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Effect of iron (III) in the presence of various ligands on the phagocytic and metabolic activity of human polymorphonuclear leukocytes.

B S van Asbeck, J J Marx, A Struyvenberg, J H van Kats and J Verhoef
J Immunol February 1, 1984, 132 (2) 851-856;
B S van Asbeck
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J J Marx
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A Struyvenberg
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J H van Kats
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J Verhoef
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Abstract

FeCl3 or Fe(III) that attached to chelating ligands such as citrate or nitrilotriacetic acid (NTA) at a molar ratio of 1:1 had a toxic effect on PMN. Uptake of radiolabeled Staphylococcus aureus by PMN, preincubated for 2 hr at 37 degrees C in a medium containing Fe(III)-citrate or Fe(III)-NTA, was significantly lower than that of control PMN preincubated without excess iron (p less than 0.002). However, at a 1:2 molar ratio of Fe(III) to citrate or NTA, the iron was not toxic. In contrast, the iron-liganding molecules transferrin and deferoxamine protected the PMN against the noxious effect of iron at concentrations just high enough to sequester all the iron. Fe(III) increased the generation of luminol chemiluminescence by stimulated PMN, whereas the oxygen consumption of the cells was not altered in the presence of Fe(III); this suggests a catalytic effect of iron on the production by PMN of oxygen metabolites at some step beyond the formation of superoxide. No effect of iron was observed when the incubation was performed at 4 degrees C, nor when an oxygen-radical scavenger such as thiourea, mannitol, or catalase was present in the incubation medium. Also, Fe(III) had much less effect on the phagocytic function of PMN of a patient with chronic granulomatous disease. The results indicate that the Fe(III)-induced defect in the phagocytic capacity of PMN depends on the nature and the concentration of the ligand attached to the iron ion, and also suggest that the noxious effect of iron on the PMN function is a result of its ability to catalyze the generation of toxic oxygen species by these cells.

  • Copyright © 1984 by American Association of Immunologists

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The Journal of Immunology
Vol. 132, Issue 2
1 Feb 1984
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Effect of iron (III) in the presence of various ligands on the phagocytic and metabolic activity of human polymorphonuclear leukocytes.
B S van Asbeck, J J Marx, A Struyvenberg, J H van Kats, J Verhoef
The Journal of Immunology February 1, 1984, 132 (2) 851-856;

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Effect of iron (III) in the presence of various ligands on the phagocytic and metabolic activity of human polymorphonuclear leukocytes.
B S van Asbeck, J J Marx, A Struyvenberg, J H van Kats, J Verhoef
The Journal of Immunology February 1, 1984, 132 (2) 851-856;
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Print ISSN 0022-1767        Online ISSN 1550-6606