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The putative role of the intestinal microbiota in the irritable bowel syndrome





Dig Liver Dis. 2009 Sep 7. [Epub ahead of print]


The putative role of the intestinal microbiota in the irritable bowel syndrome.


Collins S, Denou E, Verdu E, Bercik P. The Farncombe Digestive Health Research Institute, The Faculty of Health Sciences, McMaster University, Hamilton, Ontario, Canada L8N 3Z5.



The irritable bowel syndrome (IBS) is a chronic abdominal symptom complex that is heterogeneous in terms of its clinical presentation and underlying pathophysiology and pathogenesis. It is now established that enteric infection can trigger the syndrome in at least a subset of patients. In addition, there is growing evidence of low grade inflammation and immune activation in the distal bowel of some IBS patients. These observations now prompt the question as to what maintains gut dysfunction in these patients. The intestinal microbiota influences a broad array of host organs that include the gut and the brain, and is an important determinant of normal function in these systems. Disruption of the delicate balance between the host and its intestinal microbiota (termed dysbiosis) results in changes in the mucosal immune system that range from overt inflammation as seen in Crohn's Disease, to low grade inflammation without tissue injury, as seen in a subset of IBS patients. Under experimental conditions, disruption of the microbiota also produces changes in gut sensory-motor function and immune activity. Thus, dysbiosis induced by infection, dietary change or drugs such as antibiotics could produce low grade inflammation and chronic gut dysfunction, reminiscent of that seen in IBS. Fluctuations in gut physiology destabilize the habitat of commensal bacteria and provide a basis for chronic dysbiosis. Recent observations in animal models that changes in gut flora influence behavior provide a basis for a novel unifying hypothesis that accommodates both gut dysfunction and behavioral changes that characterize many IBS patients. This hypothesis states that dysbiosis exists in at least a subset of IBS patients, as a result of infection, dietary change or drugs and contributes to gut inflammatory and functional change in addition to psychiatric co-morbidity.


PMID: 19740713 [PubMed - as supplied by publisher]









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  • This study represents an important hypothesis that explains both the gastrointestinal and brain related symptoms, such as cognitive deficits and mood disorders, in some irritable bowel syndrome (IBS) patients are associated with gut dysbiosis. Further evidence that the gut microflora (beneficial/probiotic bacteria and other microorganisms that inhabit the gut) play a central role in maintaining optimal functioning of both the brain and nervous system and the immune system.

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