Tuning the Fire: Context-Dependent Mitochondrial ROS Signaling, Mitohormesis, and Redox-Modulating Interventions.
Level 5 - mechanism / opinion, no new human data
Narrative review of mechanistic concepts without new human data
PubMed 42352333 · doi:10.3390/biom16060867
What was done
This narrative review synthesized mechanistic concepts regarding mitochondrial reactive oxygen species (mtROS) signaling and mitohormesis. It evaluated contextual determinants of mtROS function (chemical species identity, site of production, temporal dynamics, redox-buffering capacity, and metabolic state), reviewed action mechanisms of natural redox-modulating compounds (polyphenols, isothiocyanates, terpenoids, alkaloids, and quinones), and examined tissue- and state-dependent redox profiles in neurodegenerative, metabolic, cardiovascular, and neoplastic diseases.
What was found
The abstract reports conceptual and mechanistic conclusions without quantitative numbers. Natural redox-modulating compounds act primarily via pro-hormetic mechanisms (including mild electron transport chain perturbation, NRF2/KEAP1 activation, mitochondrial membrane potential modulation, mitochondrial quality control, and NAD+/NADPH regulation) rather than direct free-radical scavenging. Optimal redox strategies are tissue- and state-dependent, explaining the failure of non-specific antioxidant supplementation.
Why it matters
Provides a mechanistic framework explaining why non-specific antioxidant clinical trials often fail and argues for compartment-targeted, biomarker-guided, and temporally optimized redox therapies.
Limits
The paper is a narrative review and conceptual framework providing no primary experimental data, quantitative effect sizes, systematic search criteria, or clinical trials.
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