Mitochondrial reactive oxygen species generation and oxidative stress pathway (mROS pathway)

Mitochondrial reactive oxygen species (mROS) are primarily generated as byproducts of the electron transport chain (ETC) during oxidative phosphorylation, specifically at Complexes I and III (Murphy, 2009, Biochem J). Under physiological conditions, mROS serve as critical signaling molecules for cellular adaptation and homeostasis; however, an imbalance between ROS production and antioxidant defense leads to oxidative stress (Sies et al., 2017, Nat Rev Mol Cell Biol). This state causes cumulative damage to mitochondrial DNA, membrane lipids, and proteins, contributing to the progression of neurodegenerative diseases like Parkinson's and Alzheimer's, as well as cardiovascular disorders and aging (Dan Dunn et al., 2015, Rev Physiol Biochem Pharmacol). Pharmacological intervention typically focuses on mitochondria-targeted antioxidants, such as MitoQ or SkQ1, which accumulate in the mitochondrial matrix to neutralize superoxide and prevent lipid peroxidation (Smith & Murphy, 2010, Free Radic Biol Med). While promising, targeting this pathway is challenging because complete suppression of ROS can impair essential cellular functions like mitogen-activated protein kinase signaling and host defense, necessitating a narrow therapeutic window to maintain homeostatic signaling (Zorov et al., 2014, Physiol Rev).

Other names

Mitochondrial ROSmROS productionMitochondrial oxidative stressMitochondrial redox signaling

Modulation of mitochondrial redox state through direct scavenging of superoxide and hydroxyl radicals, inhibition of specific electron transport chain complexes to reduce electron leakage, or activation of the Nrf2-mediated antioxidant response pathway.