Abstract
For almost a century self-nonself discrimination has been considered the driving force of the immune system and the dogma of self-tolerance (horror autotoxicus) the essential issue for understanding protective immunity and pathologic autoreactivity. This classical picture has been recently challenged by the discovery that the immune system is influenced by internal activation (amor autocognitus) and autoreactive clones are both present and activated in healthy individuals. Central to the concepts of reactivity and tolerance, in other terms, to physiology and pathology, is the analysis of structures involved in immunorecognition and as they contribute to the outcome of the immune response. The capacity of the immune system to recognize nonself structures and eventually react to them developed during evolution probably before the generation of clonally distributed antigen receptors. The high level of autoreactivity that characterizes the immune system seems to suggest that immunocompetent cells never learned to ignore the self, but rather that, sometime during evolution, they specialized in the function of self-identification, one of the most basic activities of all living cells. Autoimmune diseases would result from a pathologic deviation of a physiologic function, just as many other diseases do.
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del Guercio, P. The self and the nonself: Immunorecognition and immunologic functions. Immunol Res 12, 168–182 (1993). https://doi.org/10.1007/BF02918302
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DOI: https://doi.org/10.1007/BF02918302