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Published on: July 14, 2023
Metal-Organic Framework-Integrated Nanoplatform Orchestrates Osteochondral-Synovial Homeostasis for Osteoarthritis
Hongwei Shao1,2, Shunxiang Xu1,2, Fanchu Zeng1,2
1Musculoskeletal Research Laboratory, Department of Orthopaedics & Traumatology, Faculty of Medicine, The Chinese University of Hong Kong, Hong Kong SAR 999077, P. R. China.
Abstract:
Osteoarthritis (OA) remains a formidable clinical challenge due to the intricate interplay of cartilage degradation, synovitis, and subchondral bone remodeling. Clinical intra-articular therapies are hindered by rapid drug clearance, inadequate cartilage penetration, and a lack of strategies targeting multifactorial pathogenesis. Herein, we engineered a hybrid nanoplatform for multiaction therapeutics by integrating boundary lubrication and "osteochondral-synovial synergistic effect." The kartogenin (KGN)-loaded Mg/Zn-based metal-organic framework (Mg-ZIF) core, encapsulated within a cartilage affinity peptide-conjugated lubricant liposome (CAP-Lipo) shell, resulted in the CAP-Lipo@KGN@Mg-ZIF (CLKM) nanoplatform. This design synergistically achieved enhanced chondrocyte uptake, deep cartilage penetration, and prolonged joint retention. CLKM suppressed chondrocyte apoptosis and catabolic metabolism via diverse signaling pathways. Mg2+/Zn2+ released from CLKM reprogrammed synovial macrophages toward a reparative phenotype, mitigating inflammation-driven cartilage matrix degradation and inhibiting osteoclastogenesis. Furthermore, KGN cooperated with the ionic microenvironment to enhance stem cell recruitment and chondrogenesis, driving structural cartilage repair. In surgery-induced OA mice, CLKM effectively preserved cartilage integrity, reduced synovitis, normalized subchondral bone remodeling, and restored gait symmetry. In loading-induced post-traumatic OA (PTOA) mice, a single intra-articular injection of CLKM counteracted PTOA progression. This study establishes CLKM as a versatile nanoplatform that orchestrates chondroprotection, immunomodulation, and tissue remodeling, disrupting the vicious cycle and offering a promising strategy for OA management.
Insights
A novel nanoplatform, CLKM, effectively treats osteoarthritis (OA) by protecting cartilage, modulating inflammation, and promoting tissue repair. This breakthrough offers a promising therapeutic strategy for managing OA progression.
Area of Science:
- Biomaterials Science
- Nanotechnology
- Orthopedics
Background:
- Osteoarthritis (OA) presents a significant clinical challenge due to complex cartilage degradation, synovitis, and subchondral bone changes.
- Current intra-articular therapies for OA face limitations including rapid clearance, poor cartilage penetration, and lack of multifactorial targeting.
Purpose of the Study:
- To engineer a hybrid nanoplatform (CLKM) for synergistic, multi-action OA therapeutics.
- To integrate boundary lubrication and an osteochondral-synovial synergistic effect for enhanced OA treatment.
Main Methods:
- Development of a CLKM nanoplatform: kartogenin (KGN)-loaded Mg/Zn-based metal-organic framework (Mg-ZIF) core within a cartilage affinity peptide-conjugated lubricant liposome (CAP-Lipo) shell.
- Evaluation of CLKM's chondrocyte uptake, cartilage penetration, joint retention, and therapeutic effects in OA mouse models (surgery-induced and post-traumatic OA).
- Assessment of CLKM's impact on chondrocyte apoptosis, catabolic metabolism, synovial macrophage phenotype, osteoclastogenesis, stem cell recruitment, and chondrogenesis.
Main Results:
- CLKM demonstrated enhanced chondrocyte uptake, deep cartilage penetration, and prolonged joint retention.
- CLKM suppressed chondrocyte apoptosis and catabolic activity, reprogrammed synovial macrophages to a reparative phenotype, and inhibited osteoclastogenesis.
- CLKM promoted stem cell recruitment and chondrogenesis, leading to cartilage structural repair, preservation of cartilage integrity, reduced synovitis, normalized subchondral bone remodeling, and restored gait symmetry in OA mice.
Conclusions:
- The CLKM nanoplatform effectively orchestrates chondroprotection, immunomodulation, and tissue remodeling to disrupt the OA vicious cycle.
- CLKM offers a promising and versatile therapeutic strategy for managing osteoarthritis progression and improving joint function.
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