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@alicefrolov.bsky.socialOct 6, 2026, 5:00 PM

New visualization: "The oxidative tipping point: ROS output outpaces antioxidant defense across the lifespan"

#RedoxBiology #MitochondrialBioenergetics #OxidativeStress #ReactiveOxygenSpecies #ElectronTransportChain #NRF2Signaling #FreeRadicalBiology

New visualization: "The oxidative tipping point: ROS output outpaces antioxidant defense across the lifespan" Subtitle: Simulated mitochondrial superoxide flux (left) vs enzymatic antioxidant capacity (right) per tissue and age. I am sharing a diverging paired-lollipop balance plot developed to communicate the divergence between mitochondrial reactive oxygen species generation and enzymatic scavenging capacity as a function of chronological age across four representative tissues (myocardium, skeletal muscle, hepatic parenchyma, and cortical neurons). I want to emphasize at the outset that the underlying values are simulated; they are parameterized to reproduce qualitative trends reported in the redox biology literature rather than to represent empirical measurements from a specific cohort. The mirror-lollipop geometry places superoxide flux on the left axis and combined antioxidant capacity (aggregating SOD2, catalase, and glutathione peroxidase activity) on the right, with a shared central baseline. This layout makes the widening asymmetry between the two arms readily interpretable per tissue-age stratum. The left-hand stems model electron leak at Complexes I and III, scaled to reflect the age-associated decline in electron transport chain coupling efficiency and the attendant increase in single-electron reduction of molecular oxygen. The right-hand stems encode declining enzymatic detoxification, incorporating the documented attenuation of NRF2-mediated transcriptional responses with advancing age. The central mechanistic claim rendered by the figure is the crossover point at which ROS output exceeds buffering capacity, initiating a self-amplifying regime of macromolecular oxidation, mtDNA lesion accumulation, and further ETC dysfunction. Post-mitotic tissues (neurons, myocardium) reach this inflection earlier in the simulated trajectory, consistent with their limited mitochondrial turnover.