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The structure and function of claudins, cell adhesion molecules at tight junctions
1Department of Cell Biology, Faculty of Medicine, Kyoto University, Yoshida-Konoe, Sakyo-ku, Kyoto 606-8501, Japan. htsukita@mfour.med.kyoto-u.ac.jp
Annals of the New York Academy of Sciences
|February 24, 2001
Summary
Tight junctions (TJ) proteins, claudins, seal cell layers. Researchers found claudins are key to TJ barrier function, enabling detailed molecular studies of cell structure.
Area of Science:
- Cell Biology
- Molecular Biology
- Biochemistry
Background:
- Tight junctions (TJs) are crucial for compartmentalization in multicellular organisms.
- They seal the paracellular pathway in epithelial and endothelial cell sheets.
- Claudins, novel integral membrane proteins, are major cell adhesion molecules at TJs.
Purpose of the Study:
- To investigate the role of claudins in the formation and function of tight junctions.
- To understand the molecular basis of TJ structure and barrier function.
Main Methods:
- Transfection of claudin expression vectors into fibroblasts lacking endogenous claudins.
- Experimental validation using Clostridium perfringens enterotoxin to assess TJ barrier function.
Main Results:
- Transfected fibroblasts formed well-developed tight junctions.
- Claudins were confirmed to be directly involved in the barrier function of TJs.
- Identification of 15 members within the claudin multigene family, each approximately 23 kDa with four transmembrane domains.
Conclusions:
- Claudins are essential components of tight junctions and directly contribute to their barrier function.
- The identification of claudins provides a foundation for detailed molecular studies of TJ structure and function.