Fiber recruitment drives a phase transition of cell polarization at a critical cell spacing in matrix-mediated tissue remodeling

• 成果类型: Article
• 署名作者: Peng, Xiangjun; Huang, Yuxuan; Kong, Wenyu; Du, Yanan; Elson, Elliot L.; Feng, Xi-Qiao; Genin, Guy M.
• 署名单位: Tsinghua University; National Science Foundation (NSF); Washington University (WUSTL); Tsinghua University
• 刊物名称: PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
• ISSN/ISSBN: 0027-8424; 1091-6490
• DOI: 10.1073/pnas.2514995122
• 发表日期: 2025-10-07
• 页码: e2514995122
• 关键词: mechanobiology; cell-cell communication through fibrous ECM; tissue remodeling; phase transitions; phenotypic transformation; force transmission; mechanics; alignment; range; protrusions; DYNAMICS; RIGIDITY; fibrosis; gels

摘要

Biological tissues exhibit sharp phase transitions where cells collectively transition from disordered to ordered states at critical densities. We demonstrate through bio-chemomechanical modeling that this emergent behavior arises from a nonmonotonic depenbetween cells is optimized at intermediate stiffness values where cells can both generate sufficient forces and create strain-stiffened tension bands in the ECM. This balance establishes a critical cell spacing threshold for cell-cell communication (similar to 100 to 200 mu m) that is conserved across experimental observations for a broad range of cell types and collagen densities. Our model reveals that the critical stretch ratio at which fibrous networks transition from compliant to strain-stiffening governs this threshold through the formation of tension bands between neighboring cells. These mechanical commudensity exceeds an effective percolation threshold. Our model explains how microscale cell-ECM interactions control emergent mechanical properties in biological systems and offers insight both into the physics of inhomogeneous materials under active stress, and into potential mechanical interventions for wound healing and fibrotic disorders.