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        Claudin-4: Functional Studies Beyond the Tight Junction

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        Claudin-4 is an unusual member of the claudin family; in addition to its role in epithelial tight junction barrier function, it is a receptor for the Clostridium perfringens enterotoxin. We have also found that claudin-4 is regulated in mucosal epithelium M cells, both in increased expression of the protein and in redistribution into endocytosis vesicles. Our ongoing studies are studying the potential for developing ligands specific to claudin-4 for targeted delivery of cargo such as proteins and poly(dl -lactide-co-glycolide) nanoparticles to mucosal M cells. Methods for the study of claudin-4 movement within epithelial cells, and delivery of nanoparticles through targeted binding of claudin-4 are described.
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