Document Detail

Increased expression of inducible nitric oxide synthase in circulating monocytes from patients with active inflammatory bowel disease.
MedLine Citation:
PMID:  12059056     Owner:  NLM     Status:  MEDLINE    
BACKGROUND: Inducible nitric oxide synthase (iNOS) expression and nitric oxide (NO) synthesis are increased in epithelial cells and in tissue macrophages of the inflamed mucosa from patients with inflammatory bowel disease (IBD). Since tissue macrophages are derived from circulating monocytes, we studied iNOS expression in circulating monocytes and related this expression to disease activity. In view of the possible role of NO in monocyte function, we also studied iNOS expression in relation to markers of monocyte activation.
METHODS: The expression of iNOS in circulating monocytes from 15 patients with active IBD, 6 patients who went into remission and 18 healthy controls was quantified by flow cytometry and correlated with surface markers (CD63, CD11b, HLA-DR) for monocyte activation. In addition, iNOS expression in circulating monocytes was assessed by Western blotting, immunocytochemistry and measurement of the NO metabolites nitrite and nitrate in plasma.
RESULTS: The expression of iNOS in circulating monocytes and the percentage of iNOS-positive monocytes were increased in patients with active IBD compared to healthy controls (fluorescence index: 1.3 (0.1-6.3) versus 0.8 (0.0-1.8); P < 0.05: percentage of iNOS positive monocytes: 37.3 (1.0-77.0)% versus 5.3 (0.0-43.3)%; P<0.01). The six patients who went into remission all had a marked reduction of iNOS expression. iNOS expression was confirmed by Western blotting and immunocytochemistry. Plasma nitrite and nitrate levels were elevated in three patients with active 1BD. The surface markers for monocyte activation, CD63 and CD11b, were not elevated. HLA-DR expression was decreased on circulating monocytes from patients with active ulcerative colitis.
CONCLUSIONS: iNOS is increased in circulating monocytes from patients with active IBD and this increased expression correlates with disease activity. Considering the decreased HLA-DR expression and absence of monocyte activation markers, NO produced by iNOS may have a function in suppressing systemic monocyte activation.
G Dijkstra; A J H Zandvoort; A C Muller Kobold; A de Jager-Krikken; P Heeringa; H van Goor; H M van Dullemen; J W Cohen Tervaert; A van de Loosdrecht; H Moshage; P L M Jansen
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Scandinavian journal of gastroenterology     Volume:  37     ISSN:  0036-5521     ISO Abbreviation:  Scand. J. Gastroenterol.     Publication Date:  2002 May 
Date Detail:
Created Date:  2002-06-12     Completed Date:  2002-12-06     Revised Date:  2011-10-27    
Medline Journal Info:
Nlm Unique ID:  0060105     Medline TA:  Scand J Gastroenterol     Country:  Norway    
Other Details:
Languages:  eng     Pagination:  546-54     Citation Subset:  IM    
Dept of Internal Medicine, University Hospital, Groningen, The Netherlands.
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MeSH Terms
Biological Markers / analysis
Flow Cytometry
Inflammatory Bowel Diseases / enzymology,  immunology*
Middle Aged
Monocytes / metabolism*
Nitric Oxide Synthase / biosynthesis*
Nitric Oxide Synthase Type II
Reg. No./Substance:
0/Biological Markers; EC protein, human; EC Oxide Synthase; EC Oxide Synthase Type II

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