Activation of neutrophils NADPH oxidase by PMA: cytosol activity is translocated in phorbol-primed neutrophils.

1. Translocation of cytosol activity in phorbol-primed neutrophils was studied. 2. Prior exposure of PMA or FMLP could potentiate the oxidative response by subsequent heterogeneous stimulus, FMLP or PMA. 3. In FMLP-primed neutrophils, the cytosol had almost the same activity as resting one and cytosol activity was not eluted from the membrane. 4. In PMA-primed neutrophils, however, the cytosol had less activity and cytosol activity was correspondingly eluted from the membrane. 5. These observations suggested that cytosol activity was translocated in PMA-primed cells.