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Appl Environ Microbiol. 1992 June; 58(6): 2034–2039.
PMCID: PMC195723

Protein-mediated adhesion of Lactobacillus acidophilus BG2FO4 on human enterocyte and mucus-secreting cell lines in culture.


The adhesion of Lactobacillus acidophilus BG2FO4, a human stool isolate, to two human enterocytelike cell lines (Caco-2 and HT-29) and to the mucus secreted by a subpopulation of mucus-secreting HT29-MTX cells was investigated. Scanning electron microscopy revealed that the bacteria interacted with the well-defined apical microvilli of Caco-2 cells without cell damage and with the mucus secreted by the subpopulation of HT29-MTX cells. The adhesion to Caco-2 cells did not require calcium and involved an adhesion-promoting factor that was present in the spent supernatant of L. acidophilus cultures. This factor promoted adhesion of poorly adhering human Lactobacillus casei GG but did not promote adhesion of L. casei CNRZ 387, a strain of dairy origin. The adherence components on the bacterial cells and in the spent supernatant were partially characterized. Carbohydrates on the bacterial cell wall appeared to be partly responsible for the interaction between the bacteria and the extracellular adhesion-promoting factor. The adhesion-promoting factor was proteinaceous, since trypsin treatment dramatically decreased the adhesion of the L. acidophilus strain. The adhesion-promoting factor may be an important component of Lactobacillus species that colonize the gastrointestinal tract.

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