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The Effect of Lactobacillus rhamnosus on Enterohemorrhagic Escherichia coli Infection of Human Intestinal Cells In Vitro
Author(s) -
Hirano Jyunko,
Yoshida Tomoaki,
Sugiyama Tsuyoshi,
Koide Naoki,
Mori Isamu,
Yokochi Takashi
Publication year - 2003
Publication title -
microbiology and immunology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.664
H-Index - 70
eISSN - 1348-0421
pISSN - 0385-5600
DOI - 10.1111/j.1348-0421.2003.tb03377.x
Subject(s) - lactobacillus rhamnosus , microbiology and biotechnology , biology , internalization , escherichia coli , probiotic , in vitro , lactobacillus casei , lactobacillus plantarum , lactobacillus gasseri , cell culture , cell , bacteria , lactic acid , biochemistry , genetics , gene
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.