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Related Experiment Video

Updated: Nov 3, 2025

Herbal Munziq Ameliorates Myocardial Ischemia-Reperfusion Injury by Inhibiting Inflammation
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Self-Assembling Antioxidants for Ischemia-Reperfusion Injuries.

Toru Yoshitomi1, Yukio Nagasaki2,3,4

  • 1Research Center for Functional Materials, National Institute for Materials Science, Tsukuba, Japan.

Antioxidants & Redox Signaling
|June 2, 2021
PubMed
Summary

Redox nanoparticles (RNPs) offer a novel solution to ischemia-reperfusion (IR) injuries by effectively scavenging reactive oxygen species (ROS) at inflammation sites. These advanced antioxidants overcome limitations of traditional treatments, showing promise for various organ damages.

Keywords:
ischemia–reperfusion injuriesnitroxide radicalsoxidative stressreactive oxygen speciesredox nanoparticles

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Pharmacology

Background:

  • Ischemia-reperfusion (IR) injury is a significant clinical challenge, particularly with an aging population, leading to severe organ damage.
  • Excessive reactive oxygen species (ROS) generation during reperfusion exacerbates IR injury in organs like the kidney, brain, and heart.
  • Conventional low-molecular-weight (LMW) antioxidants face limitations, including adverse effects and rapid clearance, hindering their in vivo efficacy.

Purpose of the Study:

  • To design and develop novel antioxidant nanomedicines to overcome the limitations of traditional antioxidants for treating IR injuries.
  • To investigate the therapeutic potential of redox nanoparticles (RNPs) as next-generation antioxidants.
  • To evaluate the efficacy of pH-sensitive (RNPN) and pH-insensitive (RNPO) RNPs in various IR injury models.

Main Methods:

  • Conjugation of antioxidants to redox polymers to create self-assembling nanoparticles (RNPs).
  • Characterization of RNPs for their ability to suppress uptake in normal cells and accumulate at inflammation sites.
  • Evaluation of ROS scavenging capacity and therapeutic effects of RNPs in preclinical models of kidney, cerebral, myocardial, and intestinal IR injuries.
  • Utilizing pH-sensitive and pH-insensitive properties of different RNP formulations.

Main Results:

  • RNPs effectively scavenge ROS at inflammation sites while minimizing uptake in healthy tissues.
  • RNPN and RNPO demonstrated significant therapeutic benefits in various IR injury models.
  • The pH-dependent and independent characteristics of RNPs allow for targeted and sustained antioxidant activity.
  • RNPs show promise as effective nanomedicines for treating oxidative stress-related disorders.

Conclusions:

  • Redox nanoparticles (RNPs) represent a promising advancement in antioxidant therapy for ischemia-reperfusion injuries.
  • RNPs overcome the limitations of conventional antioxidants, offering improved efficacy and targeted delivery.
  • The development of pH-sensitive and pH-insensitive RNPs provides versatile therapeutic options for diverse clinical applications.