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• W2004257543 abstract "The biochemical characteristics of endogenous macrophage peroxidases (Po), and their relationship to myeloperoxidase (MPO), have heretofore been poorly understood and were examined in the current study. Rat alveolar macrophages (AM) were homogenized and fractionated by differential centrifugation into lysosomal and microsomal fractions. The Po activities in both fractions were separated using HPLC gel-filtration and two main activities were detected. One, in the lysosomal fraction, had a relative molecular mass (Mr) of 58,000, while the other, associated with the microsomal fraction corresponded to Mr 74,000. By comparison, MPO from rat polymorphonuclear neutrophils (PMN) had Mr 140,000. The 58- and 74-kDa Po activities also differed from MPO with respect to their apparent Km for H2O2 and optimum pH of activity. Using o-dianisidine as a substrate, the Km for H2O2 of the 58- and 74-kDa Po species was 0.4 and 0.19 mM, respectively, compared to 0.011 mM for MPO. Using monochlorodimedon, the corresponding values were 0.22 and 0.195 mM for the 58- and 74-kDa activities and 0.026 mM for MPO. With either substrate, MPO exhibited optimum activity at pH 5.4, compared to 5.2 for the 58-kDa activity and 4.8 for the 74-kDa species. Thus, rat AM contain two endogenous Po activities with biochemical characteristics distinct from those of MPO. Our findings suggest that these activities represent novel peroxidases that may play an important role in the oxidative metabolism of AM." @default.
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• W2004257543 date "1991-09-01" @default.
• W2004257543 modified "2023-09-23" @default.
• W2004257543 title "Biochemical characteristics of alveolar macrophagespecific peroxidase activities in the rat" @default.
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• W2004257543 doi "https://doi.org/10.1016/0003-9861(91)90417-h" @default.
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