Myeloperoxidase is a neutrophil enzyme that promotes oxidative stress in numerous inflammatory pathologies. It uses hydrogen peroxide to catalyze the production of strong oxidants including chlorine bleach and free radicals. A physiological defense against the inappropriate action of this enzyme has yet to be identified. We found that myeloperoxidase oxidized 75% of the ascorbate in plasma from...

Myeloperoxidase is a leukocyte component able to generate potent microbicidal substances. A homologous invertebrate blood cell protein, peroxinectin, is not only a peroxidase but also a cell adhesion ligand. We demonstrate in this study that human myeloperoxidase also mediates cell adhesion. Both the human myeloid cell line HL-60, when differentiated by treatment with 12-Otetradecanoyl-phorbol-...

STUDY OBJECTIVE To investigate possible changes in cells and molecular mediators of airway inflammation following inhaled steroid treatment of stable COPD patients. DESIGN Six-week open preliminary prospective study. SETTING A university respiratory disease clinic. PATIENTS : Stable COPD patients with mild disease. INTERVENTION Six-week treatment with inhaled beclomethasone (1.5 mg die)...

Neutrophil microbicidal activity is a consequence of overlapping antimicrobial systems that vary in prominence according to the conditions of the neutrophil-microbe interaction, the nature of the microbe, and its metabolic state. In this study, normal, myeloperoxidase-deficient, and respiratory burst-deficient (chronic granulomatous disease [CGD]) neutrophils killed Escherichia coli with equiva...

The myeloperoxidase system of neutrophils uses hydrogen peroxide and chloride to generate hypochlorous acid, a potent bactericidal oxidant in vitro. In a mouse model of polymicrobial sepsis, we observed that mice deficient in myeloperoxidase were more likely than wild-type mice to die from infection. Mass spectrometric analysis of peritoneal inflammatory fluid from septic wild-type mice detecte...

Myeloperoxidase aids in clearance of microbes by generation of peroxidase-mediated oxidants that kill leukocyte-engulfed pathogens. In this review, we will examine 1) strategies for in vitro evaluation of myeloperoxidase function and its inhibition, 2) ways to monitor generation of certain oxidant species during inflammation, and 3) how these methods can be used to approximate the total polymor...

the charts of 27 patients with kawasaki disease (kd) admitted to nemazee hospital in shiraz from january 1991 to october 1998 were reviewed to identify the results of mean peroxidase index (mpxi) values, a measure of neutrophil staining intensity, obtained by the technicon hi analyzer (technicon instruments corp., tarrytown, ny) within the first 10 days of the illness 2 separate groups of patie...

introduction antineutrophil cytoplasmic antibodies (anca)-associated glomerulonephritis (gn) is characterized by necrotizing and crescentic gn with paucity of immunoglobulin (ig) and complement deposition, which is also known as pauci-immune crescentic gn. membranous nephropathy (mn) is characterized by the formation of subepithelial immune deposit with resultant changes in glomerular basement ...

The role of superoxide anion- and myeloperoxidase-dependent reactions in the light emission by phagocytosing polymorphonuclear leukocytes has been investigated using leukocytes that lack myeloperoxidase, inhibitors (azide, superoxide dismutase), and model systems. Our earlier finding that oxygen consumption, glucose C-1 oxidation, and formate oxidation are greater in polymorphonuclear leukocyte...