Administration of the Nrf2-ARE activators sulforaphane and carnosic acid attenuates 4-hydroxy-2-nonenal-induced mitochondrial dysfunction ex vivo.
Level 5 - mechanism / opinion, no new human data
Animal experiment and ex vivo bench research without human participants
PubMed 23275005 · doi:10.1016/j.freeradbiomed.2012.12.011
What was done
Young adult male CF-1 mice received a single intraperitoneal injection of either sulforaphane (5.0 mg/kg), carnosic acid (1.0 mg/kg), or vehicle. Forty-eight hours post-administration, cerebral cortical mitochondria were isolated and exposed ex vivo to 30 μM 4-hydroxynonenal (4-HNE) for 15 minutes at 37 °C. The researchers measured cortical heme oxygenase-1 (HO-1) mRNA expression, complex I- and complex II-driven mitochondrial respiration, and covalent 4-HNE binding to mitochondrial proteins by Western blot.
What was found
Both sulforaphane and carnosic acid significantly increased cortical HO-1 mRNA expression at 48 hours (p < 0.05). Prior in vivo administration of either compound significantly attenuated 4-HNE-induced inhibition of complex I respiration (p < 0.05), whereas only carnosic acid protected complex II respiration. Both compounds significantly reduced 4-HNE protein adduct formation (p < 0.05). Specific baseline and post-treatment numerical values were not provided in the abstract.
Why it matters
These findings show that systemic pharmacological activation of the Nrf2-ARE cytoprotective pathway can enhance the intrinsic resistance of brain mitochondria against lipid peroxidation toxicity.
Limits
This is a preclinical rodent study using an ex vivo toxin challenge model. The exact sample sizes (n) are not reported in the abstract, and whether these protective effects translate to in vivo traumatic brain injury models or human clinical contexts was not determined.
Cited by
- supports Animal studies show that sulforaphane activation of the Nrf2 protective pathway persists for at least two days.