Zwitterionic-based cyclic brush polymer nanomicelles with improved lubrication and antioxidation properties

Area of Science:

• Biomaterials Science
• Nanotechnology
• Rheumatology

Background:

• Osteoarthritis (OA) involves cartilage degradation and inflammation, necessitating treatments that improve joint lubrication and reduce inflammation.
• Current OA therapies often lack comprehensive strategies to address the complex joint microenvironment.
• Developing multifunctional materials is key to enhancing therapeutic outcomes for OA.

Purpose of the Study:

• To design and synthesize novel multifunctional cyclic brush polymer (CP) nanomicelles.
• To evaluate the lubricating properties and drug-carrying capacity of these nanomicelles.
• To assess the therapeutic potential of CP nanomicelles loaded with resveratrol (CP@RSV) in an oxidative stress model relevant to OA.

Main Methods:

• Synthesis of cyclic brush polymers (CPs) with zwitterionic poly(sulfobetaine methacrylate) (PSBMA) brushes and a hydrophobic PHEMA core.
• Tribological and wear testing to assess lubrication performance under shear stress.
• Encapsulation of resveratrol (RSV) into CP nanomicelles to form CP@RSV.
• In vitro studies to evaluate cytocompatibility, reactive oxygen species (ROS) scavenging, and mitochondrial function modulation.

Main Results:

• CP nanomicelles demonstrated effective lubrication, significantly reducing friction coefficient and surface wear.
• CP@RSV nanomicelles successfully encapsulated resveratrol and showed excellent cytocompatibility.
• In vitro studies confirmed CP@RSV's ability to eliminate ROS and reverse mitochondrial dysfunction, mitigating oxidative stress.
• The developed nanomicelles effectively modulated the oxidative stress microenvironment.

Conclusions:

• Multifunctional CP nanomicelles integrate enhanced lubrication with anti-inflammatory and antioxidant drug delivery.
• CP@RSV nanomicelles represent a promising dual-action strategy for osteoarthritis treatment by addressing lubrication and oxidative stress.
• This approach offers a novel therapeutic avenue for remodeling the damaged joint microenvironment in OA.