Can hydrogen gas help protect the brain during sepsis?

This mouse study suggests yes - hydrogen gas inhalation significantly reduced brain damage, inflammation, and cell death in septic mice. The treatment also improved survival rates and preserved cognitive function.

How does hydrogen gas protect brain cells from sepsis damage?

Hydrogen appears to activate the Nrf2 antioxidant pathway in brain cells, which boosts natural protective mechanisms. This reduces harmful inflammation and oxidative stress that can kill brain cells during sepsis.

What concentration of hydrogen gas was used in this study?

Researchers used 2% hydrogen gas that mice inhaled for 60 minutes twice daily. This concentration was effective at protecting brain tissue without causing any apparent side effects.

Is hydrogen gas safe for treating sepsis patients?

While this study was in mice, hydrogen gas has been tested safely in humans for other conditions. However, clinical trials in sepsis patients would be needed to confirm safety and effectiveness.

What brain functions improved with hydrogen treatment?

Hydrogen-treated mice showed better memory formation and learning abilities on cognitive tests. The treatment also reduced brain swelling and protected the blood-brain barrier from damage.

Hydrogen Gas Protects Brain from Sepsis Damage in Mice Study

Authors: Lingling Liu, Keliang Xie, Hongguang Chen, Xiaoqing Dong, Yuan Li, Yang Yu, Guolin Wang, Yong-Hao Yu
Journal: Brain Research
Year: 2014
DOI: 10.1016/j.brainres.2014.09.030
Study Type: Mouse
Outcome: Positive
Peer Reviewed: Yes
Country: China
Health Condition: Sepsis
Body System: Nervous System

TL;DR

Inhaling hydrogen gas significantly improved survival and brain function in mice with sepsis-related brain injury.

Key Finding

Inhaling 2% hydrogen gas improved survival rates and protected brain function in septic mice by reducing inflammation, oxidative stress, and brain cell death.

Summary

This study tested whether inhaling hydrogen gas could protect the brain during sepsis (a life-threatening infection) in mice. Researchers gave mice a severe infection and then had them breathe 2% hydrogen gas for one hour at two different times. Compared to untreated infected mice, those that inhaled hydrogen gas had better survival rates, less brain damage, better memory and learning, and reduced swelling in the brain. The protective effects appeared to work by reducing inflammation, decreasing harmful molecules called oxidative stress, and preventing brain cell death.

Practical Takeaway

While this mouse study suggests hydrogen gas inhalation may help protect the brain during severe infections, these results cannot yet be applied to humans. The findings are early-stage and would need to be tested in human clinical trials before any therapeutic use could be recommended. The study also did not report details about sample size or treatment timing, which limits how much can be concluded from these results.

Abstract

During the development of sepsis, the complication in central nervous system (CNS), appearing early and frequently relative to other systems, can obviously increase the mortality of sepsis. Moreover, sepsis survivors also accompany long-term cognitive dysfunction, while the ultimate causes and effective therapeutic strategies of brain injury in sepsis are still not fully clear. We designed this study to investigate the effects of 2% hydrogen gas (H2) on brain injury in a mouse model of sepsis. Male ICR mice were underwent cecal ligation and puncture (CLP) or sham operation. 2% H2 was inhaled for 60min beginning at both 1 and 6h after sham or CLP operation, respectively. H2 concentration in arterial blood, venous blood and brain tissue was detected after H2 inhalation separately. The survival rate was observed and recorded within 7 days after sham or CLP operation. The histopathologic changes and neuronal apoptosis were observed in hippocampus by Nissl staining and TUNEL assay. The permeability of brain-blood barrier (BBB), brain water content, inflammatory cytokines, activities of antioxidant enzymes (SOD and CAT) and oxidative products (MDA and 8-iso-PGF2α) in serum and hippocampus were detected at 24h after sham or CLP operation. The expressions of nucleus and total nuclear factor erythroid 2-related factor 2 (Nrf2) and cytoplasmic heme oxygenase-1(HO-1) in hippocampus were measured at 24h after sham or CLP operation. We assessed their cognitive function via Y-maze and Fear Conditioning test on day 3, 5, 7 and 14 after operation. H2 treatment markedly improved the survival rate and cognitive dysfunction of septic mice. CLP mice showed obvious brain injury characterized by aggravated pathological damage, BBB disruption and brain edema at 24h after CLP operation, which was markedly alleviated by 2% H2 treatment. Furthermore, we found that the beneficial effects of H2 on brain injury in septic mice were linked to the decreased levels of inflammatory cytokines and oxidative products and the increased activities of antioxidant enzymes in serum and hippocampus. In addition, 2% H2 inhalation promoted the expression and transposition of Nrf2 and the expression of HO-1 to mitigate brain injury in sepsis. Thus, the inhalation of hydrogen gas may be a promising therapeutic strategy to relieve brain injury in sepsis.