The life and death of a B cell
Regulation of apoptosis in the B cell lineage has implications for homeostasis, quality control of the antibody response, and tolerance. In this chapter we examine the different checkpoints that control life and death decisions of B cells during the antigen-independent and antigen-dependent phases o...
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| Main Authors: | , , |
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| Format: | Chapter/Article |
| Language: | English |
| Published: |
27 August 2020
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| In: |
Advances in cancer research
Year: 2002, Pages: 195-225 |
| DOI: | 10.1016/S0065-230X(02)86006-7 |
| Online Access: | Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1016/S0065-230X(02)86006-7 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0065230X02860067 
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| Author Notes: | Thierry Defrance, Montserrat Casamayor-Pallejá, Peter H. Krammer |
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| 520 | |a Regulation of apoptosis in the B cell lineage has implications for homeostasis, quality control of the antibody response, and tolerance. In this chapter we examine the different checkpoints that control life and death decisions of B cells during the antigen-independent and antigen-dependent phases of their development. We discuss the cell death mechanism involved in elimination of unwanted B cells at different stages of their development as well as the signals that trigger or repress the apoptotic process. At the steady state, before or after development of an immune response, B cell apoptosis ensures that the antigen receptor (BCR) on newly produced B cells is functional and does not recognize self-antigens with high avidity. It also ensures that the size of the peripheral B cell compartment remains constant in spite of the continuous input of B cells from the bone marrow. All these processes are controlled by the mitochondrial death pathway and are thus perturbed by overexpression of the antiapoptotic members of the bcl-2 gene family. By contrast, the death receptor pathway plays a prominent role during the antigen-dependent phase of B cell development. Three sets of membrane molecules stand as crucial regulators of B cell survival. First, the BCR which plays a central but ambiguous role. On the one hand, it triggers death of B cells that recognize self-antigens or have been exposed to repeated antigenic stimulations. On the other hand, it promotes survival of the peripheral mature B cell pool and protects activated B cells from CD95-induced killing. Second, the death receptor Fas/CD95 which is instrumental in censoring B cells activated in a bystander fashion at the initiation of the response to T-dependent antigens. It also drives elimination of low-affinity and self-reactive B cell clones that arise through the process of somatic mutations during the germinal center reaction. As such, it contributes to the affinity maturation of the antibody response. Finally, three membrane receptors (TACI, BCMA, and BAFF-R) which bind a newly discovered member of the tumor necrosis factor family named BAFF. BAFF acts specifically on peripheral B cells but its cellular targets seem to be restricted to two splenic B cell populations: (i) transitional immature B cells and (ii) marginal zone B cells, known to be responsible for the response to thymus-independent type 2 antigens. This suggests its possible implication in positive selection of peripheral B cells and in the antibacterial B cell responses. | ||
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