Effect of Oral Administration ofButyrivibrio fibrisolvensMDT-1 on Experimental Enterocolitis in Mice

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Abstract
Butyrivibrio fibrisolvensMDT-1, a butyrate-producing strain, was evaluated for use as a probiotic to prevent enterocolitis. Oral administration of the MDT-1 strain (109CFU/dose) alleviated the symptoms of colitis (including body weight loss, diarrhea, bloody stool, organic disorder, and mucosal damage) that are induced in mice drinking water that contains 3.0% dextran sulfate sodium. In addition, myeloperoxidase (MPO) activity levels in colonic tissue were reduced, suggesting that MDT-1 mitigates bowel inflammation. The addition of MDT-1 culture supernatant inhibited the growth of nine clinical isolates ofCampylobacter jejuniandCampylobacter colithat could potentially cause enterocolitis. Infection of mice withC. coli11580-3, one of the isolates inhibited by MDT-1 in vitro, resulted in diarrhea, mucosal damage, increased MPO activity levels in colonic tissue, increased numbers ofC. coliin the cecum, and decreased body weight gain. However, administration of MDT-1 to mice, prior to and duringC. coliinfection, reduced these effects. These results suggest thatCampylobacter-induced enterocolitis can be alleviated by usingB. fibrisolvensas a probiotic.