MRI-visible mesoporous polydopamine nanoparticles with enhanced antioxidant capacity for osteoarthritis therapy.

Abstract

Since the progression of osteoarthritis (OA) is closely associated with synovitis and cartilage destruction, the inhibition of inflammatory responses in synovial macrophages and reactive oxygen species (ROS) induced apoptosis in chondrocytes is crucial for OA amelioration. However, most of the current anti-inflammatory and antioxidant drugs are small molecules apt to be eliminated in vivo. Herein, mesoporous polydopamine nanoparticles (DAMM NPs) doped with arginine and manganese (Mn) ions were prepared to load dexamethasone (DEX) for OA intervention. A series of in vitro studies showed that the sustained release of DEX from DAMM NPs suppressed synovial inflammation and simultaneously inhibited toll-like receptor 3 (TLR-3) production in chondrocytes, contributing to prevention of chondrocyte apoptosis through the inflammatory factor-dependent TLR-3/NF-κB signaling pathway via modulation of macrophage-chondrocyte crosstalk. In addition, DAMM NPs exerted a predominant role in removal of ROS generated in chondrocytes. Therefore, the DEX-loaded DAMM NPs significantly attenuated OA development in mice model. Importantly, the T1-T2 magnetic contrast capabilities of DAMM NPs allowed an MRI-trackable delivery, manifesting a distinct feature widely regarded to boost the potential of nanomedicines for clinical applications. Together, our developed antioxidant-enhanced DAMM NPs with MRI-visible signals may serve as a novel multifunctional nanocarriers for prevention of OA progression.

• Authors: Sitong Liu, Chen Zhang, Yuanyuan Zhou, Fang Zhang, Xiaohui Duan, Yang Liu, Xibang Zhao, Jie Liu, Xintao Shuai, Jiali Wang, Zhong Cao
• Journal: Biomaterials (Biomaterials) Vol. 295 Pg. 122030 (04 2023) ISSN: 1878-5905 [Electronic] Netherlands
• PMID: 36758340 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2023 Elsevier Ltd. All rights reserved.

Chemical References

• Antioxidants
• polydopamine
• Toll-Like Receptor 3
• Reactive Oxygen Species
• NF-kappa B

Topics

• Mice
• Animals
• Antioxidants (therapeutic use, metabolism)
• Toll-Like Receptor 3 (metabolism, therapeutic use)
• Reactive Oxygen Species (metabolism)
• Osteoarthritis (diagnostic imaging, drug therapy, metabolism)
• NF-kappa B (metabolism)
• Nanoparticles
• Chondrocytes (metabolism)