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J Immunol. 2018 Mar 1;200(5):1727-1736. doi: 10.4049/jimmunol.1701473. Epub 2018 Jan 22.

Intracellular BH3 Profiling Reveals Shifts in Antiapoptotic Dependency in Human B Cell Maturation and Mitogen-Stimulated Proliferation.

Author information

1
Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC 27710; and Center for Virology, Duke University School of Medicine, Durham, NC 27710.
2
Department of Molecular Genetics and Microbiology, Duke University School of Medicine, Durham, NC 27710; and Center for Virology, Duke University School of Medicine, Durham, NC 27710 micah.luftig@duke.edu.

Abstract

Apoptosis is critical to B cell maturation, but studies of apoptotic regulation in primary human B cells is lacking. In this study, we sought to better understand the mechanisms of apoptotic regulation in normal and activated B cells. Using intracellular BH3 profiling, we defined the Bcl2 dependency of B cell subsets from human peripheral blood and tonsillar lymphoid tissue as well as mitogen-activated B cells. We found that naive and memory B cells were BCL-2-dependent, whereas germinal center B cells were MCL-1-dependent and plasma cells were BCL-XL-dependent. B cells stimulated to proliferate ex vivo by CpG or CD40L/IL-4 became more dependent on MCL-1 and BCL-XL As B cell lymphomas often rely on survival mechanisms derived from normal and activated B cells, these findings offer new insight into potential therapeutic strategies for lymphomas.

PMID:
29358277
PMCID:
PMC5821561
DOI:
10.4049/jimmunol.1701473
[Indexed for MEDLINE]
Free PMC Article

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