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Self-Assembled EGCG Nanoparticles Achieved Long-Term ROS Scavenging to Delay Osteoarthritis Progression
Xinyu Zhang1,2, Mingda Zhao1,2, Jiadong Li1,2
1National Engineering Research Center for Biomaterials, Sichuan University, 29#Wangjiang Road, Chengdu 610064, China.
Biomacromolecules
|February 20, 2026
Summary
New nanoparticles (PE@NPs) deliver epigallocatechin-3-gallate (EGCG) for sustained antioxidant activity, effectively protecting cartilage and bone in osteoarthritis (OA) models.
Area of Science:
- Biomaterials Science
- Orthopedics
- Pharmacology
Background:
- Osteoarthritis (OA) involves extracellular matrix degradation, particularly type II collagen (COLII), driven by oxidative stress.
- Existing antioxidants like epigallocatechin-3-gallate (EGCG) have limited stability and short-lived efficacy.
- Developing stable, long-acting antioxidant delivery systems is crucial for OA treatment.
Purpose of the Study:
- To develop self-assembled nanoparticles (PE@NPs) for enhanced delivery of EGCG.
- To evaluate the stability, antioxidant activity, and therapeutic efficacy of PE@NPs in OA models.
- To investigate the molecular mechanisms underlying PE@NPs' effects on cartilage and bone.
Main Methods:
- Fabrication of PE@NPs using hydrophobic interactions, π-π stacking, and hydrogen bonding, with an EGCG core and polyethylene glycol (PEG) shell.
- Assessment of PE@NPs' reactive oxygen species (ROS) scavenging activity and stability over 24 hours.
- In vitro studies using OA chondrocytes to evaluate COLII degradation suppression and transcriptomic analysis.
- In vivo studies in OA models to compare therapeutic effects of PE@NPs and free EGCG on cartilage, subchondral bone, and OA progression.
Main Results:
- PE@NPs demonstrated improved molecular stability and sustained ROS scavenging activity for 24 hours compared to free EGCG.
- PE@NPs significantly inhibited interleukin-1β-induced COLII degradation in OA chondrocytes.
- Transcriptomic analysis revealed PE@NPs upregulated key genes in antioxidant defense, cartilage homeostasis, and subchondral bone remodeling.
- In vivo, PE@NPs showed superior therapeutic effects, attenuating COLII degradation and enhancing subchondral bone mass, thereby delaying OA progression.
Conclusions:
- PE@NPs represent a stable and effective delivery system for EGCG, offering prolonged antioxidant protection.
- PE@NPs exhibit significant therapeutic potential for osteoarthritis by preserving cartilage integrity and improving bone health.
- These findings highlight PE@NPs as a promising therapeutic strategy for managing osteoarthritis progression.
