Tight junctions: is there a role in dermatology?

Area of Science:

• Dermatology
• Cell Biology
• Molecular Biology

Background:

• Mammalian epidermis contains diverse tight junction (TJ) proteins, including claudins, occludin, tricellulin, zonula occludens-proteins, and junctional adhesion molecules.
• These TJ proteins exhibit complex localization patterns within the epidermis.
• Expression and localization of TJ proteins are often altered in skin diseases, such as skin tumors.

Purpose of the Study:

• To review the current understanding of tight junction (TJ) protein involvement in mammalian skin.
• To explore the functions of TJs and TJ proteins in the skin, drawing parallels with their roles in simple epithelia.

Main Methods:

• Literature review of existing research on tight junctions and their proteins in mammalian skin.
• Synthesis of information regarding TJ protein localization, expression changes in disease, and functional roles.

Main Results:

• TJ proteins play roles in skin barrier function, cell polarity, gene expression, proliferation, differentiation, and vesicle transport.
• Dysregulation of TJ protein expression or localization is associated with various skin pathologies.

Conclusions:

• Tight junctions and their associated proteins are integral to multiple physiological processes in the mammalian epidermis.
• Further research into TJ protein function is essential for understanding and potentially treating skin diseases.