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* Phagocyte Laboratory, Medical Research Council Center for Inflammation Research, University of Edinburgh, Edinburgh, United Kingdom; and
Dr. Richard A. Lang Division of Developmental Biology and Department of Ophthalmology, Childrens Hospital Research Foundation, Cincinnati, OH 45229
The role played by resident macrophages (M
) in the initiation of peritoneal inflammation is currently unclear. We have used a conditional M
ablation strategy to determine the role of resident peritoneal M
in the regulation of neutrophil (PMN) recruitment in experimental peritonitis. We developed a novel conditional M
ablation transgenic mouse (designated CD11bDTR) based upon CD11b promoter-mediated expression of the human diphtheria toxin (DT) receptor. The murine DT receptor binds DT poorly such that expression of the human receptor confers toxin sensitivity. Intraperitoneal injection of minute (nanogram) doses of DT results in rapid and marked ablation of F4/80-positive M
populations in the peritoneum as well as the kidney, and ovary. In experimental peritonitis, resident M
ablation resulted in a dramatic attenuation of PMN infiltration that was rescued by the adoptive transfer of resident nontransgenic M
. Attenuation of PMN infiltration was associated with diminished CXC chemokine production at 1 h. These studies indicate a key role for resident peritoneal M
in sensing perturbation to the peritoneal microenvironment and regulating PMN infiltration.
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