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  • Author or Editor: K. Szeker x
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Adhesion of Lactobacillus casei subsp. pseudoplantarum 2750, Lactobacillus sakei DSM 20017 and Bifidobacterium bifidum B3.2 to Caco-2 cell line was investigated in vitro. The adhesion ability of the tested strains was quantified with three methods: fluorescent-labelling, Gram-staining — followed by cell counting and image analysis — and plate count enumeration in order to compare the different detection methods. Results were in good correlation in terms of number of adhered bacteria, however, aggregate formation resulted in a significantly lower result with plate count enumeration in case of L. casei subsp. pseudoplantarum 2750. Percent coverage was found to be an appropriate method to compare adhesion ability of the strains, provided the cell sizes are similar. Gram-staining gives satisfactory results, however, fluorescent staining was not a suitable method in this study, since fluorescent dye hexidium iodide also labelled the intestinal cells.

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Authors: E. Paszti-Gere, E. Csibrik-Nemeth, K. Szeker, R. Csizinszky, O. Palocz, O. Farkas and P. Galfi

Recently, there has been a growing interest to replace antibiotics’ administration with the application of probiotics. The aim of our investigations was to reveal the influence of spent culture supernatant of Lactobacillus plantarum 2142 on the response of enterocytes to oxidative stress, and the spent culture supernatant’s ability to protect them from oxidative injury. The experiments were performed on non-carcinogenic porcine epithelial cell line, IPEC-J2 isolated from a neonatal piglet and on human colon adenocarcinoma cell line, Caco-2. The cells cultured on membrane inserts were treated with millimolar hydrogen peroxide solution to provoke oxidative stress. The peroxide-triggered cell response profile was evaluated via determination of change in transepithelial electrical resistance, quantification of extent of cell death by 4’,6-diamidino-2 phenylindole (DAPI) staining and via estimation of proinflammatory cytokine, IL-8 production using ELISA technique. Non-starter lactobacilli supernatant-mediated inhibition of peroxide-triggered upregulation of IL-8 production confirmed the antiinflammatory properties of active metabolites produced by Lactobacillus plantarum 2142 in acute oxidative stress.

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Authors: K. Szekér, J. Beczner, A. Halász, Á. Mayer, J.M. Rezessy-Szabó and P. Gálfi

The adhesion of twenty-six Lactobacillusstrains to two intestinal cell lines (Caco-2P and IEC-18) and 21 Bifidobacteriumstrains to Caco-2P cells was investigated. Non-specific adherence was determined on the surface of culture plates. The effect of short chain fatty acids (SCFA) on epithelial cells, and bacterial adhesion were investigated by Na-n-butyrate treatment. The adherence of LAB and bifidobacteria greatly varied in a strain-dependent manner. The adherence of LAB was better to IEC-18 cells than to Caco-2P cells, and bifidobacteria adhered better to Caco-2P cells than the LAB. Some strains adhered well or even better to the background than to the cells, which queries the specificity of adhesion of these strains. Na-n-butyrate treatment stimulated the differentiation of IEC-18 cells and therefore increased the number of adherent bacteria, probably because only the cell surface increased not the number of epitopes.

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