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Gut Bacteria Fights Inflammatory Bowel Disease
Date:5/28/2008

Mouse study finds molecule boosted cells eliminating colitis, Crohn's symptoms

WEDNESDAY, May 28 (HealthDay News) -- A molecule produced by intestinal bacteria can eliminate symptoms of inflammatory bowel disease (IBD) in mice, U.S. researchers say.

IBD includes Crohn's disease and ulcerative colitis.

It has long been known that the guts of humans and other mammals contain about 1,000 different species of bacteria that protect against infection and aid digestion. It has also been suspected that recent increases in asthma and certain food allergies may be due to disruptions in the delicate balance of the intestinal ecosystem, according to background information in the study.

Previous research has found that the sugar molecule polysaccharide A (PSA), which is produced by a species of intestinal bacteria called Bacteroides fragilis, boosted levels of immune system cells known to protect against colitis and Crohn's.

In this new study, researchers at Harvard Medical School, Brigham and Women's Hospital, and the California Institute of Technology infected immune-suppressed mice with a harmful bacteria called Helicobacter hepaticus. The mice quickly developed IBD.

But when B. fragilis was combined with H. hepaticus, the mice remained healthy. Further tests revealed that PSA produced by B. fragilis was a key factor in preventing IBD. The molecule does this by prompting immune cells to secrete an anti-inflammatory interleukin called IL-10, which suppresses the inflammation caused by IBD.

This is the first time a beneficial molecule produced by intestinal bacteria has been shown to be therapeutic in an animal model. The study is published in the May 29 issue of Nature.

The researchers said their finding demonstrates the potential for "good" bacteria to benefit human health.

"Given the sheer number of bacteria in the gut, the potentia
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