Abstract
Purpose
The aim of this study was to investigate the effect of heat-killed yeast cells on the integrity of epithelial tight junctions in vitro.
Methods
Changes in barrier potential of Caco-2 cell monolayers were assessed by transepithelial electrical resistance (TEER) measurements and by an increasing permeability to a marker protein, horse–radish peroxidase (HRP). Visualisation of tight junction disruption was carried out directly through electron microscopy and indirectly through fluorescence confocal microscopy and immunoblotting of the tight junction-associated proteins zonula occludens ZO-1, occludin and actin.
Results
Yeast cells opened tight junctions in a reversible dose- and time-dependent manner, as shown by a decrease in TEER and an increase in HRP permeability. These changes to barrier potential were shown not to be due to cytotoxic effects but due to modulation of the tight junctions. ZO-1, actin and occludin proteins were demonstrated to be involved in yeast-induced tight junction opening through the use of confocal microscopy and western blotting. Electron microscopy confirmed a direct opening of tight junctions after application of yeast.
Conclusion
Yeast modulated epithelial tight junctions in a reversible manner by contraction of the actin cytoskeleton and shift of ZO-1 and occludin tight junction proteins from the membrane to cytoskeletal areas of the cell.
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Abbreviations
- DMEM:
-
dulbecco's modified eagle medium
- ECL:
-
enhanced chemiluminescence reagent
- EDTA:
-
disodium eth ylenediaminetetraacetate
- FCS:
-
foetal calf serum
- FITC:
-
fluorescein isothiocyanate
- HRP:
-
horse–radish peroxidase
- Papp :
-
apparent permeability coefficient
- PBS:
-
phosphate buffered saline
- PKC:
-
protein kinase C
- SEM:
-
scanning electron microscopy
- S.E.M.:
-
standard error of the mean
- TEER:
-
trans-epithelial electrical resistance
- TEM:
-
transmission electron microscopy
- ZO-1:
-
zonula occludens-1
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Acknowledgments
Thanks to the BBSRC and Micap plc for funding this project and to Adrian Hick for assisting with preparation of samples for electron microscopy.
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Fuller, E., Duckham, C. & Wood, E. Disruption of Epithelial Tight Junctions by Yeast Enhances the Paracellular Delivery of a Model Protein. Pharm Res 24, 37–47 (2007). https://doi.org/10.1007/s11095-006-9124-0
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DOI: https://doi.org/10.1007/s11095-006-9124-0