Hypothetical review: thymic aberrations and type-I interferons; attempts to deduce autoimmunizing mechanisms from unexpected clues in monogenic and paraneoplastic syndromes.

Clinical and Experimental Immunology
A MeagerNick Willcox

Abstract

In sporadic autoimmune disorders, dendritic cells are increasingly being incriminated as agents provocateurs. However, the mechanisms and any 'danger signals' that induce them to autoimmunize remain enigmatic. Here, we focus on unexpected clues from two prototypic/ highly informative autoimmune syndromes, acquired thymoma-associated myasthenia gravis and the monogenic autoimmune polyendocrine syndrome type-1 (APS1), caused by mutations in the AutoImmune Regulator (AIRE). Both involve the thymus, and in both we find early, persistent, highly prevalent and high-titre neutralizing autoantibodies against type-I interferons, regardless of the exact AIRE genotype or the characteristically variable clinical phenotype in APS1. Thus these key innate<-->adaptive immune intermediaries are now implicated in APS1 and paraneoplastic myasthenia as well as in systemic lupus erythematosus and other sporadic autoimmune disorders. The currently accepted notion that autoimmunization proceeds automatically (by 'default') does not explain how, when or where autoimmune responses are initiated against which targets in APS1, or whether exogenous or internal danger signals are involved, or predict whether the primary auto-immunogenic targets are AIRE-de...Continue Reading

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