Myeloperoxidase modulates the phagocytic activity of polymorphonuclear neutrophil leukocytes. Studies with cells from a myeloperoxidase-deficient patient.

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Myeloperoxidase modulates the phagocytic activity of polymorphonuclear neutrophil leukocytes. Studies with cells from a myeloperoxidase-deficient patient.

Patients lacking the primary granulae enzyme, myeloperoxidase (MPO), do not usually show any increased susceptibility to infection or altered inflammatory response, in contrast to several other biochemical defects in polymorphonuclear neutrophils. We have now evaluated the role of MPO on phagocyte function in a patient with complete MPO deficiency suffering from generalized pustular psoriasis. ...

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Ethylene formation by polymorphonuclear leukocytes. Role of myeloperoxidase

Ethylene formation from the thioethers, beta-methylthiopropionaldehyde (methional) and 2-keto-4-thiomethylbutyric acid by phagocytosing polymorphonuclear leukocytes (PMNs) was found to be largely dependent on myeloperoxidase (MPO). Conversion was less than 10% of normal when MPO-deficient PMNs were employed; formation by normal PMNs was inhibited by the peroxidase inhibitors, azide, and cyanide...

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Cyanate-mediated inhibition of neutrophil myeloperoxidase activity.

Cyanate (CNO-) forms spontaneously in solutions containing urea, and is present in urine and the body fluids of uraemic patients. We have explored the possibility that CNO- might be one of the unknown substances responsible for the reported impairment, by urine and uraemic plasma, of neutrophil oxidative metabolism (especially as measured by luminol-enhanced chemiluminescence). Luminol-enhanced...

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High neutrophil myeloperoxidase activity in smokers.

He also observed that the increase in MPO preceded the development of macrocytosis in megaloblastic anemia, thus suggesting that the threshold for the development of macrocytosis is higher than that for the development of increased MPO activity. We studied neutrophil MPO activity using the method of Herzog and Fahimi' and neutrophil MPO scoring by the method of Kaplow'in 40 chronic smokers (blo...

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Chemiluminescence and superoxide production by myeloperoxidase-deficient leukocytes.

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...

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ژورنال

عنوان ژورنال: Journal of Clinical Investigation

سال: 1984

ISSN: 0021-9738

DOI: 10.1172/jci111221