Issue 7, 2025

MgO@SiO2 nanocapsules: a controlled magnesium ion release system for targeted inhibition of osteoarthritis progression

Abstract

Osteoarthritis (OA) is a chronic joint disease characterized by degenerative changes in articular cartilage and chronic inflammation. Recent studies suggest that intra-articular (i.a.) injection of magnesium salts holds promise as a therapeutic approach for OA. However, the rapid diffusion of magnesium ions limits their efficacy, resulting in a short duration of action. To overcome this limitation, we developed a nanoparticle delivery system using MgO@SiO2 core/shell nanoparticles, designed as a depot for the controlled release of magnesium ions. Electron microscopy confirmed the formation of the core/shell structure with silica shells of varying thickness. Release studies demonstrated that the silica coating effectively slows nanoparticle degradation, extending magnesium release to over 72 hours. In a rabbit OA model, i.a. injection of these nanocapsules significantly mitigated the pathological progression of OA within four weeks without inducing systemic toxicity. Immunohistochemical analysis further revealed that MgO@SiO2 nanocapsules alleviate the inflammatory response in OA cartilage by inhibiting the NF-κB/p65 signaling pathway. In summary, this study confirms the potential of intra-articular magnesium supplementation as a therapeutic option for OA and introduces a novel approach to enhance the delivery and efficacy of magnesium ions in OA treatment, addressing a relatively underexplored area in the field.

Graphical abstract: MgO@SiO2 nanocapsules: a controlled magnesium ion release system for targeted inhibition of osteoarthritis progression

Supplementary files

Article information

Article type
Paper
Submitted
01 Nov 2024
Accepted
17 Jan 2025
First published
21 Jan 2025
This article is Open Access
Creative Commons BY-NC license

Nanoscale Adv., 2025,7, 1814-1824

MgO@SiO2 nanocapsules: a controlled magnesium ion release system for targeted inhibition of osteoarthritis progression

N. Liu, F. Jiang, Z. Feng, S. Mei, Y. Cui, Y. Zheng, W. Yang, B. Wang, W. Zhang, J. Xie and N. Zhang, Nanoscale Adv., 2025, 7, 1814 DOI: 10.1039/D4NA00900B

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