Afadin-nectin forces its way to the front.

Area of Science:

• Cell biology
• Biophysics
• Developmental biology

Background:

• Cell-cell junctions are vital for tissue structure and function.
• Force transmission through these junctions regulates biological processes.
• The cadherin-catenin complex was historically considered the primary mediator of junctional force.

Purpose of the Study:

• To investigate the relative roles of different protein linkages in force transmission at mature cell-cell junctions.
• To challenge the established paradigm of cadherin-catenin as the sole mediator of junctional force.
• To identify the predominant linkage responsible for force transmission in the intestinal epithelium.

Main Methods:

• Utilized advanced biophysical techniques to measure force transmission.
• Investigated protein interactions within cell-cell junctions.
• Focused on the intestinal epithelium as a model system.

Main Results:

• New findings indicate the nectin-afadin linkage plays a more significant role than previously thought.
• The cadherin-catenin linkage's role in mature junctions is less dominant than the nectin-afadin linkage.
• This suggests a paradigm shift in understanding junctional force mechanics.

Conclusions:

• The nectin-afadin linkage is the primary mediator of force transmission in mature intestinal cell junctions.
• This discovery redefines the molecular mechanisms underlying cell-cell adhesion and tissue mechanics.
• Understanding these forces is crucial for studying development, homeostasis, and diseases like cancer.