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Appl Environ Microbiol. 1989 July; 55(7): 1848-1851

Lactobacilli and bile salt hydrolase in the murine intestinal tract.

G W Tannock, M P Dashkevicz and S D Feighner

Department of Microbiology, University of Otago, Dunedin, New Zealand.

ABSTRACT

Mice that have a complex intestinal microflora but that do not harbor lactobacilli were used to determine the contribution of lactobacilli to the total bile salt hydrolase activity in the murine intestinal tract. Bile salt hydrolase activity in the ileal contents of these mice was reduced 86% in the absence of lactobacilli and by greater than 98% in the absence of lactobacilli and enterococci compared with samples from conventional mice. Bile salt hydrolase activities were lower in ileal and cecal contents from lactobacillus-free mice colonized with enterococci than in samples from lactobacillus-free mice colonized with lactobacilli. Bile salt hydrolase activity in the duodena, jejuna, ilea, and ceca of reconstituted lactobacillus-free mice colonized by lactobacilli was similar to that in samples from the intestinal tracts of conventional mice. We conclude from these studies that lactobacilli are the main contributors to total bile salt hydrolase activity in the murine intestinal tract.

Appl Environ Microbiol. 1989 July; 55(7): 1848-1851




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