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19.12.2016 | Original Article

Effects of Ex Vivo Infection with ETEC on Jejunal Barrier Properties and Cytokine Expression in Probiotic-Supplemented Pigs

verfasst von: Ulrike Lodemann, Salah Amasheh, Judith Radloff, Martina Kern, Astrid Bethe, Lothar H. Wieler, Robert Pieper, Jürgen Zentek, Jörg R. Aschenbach

Erschienen in: Digestive Diseases and Sciences | Ausgabe 4/2017

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Abstract

Background and Aim

Enterotoxigenic Escherichia coli (ETEC) strains are involved in piglet post-weaning diarrhea. Prophylactic measures including probiotics have been examined in infection experiments with live piglets. In the present study, we have tested whether the early effects of ETEC infection can also be evoked and studied in a model in which ETEC is added to whole mucosal tissues ex vivo, and whether this response can be modulated by prior supplementation of the piglets with probiotics.

Methods

Jejunal barrier and transport properties of Enterococcus faecium-supplemented or control piglets were assessed in Ussing chambers. Part of the epithelia was challenged with an ETEC strain at the mucosal side. Fluxes of fluorescein as a marker of paracellular permeability, and the expression of selected tight junction (TJ) proteins and of proinflammatory cytokines were measured.

Results

The addition of ETEC ex vivo induced an increase in transepithelial resistance peaking in the first 2 h with a concomitant reduction in fluorescein fluxes, indicating tightening effects on barrier function. The response of short-circuit current after stimulation with PGE₂ or glucose was reduced in epithelia treated with ETEC. ETEC induced a decrease in the TJ protein claudin-4 in the control diet group after 280 min and an increase in the mRNA expression of the proinflammatory cytokines interleukin-8 and TNF-α in both groups after 180 min.

Conclusions

The addition of ETEC ex vivo affected barrier function and transport properties of the jejunal tissues and enhanced cytokine expression. The differences in claudin-4 expression in the jejunum might indicate a beneficial effect of E. faecium prefeeding.

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Titel: Effects of Ex Vivo Infection with ETEC on Jejunal Barrier Properties and Cytokine Expression in Probiotic-Supplemented Pigs
verfasst von: Ulrike Lodemann
Salah Amasheh
Judith Radloff
Martina Kern
Astrid Bethe
Lothar H. Wieler
Robert Pieper
Jürgen Zentek
Jörg R. Aschenbach
Publikationsdatum: 19.12.2016
Verlag: Springer US
Erschienen in: Digestive Diseases and Sciences / Ausgabe 4/2017
Print ISSN: 0163-2116
Elektronische ISSN: 1573-2568
DOI: https://doi.org/10.1007/s10620-016-4413-x

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