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Related Experiment Video

Updated: Jun 25, 2026

Simple Polyacrylamide-based Multiwell Stiffness Assay for the Study of Stiffness-dependent Cell Responses
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Published on: March 25, 2015

Substrate Stiffness and Viscoelasticity Influence Fibroblast Senescence.

Mackenzie L Skelton1, Tanvi Bhat2, Ethan Yu1

  • 1Department of Biomedical Engineering, University of Virginia, Charlottesville, Virginia, USA.

Journal of Biomedical Materials Research. Part A
|June 24, 2026
PubMed
Summary

Tissue mechanics influence fibroblast senescence. Soft, viscoelastic hydrogels promote senescence onset and amplification, independent of genotoxic stress, highlighting mechanics

Keywords:
hydrogelsmechanobiologysenescenceviscoelasticity

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Published on: February 3, 2018

Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Mechanobiology

Background:

  • Senescent cell accumulation is linked to aging and fibrosis, conditions with increased tissue stiffness.
  • The direct relationship between tissue mechanics and senescence induction is not fully understood.
  • Fibroblasts play a key role in tissue structure and are susceptible to senescence.

Purpose of the Study:

  • To investigate how hydrogel stiffness and viscoelasticity influence fibroblast senescence.
  • To determine the combined effects of mechanical properties and genotoxic stress on senescence.
  • To elucidate the role of YAP/TAZ signaling and nuclear organization in mechanically induced senescence.

Main Methods:

  • Culturing human lung fibroblasts on hydrogels with varying stiffness (kPa) and viscoelastic properties.
  • Inducing senescence using mechanical stimuli and/or genotoxic stress.
  • Assessing senescence markers, YAP/TAZ localization, and nuclear morphology (DAPI intensity).

Main Results:

  • Senescent fibroblasts retain mechanosensing capabilities, showing increased YAP/TAZ nuclear localization on stiffer hydrogels.
  • Soft (2 kPa) viscoelastic substrates uniquely promote senescence onset and amplification, even without genotoxic stress.
  • Mechanically induced senescence is linked to decreased nuclear DAPI intensity, not necessarily YAP/TAZ activity decline.

Conclusions:

  • Hydrogel viscoelasticity, particularly softness, is a significant factor in inducing fibroblast senescence.
  • Nuclear organization, indicated by DAPI intensity, may play a crucial role in mechanically driven senescence.
  • This study underscores the importance of mechanical cues in cellular aging and fibrotic disease processes.