The effect of Lactobacillus rhamnosus on enterohemorrhagic Escherichia coli infection of human intestinal cells in vitro

Jyunko Hirano, Tomoaki Yoshida, Tsuyoshi Sugiyama, Naoki Koide, Isamu Mori, Takashi Yokochi

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

There are many examples of probiotic effects of various lactic bacteria on enteropathogens. In this study, Lactobacillus strains (L. rhamnosus, L. gasseri, L. casei and L. plantarum) were tested in an in vitro model of enterohemorrhagic Escherichia coli (EHEC) infection of a human colon epithelial cell line, C2BBe1. While the adhesion and colonization of EHEC was not affected by any of the lactobacillus strains tested, the internalization of EHEC into the cell line was markedly suppressed by L. rhamnosus, though not by others. Concerning the possible mechanisms, the viabilities of EHEC and host cell were not affected by the presence of L. rhamnosus. Simple competitions at certain receptors were unlikely because the suppressive effect on EHEC internalization was strictly dependent on viable L. rhamnosus and could not be observed with the conditioned medium or killed L. rhamnosus. The fact that L. rhamnosus showed outstanding potential for adhering to the colon epithelial cell line, compared with other strains, suggested that an avid interaction between L. rhamnosus and the host cell might be modulating intra-cellular events responsible for the internalization of EHEC.

Original languageEnglish
Pages (from-to)405-409
Number of pages5
JournalMICROBIOLOGY and IMMUNOLOGY
Volume47
Issue number6
DOIs
Publication statusPublished - 2003

All Science Journal Classification (ASJC) codes

  • Microbiology
  • Immunology
  • Virology

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