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Updated: Jul 29, 2025
Ameliorating Osteoarthritis in Mice Using Silver Nanoparticles
Published on: June 2, 2023
Preparation of Melatonin-Loaded Nanoparticles with Targeting and Sustained Release Function and Their Application in
Haifeng Liang1, Yiran Yan1, Wei Sun1
1Orthopedic and Traumatology Department, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China.
Abstract:
(1) The vicious cycle of innate immune response and reactive oxygen species (ROS) generation is an important pathological process of osteoarthritis (OA). Melatonin may be a new hope for the treatment of OA because of its antioxidant capacity. However, the mechanism of melatonin in the treatment of OA is still not completely clear, and the physiological characteristics of articular cartilage make melatonin unable to play a long-term role in OA. (2) The effects of melatonin on ROS and the innate immune response system in OA chondrocytes and the therapeutic effect in vivo were evaluated. Then, a melatonin-loaded nano-delivery system (MT@PLGA-COLBP) was prepared and characterized. Finally, the behavior of MT@PLGA-COLPB in cartilage and the therapeutic effect in OA mice were evaluated. (3) Melatonin can inhibit the activation of the innate immune system by inhibiting the TLR2/4-MyD88-NFκB signal pathway and scavenging ROS, thus improving cartilage matrix metabolism and delaying the progression of OA in vivo. MT@PLGA-COLBP can reach the interior of cartilage and complete the accumulation in OA knee joints. At the same time, it can reduce the number of intra-articular injections and improve the utilization rate of melatonin in vivo. (4) This work provides a new idea for the treatment of osteoarthritis, updates the mechanism of melatonin in the treatment of osteoarthritis, and highlights the application prospect of PLGA@MT-COLBP nanoparticles in preventing OA.
Insights
Melatonin can treat osteoarthritis by reducing inflammation and oxidative stress. A novel nanoparticle delivery system improves its effectiveness and longevity within cartilage, offering a promising new therapy for osteoarthritis.
Area of Science:
- Biomedical Engineering
- Immunology
- Pharmacology
Background:
- Osteoarthritis (OA) involves a detrimental cycle of innate immune response and reactive oxygen species (ROS) generation.
- Melatonin, an antioxidant, shows potential for OA treatment, but its mechanism and cartilage-specific delivery remain unclear.
- Articular cartilage's unique physiology limits melatonin's sustained therapeutic effect in OA.
Purpose of the Study:
- To investigate melatonin's effects on ROS and innate immunity in OA chondrocytes and its in vivo therapeutic efficacy.
- To develop and characterize a melatonin-loaded nano-delivery system (MT@PLGA-COLBP) for enhanced cartilage targeting.
- To evaluate the in vivo behavior and therapeutic outcomes of MT@PLGA-COLBP in an OA mouse model.
Main Methods:
- Assessed melatonin's impact on ROS and innate immune pathways (TLR2/4-MyD88-NFκB) in OA chondrocytes.
- Formulated and characterized melatonin-loaded PLGA-chitosan nanoparticles (MT@PLGA-COLBP).
- Evaluated nanoparticle biodistribution in cartilage and therapeutic effects in a mouse model of OA.
Main Results:
- Melatonin suppressed innate immune activation and ROS, improving cartilage matrix metabolism and delaying OA progression in vivo.
- MT@PLGA-COLBP nanoparticles effectively penetrated cartilage and accumulated in OA knee joints.
- The nano-delivery system reduced the need for frequent injections and enhanced melatonin's in vivo utilization.
Conclusions:
- Melatonin ameliorates osteoarthritis by inhibiting the TLR2/4-MyD88-NFκB pathway and scavenging ROS.
- MT@PLGA-COLBP nanoparticles offer a promising strategy for sustained melatonin delivery to cartilage, improving OA treatment.
- This study provides novel insights into melatonin's OA therapeutic mechanisms and highlights the potential of targeted nanoparticle systems.
