Glutamine decreases interleukin-8 and interleukin-6 but not nitric oxide and prostaglandins E2 production by human gut in-vitro

被引:58
作者
Coëffier, M
Marion, R
Leplingard, A
Lerebours, E
Ducrotté, P
Déchelotte, P
机构
[1] ADEN EA 3234, Rouen, France
[2] Inst Federat Rech Multidisciplinaires Peptides IF, Rouen, France
关键词
cytokines; eicosanoids; nitric oxide; glutamine; gut;
D O I
10.1006/cyto.2002.1027
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Background. Glutamine modulates cytokine production in various tissues but its effects on the production of other inflammatory mediators such as eicosanoids and nitric oxide have not been investigated in human gut. Aim: To evaluate the influence of glutamine on interleukin (IL)-8, IL-6, nitric oxide and prostaglandin E-2 production by human gut. Methods: Ten fasted volunteers received either enteral glutamine or isonitrogenous amino acids over 6 h in a cross-over design. Series of duodenal biopsies were frozen or cultured for 24 h with 0.5 or 5 mM of glutamine or amino acids. IL-6, IL-8 and PGE(2) were measured in culture media by ELISA and nitrites by Griess assay. mRNA levels for IL-6, IL-8, Cyclooxygenase-2 and NO synthase-2 were assessed in biopsies by RT-PCR. Results in percent, (median [range]) were compared by Wilcoxon test. Results: Glutamine decreased IL-8 and IL-6 in-vitro production: 63 [2-173] vs 100 [19-177] and 37 [5-489] vs 100 [33-431], both P<0.05. IL-8 mRNA level also decreased in biopsies cultured with 5 mM glutamine: 26 [13-142] vs 92 [34-215], P<0.05. Nitrites and PGE(2) concentrations were not significantly affected by glutamine. Conclusion: Glutamine has a specific inhibitory effect on pro-inflammatory cytokine production in the gut and may contribution to the modulation of intestinal inflammation. (C) 2002 Elsevier Science Ltd. All rights reserved.
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页码:92 / 97
页数:6
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