Demystifying Oxidative Stress.

Area of Science:

• Biomedical Science
• Pathophysiology
• Pharmacology

Background:

• The hypothesis of reactive oxygen species (ROS) causally implicating disease emerged in 1956.
• The oxidative stress theory has not yielded significant therapeutic advancements, limiting antioxidant use to complementary medicine.
• Current understanding of ROS's role in disease is challenged by a lack of high-level clinical evidence.

Purpose of the Study:

• To review the limitations of the oxidative stress theory of disease.
• To explore epistemological challenges in current ROS research.
• To propose future research directions for validating ROS targets in disease, incorporating personalized medicine.

Main Methods:

• Literature review of clinical evidence for antioxidant efficacy.
• Analysis of the oxidative stress theory's shortcomings.
• Conceptual framework for understanding ROS signaling dysregulation.

Main Results:

• High-level clinical evidence for antioxidant effectiveness in disease prevention is lacking.
• The traditional redox balance model, suggesting ROS reduction is always beneficial, is questioned.
• Five mechanisms for physiological ROS signaling dysfunction are identified, contributing to disease.

Conclusions:

• The current oxidative stress model is insufficient for diagnosing or treating ROS-related diseases.
• Dysfunctional ROS signaling, not just high ROS levels, is implicated in disease.
• Causal validation of ROS sources, toxifiers, and targets is crucial for developing effective therapies for ROSopathies.