Protective Effects of Fish Oil Against Brain Impairment in Rats with Chronic Ethanol-Induced Liver Damage Involving the NRF2 Pathway and Oxidative Stress.
Level 5 - mechanism / opinion, no new human data
Animal research (male Wistar rat model)
PubMed 40563336 · doi:10.3390/antiox14060704
What was done
Male Wistar rats received either a control liquid diet or an ethanol liquid diet for 8 weeks, with 25% or 57% of dietary fat replaced by fish oil across control and ethanol groups (C, CF25, CF57, E, EF25, EF57). The investigators assessed cognitive performance via Y-maze and novel object recognition tests. Brain tissue from the prefrontal cortex and hippocampus was examined for astrocyte and microglial activation markers (GFAP, Iba-1), oxidative markers (GSH, catalase), β-amyloid (Aβ1-42) clearance, and components of the NRF2/KEAP1 signaling pathway (p-NRF2, nqo1 mRNA).
What was found
The abstract reports directional outcomes without exact numerical values or effect sizes. Ethanol feeding impaired Y-maze and novel object recognition performance, increased GFAP-positive astrocytes and Iba-1-positive microglia, decreased prefrontal cortex GSH and phosphorylated NRF2, and downregulated nqo1 mRNA in the prefrontal cortex and hippocampus. Replacement of dietary fat with fish oil (EF25 and EF57) reversed the cognitive deficits, lowered GFAP and Iba-1 expression, promoted Aβ1-42 clearance, escalated catalase activity, and increased p-NRF2 and nqo1 mRNA expression compared to ethanol feeding alone.
Why it matters
This study provides mechanistic evidence in a rodent model that omega-3-rich fish oil can counteract ethanol-induced neuroinflammation and cognitive deficits, potentially by upregulating antioxidant defenses through the NRF2/KEAP1 pathway.
Limits
The findings are derived entirely from an animal model using only male rats, precluding direct clinical translation. The abstract omits sample sizes, exact numerical data, confidence intervals, and statistical values. Hepatic parameters corresponding to the liver damage model were not detailed in the abstract.
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