Proinflammatory Sulfur-Reducing Bacteria Are More Abundant in Colonic Biopsies of Patients with Microscopic Colitis Compared to Healthy Controls View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

2019-02

AUTHORS

Valentine Millien, Daniel Rosen, Jason Hou, Rajesh Shah

ABSTRACT

BACKGROUND: Microscopic colitis (MC), a subtype of inflammatory bowel disease, is a chronic condition of unknown etiology. Recent evidence has linked MC with intriguing changes in the stool microbiota, which may be linked to disease pathogenesis. The composition of the mucosal microbiome in patients with MC remains unclear. METHODS: We performed a cross-sectional study comparing colonic tissue samples from patients with MC to those of healthy controls at the Michael E. DeBakey VA Medical Center. We included adults older than 18 who underwent a colonoscopy with biopsies to evaluate chronic diarrhea. Cases were defined by histology consistent with MC and controls by the absence of histologic disease. We conducted structured chart review to exclude other gastrointestinal diseases and obtain demographic (age, sex, race) and clinical (duration of symptoms and concurrent medications) information for cases and controls. We extracted bacterial DNA from formalin-fixed paraffin-embedded tissue samples and sequenced the v4 region of the 16S rRNA gene. Operational taxonomic unit (OTU) clustering was performed using UPARSE, and OTUs were assigned using the SILVA database. Statistical analysis was performed in QIIME and LEfSe. Comparisons with FDR-adjusted p values of less than 0.05 were considered statistically significant. RESULTS: We included 20 MC patients and 20 controls with mean ages of 62 and 54, respectively. Most cases were White (95%), 60% had symptoms for greater than 12 months, and 50% were taking PPIs and NSAIDs at the time of their diagnosis. Compared to controls, MC patients had a significant increase in the proinflammatory sulfur-reducing bacterial family Desulfovibrionales. The Coriobacteriaceae family, abundant in the healthy gut, was significantly decreased in MC cases. There was also an increase in the genus Actinomyces in MC patients on PPI and an increase in the class Bacilli among those taking NSAIDs. DISCUSSION: Patients with MC have an increase in the proinflammatory family Desulfovibrionales. Actinomyces and Bacilli were associated with medications (PPI and NSAID) known to increase the risk of MC. Our findings may have important implications for understanding the pathogenesis of MC. More... »

PAGES

432-438

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/s10620-018-5313-z

DOI

http://dx.doi.org/10.1007/s10620-018-5313-z

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1107637702

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/30324555


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57 schema:description BACKGROUND: Microscopic colitis (MC), a subtype of inflammatory bowel disease, is a chronic condition of unknown etiology. Recent evidence has linked MC with intriguing changes in the stool microbiota, which may be linked to disease pathogenesis. The composition of the mucosal microbiome in patients with MC remains unclear. METHODS: We performed a cross-sectional study comparing colonic tissue samples from patients with MC to those of healthy controls at the Michael E. DeBakey VA Medical Center. We included adults older than 18 who underwent a colonoscopy with biopsies to evaluate chronic diarrhea. Cases were defined by histology consistent with MC and controls by the absence of histologic disease. We conducted structured chart review to exclude other gastrointestinal diseases and obtain demographic (age, sex, race) and clinical (duration of symptoms and concurrent medications) information for cases and controls. We extracted bacterial DNA from formalin-fixed paraffin-embedded tissue samples and sequenced the v4 region of the 16S rRNA gene. Operational taxonomic unit (OTU) clustering was performed using UPARSE, and OTUs were assigned using the SILVA database. Statistical analysis was performed in QIIME and LEfSe. Comparisons with FDR-adjusted p values of less than 0.05 were considered statistically significant. RESULTS: We included 20 MC patients and 20 controls with mean ages of 62 and 54, respectively. Most cases were White (95%), 60% had symptoms for greater than 12 months, and 50% were taking PPIs and NSAIDs at the time of their diagnosis. Compared to controls, MC patients had a significant increase in the proinflammatory sulfur-reducing bacterial family Desulfovibrionales. The Coriobacteriaceae family, abundant in the healthy gut, was significantly decreased in MC cases. There was also an increase in the genus Actinomyces in MC patients on PPI and an increase in the class Bacilli among those taking NSAIDs. DISCUSSION: Patients with MC have an increase in the proinflammatory family Desulfovibrionales. Actinomyces and Bacilli were associated with medications (PPI and NSAID) known to increase the risk of MC. Our findings may have important implications for understanding the pathogenesis of MC.
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