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. 1985 Feb;47(2):534–539. doi: 10.1128/iai.47.2.534-539.1985

Modulation of in vitro natural cell-mediated activity against enteropathogenic bacteria by simple sugars.

L Nencioni, L Villa, D Boraschi, A Tagliabue
PMCID: PMC263204  PMID: 3967926

Abstract

Lymphoid cells from mouse Peyer's patches and spleens were tested in a 2-h in vitro assay for their natural activity against the enteropathogenic bacteria Salmonella typhimurium, Salmonella enteritidis, Salmonella tel aviv, and Shigella sp. X16. The antibacterial activity expressed by normal cells was detected against all the bacterial strains tested with the exception of Peyer's patch lymphocytes against S. tel aviv and splenocytes against Shigella sp. X16. To determine whether the different expression of natural antibacterial activity might be due to lectin-like proteins interacting with the saccharidic moieties of the bacterial wall, 11 simple sugars were preincubated with the effector cells before the in vitro assays. We found that some of them could block the natural antibacterial activity as well as induce antibacterial activity when this was not spontaneously expressed. Interestingly, a different panel of sugars among those employed was observed to affect the antibacterial activities for each of the above-mentioned bacterial targets and each effector cell. However, the same panel of sugars was able to block or stimulate the lymphocyte activity when bacteria with the same somatic antigens as two substrains of S. typhimurium and one strain of Salmonella schottmuelleri were employed. To further investigate the interaction between effector cells and bacteria, effector cells or Shigella sp. X16 targets were treated with proteolytic, glycolytic, and lipolytic enzymes before the in vitro assays. Furthermore, EDTA was used to analyze the role of divalent cations in this experimental system. The results obtained suggest that lectin-like proteins playing a role in this interaction are present not only on lymphocytes but also on bacteria and that divalent cations are essential for the expression of in vitro antibacterial activity.

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Selected References

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