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An influx of neutrophils followed a short time later by an influx of macrophages to the infected site plays a key role in innate immunity against Escherichia coli infection. We found in this study that Vdelta1-/- mice exhibited impaired accumulation of peritoneal macrophages but not neutrophils and delayed bacterial clearance after i.p. inoculation with E. coli. Peritoneal gammadelta T cells from E. coli-infected wild-type mice produced CCL3/MIP-1alpha and CCL5/RANTES in response to gammadelta TCR triggering in vitro, whereas such production was not evident in gammadelta T cells from E. coli-infected Vdelta1-/- mice. Neutralization of CCL3/MIP-1alpha by a specific mAb in vivo significantly inhibited the accumulation of macrophages in the peritoneal cavity after E. coli infection, resulting in exacerbated bacterial growth in the peritoneal cavity. These results suggest that Vdelta1+ gammadelta T cells bridge a gap between neutrophils and macrophages in innate immunity during E. coli infection mediated by production of CC chemokines, enhancing macrophage trafficking to the site of infection.

the journal of immunology/the journal of immunology

Vδ1+ γδ T Cells Producing CC Chemokines May Bridge a Gap between Neutrophils and Macrophages in Innate Immunity during<i>Escherichia coli</i>Infection in Mice

Vδ1+ γδ T Cells Producing CC Chemokines May Bridge a Gap between Neutrophils and Macrophages in Innate Immunity duringEscherichia coliInfection in Mice