1. Cultured human alveolar and peritoneal macrophages have been shown to release thromboxane B2 and leukotriene B4.
2. The release was facilitated by stimulation of the macrophages with opsonized zymosan A (1.2 mg/ml).
3. The release was inhibited in a concentration-dependent manner by incubation of the cells with dexamethasone (1 nmol/l to 1 μmol/l).