MECHANISMS IN NEUTROPHIL PRIMING - CHARACTERIZATION OF THE OXIDATIVE RESPONSE INDUCED BY FORMYLMETHIONYL-LEUCYL-PHENYLALANINE IN HUMAN EXUDATED CELLS

被引:33
作者
FOLLIN, P [1 ]
BRIHEIM, G [1 ]
DAHLGREN, C [1 ]
机构
[1] LINKOPING UNIV,DEPT INFECT DIS,S-58185 LINKOPING,SWEDEN
关键词
D O I
10.1111/j.1365-3083.1991.tb01552.x
中图分类号
R392 [医学免疫学]; Q939.91 [免疫学];
学科分类号
100102 ;
摘要
Exudate human polymorphonuclear neutrophils were isolated and investigated regarding oxidative responsiveness and priming ability. The exudate neutrophils were found to produce an increased amount of O2- and H2O2 when stimulated with formylmethionyl-leucyl-phenylalanine (fMLP), i.e. these cells were metabolically primed. Cytochalasin B (cyt B) pretreatment affected the production of O2- by exudate cells, although to a lesser extent than the production by peripheral blood cells, in which a substantial increase was induced. Addition of N-ethylmaleimide (NEM) to activated exudate and peripheral blood cells revealed no difference in oxidase inactivation rate. To induce further priming, the cells were incubated in vitro with a synthetic diacylglycerol (sn-1,2-didecanoyglycerol; diC-10), or the Ca2+ ionophore ionomycin. Results of this procedure showed significant differences between exudate and peripheral blood neutrophils: the peripheral cells expressed a primed response, which was measured as increased fMLP-induced O2- production following incubation with both these substance; whereas the metabolic activity of exudated cells was not affected by diC10, but was significantly primed by ionomycin (P < 0.01). The exact route for diacylglycerol priming is unknown. However, our results with human neutrophils primed during exudation indicate an exhausted diC10-priming pathway, with a retained sensitivity for priming [Ca2+]i rises.
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页码:317 / 322
页数:6
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