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• W2012180617 abstract "Increased neopterin concentrations in human serum indicate activation of cell-mediated immune response. Earlier we have shown that neopterin enhanced generation of singlet oxygen, hydroxyl radical and nitric oxide in human peripheral blood neutrophils by NADPH-independent pathways. To further investigate a participation of neopterin in reactive species production by neutrophils, we studied its influence on myeloperoxidase (MPO) activity. MPO was isolated from human peripheral blood neutrophils from healthy donors. Generation of reactive species by MPO/H2O2 in Earl's solution (pH=7.2) at 37 °C was investigated by monitoring of chemiluminescence using luminol as light emitter. In the MPO/H2O2 system, neopterin increased singlet oxygen in a concentration-dependent manner, but it decreased formation of other oxidizing species. Comparing several oxygen scavengers, formation of reactive species was totally blocked by sodium azide (NaN3), both in the presence and in the absence of neopterin. Superoxide dismutase (SOD) and d-mannitol insignificantly decreased chemiluminescence of this reaction, but diazabicyclo[2.2.2]octane (DABCO) strongly inhibited it. We conclude that the effects of neopterin on neutrophils' MPO are directed to increase singlet oxygen and to decrease other reactive species via inhibition of MPO and/or scavenging of reactive species." @default.
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• W2012180617 date "2004-04-01" @default.
• W2012180617 modified "2023-09-27" @default.
• W2012180617 title "Influence of neopterin on generation of reactive species by myeloperoxidase in human neutrophils" @default.
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• W2012180617 doi "https://doi.org/10.1016/j.bbagen.2004.02.007" @default.
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