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*
Department of Microbiology, and
The Arthritis Center, Department of Medicine, School of Medicine, Boston University, Boston, MA 02118; and
The Schepens Eye Research Institute, Boston, MA 02114
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-1
, MIP-2,
MIP-1
, and MIP-1
. 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.
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