Abstract
Inflammation can impair intestinal barrier, while increased epithelial permeability can lead to inflammation. In this study, we found that the expression of Tspan8, a tetraspanin expressed specifically in epithelial cells, is downregulated in mouse model of ulcerative disease (UC) but correlated with those of cell–cell junction components, such as claudins and E-cadherin, suggesting that Tspan8 supports intestinal epithelial barrier. Tspan8 removal increases intestinal epithelial permeability and upregulates IFN-γ-Stat1 signaling. We also demonstrated that Tspan8 coalesces with lipid rafts and facilitates IFNγ-R1 localization at or near lipid rafts. As IFN-γ induces its receptor undergoing clathrin- or lipid raft-dependent endocytosis and IFN-γR endocytosis plays an important role in Jak-Stat1 signaling, our analysis on IFN-γR endocytosis revealed that Tspan8 silencing impairs lipid raft-mediated but promotes clathrin-mediated endocytosis of IFN-γR1, leading to increased Stat1 signaling. These changes in IFN-γR1 endocytosis upon Tspan8 silencing correlates with fewer lipid raft component GM1 at the cell surface and more clathrin heavy chain in the cells. Our findings indicate that Tspan8 determines the IFN-γR1 endocytosis route, to restrain Stat1 signaling, stabilize intestine epithelium, and subsequently prevent intestine from inflammation. Our finding also implies that Tspan8 is needed for proper endocytosis through lipid rafts.
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Acknowledgements
We thank Dr. Claude Boucheix for special reagents and Ms. Kathy Kyler for English editing. We acknowledge the functional genomics core of Stephenson Cancer Center at the University of Oklahoma Health Sciences Center for technical support. The Nikon N-SIM-E/STORM super-resolution microscope is supported by a Large Equipment Grant from the Oklahoma Center for Adult Stem Cell Research (OCASCR) and the OUHSC Department of Cell Biology.
Funding
This work was supported by National Institutes of Health grants HL137819, GM135547, and AG068581, OCAST grant HR20-055, and research grants from OCASCR, a program of TSET, to XAZ. XAZ is an Oklahoma TSET Cancer Research Scholar.
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JM designed and performed most experiments, analyzed the data, and wrote the manuscript. SY, YC, DV, SLi, JDW. SLiu, and CJ contributed bio-informatics and statistics analyses. SY, YC SLi, JW, YD, JC, and ZW performed experiments. BL, AC, ZU and TK provided technical setup and expertise. CG made Tspan8 monoclonal antibodies. JP supervised the proteomic study. XAZ conceived the study, designed experimental approaches, supervised the study, and wrote the manuscript.
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Min, J., Yang, S., Cai, Y. et al. Tetraspanin Tspan8 restrains interferon signaling to stabilize intestinal epithelium by directing endocytosis of interferon receptor. Cell. Mol. Life Sci. 80, 154 (2023). https://doi.org/10.1007/s00018-023-04803-x
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DOI: https://doi.org/10.1007/s00018-023-04803-x