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Programmable Macrophage Mimics for Inflammatory Meniscus Regeneration via Nanotherapy
Xujie Lu1, Zheng Ci1, Bohui Li2
1Department of Plastic and Reconstructive Surgery, Shanghai Ninth People's Hospital, Shanghai Key Laboratory of Tissue Engineering, Shanghai Jiao Tong University School of Medicine, Shanghai 200001, PR China.
Research (Washington, D.C.)
|January 14, 2026
Summary
New programmable macrophage mimics (PMMs) promote knee meniscus regeneration by reducing inflammation and guiding stem cell differentiation. This breakthrough offers a promising strategy for treating severe meniscal injuries.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Nanotechnology
Background:
- Meniscal injuries are prevalent knee joint issues, with severe cases lacking effective regeneration strategies.
- Inflammatory responses following meniscal damage impede natural tissue repair.
- Current treatments for severe meniscal injuries are limited, necessitating novel therapeutic approaches.
Purpose of the Study:
- To develop programmable macrophage mimics (PMMs) for sequential anti-inflammatory action and meniscal tissue regeneration.
- To create a composite hydrogel system integrating PMMs with meniscus-specific matrix for enhanced regeneration.
- To evaluate the efficacy of PMM-loaded hydrogels in a rabbit osteoarthritis model.
Main Methods:
- Programmable macrophage mimics (PMMs) were synthesized by encapsulating growth factors (transforming growth factor-β3, insulin-like growth factor-1) in mesoporous silica nanoparticles.
- PMMs were modified with polyethyleneimine and disulfide bonds for controlled cytokine adsorption and growth factor release.
- PMMs were incorporated into meniscus-specific acellular matrix hydrogels (mGC) and tested in rabbit osteoarthritis models.
Main Results:
- PMMs successfully transitioned from anti-inflammatory to pro-regenerative functions.
- ADSC-loaded PMMs@mGC hydrogels demonstrated significant fibrocartilage regeneration in rabbit models.
- A biofabrication approach for total meniscus replacement using PMMs was developed.
Conclusions:
- Programmable macrophage mimics (PMMs) serve as effective bifunctional nano-delivery systems.
- PMMs hold significant therapeutic potential for managing inflammatory meniscal conditions and promoting regeneration.
- This study presents a novel strategy for advancing meniscus repair and replacement therapies.
