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- W1838874421 abstract "Preparations of lactobacilli are often used as dietary supplements to improve the growth and efficiency in utilizing food of animals of commercial value. We tested in an experimental model whether the effects of lactobacilli on growth of and food utilization by animals may be due to alteration of the activities of absorptive enzymes in the small bowel. Germfree mice housed in isolators under tightly controlled conditions were monoassociated with one of four strains of indigenous Lactobacillus spp. From 1 to 5 weeks later, the activity of alkaline phosphatase was assayed in homogenates of segments of the upper small intestines of the associated animals and of matched germfree controls. The specific activity of the enzyme was the same in the mice in the two groups. In other experiments, epithelial cells were isolated from the upper small intestines of mice associated with eight Lactobacillus strains (octa-associated) and from those of matched germfree mice and assayed for alkaline phosphatase, phosphodiesterase, and thymidine kinase activities. The epithelial cells were harvested sequentially from the tips of the villi toward the crypts of Lieberkühn of the intestines. In all preparations, mice of both types yielded an equivalent mass (wet weight) of cells. The protein content of the cells reflected the mass. The activities of the microvillous membrane enzymes alkaline phosphatase and phosphodiesterase and the cytosol enzyme thymidine kinase were the same whether or not the animals contained the bacteria. Therefore, any effects on animal growth and food utilization observed when lactobacilli are used as dietary supplements may not be due to a direct alteration by the bacteria of the absorptive enzymes of the host animal.(ABSTRACT TRUNCATED AT 250 WORDS)" @default.
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- W1838874421 date "1987-02-01" @default.
- W1838874421 modified "2023-09-25" @default.
- W1838874421 title "Lactobacilli as effectors of host functions: no influence on the activities of enzymes in enterocytes of mice" @default.
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- W1838874421 doi "https://doi.org/10.1128/aem.53.2.325-330.1987" @default.
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