Mechanically induced formation and maturation of 3D-matrix adhesions (3DMAs) in human mesenchymal stem cells.

Mechanically induced formation and maturation of 3D-matrix adhesions (3DMAs) in human mesenchymal stem cells. Biomaterials. 2020 Aug 12;258:120292 Authors: Li CW, Lau YT, Lam KL, Chan BP Abstract Mechanical signal is important for regulating stem cell fate, but the molecular mechanisms involved are unclear. Cell-matrix adhesions are important molecular mechanosensors that their formation and maturation are force-dependent processes. However, most studies focused on the role of cell contractility or substrate stiffness in these processes. How external mechanical force stimulates the formation and maturation of cell-matrix adhesions is largely unknown. Here, by using human mesenchymal stem cells (hMSCs)-collagen microtissues as a 3D model, we found that upon short-term dynamic compression, integrin αV binding, focal adhesion formation, and subsequent FAK activation, are stimulated. This compression-stimulated FAK signaling also leads to YAP activation, suggesting crosstalk between integrin-based signaling and mechanosensing. More importantly, long-term compression induces maturation of α5-integrin based adhesions to form long, slender 3D-matrix adhesions (3DMAs), which are distinct from 2D focal adhesions in composition and morphology and previously found only in cell-derived matrices and native tissues. Mechanical preconditioning hMSCs with long-term compression loading induces the formation of mature integrin α5-dependent 3DMAs an...
Source: Biomaterials - Category: Materials Science Authors: Tags: Biomaterials Source Type: research