Inhaled Hydrogen Gas Therapy for Prevention of Lung Transplant-Induced Ischemia/Reperfusion Injury in Rats

Atsunori Nakao, Chien-Sheng Huang, Meinoshin Okumura, Naobumi Tochigi, Norihisa Shigemura, Sungsoo Lee, Timothy R. Billiar, Tomohiro Kawamura, Yoshiya Toyoda

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DOI: 10.1097/TP.0b013e3181fe1357 DOI is the universal ID for this study.

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Successful abrogation of ischemia/reperfusion (I/R) injury of lung grafts could significantly improve short- and long-term outcomes for lung transplant (LTx) recipients. Hydrogen gas has potent antioxidant and antiapoptotic properties and has been recently used in number of experimental and clinical studies. The purpose of this research was to investigate whether inhaled hydrogen gas could reduce graft I/R injury during lung transplantation. Orthotopic left LTxs were performed in syngenic Lewis rats. Grafts were perfused with and stored in low potassium dextran solution at 4°C for 6 hr. The recipients received 100% O2 or 98% O2 with 2% N2, 2% He, or 2% H2 during surgery and 1 hr after reperfusion. The effects of hydrogen were assessed by functional, pathologic, and molecular analysis. Gas exchange was markedly impaired in animals exposed to 100% O2, 2% N2, or 2% He. Hydrogen inhalation attenuated graft injury as indicated by significantly improved gas exchange 2 hr after reperfusion. Graft lipid peroxidation was significantly reduced in the presence of hydrogen, demonstrating antioxidant effects of hydrogen in the transplanted lungs. Lung cold I/R injury causes the rapid production and release of several proinflammatory mediators and epithelial apoptosis. Exposure to 2% H2 significantly blocked the production of several proinflammatory mediators and reduced apoptosis with induction of the antiapoptotic molecules B-cell lymphoma-2 and B-cell lymphoma-extra large. Treatment of LTx recipients with inhaled hydrogen can prevent lung I/R injury and significantly improve the function of lung grafts after extended cold preservation, transplant, and reperfusion.

Publish Year 2010
Country United States
Rank Positive
Journal Transplantation
Primary Topic Lung
Secondary TopicSurgery/Transplantation
Model Rat
Tertiary TopicTransplantation/Graft Injury
Vehicle Gas
pH N/A
Application Inhalation
Comparison Helium