Breathing Hydrogen Gas May Protect Brain Function After Sepsis

Authors
Journal
Progress om Neuropsychopharmacology and Biological Psychiatry
Year
DOI
10.1016/j.pnpbp.2026.111892
Study Type
Mouse
Outcome
Positive
Peer Reviewed
Yes
Country
China
Health Condition
Sepsis-Associated Encephalopathy
Body System
Central Nervous System

TL;DR

High-concentration hydrogen inhalation improved cognition and myelin integrity after sepsis-associated encephalopathy in mice, apparently by suppressing excessive mTOR activity and promoting oligodendrocyte maturation.

Key Finding

Inhaling 67% hydrogen gas reduced cognitive impairment in septic mice by suppressing an overactive mTOR signaling pathway, which allowed protective myelin-forming cells in the brain to mature and rebuild damaged nerve insulation.

Summary

This mouse study looked at whether breathing high-concentration hydrogen gas (67%) could protect the brain during sepsis-associated encephalopathy (SAE) — a condition where serious infection leads to brain dysfunction and lasting memory problems. Researchers found that in mice with SAE, a cellular pathway called mTOR became overactive, which blocked the normal development of oligodendrocytes (cells that form the protective myelin sheath around nerve fibers) and damaged brain wiring in the prefrontal cortex. Mice that inhaled 67% hydrogen gas showed better cognitive performance, healthier myelin structure, and improved brain adaptability compared to untreated SAE mice.

Practical Takeaway

This is an animal study using very high-concentration hydrogen gas (67%), so results cannot be directly applied to humans or to lower-concentration hydrogen water products. Early evidence suggests hydrogen may support brain health during severe illness through a specific cellular mechanism, but clinical trials in humans would be needed before drawing any conclusions about real-world benefit.

Abstract

Sepsis-associated encephalopathy (SAE) commonly elicits long-lasting cognitive deterioration. Although hydrogen inhalation exerts protective effects in sepsis, its underlying mechanisms remain unclear. Dysregulated oligodendrocyte maturation and myelin architectural defects are pivotal pathological drivers of cognitive deficits across multiple neurological disorders. This study investigates whether high-concentration(67%) hydrogen gas protects against SAE by promoting oligodendrocyte maturation and myelination in the medial prefrontal cortex (mPFC). A CLP-induced mouse SAE model was established; mice received hydrogen inhalation at 1 and 4 h postoperatively plus daily 2-h sustained inhalation. To verify the underlying mechanism, mTOR agonist NV-5138 and antagonist rapamycin were used for pathway validation. The Morris water maze paradigm was adopted to quantify cognitive proficiency and conduct spatial training, which characterizes activity-dependent myelin remodeling. Western blotting, immunofluorescence staining, and transmission electron microscopy were performed to evaluate mTOR phosphorylation, oligodendrocyte maturation, and myelin integrity. The study indicated that mTOR hyperactivation in the medial prefrontal cortex of SAE mice impeded oligodendrocyte precursor cell differentiation, triggered hypomyelination, and ultimately precipitated cognitive dysfunction. 67% hydrogen inhalation markedly mitigated SAE-induced cognitive dysfunction by restraining mTOR overactivation to promote oligodendrocyte maturation and myelin reconstruction; rapamycin treatment exerted synergistic neuroprotective efficacy. Furthermore, SAE substantially abrogated spatial training-initiated myelin plasticity, whereas hydrogen therapy partially restored such brain adaptive capacity. In summary, hydrogen promotes oligodendrocyte maturation and myelination by suppressing mTOR pathway activity and restoring cortical myelin plasticity, thereby ameliorating cognitive dysfunction in SAE. This work reveals a previously unrecognized neuroprotective mechanism of hydrogen and provides actionable therapeutic targets for SAE clinical intervention.