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Injectable hydrogel encapsulating siMMP13 with anti-ROS and anti-apoptotic functions for osteoarthritis treatment
Zhongyin Ji1,2,3, Xiaobin Ren4, Jiayan Jin1,2
1Department of Orthopaedic Surgery, Sir Run Run Shaw Hospital, Zhejiang University School of Medicine, No. 3, Qingchun Road East, Hangzhou, 310016, P.R. China.
Background:
Osteoarthritis (OA) is a degenerative joint disease characterized by the progressive degeneration of articular cartilage, leading to pain, stiffness, and loss of joint function. The pathogenesis of OA involves multiple factors, including increased intracellular reactive oxygen species (ROS), enhanced chondrocyte apoptosis, and disturbances in cartilage matrix metabolism. These processes contribute to the breakdown of the extracellular matrix (ECM) and the loss of cartilage integrity, ultimately resulting in joint damage and dysfunction. RNA interference (RNAi) therapy has emerged as a promising approach for the treatment of various diseases, including hATTR and acute hepatic porphyria. By harnessing the natural cellular machinery for gene silencing, RNAi allows for the specific inhibition of target genes involved in disease pathogenesis. In the context of OA, targeting key molecules such as matrix metalloproteinase-13 (MMP13), which plays a critical role in cartilage degradation, holds great therapeutic potential.
Results:
In this study, we developed an innovative therapeutic approach for OA using a combination of liposome-encapsulated siMMP13 and NG-Monomethyl-L-arginine Acetate (L-NMMA) to form an injectable hydrogel. The hydrogel served as a delivery vehicle for the siMMP13, allowing for sustained release and targeted delivery to the affected joint. Experiments conducted on destabilization of the medial meniscus (DMM) model mice demonstrated the therapeutic efficacy of this composite hydrogel. Treatment with the hydrogel significantly inhibited the degradation of cartilage matrix, as evidenced by histological analysis showing preserved cartilage structure and reduced loss of proteoglycans. Moreover, the hydrogel effectively suppressed intracellular ROS accumulation in chondrocytes, indicating its anti-oxidative properties. Furthermore, it attenuated chondrocyte apoptosis, as demonstrated by decreased levels of apoptotic markers.
Conclusion:
In summary, the injectable hydrogel containing siMMP13, endowed with anti-ROS and anti-apoptotic properties, may represent an effective therapeutic strategy for osteoarthritis in the future.
Insights
This study presents an injectable hydrogel for osteoarthritis treatment, combining siMMP13 and L-NMMA. The hydrogel effectively reduces cartilage degradation, oxidative stress, and chondrocyte apoptosis in mouse models.
Area of Science:
- Biomedical Engineering
- Regenerative Medicine
- Molecular Biology
Background:
- Osteoarthritis (OA) is a degenerative joint disease driven by cartilage breakdown, oxidative stress, and chondrocyte apoptosis.
- RNA interference (RNAi) offers targeted gene silencing for diseases like OA, with MMP13 inhibition being a key strategy.
- Current OA treatments lack efficacy in halting disease progression.
Purpose of the Study:
- To develop an injectable hydrogel for sustained delivery of siMMP13 (small interfering RNA targeting MMP13) for OA treatment.
- To evaluate the therapeutic efficacy of the siMMP13-loaded hydrogel in a mouse model of OA.
- To assess the hydrogel's impact on cartilage degradation, oxidative stress, and chondrocyte apoptosis.
Main Methods:
- Development of an injectable hydrogel encapsulating liposome-siMMP13 and NG-Monomethyl-L-arginine Acetate (L-NMMA).
- Administration of the hydrogel in a destabilization of the medial meniscus (DMM) mouse model of OA.
- Histological analysis of cartilage structure, proteoglycan content, oxidative stress markers, and apoptosis in chondrocytes.
Main Results:
- The composite hydrogel demonstrated significant inhibition of cartilage matrix degradation in DMM mice.
- Histological evaluation revealed preserved cartilage structure and reduced proteoglycan loss.
- The treatment effectively suppressed intracellular reactive oxygen species (ROS) and attenuated chondrocyte apoptosis.
Conclusions:
- The injectable hydrogel loaded with siMMP13 exhibits promising therapeutic potential for osteoarthritis.
- The hydrogel's combined anti-ROS and anti-apoptotic properties contribute to its efficacy in preserving cartilage.
- This approach offers a novel strategy for OA management by targeting key pathological pathways.
