Tight junction structure, assembly and (dys)function

Area of Science:

• Cell Biology
• Biochemistry
• Physiology

Background:

• Tight junctions (TJs) are crucial for epithelial and endothelial barrier integrity.
• They control paracellular permeability, cell polarity, and tissue mechanics.
• Dysfunction of TJs is implicated in various human diseases.

Purpose of the Study:

• To review the adaptive structure and function of tight junctions across different tissues.
• To explore the role of claudin-based networks and scaffold proteins in TJ regulation.
• To discuss TJ assembly, maintenance, lumen formation, and therapeutic strategies.

Main Methods:

• Literature review focusing on recent advances in TJ research.
• Analysis of TJ assembly mechanisms, including biomolecular condensation.
• Examination of TJ regulation by scaffold proteins and actin dynamics.

Main Results:

• TJ structure and function are highly adaptable, involving claudin strands and scaffold proteins.
• Biomolecular condensation is a key mechanism for TJ assembly, integrating multiple cellular cues.
• TJ maintenance involves dynamic protein turnover and long-term developmental remodeling.
• TJ dysfunction contributes to human diseases, presenting therapeutic targets.

Conclusions:

• Tight junctions are dynamic structures essential for tissue homeostasis and barrier function.
• Understanding TJ assembly and regulation offers insights into disease pathogenesis.
• Targeting TJ proteins presents promising therapeutic avenues for various pathologies.