Alterations of phospholipid concentration and species composition of the intestinal mucus barrier in ulcerative colitis: a clue to pathogenesis
Autor: | Wolf-Dieter Lehmann, Alexandra Zahn, Annika Braun, Ulrike Schoenfeld, Anke Tietje, Irina Treede, Peter Kienle, Wolfgang Stremmel, Joachim Fuellekrug, T. Welsch, Rebecca Ruhwald, Robert Ehehalt, Gerhard Erben, Daniel Gotthardt |
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Rok vydání: | 2009 |
Předmět: |
medicine.medical_specialty
Pathology Spectrometry Mass Electrospray Ionization Colon Phospholipid Biology Inflammatory bowel disease Pathogenesis chemistry.chemical_compound Mice Adrenal Cortex Hormones Ileum Internal medicine medicine Immunology and Allergy Animals Humans Colitis Intestinal Mucosa Phospholipids chemistry.chemical_classification Gastroenterology Fatty acid Lysophosphatidylcholines Colonoscopy Middle Aged medicine.disease Mucus Ulcerative colitis Sphingomyelins Mice Inbred C57BL Lysophosphatidylcholine Endocrinology chemistry Mice Inbred CBA Phosphatidylcholines Colitis Ulcerative Female |
Zdroj: | Inflammatory bowel diseases. 15(11) |
ISSN: | 1536-4844 |
Popis: | Background: Phospholipids are essential for the normal function of the intestinal mucus barrier. The objective of this study was to systematically investigate phospholipids in the intestinal mucus of humans suffering from inflammatory bowel diseases, where a barrier defect is strongly supposed to be pathogenetic. Methods: Optimal mucus recovery was first validated in healthy mice and the method was then transferred to the endoscopic acquisition of ileal and colonic mucus from 21 patients with ulcerative colitis (UC), 10 patients with Crohn's disease (CD), and 29 healthy controls. Nano-electrospray ionization tandem mass spectrometry (ESI-MS/MS) was used to determine phosphatidylcholine (PC), lysophosphatidylcholine (LPC), and sphingomyelin (SM) in lipid extracts of mucus specimens. Results: Human and rodent mucus contained very similar phospholipid species. In the ileal and colonic mucus from patients suffering from UC, the concentration of PC was highly significantly lower (607 ± 147 pmol/100 μg protein and 745 ± 148 pmol/100 μg protein) compared to that of patients with CD (3223 ± 1519 pmol/100 μg protein and 2450 ± 431 pmol/100 μg protein) and to controls (3870 ± 760 pmol/100 μg protein and 2790 ± 354 pmol/100 μg protein); overall, P = 0.0002 for ileal specimens and P < 0.0001 for colonic specimens. Independent of disease activity, patients suffering from UC showed an increased saturation grade of PC fatty acid residues and a higher LPC-to-PC ratio. Conclusions: The intestinal mucus barrier of patients with UC is significantly altered concerning its phospholipid concentration and species composition. These alterations may be very important for the pathogenesis of this disease and underline new therapeutic strategies. Inflamm Bowel Dis 2009 |
Databáze: | OpenAIRE |
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