Substrate adhesion determines migration during mesenchymal cell condensation in chondrogenesis

Area of Science:

• Biomaterials Science
• Developmental Biology
• Regenerative Medicine

Background:

• Mesenchymal condensation is crucial for chondrogenesis, but its mechanisms are not fully understood.
• In vivo, cells migrate towards fibronectin-rich areas, forming condensations.

Purpose of the Study:

• To investigate the role of matrix adherence and cell-cell interactions in mesenchymal cell migration during condensation.
• To explore the impact of substrate adhesiveness on cell migration modes and condensate formation.

Main Methods:

• Utilized dendrimer-based nanopatterns with arginine-glycine-aspartic acid (RGD) peptides to control substrate adhesion.
• Employed live-cell imaging to record collective and single-cell migration of mesenchymal stem cells under chondrogenic induction.
• Conducted inhibition experiments to assess the role of N-cadherin in cell-cell interactions and migration.

Main Results:

• Single-cell migration mode is dependent on substrate adhesiveness.
• Cell directionality influences condensate formation and fusion.
• N-cadherin mediated cell-cell interactions are essential for maintaining condensate cohesion and directional migration.

Conclusions:

• Cell migration during mesenchymal condensation is regulated by a balance between cell-matrix and cell-cell adhesions.
• Findings provide insights into fibronectin-matrix interactions during chondrogenesis.
• Potential applications in regenerative medicine for cartilage repair.