General cellular redox systems

General cellular redox systems refer to the integrated network of enzymes, small molecules, and signaling pathways that maintain the balance between oxidizing agents and antioxidant defenses (NIH, 2023). This system is primarily composed of the glutathione (GSH) system, the thioredoxin (Trx) system, and various antioxidant enzymes such as superoxide dismutase (SOD), catalase, and peroxiredoxins (Redox Bioscience, 2025). These components work in concert to protect cellular macromolecules—DNA, proteins, and lipids—from oxidative damage while simultaneously utilizing reactive oxygen species (ROS) as critical signaling molecules for processes like cell proliferation and immune response (MDPI, 2021). Dysregulation of redox homeostasis is a central feature of many diseases; for instance, chronic oxidative stress contributes to neurodegeneration and cardiovascular disease, while many cancer cells exploit upregulated antioxidant pathways to survive high metabolic ROS levels (NIH, 2021). Therapeutic strategies targeting these systems range from Nrf2 activators that boost endogenous defenses to thioredoxin reductase inhibitors that induce lethal oxidative stress in malignant cells (NIH, 2011). However, the ubiquitous nature and delicate balance of these systems present significant challenges, as non-specific modulation can lead to reductive stress or interfere with essential physiological signaling (MDPI, 2021). Furthermore, the spatiotemporal dynamics of ROS production mean that broad-spectrum antioxidants often lack the precision required for clinical efficacy, leading modern drug development to focus on specific molecular nodes within the redox network (Redox Bioscience, 2025).

Other names

Cellular redox homeostasisAntioxidant defense systemsRedox signaling pathwaysRedox metabolism

Modulation of antioxidant enzymes, replenishment of glutathione stores, inhibition of thioredoxin reductase, or activation of the Nrf2-Keap1 pathway to enhance cellular defense against reactive oxygen species (ROS) or induce lethal oxidative stress in cancer cells.