Determination of reversibility
of MPO inhibition; ABAH (6 μM),
SHA (100 μM), 1c (50 μM), and 2k (50 μM), all in DMSO (1% final) or DMSO alone (Control), were
incubated with MPO bound to wells of an ELISA plate for 1 h in the
presence of 50 μM H2O2. Wells were either
washed to remove inhibitor (gray bars) or remained unwashed (black
bars) prior to measuring MPO activity as in Methods, SI. Results show mean MPO activity (ΔA652 nm/min values ± SEM, n =
3).