Abstract
The immune system specifically recognizes and eliminates foreign antigens and, thus, protects integrity of the host. During maturation of the immune system, tolerance mechanisms develop that prevent or inhibit potentially harmful reactivities to self-antigens. Autoreactive B and T cells that are generated during immune responses are eliminated by apoptosis in the thymus, lymph nodes, or peripheral circulation or actively suppressed by regulatory T cells. However, autoreactive cells may survive due to failure of apoptosis or molecular mimicry, i.e., presentation and recognition of cryptic epitopes of self-antigens, or aberrant lymphokine production. Preservation of the host requires the development of immune responses to foreign antigen and tolerance to self-antigens. Autoimmunity results from a breakdown of tolerance to self-antigens through an interplay of genetic and environmental factors.
One of the basic functions of the immune system is to specifically recognize and eliminate foreign antigens and, thus, protect integrity of the host. Through rearrangements and somatic mutations of various gene segments encoding T and B cell receptors and antibody molecules, the immune system acquires tremendous diversity. During maturation of the immune system, recognition of self-antigens plays an important role in shaping the repertoires of immune receptors. Tolerance mechanisms develop that prevent or inhibit potentially harmful reactivities to self-antigens. These self-defense mechanisms are mediated on the levels of central and peripheral tolerance, i.e., autoreactive T cells are either eliminated by apoptosis in the thymus, lymph nodes, or peripheral circulation or actively suppressed by regulatory T cells. Likewise, autoreactive B cells are eliminated in the bone marrow or peripheral lymphoid organs. However, immune responses triggered by foreign antigens may be sustained by molecular mimicry, i.e., presentation and recognition of cryptic epitopes of self-antigens. Further downstream, execution of immune responses depends on the functioning of intracellular signaling networks and the cooperation of many cell types communicating via surface receptors, cytokines, chemokines, and antibody molecules. Therefore, autoimmunity represents the end result of the breakdown of one or multiple basic mechanisms of immune tolerance (Table 1).
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Perl, A. (2012). Pathogenesis and Spectrum of Autoimmunity. In: Perl, A. (eds) Autoimmunity. Methods in Molecular Biology, vol 900. Humana Press, Totowa, NJ. https://doi.org/10.1007/978-1-60761-720-4_1
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DOI: https://doi.org/10.1007/978-1-60761-720-4_1
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