Cellular redox systems and mitochondrial energetics

Cellular redox systems and mitochondrial energetics represent the integrated biochemical framework responsible for energy transduction and the maintenance of oxidative homeostasis within the cell. At the core of this system is the mitochondrial electron transport chain (ETC), which couples electron transfer to the pumping of protons, ultimately driving ATP synthesis via the F1Fo-ATP synthase [1][2]. Parallel to energy production, cellular redox systems—including the glutathione, thioredoxin, and nicotinamide adenine dinucleotide (NAD+/NADH) pools—regulate the levels of reactive oxygen species (ROS) to prevent oxidative damage to lipids, proteins, and DNA [3]. Impairment of mitochondrial function or a breakdown in redox control is implicated in a wide range of diseases, such as Parkinson's disease, Type 2 diabetes, and various forms of cancer [4][5]. Pharmacological modulation of these pathways involves diverse approaches, ranging from the use of mitochondrial-targeted antioxidants like MitoQ to the inhibition of metabolic enzymes to exploit the unique bioenergetic vulnerabilities of malignant cells [6]. Citations: [1] Murphy, M. P. (2009) Biochem J; [2] Wallace, D. C. (2005) Genetics; [3] Hanschmann, E. M., et al. (2013) Antioxid Redox Signal; [4] Lin, M. T., & Beal, M. F. (2006) Nature; [5] Weinberg, S. E., & Chandel, N. S. (2015) Nat Chem Biol; [6] Smith, R. A., et al. (2012) Ann N Y Acad Sci.

Other names

Redox homeostasisMitochondrial bioenergeticsOxidative phosphorylation systemCellular metabolismMitochondrial respiratory chain

Modulation of the electron transport chain, scavenging of reactive oxygen species (ROS), induction of antioxidant response elements via Nrf2, and stabilization of mitochondrial membranes and cardiolipin.