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Bioactivation is a metabolic process that transforms less reactive substances into highly reactive metabolites, initiating tissue toxicity. This transformation can lead to various toxic effects, including carcinogenesis and teratogenesis. Reactive metabolites are classified into two main types: electrophiles and free radicals.Electrophiles are electron-deficient species and are produced primarily by the enzyme cytochrome P-450 during the metabolism of compounds containing carbon, nitrogen, or...
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Oxidative and nitrosative damage in multiple sclerosis.

Tim Prozorovski1, Sven G Meuth2, Hans-Peter Hartung1,3,4

  • 1Department of Neurology, Medical Faculty and University Hospital Düsseldorf, Heinrich-Heine University, Düsseldorf.

Current Opinion in Neurology
|April 9, 2026
PubMed
Summary
This summary is machine-generated.

Reactive oxygen and nitrogen species (ROS and RNS) play dual roles in multiple sclerosis (MS), acting as both signaling and damaging molecules. Understanding redox mechanisms is crucial for developing effective antioxidative therapies for MS.

Keywords:
antioxidative therapiesimmune system ferroptosismultiple sclerosisneuroinflammation

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Area of Science:

  • Neuroimmunology
  • Oxidative Stress Biology
  • Cellular Signaling

Background:

  • Reactive oxygen and nitrogen species (ROS and RNS) are recognized as critical signaling molecules with implications in various physiological and pathological processes.
  • Neuroinflammation, particularly in conditions like multiple sclerosis (MS), is increasingly linked to the damaging effects of ROS and RNS.
  • Oxidative and nitrosative damage, alongside redox regulation and ferroptosis, are key areas of investigation in MS pathogenesis.

Purpose of the Study:

  • To review recent advances in understanding oxidative and nitrosative damage in multiple sclerosis (MS).
  • To discuss the role of redox regulation and ferroptosis in the initiation and progression of MS.
  • To highlight the dual role of ROS and RNS as both damaging and signaling molecules in the context of neuroinflammation.

Main Methods:

  • This is an opinion article, synthesizing current knowledge and recent findings.
  • Discussion focuses on established and emerging concepts in redox biology and cell death mechanisms.
  • Literature review of studies investigating oxidative damage, redox regulation, and ferroptosis in MS models and patients.

Main Results:

  • Modulating redox processes in brain or immune cells significantly impacts MS severity in experimental models.
  • Circulating markers of oxidative damage show potential as supplementary diagnostic tools for MS subtypes.
  • While oxidative damage is a known driver of MS, the precise molecular redox mechanisms remain incompletely understood.

Conclusions:

  • Oxidative damage is a well-established contributor to multiple sclerosis (MS) pathogenesis.
  • A significant knowledge gap exists regarding the specific molecular redox mechanisms driving MS initiation and progression.
  • This lack of understanding hinders the development of successful antioxidative therapies for MS.