Fig. 6.
Release of O2− radicals by unstimulated PMNs preincubated with native supernatant of autologous degranulated PMNs, MPO-immunodepleted supernatant, or purified MPO added to buffer.
In the presence of soluble MPO during preincubation, PMNs became responsive to anti-MPO antibody, resulting in the release of O2− radicals.