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- W3094083023 abstract "The production of superoxide anions (O2•-) by the phagocyte NADPH oxidase complex has a crucial role in the destruction of pathogens in innate immunity. Majority of in vitro studies on the functioning of NADPH oxidase indirectly follows the enzymatic reaction by the superoxide reduction of cytochrome c (cyt c). Only few reports mention the alternative approach consisting in measuring the NADPH consumption rate. When using membrane vesicles of human neutrophils, the enzyme specific activity is generally found twice higher by monitoring the NADPH oxidation than by measuring the cyt c reduction. Up to now, the literature provides only little explanations about such discrepancy despite the critical importance to quantify the exact enzyme activity. We deciphered the reasons of this disparity in studying the role of key parameters, including. cyt c and arachidonic acid concentrations, in conjunction with an ionophore, a detergent and using Clark electrode to measure the O2 consumption rates. Our results show that the O2•- low permeability of the vesicle membrane as well as secondary reactions (O2•- and H2O2 disproportionations) are strong clues to shed light on this inconsistency. These results altogether indicate that the cyt c reduction method underestimates the accurate Nox2 activity." @default.
- W3094083023 created "2020-10-29" @default.
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- W3094083023 date "2021-01-01" @default.
- W3094083023 modified "2023-10-18" @default.
- W3094083023 title "Impacts of vesicular environment on Nox2 activity measurements in vitro" @default.
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- W3094083023 doi "https://doi.org/10.1016/j.bbagen.2020.129767" @default.
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