Sterile peritonitis was induced by injecting thioglychollate, along with either PBS, apoptotic cells (AC), necrotic human neutrophils (NN), LL37, HNP1-3 or mouse necrotic neutrophils (mNN). After 4 hours peritoneal lavages were used to isolate inflammatory GR1+F480+ macrophages (a) and neutrophils (b), which were characterised by FACS and compared to cell numbers in control mice with peritonitis given PBS. Experiment is representative of 2 separate expts with 5 mice per group. (c) In separate experiments resting murine peritoneal macrophages were isolated and stimulated in vitro with CD40/IFN-γ along with α-defensins and supernatants were collected at various timepoints and tested for TNF-α. *** p ≤0.001, * p ≤0.01, error bars =SEM.