Induction of allergic and autoimmune reactions by drugs and other chemicals constitutes a major public health problem. Elucidation of the underlying mechanisms might help improve diagnostic tools and therapeutic approaches. Here, Peter Griem and colleagues focus on several aspects of neoantigen formation by xenobiotics: metabolism of xenobiotics into reactive, haptenic metabolites; polymorphisms of metabolizing enzymes; induction of costimulatory signals; and sensitization of T cells.
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