Abstract
Background
IL-1β is a cytokine involved in mediating epithelial barrier dysfunction in the gut. It is known that IL-1β mediates activation of non-muscle myosin light chain kinase in epithelial cells, but the precise mechanism by which epithelial barrier dysfunction is induced by IL-1β is not understood.
Methods and Results
Using a Caco2 cell model, we show that the expression of the tight junction protein, claudin-3, is transcriptionally downregulated by IL-1β treatment. In addition, after assessing protein and mRNA expression, and protein localization, we show that inhibition of nmMLCK rescues IL-1β-mediated decrease in claudin-3 expression as well as junction protein redistribution. Using chromatin immunoprecipitation assays, we also show that β-catenin targeting of the claudin-3 promoter occurs as a consequence of IL-1β-mediated epithelial barrier dysfunction, and inhibition of nmMLCK interferes with this interaction.
Conclusions
Taken together, these data represent the first line of evidence demonstrating nmMLCK regulation of claudin-3 expression in response to IL-1β-treated epithelial cells.
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Funding was provided by US Department of Veterans’ Affairs (Merit Review BX000799) and National Institutes of Health (R01 HL096640 & HL120954).
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The authors have no conflict of interest to declare. The contents of this publication do not represent the views of the Department of Veterans Affairs or the US Government.
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Haines, R.J., Beard, R.S., Chen, L. et al. Interleukin-1β Mediates β-Catenin-Driven Downregulation of Claudin-3 and Barrier Dysfunction in Caco2 Cells. Dig Dis Sci 61, 2252–2261 (2016). https://doi.org/10.1007/s10620-016-4145-y
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DOI: https://doi.org/10.1007/s10620-016-4145-y