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Cell death in B cell terminal differentiation rapidly follows cell cycle arrest in IL-6 differentiation of EBV-immortalized, IgG-bearing human lymphoblastoid cells in vitro. G1 arrest is now found to coincide with repression of EBNA2 and LMP1, two EBV genes essential for B cell transformation, without activation of the viral lytic cycle. IL-6-differentiated B cells die by apoptosis, as evidenced by increases in Annexin V binding activity, PARP cleavage, and chromatin disorganization. Expression of Mcl-1, a Bcl-2 family member, was specifically induced during IL-6 differentiation and down-regulated during apoptosis. Thus, IL-6 reverses EBV immortalization and activates the terminal differentiation program in IgG-bearing human B lymphoblastoid cells, including regulation of an anti-apoptotic gene to coordinate differentiation, cell cycle arrest, and cell death.
Fas is a surface receptor that can transmit signals for apoptosis. Using retroviral cDNA library-based functional cloning we identified a gene, toso, that blocks Fas-mediated apoptosis. Toso expression was confined to lymphoid cells and was enhanced after cell-specific activation processes in T cells. Toso appeared limited to inhibition of apoptosis mediated by members of the TNF receptor family and was capable of inhibiting T cell self-killing induced by TCR activation processes that up-regulate Fas ligand. We mapped the effect of Toso to inhibition of caspase-8 processing, the most upstream caspase activity in Fas-mediated signaling, potentially through activation of cFLIP. Toso therefore serves as a novel regulator of Fas-mediated apoptosis and may act as a regulator of cell fate in T cells and other hematopoietic lineages.
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