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Updated: Jan 16, 2026
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Simple Polyacrylamide-based Multiwell Stiffness Assay for the Study of Stiffness-dependent Cell Responses
Published on: March 25, 2015
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Substrate Stiffness Modulates Fibroblast Extracellular Vesicle Secretion Via Mechanotransduction Pathways
Jun Yang1, Lara Ece Celebi2,3, Lauren Hawthorne2,3
1Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, IN, 46556, USA.
Small (Weinheim an Der Bergstrasse, Germany)
|September 27, 2025
Summary
Extracellular matrix stiffness influences extracellular vesicle (EV) secretion and cargo in fibroblasts. This mechanical cue impacts EV size and protein composition, revealing new pathways for therapeutic targeting in diseases like cancer.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Mechanobiology
Background:
- The extracellular matrix (ECM) is a critical regulator of cell behavior, with stiffness implicated in diseases like cancer and cardiovascular conditions.
- Extracellular vesicles (EVs) mediate intercellular communication, but the impact of ECM stiffness on their secretion is not well understood.
Purpose of the Study:
- To investigate how substrate stiffness affects the size and proteomic composition of EVs secreted by mammary and cardiac fibroblasts.
- To identify mechanotransduction pathways regulating stiffness-induced changes in EV characteristics.
Main Methods:
- Culturing mouse mammary and cardiac fibroblasts on substrates with varying stiffness.
- Analyzing EV size and proteomic cargo using advanced techniques.
- Investigating the roles of p53 and thioredoxin in mechanotransduction pathways.
Main Results:
- Substrate stiffness significantly alters EV size, with larger EVs produced below 20 kPa and smaller EVs on stiffer substrates.
- Stiffness-dependent changes in EV proteomic cargo were identified, suggesting reprogramming of signaling functions.
- Mechanotransduction pathways involving p53 and thioredoxin were found to regulate these stiffness-induced alterations.
Conclusions:
- ECM stiffness is a key modulator of EV secretion and composition.
- Thioredoxin and p53 pathways differentially regulate EV changes in mammary and cardiac fibroblasts, respectively.
- These findings offer insights into ECM remodeling's influence on fibroblast-derived EVs and potential therapeutic targets.
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