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Antigen-mediated T cell expansion regulated by parallel pathways of death.

Authors
Type
Published Article
Journal
Proceedings of the National Academy of Sciences
1091-6490
Publisher
Proceedings of the National Academy of Sciences
Publication Date
Volume
105
Issue
45
Pages
17463–17468
Identifiers
DOI: 10.1073/pnas.0808043105
PMID: 18981423
Source
Medline
License
Unknown

Abstract

T cells enigmatically require caspase-8, an inducer of apoptosis, for antigen-driven expansion and effective antiviral responses, and yet the pathways responsible for this effect have been elusive. A defect in caspase-8 expression does not affect progression through the cell cycle but causes an abnormally high rate of cell death that is distinct from apoptosis and does not involve a loss of NFkappaB activation. Instead, antigen or mitogen activated Casp8-deficient T cells exhibit an alternative type of cell death similar to programmed necrosis that depends on receptor interacting protein (Ripk1). The selective genetic ablation of caspase-8, NFkappaB, and Ripk1, reveals two forms of cell death that can regulate virus-specific T cell expansion.

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