期刊
IMMUNITY
卷 29, 期 5, 页码 720-733出版社
CELL PRESS
DOI: 10.1016/j.immuni.2008.08.014
关键词
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类别
资金
- Alexander von Humboldt Foundation
- Fundacion Agencia Aragonesa para Investigacion y Desarrollo
- [5ROlAI04494-03]
- [KO1 CA100095]
Granzyme A (GzmA) is considered a major proapoptotic protease. We have discovered that GzmA-induced cell death involves rapid membrane damage that depends on the synergy between micromolar concentrations of GzmA and sublytic perforin (PFN). Ironically, GzmA and GzmB, independent of their catalytic activity, both mediated this swift necrosis. Even without PFN, lower concentrations of human GzmA stimulated monocytic cells to secrete proinflammatory cytokines (interfeukin-1 beta [IL-1 beta], TNF alpha, and IL-6) that were blocked by a caspase-1 inhibitor. Moreover, murine GzmA and GzmA(+) cytotoxic T lymphocytes (CTLs) induce IL-1 beta from primary mouse macrophages, and GzmA(-/-) mice resist lipopolysaccharide-induced toxicity. Thus, the granule secretory pathway plays an unexpected role in inflammation, with GzmA acting as an endogenous modulator.
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