Can hydrogen gas help treat sepsis-related lung damage?

This mouse study found that hydrogen gas inhalation significantly improved survival rates and reduced lung damage in sepsis. However, human clinical trials are needed to confirm these benefits in patients.

How does hydrogen gas protect against sepsis lung injury?

Hydrogen works by activating the Nrf2 pathway, which boosts the body's natural antioxidant defenses. This increases protective enzymes like SOD and CAT while reducing harmful inflammation markers.

What is the Nrf2 pathway and why is it important for hydrogen therapy?

Nrf2 is a gene that controls the body's antioxidant defense system. This study proved Nrf2 is essential for hydrogen's benefits, as mice lacking this gene received no protection from hydrogen treatment.

Is hydrogen gas inhalation safe for sepsis patients?

While this mouse study showed promising results, human safety and effectiveness studies are needed. Hydrogen gas has been used safely in other medical applications, but sepsis treatment requires clinical trials.

How much did hydrogen therapy improve survival in this study?

Normal mice with sepsis had 40% survival when treated with hydrogen gas compared to 0% survival without treatment. This represents a significant improvement in this severe disease model.

Hydrogen Gas Protects Lungs from Sepsis Damage in Mice Study

Authors: Man Yang, Yang Yu, Keliang Xie, Yong-Hao Yu
Journal: Chinese Critical Care Medicine
Year: 2019
DOI: 10.3760/cma.j.issn.2095-4352.2019.07.013
Study Type: Mouse
Outcome: Positive
Peer Reviewed: Yes
Country: China
Health Condition: Sepsis
Body System: Respiratory

TL;DR

Hydrogen gas (H2) treatment improves survival and reduces lung damage in mice with sepsis by activating a protective pathway involving the Nrf2 protein.

Key Finding

Hydrogen gas inhalation improved survival and reduced lung injury in septic mice, but only in mice with a functional Nrf2 protein—the effect completely disappeared in mice lacking Nrf2, indicating this protein is critical for hydrogen's protective action.

Summary

Researchers gave mice a severe infection (sepsis) and then treated some with hydrogen gas to see if it could help protect their lungs. They compared normal mice to mice genetically engineered to lack a protein called Nrf2. In normal mice, hydrogen gas improved survival rates and reduced lung damage by boosting the body's natural antioxidant defenses (proteins that fight harmful molecules). However, in mice without Nrf2, hydrogen gas had no protective effect, showing that this specific protein is essential for hydrogen's benefits.

Practical Takeaway

This mouse study suggests that hydrogen gas may help protect lungs during severe infection by activating a specific cellular defense pathway, but the findings are limited to animal models and cannot yet be applied to humans. The discovery that Nrf2 is essential for hydrogen's effects may help explain how hydrogen works in the body, though much more research—including human studies—would be needed before any health recommendations could be made.

Abstract

Objective: To investigate the key role of nuclear factor E2-related factor 2 (Nrf2) in the treatment of lung injury in sepsis mice by regulating Nrf2/heme oxygenase-1 (HO-1)/high mobility group protein B1 (HMGB1) pathway. Methods: 120 male wild type (WT) and 120 Nrf2 knockout (Nrf2-KO) ICR mice were randomly divided into Sham group, H2 control group (Sham+H2 group), cecal ligation and puncture (CLP) induced sepsis model group (CLP group) and H2 intervention group (CLP+H2 group), with 30 mice in each group. The sepsis model was reproduced by CLP. The same operation was done in Sham group and Sham+H2 group except CLP. The mice in Sham+H2 group and CLP+H2 group were challenged by 2% H2 for 1 hour at 1 hour and 6 hours after operation respectively, while the mice in Sham group and CLP group only inhaled air. Twenty mice in each group were collected to observe the 7-day survival. The other mice were sacrificed at 24 hours after the reproduction of model, and the lung tissues were harvested. The activities of superoxide dismutase (SOD) and catalase (CAT) and malondialdehyde (MDA) contents were determined by enzyme-linked immunosorbent assay (ELISA). The expressions of HO-1 and HMGB1 were determined by Western Blot, and the positive expression of HO-1 was also detected by immunofluorescence. Results: Compared with Sham groups, the 7-day survival rates of WT and Nrf2-KO mice in CLP groups were significantly lowered [WT: 0% (0/20) vs. 100% (20/20), Nrf2-KO: 0% (0/20) vs. 100% (0/20), both P 0.05]. In WT mice, compared with Sham group, the activities of SOD and CAT in lung tissue of CLP group were decreased significantly [SOD (kU/g): 131.30±28.21 vs. 251.00±22.84, CAT (kU/g): 13.43±1.52 vs. 20.76±1.63, both P 0.05). There was no significant difference in above parameters between CLP+H2 group and CLP group. Conclusions: H2 inhibits lung injury in septic mice through Nrf2/HO-1/HMGB1 pathway. Nrf2 plays a major role in the treatment of septic lung injury by H2.