Tuning collagen nonlinear mechanics with interpenetrating networks drives adaptive cellular phenotypes in three dimensions

Sci Adv. 2025 Jun 20;11(25):eadt3352. doi: 10.1126/sciadv.adt3352. Epub 2025 Jun 20.

Abstract

In living tissues, collagen networks rarely exist alone because they are embedded within other biological matrices. When combined, collagen networks rigidify via synergistic mechanical interactions and stiffen only with higher mechanical loads. However, how cells respond to the nonlinear elasticity of collagen in hybrid networks remains largely unknown. Here, we demonstrate that when collagen rigidifies by the interpenetration of a second polymer, the amount of force that initially stiffens the network (onset of stiffening, σc) increases and is sufficient to stimulate an increase in intracellular tension. We investigated this effect by precisely controlling the nonlinear elasticity of collagen with the synthetic semiflexible polymer, polyisocyanopeptides. We find that small increases in σc induce a biphasic response in cell-matrix interactions, influencing how cells migrate, proliferate, and generate contractile force. Our results suggest that cells adaptively respond to changes in the nonlinear mechanics of collagen, which may be a mechanistic behavior used during tissue homeostasis or when collagen rigidifies during pathological conditions.

MeSH terms

  • Animals
  • Biomechanical Phenomena
  • Cell Movement
  • Cell Proliferation
  • Collagen* / chemistry
  • Collagen* / metabolism
  • Elasticity
  • Extracellular Matrix / metabolism
  • Humans
  • Phenotype

Substances

  • Collagen