Hydrogen Gas Protects Fish Brains from Oxygen Loss Damage
- Authors
- Eriko Sato, Naohiro Shimamura, Chikako Saiki, Katsuhisa Sunada, Nobuhiko Miwa, Li Xiao
- Journal
- Antioxidants
- Year
- 2025
- DOI
- 10.3390/antiox14091130
- Study Type
- Medaka (Oryzias latipes)
- Outcome
- Positive
- Peer Reviewed
- Yes
- Country
- Japan
- Health Condition
- Hypoxic Brain Injury
- Body System
- Nervous System
TL;DR
Hydrogen gas protected fish brains from low-oxygen damage by reducing inflammation, oxidative stress, and cell death.
Key Finding
Hydrogen gas treatment significantly reduced brain damage from oxygen deprivation in fish by decreasing tissue damage, suppressing cell death, and lowering inflammatory markers.
Summary
This study examined whether hydrogen gas could protect fish brains from damage caused by lack of oxygen. Researchers exposed medaka fish to low-oxygen conditions, then allowed them to recover in water treated with hydrogen, regular air, or ozone. Fish treated with hydrogen showed less brain damage, reduced cell death, lower inflammation markers, and better swimming and breathing compared to the other groups.
Practical Takeaway
This is an early-stage animal study in fish, not humans, so results cannot be directly applied to people. While the findings suggest hydrogen may have protective effects against oxygen-deprivation injury in brain tissue, much more research—including human studies—would be needed to determine if these benefits apply to humans or what dose and delivery method would be effective.
Abstract
Hypoxia-induced oxidative stress and inflammation in the brain are critical contributors to neurological disorders. Hydrogen gas has emerged as a therapeutic agent with potent antioxidant and anti-inflammatory properties. In this study, we evaluated the protective effects of hydrogen against acute hypoxia-induced brain injuries in medaka. Fish were exposed to hypoxia and then recovered in water bubbled with air, hydrogen, or ozone. LOX-1 hypoxia probe imaging and HIF-1α immunostaining showed persistent tissue hypoxia in the air and ozone groups, which was significantly reduced by hydrogen treatment. Histological analysis revealed extensive vascular congestion in the midbrain after hypoxia, which was markedly alleviated by hydrogen. TUNEL assay demonstrated that hydrogen suppressed hypoxia-induced neuronal apoptosis. Immunohistochemistry and ELISA showed elevated levels of 8-hydroxy-2'-deoxyguanosine (8-OHdG) and proinflammatory markers (COX-2, IL-6, TNF-α) in the brains of air- and ozone-treated fish; these increases were significantly attenuated by hydrogen. ORAC assay confirmed that hydrogen restored brain antioxidant capacity. Behavioral analysis further demonstrated that hydrogen treatment improved locomotor activity and stabilized respiratory function. These results indicate that hydrogen protects medaka against hypoxia-induced oxidative and inflammatory injuries and may represent a promising therapeutic strategy for hypoxia-related neurological disorders.