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• W156601935 abstract "Abstract Family studies on myeloperoxidase (MPO) deficiency have been carried out by quantitating the peroxidase activity of granulocyte preparations with three methods, namely guaiacol peroxidation, alanine decarboxylation, and spectroscopic analysis. The guaiacol assay failed to show a definite pattern of inheritance in two families with MPO- deficient subjects. Surprisingly, the granulocytes of three histochemically MPO-negative subjects had a peroxidase activity either half or even higher than that of control subjects. The peroxidase activity of these granulocyte preparations in these three subjects showed a positive correlation to the number of eosinophils. The possibility then considered was that eosinophils may have obscured the true pattern of inheritance in this assay. Two other methods of MPO assay, which are not influenced by the presence of eosinophil peroxidase (EPO), were therefore devised. One is based on the ability of MPO, but not EPO, to catalyze decarboxylation of L-alanine in the presence of Triton X-100, and the other relies on the different spectral properties of the two peroxidases. The results obtained with these two methods (1) were strictly comparable, (2) allowed detection of both totally and partially MPO-deficient subjects, (3) differed profoundly from those obtained with the guaiacol method when eosinophil- containing granulocyte preparations were used, and (4) revealed a pattern of autosomal recessive inheritance in the two families studied. The results of the three methods were comparable when eosinophil-free granulocyte preparations were assayed. It is concluded that failure to show a pattern of inheritance in some instances of primary MPO deficiency, or deviations from the autosomal recessive mode of transmission of this defect, may be attributed to interference by EPO. It is proposed that peroxidase assay methods not subject to EPO interference, such as the two described in this article, may be used, particularly in the detection of heterozygote subjects for MPO deficiency in the presence of high eosinophil counts." @default.
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• W156601935 date "1982-08-01" @default.
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• W156601935 title "New approaches to the detection of myeloperoxidase deficiency" @default.
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• W156601935 doi "https://doi.org/10.1182/blood.v60.2.323.323" @default.
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