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Scientists target possible cause of 1 form of bowel disease
Date:8/2/2010

COLUMBUS, Ohio A possible cause of irritable bowel syndrome has been traced to a small piece of RNA that blocks a substance protecting the colon membrane, leading to hostile conditions that can produce diarrhea, bloating and chronic abdominal pain.

New research shows that this RNA segment sends signals that stop the activity of the gene that produces glutamine, an amino acid. Previous research has linked a shortage of glutamine in the gut with the seepage of toxins and bacteria through the intestinal wall, irritating nerves and creating disease symptoms.

Scientists say that trying to generate glutamine in the disordered bowel by silencing this RNA segment could open up a whole new way of thinking about treating the diarrhea-predominant type of irritable bowel syndrome (IBS). In the meantime, they are making plans to conduct a clinical trial to see if glutamine supplements could also reduce common IBS symptoms.

This form of the disorder is characterized by diarrhea and bloating as well as chronic abdominal pain that is difficult to treat. About a third of IBS patients have the diarrhea-predominant type, another third experience consistent constipation, and the rest experience alternating bouts of diarrhea and constipation.

In the Ohio State University study, researchers observed that in human tissue samples, the presence of this small piece of RNA was associated with reduced activity by the gene that produces glutamine. Lower levels of glutamine were seen only in tissue samples from patients with the diarrhea-predominant type of IBS.

A group of these patients also had a condition called increased intestinal permeability, which allows toxins and bacteria into the colon that typically can't get in. The resulting irritation to nerves in the colon is believed to contribute to diarrhea and abdominal pain. The finding suggests that the glutamine deficiency is connected to the increased intestinal permeability, which dram
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Contact: QiQi Zhou
zhou.214@osu.edu
614-688-5775
Ohio State University
Source:Eurekalert

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