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Streptococcus thermophilus NCIMB 41856 ameliorates signs of colitis in an animal model of inflammatory bowel disease

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)605-614
Number of pages10
JournalBeneficial Microbes
Volume8
Issue number4
Early online date16 Jun 2017
DOIs
DateAccepted/In press - 5 Feb 2017
DateE-pub ahead of print - 16 Jun 2017
DatePublished (current) - Jul 2017

Abstract

Background: Treatment of inflammatorybowel disease (IBD) is mainly based on suppression of symptoms, often withnumerous side effects. Trials of probiotics in IBD have frequently produceddisappointing results. The majority of probiotics are unusual, since they donot require iron for growth, unlike many bacteria resident in the intestine.The IBD intestine is iron-rich due to bleeding and use of oral iron supplements;conventional probiotics would be rapidly outcompeted. We have evaluated aniron-responsive Streptococcusthermophilus strain for its potential to reduce signs of colitis.

Methods: Efficacy of S. thermophilus was evaluated in the dextran sodium sulphate (DSS)mouse model of colitis. Treated animals were given 1x108 cfu S. thermophilus per day and clinicalobservations were taken daily. At termination, gross and histopathologicalsigns of disease, cellular infiltration, location of bacteria, and cytokineexpression in the intestine were determined.

Results: S. thermophilus delayed onset of colitis and reduced clinical signsof disease, including bodyweight loss and gastrointestinal bleeding. It reducedbacterial translocation into the colonic tissue. Increased numbers of CD8+intraepithelial lymphocytes were seen in control animals treated with S. thermophilus. S. thermophilus had no effect on gross pathology, histopathology orcytokine production in either colitic or control animals.

Conclusions: We propose that S. thermophilus promotes maintenance of mucosalbarrier function which reduces bacterial translocation, thereby reducing immunestimulation and associated inflammation. This allows mucosal healing, reducinggastrointestinal bleeding and weight loss. This could be studied as alocally-acting adjunct or alternative to current IBD treatments.

    Research areas

  • Probiotic, epithelial barrier function, gastrointestinal bleeding

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Wageninen Academic Publishers at http://www.wageningenacademic.com/doi/abs/10.3920/BM2016.0110. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 419 KB, PDF document

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