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PMID: 7729896 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Endotoxin-induced desensitization of mouse macrophages is mediated in part by nitric oxide production.

Infection and immunity ·Vol. 63 ·No. 5 ·1995-05-00 ·Pages 1863-9

Fahmi H, Charon D, Mondange M, Chaby R

Abstract

Refractoriness (tolerance) to endotoxin effects, such as induction of tumor necrosis factor alpha (TNF-alpha) secretion, can be elicited in vitro in macrophages by preexposure of cells to endotoxin (lipopolysaccharide [LPS]) itself. The aim of this study was to determine whether this phenomenon is due to negative feedback mediated by the free radical nitric oxide (NO) produced by cells when they are activated by LPS. Among several efficient inhibitors of NO production, NG-monomethyl-L-arginine did not induce concomitant inhibition of TNF-alpha secretion. Mouse macrophages that were exposed to LPS in the presence of NG-monomethyl-L-arginine partially maintained the ability to secrete TNF-alpha in response to a second LPS stimulation, compared with cells preexposed to LPS alone, thus suggesting that NO is involved in part in LPS-induced desensitization of cells. Furthermore, direct exposure of cells to the NO-generating compounds sodium nitroprusside and S-nitroso-N-acetylpenicillamine mimicked LPS-induced desensitization. However, low concentrations of a synthetic lipid (lipid M4) that is structurally analogous to the reducing end of the lipid A moiety of LPS induced desensitization of mouse macrophages without concomitant production of NO. Taken together, these data suggest that although NO actually takes part in LPS-induced desensitization of mouse macrophages, additional and yet unknown mechanisms must also exist.

MeSH Terms
Animals Arginine/analogs & derivatives,pharmacology Cells, Cultured Desensitization, Immunologic Dose-Response Relationship, Drug Endotoxins/immunology Glycolipids/immunology Lipopolysaccharides/immunology Macrophages, Peritoneal/drug effects,immunology,metabolism Mice Nitric Oxide/antagonists & inhibitors,biosynthesis Time Factors Tumor Necrosis Factor-alpha/biosynthesis omega-N-Methylarginine
Chemicals
Endotoxins Glycolipids Lipopolysaccharides M4 glycolipid Tumor Necrosis Factor-alpha omega-N-Methylarginine Nitric Oxide Arginine
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Fahmi H
Laboratory of Immunology, Faculty of Science, Université Sidi Mohamed Ben Abdellah, Fès, Morocco.
Charon D
Mondange M
Chaby R
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Article Info
Journal
Infection and immunity
Abbr.
Infect Immun
ISSN
0019-9567
DOI
10.1128/iai.63.5.1863-1869.1995
Published
1995-05-00
Pages
1863-9
Language
English
Region
United States
NLM ID
0246127
PMCID
PMC173236
Subset
IM
External Links
PubMed source DOI: 10.1128/iai.63.5.1863-1869.1995 PMC Full Text View journal details
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