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First published online March 2, 2004
doi: 10.1242/10.1242/jcs.00972
Research Article |
Department of Cell Biology, Faculty of Medicine, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
* Author for correspondence (e-mail: htsukita{at}mfour.med.kyoto-u.ac.jp)
Accepted 5 November 2003
Tight junctions (TJs) seal the intercellular space of epithelial cells, while individual epithelial cells move against adjacent cells in cellular sheets. To observe TJs in live epithelial cellular sheets, green fluorescent protein (GFP) was fused to the N-terminus of claudin-3 (a major cell adhesion molecule of TJs), which was stably expressed at a level that was approximately 50% of that of endogenous claudin-3 in mouse Eph4 epithelial cells. Under confluent culture conditions, individual cells moved within cellular sheets, which was associated with the remodeling of TJs. However, during this remodeling, GFP-positive TJs did not lose their structural continuity. When TJs between two adjacent cells decreased in length during this remodeling, GFP-claudin-3 was frequently pinched off as a granular structure from GFP-positive TJs together with endogenous claudins. Co-culture experiments, as well as electron microscopy, revealed that the two apposed membranes of TJs were not detached, but co-endocytosed into one of the adjacent cells. Interestingly, other TJ components such as occludin, JAM and ZO-1 appeared to be dissociated from claudins before this endocytosis. The endocytosis of claudins was facilitated when the intercellular motility was upregulated by wounding the cellular sheets. These findings suggest that this peculiar internalization of claudins plays a crucial role in the remodeling of TJs, and that the fine regulation of this endocytosis is important for TJs to seal the intercellular space of epithelial cells that are moving against adjacent cells within cellular sheets.
Key words: Claudin, ZO-1, Tight junction, Intercellular motility, Internalization
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