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J Transl Med. 2018 Dec 17;16(1):359. doi: 10.1186/s12967-018-1723-0.

Clinical significance of soluble immunoglobulins A and G and their coated bacteria in feces of patients with inflammatory bowel disease.

Author information

1
Department of Gastroenterology, The Shanghai Tenth People's Hospital of Tongji University, No. 301 Yanchang Road, Shanghai, 200072, China.
2
Department of Gastroenterology, Luoyang Central Hospital Affiliated to Zhengzhou University, No. 288 Middle Zhongzhou Road, Luoyang, 471009, Henan Province, China.
3
Department of Gastroenterology, Suzhou Municipal Hospital Affiliated to Nanjing Medical University, Suzhou, 215008, China.
4
Department of Gastroenterology, The Shanghai Tenth People's Hospital of Tongji University, No. 301 Yanchang Road, Shanghai, 200072, China. wuwei_1125@126.com.
5
Department of Gastroenterology, The Shanghai Tenth People's Hospital of Tongji University, No. 301 Yanchang Road, Shanghai, 200072, China. liuzhanju88@126.com.
6
Department of Gastroenterology, The Shanghai Tenth People's Hospital Chongming Branch, No. 66 Xiangyang East Road, Chongming, 202157, China. liuzhanju88@126.com.

Abstract

BACKGROUND:

Immunoglobulin A (IgA) and IgG are major components in human intestinal mucosal surface and sera, and IgA- or IgG-coated bacteria play a vital role in the intestinal homeostasis. However, the correlation of IgA, IgG and their coated bacteria with the clinical characteristics of inflammatory bowel disease (IBD) has not been fully clarified.

METHODS:

The levels of soluble IgA and IgG in sera and feces were detected by ELISA, and the percentage of IgA- and IgG-coated bacteria in feces was analyzed by flow cytometry. Crohn's disease activity index (CDAI) and Simple Endoscopic Score for Crohn's disease (SES-CD) for Crohn's disease (CD) or Mayo score and ulcerative colitis endoscopic index of severity (UCEIS) for ulcerative colitis (UC), erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) were used to evaluate the disease activity.

RESULTS:

178 patients with CD, 75 patients with UC and 41 healthy donors were recruited in this study. We found that the concentrations of soluble IgA and IgG in feces of active IBD patients were significantly higher than those in healthy controls and that the levels of soluble IgA and IgG in feces from IBD patients were positively correlated with CRP, ESR, Mayo score, UCEIS, SES-CD, and CDAI, respectively. Moreover, we also observed that the percentage of IgA- and IgG-coated bacteria markedly increased in feces of IBD patients, especially in CD patients at the age of 17 to 40 years old, with terminal ileal lesions and perianal lesions, as well as from E2 UC patients, and was closely associated with disease activities.

CONCLUSIONS:

The levels of soluble IgA and IgG and the percentage of IgA- and IgG-coated bacteria strikingly increase in feces of IBD patients and correlate with disease activity.

KEYWORDS:

Disease activity; Immunoglobulin A; Immunoglobulin G; Inflammatory bowel disease

PMID:
30558634
PMCID:
PMC6296095
DOI:
10.1186/s12967-018-1723-0
[Indexed for MEDLINE]
Free PMC Article

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