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Review Article

The Role of Fas-mediated Apoptosis in Thyroid Autoimmune Disease

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Pages 251-264 | Received 03 Feb 1999, Published online: 13 Mar 2012
 

Abstract

Apoptosis is a carefully regulated mechanism of cell death that differs from necrosis and plays an important role in normal tissue development and homeostasis, as well as disease processes. Apoptosis also plays an important role in autoimmunity. Defective apoptosis can cause systemic autoimmunity by allowing the survival of autoreactive lymphocytes. It may also be involved in the pathogenesis of organ-specific autoimmune diseases, such as Hashimoto's thyroiditis, through altered target organ susceptibility. Apoptosis signaling pathways can be initiated through activation of death receptors. One of these pathways employs the death receptor Fas and its ligand (FasL). Fas expression and death pathway signaling have been demonstrated in the thyroid, but there is controversy surrounding the expression of FasL and its role in thyroid autoimmunity. A number of proteins, including FAP-1, Bcl-2 and I-FLICE may regulate the Fas pathway in the thyroid and provide potential mechanisms for modifying the pathogenesis of autoimmune thyroid disease.

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