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The Human Mesenteric Lymph Node Microbiome Differentiates Between Crohn's Disease and Ulcerative Colitis.
Miranda G Kiernan1, J Calvin Coffey1,2, Kieran McDermott1
1Graduate Entry Medical School and Centre for Interventions in Infection, Inflammation & Immunity [4i], University of Limerick, Limerick, Ireland.
Journal of Crohn'S & Colitis
|September 22, 2018
Summary
The gut microbiome in mesenteric lymph nodes differs between Crohn's disease and ulcerative colitis patients. These distinct bacterial profiles may help diagnose inflammatory bowel disease types.
Area of Science:
- Gastroenterology
- Microbiology
- Immunology
Background:
- Mesenteric lymph nodes are crucial sites for immune responses to translocated bacteria.
- Understanding the mesenteric lymph node microbiome is vital in inflammatory bowel disease (IBD) research.
- Previous studies on Crohn's disease mesenteric lymph node bacteria are limited.
Purpose of the Study:
- To investigate and compare the mesenteric lymph node microbiota in Crohn's disease (CD) and ulcerative colitis (UC) patients.
- To identify distinct bacterial profiles associated with different IBD subtypes.
Main Methods:
- Mesenteric lymph nodes were collected from CD and UC patients during resection.
- Bacterial DNA (16S) was extracted and quantified.
- Next-generation sequencing was used to identify bacterial phyla and species.
Main Results:
- Distinct microbial profiles were observed between CD and UC mesenteric lymph nodes.
- Firmicutes were more abundant in UC, while Proteobacteria were more abundant in CD.
- CD lymph nodes showed reduced species diversity but increased abundance of Fusobacteria.
Conclusions:
- Significant differences exist in the mesenteric lymph node microbiomes of CD and UC patients.
- These microbial signatures could potentially aid in diagnosing CD versus UC, especially in indeterminate colitis.
- The findings may offer insights into the pathogenesis and progression of IBD.