Polyelectrolyte-Functionalized NanoMOFs for Highly Efficient Aqueous Lubrication and Sustained Drug Release

Area of Science:

• Materials Science
• Biomedical Engineering
• Nanotechnology

Background:

• Osteoarthritis (OA) poses significant challenges requiring advanced therapeutic strategies.
• Current treatments often lack sustained drug delivery and effective joint lubrication.
• Nanomaterials offer potential for targeted drug delivery and enhanced lubrication.

Purpose of the Study:

• To create a hybrid material combining polyelectrolyte brushes and drug-loaded nanoMOFs.
• To evaluate the material's efficacy as an aqueous lubricant for osteoarthritis therapy.
• To assess sustained drug release and biocompatibility for synergistic OA treatment.

Main Methods:

• Grafting poly(3-sulfopropyl methacrylate potassium salt) (PSPMK) brushes onto UiO-66-NH2 metal-organic frameworks (MOFs).
• Loading aspirin (AS) as an anti-inflammatory drug into the modified MOFs (AS-UiO-66-NH2@PSPMK).
• Assessing lubrication properties (friction coefficient, wear volume) and drug release kinetics.

Main Results:

• The hybrid material demonstrated over 70% reduction in friction coefficient and 99% reduction in wear volume.
• Achieved high load-carrying capacity and long-term durability in aqueous lubrication.
• Showcased sustained aspirin release and good biocompatibility with human chondrocytes.

Conclusions:

• The AS-UiO-66-NH2@PSPMK hybrid material shows promise as a multifunctional joint lubricant.
• This approach offers a synergistic therapy for osteoarthritis through lubrication and sustained drug delivery.
• Polyelectrolyte brush modification provides a versatile platform for enhancing MOF performance.