Multi-component Microcapsules Derived Spatiotemporal Sonodynamic Reinforcing Therapy against Rheumatoid Arthritis

Area of Science:

• Biomaterials Science
• Nanotechnology
• Rheumatology

Background:

• Rheumatoid arthritis (RA) poses significant challenges in treatment, necessitating innovative therapeutic strategies.
• Microcarrier-based drug delivery systems show promise for RA management.
• Sonodynamic therapy (SDT) offers a targeted approach, but its efficacy can be enhanced.

Purpose of the Study:

• To develop and evaluate a novel spatiotemporal ultrasound-responsive microcapsule carrier for curcumin-based sonodynamic therapy (SDT) in rheumatoid arthritis (RA).
• To investigate the mechanism of action of these microcapsules in vitro and in vivo.
• To assess the therapeutic potential of the developed system for RA treatment.

Main Methods:

• Microfluidic technology was employed to fabricate microcapsules with a hydrogel shell loaded with curcumin and a perfluorocarbon core enriched with oxygen (CUR/O2-MCs).
• Ultrasound stimulation was used to trigger controlled oxygen release and subsequent sonodynamic reactive oxygen species (ROS) production.
• In vitro studies involved assessing ROS generation in fibroblast-like synoviocytes and their apoptosis induction.
• In vivo efficacy was evaluated in collagen-induced arthritis (CIA) rat models, assessing symptom attenuation and joint damage reduction.

Main Results:

• Ultrasound-activated CUR/O2-MCs successfully elevated ROS levels in fibroblast-like synoviocytes, inducing apoptosis.
• The released curcumin and oxygen promoted macrophage repolarization, antiangiogenesis, and hypoxia alleviation, crucial for blocking RA progression.
• In CIA rats, the spatiotemporal sonodynamic microcapsules significantly attenuated RA symptoms and reduced joint damage.

Conclusions:

• The developed ultrasound-responsive multifunctional microcapsules are effective in enhancing sonodynamic therapy for RA.
• This novel system demonstrates significant potential for targeted drug delivery and therapeutic efficacy in RA treatment.
• The spatiotemporal control offered by ultrasound responsiveness provides a promising avenue for advanced RA therapies.