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Updated: Feb 4, 2026
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Development of a Rabbit Chronic-Like Rotator Cuff Injury Model for Study of Fibrosis and Muscular Fatty Degeneration
Published on: March 31, 2023
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Localized SDF-1α Delivery Increases Pro-Healing Bone Marrow-Derived Cells in the Supraspinatus Muscle Following
L E Tellier1, J R Krieger1, A L Brimeyer1
1Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA.
Regenerative Engineering and Translational Medicine
|October 6, 2018
Summary
Injectable microparticles delivering stromal cell-derived factor-1alpha (SDF-1α) promote muscle healing after rotator cuff injury. This approach significantly increased beneficial M2-like macrophages and mesenchymal stem cells, creating a pro-regenerative environment for improved tissue repair.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Musculoskeletal Research
Background:
- Rotator cuff injuries disrupt the muscle's cellular environment, hindering natural healing.
- The chemotactic agent stromal cell-derived factor-1alpha (SDF-1α) plays a role in cellular recruitment and tissue repair.
- Modulating the cellular milieu is crucial for enhancing muscle regeneration after injury.
Purpose of the Study:
- To investigate how SDF-1α influences the cellular composition of supraspinatus muscle post-rotator cuff injury.
- To develop and evaluate an injectable, heparin-based microparticle system for localized SDF-1α delivery.
Main Methods:
- Fabrication of degradable, N-desulfated heparin-based microparticles loaded with SDF-1α.
- Injection of microparticles into a rat model of severe rotator cuff injury.
- Analysis of inflammatory cell and mesenchymal stem cell populations using flow cytometry.
Main Results:
- SDF-1α loaded microparticles were retained at the injury site for up to 7 days.
- A significant increase in anti-inflammatory M2-like macrophages (4.3-fold) and mesenchymal stem cells (3.0-fold) was observed in SDF-1α treated muscles.
- Treated muscles showed a shift towards a more pro-regenerative cellular composition compared to controls.
Conclusions:
- Injectable SDF-1α loaded microparticles represent a novel strategy to modulate the cellular environment in rotator cuff injuries.
- This approach holds potential for creating a pro-regenerative milieu to improve muscle healing and repair.
- Further development could lead to improved therapeutic outcomes for rotator cuff injuries.
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