Metabolomic analysis identifies inflammatory and noninflammatory metabolic effects of genetic modification in a mouse model of Crohn's disease.
Interleukin-10 is an immunosuppressive cytokine involved in the regulation of gastrointestinal mucosal immunity toward intestinal microbiota. Interleukin-10-deficient (IL10(-/-)) mice develop Crohn's disease-like colitis unless raised in germ-free conditions. Previous gas chromatography-mass spectrometry (GC-MS) metabolomic analysis revealed urinary metabolite differences between IL10(-/-) and wildtype C57BL/6 mice. To determine which of these differences were specifically associated with intestinal inflammation arising from IL10-deficiency, urine samples from IL10(-/-) and wildtype mice, housed in either conventional or specific pathogen-free conditions, were subjected to GC-MS metabolomic analysis. Fifteen metabolite differences, including fucose, xanthurenic acid, and 5-aminovaleric acid, were associated with intestinal inflammation. Elevated urinary levels of xanthurenic acid in IL10(-/-) mice were attributed to increased production of kynurenine metabolites that may induce T-cell tolerance toward intestinal microbiota. Liquid chromatography-mass spectrometry analysis confirmed that plasma levels of kynurenine and 3-hydroxykynurenine were elevated in IL10(-/-) mice. Eleven metabolite differences, including glutaric acid, 2-hydroxyglutaric acid, and 2-hydroxyadipic acid, were unaffected by the severity of inflammation. These metabolite differences may be associated with residual genes from the embryonic stem cells of the 129P2 mouse strain that were used to create the IL10(-/-) mouse, or may indicate novel functions of IL10 unrelated to inflammation.
School of Medical Sciences, University of Auckland, New Zealand.
Hui-Ming
HM
Lin
Matthew P G
MP
Barnett
Nicole C
NC
Roy
Nigel I
NI
Joyce
Shuotun
S
Zhu
Kelly
K
Armstrong
Nuala A
NA
Helsby
Lynnette R
LR
Ferguson
Daryl D
DD
Rowan
D000818:Animals; D002853:Chromatography, Liquid; D016000:Cluster Analysis; D003424:Crohn Disease / Q000097:blood / Q000378:metabolism* / Q000652:urine; D004195:Disease Models, Animal; D005856:Germ-Free Life; D007249:Inflammation / Q000378:metabolism*; D016753:Interleukin-10 / Q000235:genetics; D007737:Kynurenine / Q000031:analogs & derivatives / Q000097:blood / Q000378:metabolism / Q000652:urine; D008297:Male; D013058:Mass Spectrometry; D055442:Metabolome; D055432:Metabolomics / Q000379:methods*; D051379:Mice; D008822:Mice, Transgenic; D025341:Principal Component Analysis; D014364:Tryptophan / Q000097:blood / Q000378:metabolism / Q000652:urine; D014556:Urine / Q000737:chemistry
D016753:Interleukin-10; C005045:3-hydroxykynurenine; D007737:Kynurenine; D014364:Tryptophan