Longevity & AgingPiezo1 Ion Channel Found to Sense Tissue Viscoelasticity in Soft Matrices
Researchers discovered that the mechanosensitive ion channel Piezo1 plays a critical role in how mesenchymal stem cells detect and respond to the viscoelastic properties of soft extracellular matrices. Using engineered polyacrylamide hydrogels with independently tunable stiffness and stress-relaxation rates, combined with Piezo1 knockdown cells and computational modeling, the team showed that energy dissipation in soft matrices promotes cell spreading and focal adhesion formation in a Piezo1-dependent manner. This effect was absent on stiff matrices. RNA sequencing further identified distinct transcriptomic signatures tied to matrix viscoelasticity and Piezo1 activity, revealing downstream metabolic and gene-expression changes. The findings expand the molecular clutch model of mechanotransduction to incorporate Piezo1 as a sensor of time-dependent, not just static, matrix mechanics.
