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Published on: September 29, 2018
Evaluation of an AD-MSC Supernatant-Loaded Thermosensitive Hydrogel for Cartilage Protection in Osteoarthritis
Junpeng Zhang1, Shicheng Zhang1, Miao Cheng1
1College of Animal Science and Veterinary Medicine, Shenyang Agricultural University (SYAU), Shenyang 110866, China.
Abstract:
Knee osteoarthritis (KOA) is a degenerative joint disorder characterized by chronic inflammation and progressive cartilage degradation. Mesenchymal stem cell (MSC)-based therapies have demonstrated therapeutic potential; however, increasing evidence suggests that their efficacy primarily arises from paracrine factors, highlighting the potential of cell free approaches. In this study, we developed an injectable, thermosensitive composite hydrogel incorporating adipose-derived MSC (AD-MSC) supernatant within a Pluronic F-127 (PF-127)/sodium hyaluronate (HA) matrix. The hydrogel exhibited a solution state at a low temperature and rapidly transitioned into a stable gel at a physiological temperature without chemical crosslinkers. Microstructural analysis revealed a porous, interconnected three-dimensional network favorable for the sustained release of bioactive factors. In a rat model of KOA, intra-articular administration of the AD-MSC supernatant-loaded hydrogel significantly improved joint architecture and locomotor performance, alleviated synovial inflammation, and preserved cartilage integrity. Radiographic and histological assessments demonstrated reduced cartilage degeneration and subchondral bone alterations. Moreover, the treatment markedly decreased intra-articular levels of proinflammatory cytokines (IL-1β and TNF-α) and the cartilage degradation marker CTX-II in a time-dependent manner. These findings indicated that the sustained local delivery of AD-MSC-derived supernatant effectively modulated joint inflammation and attenuated cartilage degeneration, with the hydrogel serving primarily as a delivery vehicle for these bioactive factors. This cell-free injectable biomaterial platform could offer a promising therapeutic strategy for the treatment of knee osteoarthritis.
Insights
This study developed an injectable hydrogel delivering adipose-derived stem cell (AD-MSC) factors to treat knee osteoarthritis (KOA). The cell-free therapy reduced inflammation and preserved cartilage in a rat model, offering a promising KOA treatment.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Orthopedics
Background:
- Knee osteoarthritis (KOA) involves chronic inflammation and cartilage breakdown.
- Mesenchymal stem cell (MSC) therapies show promise, but their benefits stem mainly from paracrine factors.
- Cell-free approaches using MSC-derived factors offer a potential therapeutic strategy for KOA.
Purpose of the Study:
- To develop an injectable, thermosensitive hydrogel for sustained delivery of adipose-derived MSC (AD-MSC) supernatant.
- To evaluate the therapeutic efficacy of this cell-free hydrogel system in a rat model of KOA.
Main Methods:
- An injectable, thermosensitive hydrogel was formulated using Pluronic F-127 (PF-127) and sodium hyaluronate (HA), loaded with AD-MSC supernatant.
- The hydrogel's properties (thermosensitivity, microstructure, sustained release) were characterized.
- The efficacy of intra-articular administration of the hydrogel in a rat KOA model was assessed using joint architecture, locomotor function, synovial inflammation, cartilage integrity, and cytokine level analyses.
Main Results:
- The composite hydrogel demonstrated excellent injectability and rapid gelation at physiological temperatures, forming a porous 3D network for sustained factor release.
- Intra-articular injection of the AD-MSC supernatant-loaded hydrogel significantly improved joint architecture and locomotor function in rats with KOA.
- The treatment effectively reduced synovial inflammation, preserved cartilage integrity, decreased cartilage degeneration and subchondral bone alterations, and lowered pro-inflammatory cytokine levels (IL-1β, TNF-α) and CTX-II.
Conclusions:
- Sustained local delivery of AD-MSC supernatant via an injectable hydrogel effectively modulates joint inflammation and attenuates cartilage degeneration in KOA.
- The hydrogel acts as a crucial delivery vehicle for bioactive factors, supporting a cell-free therapeutic strategy.
- This injectable biomaterial platform presents a promising cell-free therapeutic approach for managing knee osteoarthritis.
