Taurine as a Natural Antioxidant: From Direct Antioxidant Effects to Protective Action in Various Toxicological Models.
Level 5 - mechanism / opinion, no new human data
Narrative review of mechanistic, in vitro, and animal toxicological literature with no human clinical trial data.
PubMed 34942978 · doi:10.3390/antiox10121876
What was done
Narrative review evaluating literature on taurine's antioxidant properties, contrasting direct free radical scavenging with indirect regulatory mechanisms (mitochondrial electron transport chain stabilization, membrane protection, inhibition of ROS-producing enzymes, and modulation of transcription factors like Nrf2 and NF-kB) across mammalian and avian in vitro and in vivo toxicological models.
What was found
No quantitative trial effect sizes were reported in the abstract. Direct radical scavenging by taurine is limited and largely confined to tissues with high taurine concentrations (>15-20 mM, such as heart and eye). Taurine deficiency compromises the mitochondrial electron transport chain and elevates free radical generation, whereas taurine exhibits protective antioxidant effects across diverse toxicological models via indirect redox maintenance and transcription factor modulation.
Why it matters
Clarifies that taurine's primary protective role against oxidative stress is mediated by mitochondrial stabilization and cellular signaling pathways rather than broad direct free radical scavenging.
Limits
The review relies on narrative synthesis rather than a systematic methodology. Findings are derived primarily from in vitro, avian, and animal toxicological models, leaving clinical efficacy, optimal human dosing, and direct human outcomes unmeasured.
Cited by
- supports Taurine differs from other amino acids in that it is not incorporated into proteins and circulates as a free amino acid.