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Lymphocytes, located within the Peyer's patches, might be involved in the dissemination of enteropathogenic Salmonella typhimurium and Yersinia enterocolitica bacteria. To test this hypothesis, we have investigated the susceptibility of human B- and T-cell lines to bacterial adhesion and invasion. The two S. typhimurium strains analyzed were highly invasive, while the two Y. enterocolitica (O:8) strains adhered to the B- and T-cell lines but did not enter the cell lines in significant amounts. We hypothesize that the incapability of the Y. enterocolitica (O:8) strains to enter the human B- and T-cell lines is most probably due to the bacterial inability to induce the internalization process upon adhesion to both cell lines. Although immortalized B- and T-cell lines were used in this study, the results presented suggest the possibility that both cell types could play a role in the dissemination of intracellularly residing S. typhimurium in vivo.

Entrance and survival of Salmonella typhimurium and Yersinia enterocolitica within human B- and T-cell lines