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KMID : 1234420080360020121
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Korean Journal of Microbiololgy and Biotechnology
2008 Volume.36 No. 2 p.121 ~ p.127
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Potential Probiotic Properties of Lactobacillus johnsonii IDCC 9203 Isolated from Infant Feces
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Lee Seung-Hun
Yang Eun-Hee
Kwon Hyuk-Sang
Kang Jae-Hoon
Kang Byung-Hwa
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Abstract
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A strain IDCC 9203 isolated from infant feces was identified as Lactobacillus johnsonii on the basis of 16S rDNA sequence analysis. L. johnsonii IDCC 9203 was highly resistant to acid (MRS broth at pH 2.3) and bile (MRS broth with 0.3% oxgall). The antibacterial activities of L. johnsonii IDCC 9203 was examined against Salmonella typhimurium KCTC 2054. The growth of S. typhimurium KCTC 2054 was inhibited by the cell-free culture supernatant (at pH 4.0) of L. johnsonii IDCC 9203 as well as by the respective control (MRS broth at pH 4.0). Antimicrobial effect against S. typhimurium KCTC 2054 of L. johnsonii IDCC 9203 was probably due to the lactic acid. By an in vitro cell adhesion model, L. johnsonii IDCC 9203 preincubated or coincubated with Caco-2 cells reduced the adhesion of S. typhimurium KCTC 2054 to Caco-2 cells by 74% or 47.1%, respectively. Also in an in vivo model, L. johnsonii IDCC 9203 was colonized in mice intestines which were disrupted by ampicillin treatment. Its proliferation in the mice intestines reduced abnormal salmonella growth from 109 CFU/g feces to 105 CFU/g feces as an indigenous level. The results obtained in this study suggest that L. johnsonii IDCC 9203 may be a potential probiotic strain.
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KEYWORD
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Lactobacillus johnsonii, Salmonella typhimurium, probiotics, Caco-2 cells
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