Characterization of PLA2 activity in human BALF. A, BALF from control subjects (n = 19) and asthmatic patients (n = 14) was assayed for PLA2 activity, as described in the Methods section. Boxes indicate means ± SEs. B, BALF was preincubated (for 1 hour at 37°C) with 10 mmol/L DTT, 10 μmol/L Me-Indoxam, 10 μmol/L AZ-1, or 2 mmol/L PMSF before the PLA2 activity assay. Data are presented as means ± SEs of BALF from 4 asthmatic patients. *P < .01 versus untreated.