Focal adhesion: Physics of a Biological Mechano-Sensor

TL;DR

This paper presents a quantitative model explaining how focal adhesions function as biological mechano-sensors, regulating stress through a phase transition mechanism, advancing understanding of cell-substrate mechanical interactions.

Contribution

It introduces a novel model based on stress amplification at a condensation transition to explain focal adhesion mechano-sensing and stress regulation.

Findings

Focal adhesions can be modeled as phase transitions in adhesion proteins.

Stress amplification occurs at a critical point, regulating cellular traction.

The model links mechanical sensing to a condensation transition in proteins.

Abstract

Mechanical coupling between a cell and substrate relies on focal adhesions, clusters of adhesion proteins linking stress fibers (bundles of actin proteins) inside the cell with surrounding tissue. Focal adhesions have been demonstrated to both measure and regulate the mechanical traction along the stress fibers. We present a quantitative model for focal adhesion mechano-sensing and stress regulation based on stress amplification at the critical point of a condensation transition of the adhesion proteins.