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BMC Gastroenterol. 2019 Jan 14;19(1):10. doi: 10.1186/s12876-019-0930-3.

Role of colonic microbiota in the pathogenesis of ulcerative colitis.

Pei LY1,2, Ke YS3, Zhao HH1,2, Wang L4, Jia C1,2,5, Liu WZ1,2, Fu QH1,2, Shi MN1,2, Cui J1,2, Li SC6,7.

Author information

1
School of Pharmacy, Minzu University of China, 27 South Street, Zhongguancun, Beijing, 100081, China.
2
Key Laboratory of Ethnomedicine (Minzu University of China), Ministry of Education, Beijing, 100081, China.
3
Center for Drug Evaluation, China Food and Drug Administration, Beijing, 100081, China.
4
Department of Histology and Embryology, Xinxiang Medical University, Xinxiang, 453003, Henan, China.
5
Department of Pathology, Beijing Children's Hospital, Capital Medical University, National Center for Children's Health, Beijing, 100045, China.
6
School of Pharmacy, Minzu University of China, 27 South Street, Zhongguancun, Beijing, 100081, China. jason@muc.edu.cn.
7
Key Laboratory of Ethnomedicine (Minzu University of China), Ministry of Education, Beijing, 100081, China. jason@muc.edu.cn.

Abstract

BACKGROUND:

Recent studies have found gut microbiota to be closely associated with onset and perpetuation of UC. Currently, studies about gut microbiota have mainly covered samples collected from the intestinal lumen. However, the luminal flora is only part of the gut microbiota. Studies of the changes in mucosal flora under pathological conditions have been lacking. In this study, we investigated the correlation between the onset of UC and flora changes in different intestinal layers.

METHODS:

The dextran sulfate sodium(DSS)-induced UC model was established by exposing mice to cycles of DSS. The luminal contents, an inner mucus layer, and outer mucus layer were harvested under sterile conditions. The samples were then analyzed using high-throughput sequencing of 16S rRNA V3 + V4 amplicons. The colonic microbiota composition and diversity were analyzed and compared using MetaStat, LefSe, multivariate analysis of variance, and spatial statistics.

RESULTS:

The DSS-induced UC mouse model was successfully established. The diversity of the microbiota from luminal content, the outer mucus layer, and inner mucus layer were significantly different in both control and UC model groups. The statistically different OTUs belonged to Lachnospiraceae and Ruminococcaceae families within the order Clostridiales were mainly localized to the outer mucus layer.

CONCLUSIONS:

The alterations in flora composition and diversity mainly occurred in the colonic outer mucus layer. The change of flora in the colonic mucus layers is of great significance in the understanding of common features of gut flora in IBD and the understanding of the relationship between gut flora and disease progression.

KEYWORDS:

Intestinal microbiota; Microbiology; Ulcerative colitis

PMID:
30642266
PMCID:
PMC6332670
DOI:
10.1186/s12876-019-0930-3
[Indexed for MEDLINE]
Free PMC Article

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