Apoptosis and Its Relevance to Autoimmunity

Editor(s): Elkon K.B. (Seattle, Wash.) 
Table of Contents
Vol. 9, No. , 2006
Section title: Paper
Elkon K (ed): Apoptosis and Its Relevance to Autoimmunity. Curr Dir Autoimmun. Basel, Karger, 2006, vol 9, pp 95-119

Mitochondria, Cell Death, and B Cell Tolerance

Deming P. · Rathmell J.
aDepartment of Pathology and Vermont Cancer Center, University of Vermont, Burlington, Vt., and b Department of Pharmacology and Cancer Biology, Department of Immunology, Sarah W. Stedman Center for Nutrition and Metabolism, Duke University Medical Center, Durham, N.C., USA

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To prevent autoimmunity, it is critical that tolerance mechanisms block autoantibody production from self-reactive B cells. B cell tolerance is maintained through mechanisms that can reversibly or irreversibly silence autoreactive B cells. Of these mechanisms, those that lead to B cell death offer the most reliable form of tolerance to prevent autoimmunity. In many cases, death of autoreactive B cells is regulated by the cell intrinsic, or mitochondrial pathway of cell death. The pro-apoptotic Bcl-2 family proteins, Bak, Bax, and Bim have been shown to be required for disruption of mitochondria and intrinsic cell death of self-reactive B cells whereas the anti-apoptotic Bcl-2, Bcl-xL, and Mcl-1 can prevent cell death by interfering with the action of Bax and Bak. Bcl-2 and Bcl-xL have also been shown to regulate the autophagic cell death pathway that may also play a role in B cell tolerance. Even after mitochondrial disruption, mechanisms exist that may impede activation of caspases and death of autoreactive B cells. Together, understanding of cell death mechanisms and how they may affect B cell tolerance has made significant recent advances and it is now important to incorporate alternate and post-mitochondrial cell death mechanisms into B cell tolerance models.

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