Neutrophils were isolated from freshly collected whole blood of healthy adults or adult mice using the EasySep Direct Human Neutrophil Isolation kit (19666, Stemcell Technologies) or EasySep Mouse Neutrophil Enrichment Kit (19762, Stemcell Technologies), respectively, with greater than 95% purity (63 (link)). Neutrophils were resuspended to a concentration of 1 × 106 cells/mL in Medium 199. Platelets were purified as described previously (66 (link), 67 (link)), resuspended to 1 × 108 cells/mL in Medium 199, and activated with 50 ng/mL convulxin (sc-202554, Santa Cruz Biotechnology) for 15 minutes. Activated platelets and neutrophils were incubated at a 100:1 ratio to induce NETs for 2.5 hours at 37°C in 5% CO2/95% air. HMGB1 was blocked by 10 μg/mL BoxA (HM-014, HMGBiotech). Neutrophils were pretreated for 1 hour with either nNIF or SCR peptides. NET levels were measured using the aforementioned MPO-DNA ELISA.
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