Article (Scientific journals)
Bactericidal activity against Pseudomonas aeruginosa is acquired by cultured human monocyte-derived macrophages after uptake of myeloperoxidase.
Mathy-Hartert, M.; Deby, Ginette; Melin, Pierrette et al.
1996In Experientia, 52 (2), p. 167-74
Peer Reviewed verified by ORBi
 

Files


Full Text
268.pdf
Publisher postprint (876.38 kB)
Request a copy

All documents in ORBi are protected by a user license.

Send to



Details



Keywords :
Blood Bactericidal Activity; Cells, Cultured; Chromatography, Liquid; Humans; Hydrogen Peroxide/metabolism; Kinetics; Macrophages/physiology; Monocytes/physiology; Neutrophils/enzymology; Peroxidase/isolation & purification/metabolism; Polysaccharides, Bacterial; Pseudomonas aeruginosa; Time Factors
Abstract :
[en] Myeloperoxidase (MPO) is an enzyme located within polymorphonuclear neutrophils capable of producing cytotoxic oxidant species that are particularly active against bacteria with polysaccharide capsules. Pseudomonas aeruginosa (10(6) bacteria per 1ml) are killed within 1 h in vitro by a MPO/H2O2/C1- system (48mU=132ng of MPO). The question arose as to whether human macrophages would acquire cytotoxic activity when loaded with this enzyme. Monocytes were therefore isolated from human blood and cultured for up to ten days to induce maturation to macrophages. These cells lost endogenous MPO within five days while H2O2 production in response to stimulation by phorbol myristate acetate (10(-6)M) decreased to 23% within ten days. On the other hand, their capacity to take up exogenous MPO increased fourfold from day three to day ten. Human macrophages cultured from eight days (when both H2O2 production and MPO uptake were sufficient) were therefore used to study the effects of MPO uptake on cytocidal activity against Pseudomonas aeruginosa. After a 1 h MPO loading period, macrophages (5X10(5) cells per ml) were incubated in the presence of bacteria (0.5 to 2X10(6) bacteria per ml) for 2 h at 37 degrees C. At a bacteria/macrophage ratio of 1, only 34.8+/-7.0% of bacteria survived (compared to killing by non-loaded macrophages), while 74.4+/-9.3% survived at a ratio of 4. From these results, we conclude that loading macrophages with exogenous MPO could enhance their microbicidal activity, suggesting a potentially useful therapeutic application.
Disciplines :
Business & economic sciences: Multidisciplinary, general & others
Anesthesia & intensive care
Author, co-author :
Mathy-Hartert, M.
Deby, Ginette ;  Université de Liège - ULiège > Centre de l'oxygène : Recherche et développement (C.O.R.D.)
Melin, Pierrette  ;  Centre Hospitalier Universitaire de Liège - CHU > Microbiologie médicale
Lamy, Maurice ;  Université de Liège - ULiège > Département des sciences cliniques > Département des sciences cliniques
Deby, C.
Language :
English
Title :
Bactericidal activity against Pseudomonas aeruginosa is acquired by cultured human monocyte-derived macrophages after uptake of myeloperoxidase.
Publication date :
1996
Journal title :
Experientia
ISSN :
0014-4754
Publisher :
Birkhauser Verlag, Basel, Switzerland
Volume :
52
Issue :
2
Pages :
167-74
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 25 March 2009

Statistics


Number of views
243 (1 by ULiège)
Number of downloads
0 (0 by ULiège)

Scopus citations®
 
30
Scopus citations®
without self-citations
21
OpenCitations
 
23

Bibliography


Similar publications



Contact ORBi