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From the * Ina Sue Perlmutter Cystic Fibrosis Laboratory and Department of Pediatrics, Children's
Hospital, Department of Medicine, Beth Israel Hospital, Harvard Medical School, Boston,
Massachusetts 02115
We recently demonstrated that gene-targeted disruption of the C5a anaphylatoxin receptor
prevented lung injury in immune complex-mediated inflammation. In this study, we compare
the effect of C5aR deficiency in immune complex-induced inflammation in the peritoneal
cavity and skin with the results derived from our immune complex alveolitis model. C5aR-
deficient mice exhibit decreased migration of neutrophils and decreased levels of TNF-
and
interleukin 6 in the peritoneal reverse passive Arthus reaction compared to their wild-type littermates. In the reverse passive Arthus reaction in the skin the C5aR was also required for the
full expression of neutrophil influx and edema formation; C5aR-deficient mice showed reduced neutrophil migration and microvascular permeability changes. In contrast to our studies
in immune complex-induced lung inflammation, C5aR deficiency does not completely prevent injury in the peritoneal cavity and skin. These data indicate a dominant role for the C5aR and its ligand in the reverse passive Arthus reaction in the lung and a synergistic role together
with other inflammatory mediators in immune complex-mediated peritonitis and skin injury.
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