Campylobacter concisus is prevalent in the gastrointestinal tract of patients with microscopic colitis.

Autor: Yde Aagaard ME; Department of Infectious Diseases, Aalborg University Hospital, Aalborg, Denmark.; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark., Frahm Kirk K; Department of Infectious Diseases, Aalborg University Hospital, Aalborg, Denmark., Linde Nielsen H; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.; Department of Clinical Microbiology, Aalborg University Hospital, Aalborg, Denmark., Harder Tarpgaard I; Department of Clinical Microbiology, Aalborg University Hospital, Aalborg, Denmark., Bach Hansen J; Department of Gastroenterology, Aalborg University Hospital, Aalborg, Denmark., Nielsen H; Department of Infectious Diseases, Aalborg University Hospital, Aalborg, Denmark.; Department of Clinical Medicine, Aalborg University, Aalborg, Denmark.
Jazyk: angličtina
Zdroj: Scandinavian journal of gastroenterology [Scand J Gastroenterol] 2020 Aug; Vol. 55 (8), pp. 924-930. Date of Electronic Publication: 2020 Jul 15.
DOI: 10.1080/00365521.2020.1792976
Abstrakt: Objectives: Microscopic colitis (MC) is potentially induced by an inflammatory reaction to a luminal gut factor. The emerging pathogen Campylobacter concisus is associated with prolonged diarrhoea and subsequently increased risk of MC. We aimed to examine the prevalence of C. concisus in clinical samples from MC patients, analyse the subtypes collagenous colitis (CC) and lymphocytic colitis (LC), and characterise C. concisus isolates from MC patients by genomic sequencing.
Methods: Mucosal biopsies were collected by sigmoidoscopy in 55 MC patients (CC n  = 34, LC n  = 21). Saliva and faecal samples were also collected. A two-step cultivation method and PCR established C. concisus prevalence. Biopsy and faecal isolates were sequenced for genomic analysis.
Results: Cultivation revealed C. concisus in saliva 55/55, faeces 14/55 and biopsies 69/436, which was confirmed by PCR in faeces 28/55 and biopsies 215/430. Interestingly, biopsy prevalence was higher in CC patients than in LC patients both by cultivation (50/270 vs.19/166, p  = .058) and by PCR (175/270 vs. 40/160, p  < .0001). Long disease duration also affected biopsy prevalence both by cultivation 30/244 (<2 years) vs. 39/192 (>2 years) ( p  = .025) and by PCR 103/239 (<2 years) vs. 112/191 (>2 years) ( p  = .002). Genomic analysis on sixty biopsy and twenty faecal isolates revealed division into two clusters/genomospecies and a high presence of various, putative virulence genes ( zot , exotoxin 9 and hcp ).
Conclusions: Campylobacter concisus was prevalent in MC patients. Interestingly, the biopsy prevalence differed in biopsies from CC and LC patients and with regard to disease duration. Further studies are needed to elucidate this possible association.
Databáze: MEDLINE
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