Abstract
Background
Tight junctions play a critical role in the maintenance of intestinal barrier function. Partitioning-defective protein 3 (Par-3) can regulate intestinal barrier function through the modulation of tight junction assembly and cell polarity. However, the mechanisms are still not fully understood.
Methods
Adult C57BL/6 mice were treated with dextran sulfate sodium for 7 days, and segments of colon were harvested for immunofluorescent staining of Par-3. Caco-2 intestinal epithelial cells were treated with tumor necrosis factor α (TNF-α) for 24 h, and Par-3 expression was detected by Western blot analysis and immunofluorescence. Additionally, Caco-2 cells were treated with Par-3 small interfering RNA, and altered expression and subcellular localization of tight junction proteins were studied by Western blot analysis and immunofluorescence. Furthermore, the interaction between Par-3 and myosin light chain (MLC) was detected by immunoprecipitation.
Results
Par-3 was downregulated in murine dextran sulfate sodium induced acute inflammation and TNF-α-treated Caco-2 cells. Depletion of Par-3 expression by small interfering RNA delayed intestinal epithelial barrier development in Caco-2 cells. This regulation was due to the redistribution of the tight junction protein occludin rather than the altered total levels of tight junction proteins. Par-3 silencing blocked the trafficking of occludin from or through the Golgi complex to the cell surface, and dramatically induced occludin accumulated at the Golgi complex. Importantly, Par-3 can interact with MLC, and loss of Par-3 upregulated MLC kinase expression and MLC phosphorylation, which contributed to intestinal epithelial barrier dysfunction.
Conclusions
These results indicate that Par-3 plays an important role in the modulation of intestinal barrier function by regulating delivery of occludin as well as suppression of MLC phosphorylation.
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Acknowledgments
This research was supported by grants from the National Natural Science Foundation of China (NSFC 81330013 and NSFC 81272078 to H.Y., NSFC 81200288 to W.S.W., NSFC 81270451 to W.DX.), and the Program of Changjiang Scholars and Innovative Research (IRT 13050 to H.Y.).
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The authors declare that they have no conflict of interest.
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Yu, M., Yang, S., Qiu, Y. et al. Par-3 modulates intestinal epithelial barrier function through regulating intracellular trafficking of occludin and myosin light chain phosphorylation. J Gastroenterol 50, 1103–1113 (2015). https://doi.org/10.1007/s00535-015-1066-z
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DOI: https://doi.org/10.1007/s00535-015-1066-z