E-cadherin mediated lateral interactions between neighbor cells necessary for collective migration

Collective cell migration is a key process in both physiological and pathological contexts, including wound healing and tumor metastasis. Existing research has primarily focused on migration patterns and force dynamics using flat, patterned substrates. However, the role of lateral cell-cell adhesion in maintaining group cohesion during migration remains unclear. While the extracellular matrix is known to influence cell movement, the specific contribution of junctional proteins like E-cadherin is less understood. Prior studies have not fully explored how lateral adhesions affect migration velocity and force distribution. This gap motivated the development of new tools to study lateral interactions in controlled environments. The need to understand how cells coordinate movement within a group is evident in cancer progression and tissue regeneration. Current limitations include a lack of methods to directly measure forces in cell-cell junctions during migration. This study addresses these limitations by introducing a novel microfluidic platform.

The aim of this study was to investigate the role of lateral E-cadherin-based adhesions in collective cell migration. Specifically, the researchers sought to determine whether these adhesions contribute to group cohesion and influence migration speed. They designed a microfluidic system with E-cadherin-coated sidewalls to enable controlled lateral interactions between cells. The study aimed to measure how cell-cell adhesion affects movement dynamics in confined geometries. Researchers also wanted to assess how E-cadherin influences force transmission during migration. The goal was to distinguish between adhesion's role in cohesion versus propulsion. The study focused on epithelial cells, which are known for their strong cell-cell adhesion. The findings could help clarify how adhesion proteins contribute to coordinated cell movement in disease contexts.

The researchers used a multi-channel microfluidic device to study lateral cell interactions. The device's sidewalls were coated with E-cadherin to promote cell-cell adhesion. Epithelial cells were introduced into the channels, allowing lateral interactions to occur. The device enabled control over channel width and surface adhesiveness. Cell migration was tracked using time-lapse imaging to measure velocity and direction. FRET sensors were used to monitor alpha-actinin tension during migration. The study compared migration in E-cadherin-coated channels to non-adhesive channels. Data on cell speed, group cohesion, and force distribution were collected and analyzed.

Cells migrated faster in narrower channels compared to wider ones, indicating geometric constraints influence speed. However, migration velocity was lower in E-cadherin-coated channels than in non-adhesive channels. The study found that epithelial cells depend on lateral E-cadherin adhesions to maintain group cohesion during migration. FRET measurements revealed higher tension in alpha-actinin at cell edges adjacent to E-cadherin-coated walls. This suggests that E-cadherin transmits shear forces but does not generate propulsion. The data indicate that lateral adhesions play a structural role in maintaining group integrity. No evidence was found that E-cadherin provides a driving force for migration. These findings clarify the functional role of E-cadherin in collective cell movement.

The study clarifies that lateral E-cadherin-based adhesions are essential for maintaining group cohesion during collective migration. The findings suggest that these adhesions transmit forces but do not drive movement forward. The researchers observed that migration velocity is reduced in E-cadherin-coated channels compared to non-adhesive ones. This implies that adhesion may limit speed rather than promote it. The data support the idea that E-cadherin contributes to structural stability rather than propulsion. The study confirms that epithelial cells rely on lateral adhesions for coordinated movement. No evidence was found that E-cadherin generates forward force during migration. The results highlight the importance of controlled environments in studying cell-cell interactions.