epitope generation/destruction balance.•The pathogenetic role of ERAP1 might go beyond its influence on antigen processing. The endoplasmic reticulum aminopeptidase 1 (ERAP1) is a multifunctional enzyme involved in the final processing of Major Histocompatibility Complex class I (MHC-I) ligands and with a significant influence in the stability and immunological properties of MHC-I proteins. ERAP1 polymorphism is associated with ankylosing spondylitis among HLA-B27-positive individuals and the altered enzymatic activity of natural variants has significant effects on the HLA-B27 peptidome, suggesting a critical pathogenetic role of peptides in this disease. Likewise, the association of ERAP1 with other MHC-I associated disorders and its epistasis with their susceptibility MHC alleles point out to a general role of the MHC-I peptidome in these diseases. The functional interaction between ERAP1 and HLA-B27 or other MHC-I molecules may be related to the processing of specific epitopes, or to a more general peptide-dependent influence on other biological features of the MHC-I proteins. In addition, from a consideration of the reported functions of ERAP1, including its involvement in angiogenesis and macrophage activation, a more complex and multi-level influence in the inflammatory and immune pathways operating in these diseases cannot be ruled out.
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