Immunoglobulin coating of faecal bacteria in inflammatory bowel disease.

Abstract:

OBJECTIVE:An inappropriate mucosal immune response to the commensal bacterial flora may play a role in the pathogenesis of inflammatory bowel disease (IBD). In this study we determined the percentage of immunoglobulin-coated bacteria in the stools of patients and controls. METHODS:Faecal samples were obtained from 18 patients with IBD (one sample during exacerbation and one shortly after remission was achieved), 15 healthy volunteers, eight infectious colitis patients, and 13 IBD patients in long-term remission. Bacterial immunoglobulin coating was determined by flow-cytometry analysis. Faecal alpha-1-antitrypsin concentrations were determined by radial immune diffusion. RESULTS:IBD patients had 69 +/- 19% immunoglobulin A (IgA)-, 56 +/- 32% immunoglobulin G (IgG)- and 56 +/- 29% immunoglobulin M (IgM)-coated bacteria in their faeces. Healthy controls had less immunoglobulin coating, respectively 36 +/- 12%, 11 +/- 4% and 11 +/- 7%. Infectious colitis patients had 57 +/- 14% IgA, 31 +/- 13% IgG, and 42 +/-16% IgM; however, they had higher faecal alpha-1-antitrypsin concentrations than IBD patients. Shortly after remission, IBD patients had 65 +/- 20% IgA, 32 +/- 18% IgG and 40 +/- 21% IgM. Long-term-remission IBD patients had normal IgG and IgM but increased IgA (50 +/- 16%) coating. CONCLUSIONS:Compared with healthy controls, patients with IBD had an increased percentage of immunoglobulin-coated faecal anaerobic bacteria, both in active disease and shortly after remission. These results support the concept that there may be a breakdown of mucosal tolerance to the commensal gut flora in IBD.

authors

van der Waaij LA,Kroese FG,Visser A,Nelis GF,Westerveld BD,Jansen PL,Hunter JO

doi

10.1097/01.meg.0000108346.41221.19

subject

Has Abstract

pub_date

2004-07-01 00:00:00

pages

669-74

issue

7

eissn

0954-691X

issn

1473-5687

pii

00042737-200407000-00007

journal_volume

16

pub_type

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