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- W4254654330 abstract "Myeloperoxidase (MPO), a heme enzyme present in the primary granules of polymorphonuclear leukocytes (PMNs), has been demonstrated to participate in the oxygen-dependent microbicidal activity of these cells. Evidence for the importance of MPO in this role comes in part from studies of normal PMNs treated with the heme enzyme inhibitor, sodium azide. MPO has also been suggested to regulate the respiratory activity of PMNs during phagocytosis. The role of MPO in PMN oxygen metabolism was examined by studying parameters of the respiratory burst of PMNs from a number of unrelated MPO-deficient subjects; in addition, the ability of heme enzyme inhibitors to duplicate the MPO-deficient state was studied by treating normal and MPO-deficient cells with these compounds. MPO-deficient PMNs were found to have a time-dependent hypermetabolic response as assessed by measurement of oxygen consumption, superoxide generation, hydrogen peroxide release, and hexose monophosphate shunt activity. Catabolic pathways for hydrogen peroxide were normal, suggesting the increased recovery of oxygen metabolites reflects increased production rather than decreased catabolism of H2O2. These observations support the concept that MPO may play an important role in terminating the respiratory burst of normal PMNs. The three heme enzyme inhibitors studied--sodium azide, potassium cyanide, and 3-aminotriazole--differed greatly in the degree to which they inhibited various enzymatic systems in the PMN. Nonetheless, as a group, they exerted qualitatively similar effects on oxygen metabolism of normal and of MPO-deficient PMNs. This indicates that many of the mechanisms by which heme enzyme inhibitors influence PMN metabolism are independent of the inhibition of MPO. Conclusions from studies using such treatment of PMNs should be interpreted with caution." @default.
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- W4254654330 date "1983-03-01" @default.
- W4254654330 modified "2023-09-27" @default.
- W4254654330 title "Role of myeloperoxidase in the respiratory burst of human neutrophils" @default.
- W4254654330 doi "https://doi.org/10.1182/blood.v61.3.483.bloodjournal613483" @default.
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