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Updated: Dec 11, 2025
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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
Published on: September 20, 2018
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Nuclear mechanosensing controls MSC osteogenic potential through HDAC epigenetic remodeling
Anouk R Killaars1,2, Cierra J Walker1,2, Kristi S Anseth3,4
1Materials Science and Engineering Program, University of Colorado Boulder, Boulder, CO 80303.
Summary
Cells use nuclear mechanosensing to control bone development. Manipulating this pathway, involving histone deacetylases (HDACs), can restore healthy bone cell function and may treat bone diseases.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Mechanobiology
Background:
- Cells perceive mechanical signals from their environment to maintain tissue health.
- The cell nucleus acts as a mechanosensor, influencing gene expression and epigenetics.
- Altered nuclear mechanosensing is linked to diseases like bone degeneration.
Purpose of the Study:
- To investigate how nuclear mechanosensing affects human mesenchymal stem cells (hMSCs) and their differentiation into bone cells.
- To explore the role of histone deacetylases (HDACs) in this process.
- To assess the potential for therapeutic intervention in bone diseases.
Main Methods:
- Utilized photostiffening hydrogels to control matrix stiffness and manipulate nuclear mechanosensing in hMSCs.
- Measured nuclear tension, histone acetylation, and HDAC activity.
- Investigated the effects of disrupting and restoring nuclear-cytoskeletal connections.
- Examined bone samples from osteoarthritis patients.
Main Results:
- Matrix stiffening increased nuclear tension and histone acetylation by deactivating HDACs, promoting osteogenesis in hMSCs.
- Disrupting nuclear-cytoskeletal connections led to increased HDAC activity and inhibited osteogenesis.
- Restoring HDAC activity rescued the osteogenic response in cells with impaired mechanosensing.
- Defective nuclear mechanosensing was observed in osteoarthritis patient bone samples.
Conclusions:
- Nuclear mechanosensing, mediated by HDACs and epigenetic remodeling, is crucial for hMSC osteogenic differentiation.
- Dysfunctional nuclear mechanosensing is implicated in bone diseases like osteoarthritis.
- Targeting HDACs offers a potential therapeutic strategy for bone regeneration.
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