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JOURNAL ARTICLE
REVIEW
Apoptotic modifications affect the autoreactivity of the U1 snRNP autoantigen.
Autoimmunity Reviews 2005 July
A hallmark of systemic autoimmune diseases is the presence of high titers of serum autoantibodies targeting a diversity of autoantigens. Most components of the U1 snRNP complex are autoantigenic in systemic lupus erythematosus (SLE) and SLE overlap syndrome, which is also called mixed connective tissue disease (MCTD). It is hypothesized that posttranslational modifications, in particular cell death-associated modifications, play an important role in breaking tolerance to self-antigens. Recently, it became clear that the U1 snRNP particle, more specifically its U1-70K protein component, displays a new epitope during apoptosis. This review intends to give an overview of the modifications that occur on the U1 snRNP autoantigens, especially those arising during cell death, to summarize recent data describing autoantibody reactivities with apoptosis-specific epitopes on the U1 snRNP complex, and to provide some insight into the mechanisms that might underlie the immune response to self-antigens.
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