Magnesium-dependent induction of phagocytosis-associated chemiluminescence of adherent human polymorphonuclear leukocytes by non-opsonized zymosan
✍ Scribed by Roschger, Paul ;Graninger, Wolfgang ;Klima, Herbert
- Publisher
- John Wiley and Sons
- Year
- 1990
- Weight
- 498 KB
- Volume
- 5
- Category
- Article
- ISSN
- 0884-3996
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✦ Synopsis
A severe dysfunction in the cellular response of human polymorphonuclear leukocytes (PMNL) t o non-opsonized zymosan was observed under a deficiency of extracellular Mg2+. The phagocytosis-association native (luminol-independent) luminescence (NL), as well as luminol-dependent luminescence (LDL) (detected simultaneously and discriminated by spectral methods), was strongely inhibited. Apart from a general decrease of total light production, a Mg2+-concentration-dependent delay of the maximum of NL and LDL was observed. A disorder in recruitment of activated membrane-bound NADPH-oxidase of PMNL is suggested. The presence of extracellular Ca2+ did not compensate for the Mg2+ deficit. In the presence of Mg2+ only a slight Ca2+-dependent reduction of NL was obtained, but Ca2+ seemed t o selectively promote LDL. This may indicate a positive influence of Ca2+ on the myeloperoxidase release from the cells. Experiments with the metalions-chelating agents EDTA and EGTA, which complex Mg2+ t o differing extents, confirmed the important role of Mg2+ in PMNL-activation by non-opsonized zyrnosan.