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Updated: Jul 4, 2025
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Measuring Global Cellular Matrix Metalloproteinase and Metabolic Activity in 3D Hydrogels
Published on: January 22, 2019
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Quantification of local matrix deposition during muscle stem cell activation using engineered hydrogels
Pamela Duran1,2, Benjamin A Yang1,2, Eleanor Plaster1
1Dept. of Biomedical Engineering, University of Michigan, Ann Arbor, MI 48109, USA.
Biorxiv : the Preprint Server for Biology
|February 8, 2024
Summary
Skeletal muscle stem cells deposit extracellular matrix, crucial for their function. Impaired matrix deposition in aged muscles can be reversed with growth factors, highlighting its importance for stem cell health.
Area of Science:
- Biomedical Engineering
- Cell Biology
- Regenerative Medicine
Background:
- Adult stem cells reside in specialized niches influencing their function.
- The mechanisms by which stem cells remodel their microenvironment, particularly extracellular matrix (ECM) deposition, are not fully understood.
- Skeletal muscle stem cells (MuSCs) play a vital role in muscle repair and regeneration.
Approach:
- Utilized biomaterials-based systems and metabolic labeling to investigate nascent ECM deposition by MuSCs.
- Compared matrix production between MuSCs, committed myoblasts, and fibro-adipogenic progenitors (FAPs).
- Assessed the impact of substrate stiffness mimicking physiological conditions (uninjured and injured muscle) on matrix deposition.
- Investigated the functional consequences of impaired nascent matrix production in MuSCs.
- Examined the potential for therapeutic rescue using insulin-like growth factors (IGFs).
Key Points:
- MuSCs and myoblasts deposited less nascent matrix compared to resident FAPs.
- Increased nascent matrix deposition by MuSCs correlated with stem cell activation on substrates matching physiological stiffness.
- Reduced matrix deposition capacity in MuSCs attenuated their function, mirroring age-related impairments.
- Therapeutic supplementation with IGFs rescued the functional deficits caused by impaired matrix deposition.
- Nascent matrix production is critical for maintaining healthy skeletal muscle stem cell function.
Conclusions:
- Skeletal muscle stem cells actively remodel their niche through extracellular matrix deposition.
- The stiffness of the muscle microenvironment influences stem cell activation and matrix production.
- Impaired extracellular matrix deposition is a key factor in age-related stem cell dysfunction.
- Targeting nascent matrix production or utilizing growth factors like IGFs holds therapeutic potential for enhancing stem cell function and muscle regeneration.
