Decoupling of Density-Dependent Migration/Proliferation Dichotomy on Surface Potential Gradient

Area of Science:

• Biomaterials Science
• Cell Biology
• Tissue Engineering

Background:

• Cell migration and proliferation are crucial for tissue development and repair.
• These processes are influenced by both external cues from the microenvironment and cell-cell interactions.
• Understanding how cells integrate these signals to switch phenotypes is essential but not fully elucidated.

Purpose of the Study:

• To investigate the role of electric surface potential gradients in decoupling cell migration and proliferation.
• To explore the underlying signaling mechanisms involved in cell density-dependent responses to piezoelectric biomaterials.
• To establish a new framework for understanding cell-material and cell-cell interactions in materiobiology.

Main Methods:

• Fabrication of piezoelectric biomaterials with a heterogeneous electric surface potential gradient.
• Utilizing these materials to culture cells at varying densities.
• Analyzing cell migration, proliferation, and key signaling pathways (integrin/cytoskeleton, E-cadherin/β-catenin).

Main Results:

• The electric surface potential gradient significantly enhanced both individual and collective cell migration.
• At low cell density, proliferation was reduced via G0/G1 cell cycle arrest mediated by the integrin/cytoskeleton axis.
• At high cell density, proliferation was inhibited primarily through the E-cadherin/β-catenin signaling pathway.

Conclusions:

• Cellular response to electric surface potential gradients is density-dependent, affecting migration and proliferation through distinct signaling mechanisms.
• Initial cell density is a key factor in determining proliferative potential, irrespective of substrate properties.
• This work provides novel insights into materiobiology, highlighting the interplay between material properties and cellular communication.