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Targeted Ruthenium-Based Anti-Inflammatory Nanoagent for Enhanced Rheumatoid Arthritis Treatment.

Ziwei Zhao1, Hao Xiong2, Jinyong Wu1

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Summary

This study introduces a novel ruthenium-based nanosystem (RuFOMs-FA) for rheumatoid arthritis (RA) treatment. It effectively reduces inflammation and joint damage by targeting M1 macrophages and restoring oxygen balance.

Keywords:
anti‐inflammatoryorganosilicaphotothermalrheumatoid arthritisruthenium

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Rheumatology

Background:

  • Rheumatoid arthritis (RA) involves joint inflammation driven by hypoxia and reactive oxygen species (ROS).
  • Current treatments aim to inhibit inflammation but often face challenges with efficacy and safety.
  • Targeting macrophage polarization is a promising strategy for RA therapy.

Purpose of the Study:

  • To develop a targeted ruthenium-based nanosystem (RuFOMs-FA) for rheumatoid arthritis (RA) treatment.
  • To investigate the dual-stage macrophage regulatory mechanism of RuFOMs-FA for RA therapy.
  • To evaluate the therapeutic efficacy of RuFOMs-FA in alleviating RA symptoms in a rat model.

Main Methods:

  • Formulation of ruthenium clusters-loaded F127-organosilica micelles with folic acid modification (RuFOMs-FA).
  • Assessment of photothermal properties and M1 macrophage targeting via folic acid-mediated pathways.
  • Evaluation of nanoagent's enzyme-mimicking activities (catalase and superoxide dismutase) for ROS scavenging and oxygen production.
  • In vivo study using a rat RA model to assess alleviation of hypoxia, inflammation, and cartilage destruction.

Main Results:

  • RuFOMs-FA demonstrated high photothermal conversion efficiency (55.3%) upon NIR irradiation, inducing M1 macrophage death.
  • The nanosystem exhibited catalase-like and superoxide dismutase-like activities, scavenging ROS and producing oxygen.
  • This process promoted the polarization of M1 to M2 macrophages, reducing inflammation.
  • In vivo, RuFOMs-FA effectively alleviated hypoxia, inflammation, and cartilage destruction in a rat RA model.

Conclusions:

  • RuFOMs-FA acts through a two-stage macrophage regulatory mechanism for RA treatment.
  • The developed nanosystem shows potential as a novel noble metal-based anti-inflammatory agent for RA.
  • RuFOMs-FA offers an efficient and safe therapeutic candidate for rheumatoid arthritis.