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- W1838640007 abstract "Abstract Fas ligand (FasL) is a potent proapoptotic type-II transmembrane protein that can cause cell death in Fas+ target populations. Despite the presumed “silent” nature of apoptotic cell death, forced expression of FasL can induce a dramatic inflammatory response. To elucidate the in vivo mechanism(s) linking FasL and inflammation, we used a membrane-bound cell-free form of FasL (mFasL-vesicle preparation (VP)). We found that i.p. injection of FasL-microvesicles led to the rapid activation and subsequent demise of Mac1high resident peritoneal macrophages. Apoptosis of Mac1high peritoneal macrophages was observed within 0.5 h of mFasL-VP injection and correlated with the detection of increased macrophage inflammatory protein (MIP)-2 levels in peritoneal lavage fluid as well as induced RNA expression of IL-1β, MIP-2, MIP-1α, and MIP-1β. In vitro culture of purified peritoneal populations identified Mac1high cells as the major cytokine/chemokine producers in response to mFasL-VP. Purified Mac1high cells exposed to FasL could restore the ability of Fas-deficient mice to mount an inflammatory response. Our data demonstrate that the FasL-mediated inflammatory response starts with the production of proinflammatory mediators by preapoptotic resident tissue macrophages and suggest a general mechanism responsible for neutrophil inflammation seen in cases of FasL-expressing allografts." @default.
- W1838640007 created "2016-06-24" @default.
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- W1838640007 date "2001-12-01" @default.
- W1838640007 modified "2023-10-11" @default.
- W1838640007 title "Fas Ligand Engagement of Resident Peritoneal Macrophages In Vivo Induces Apoptosis and the Production of Neutrophil Chemotactic Factors" @default.
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- W1838640007 doi "https://doi.org/10.4049/jimmunol.167.11.6217" @default.
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