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J Thorac Cardiovasc Surg. 2019 Oct 30. pii: S0022-5223(19)32355-4. doi: 10.1016/j.jtcvs.2019.09.175. [Epub ahead of print]

Protective effects of a hydrogen-rich solution during cold ischemia in rat lung transplantation.

Author information

1
Department of Thoracic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan.
2
Department of Thoracic Surgery, Graduate School of Medicine, Kyoto University, Kyoto, Japan. Electronic address: fengshic@kuhp.kyoto-u.ac.jp.
3
Department of Thoracic Surgery, Kyoto Katsura Hospital, Kyoto, Japan.
4
MiZ Co, Ltd, Kanagawa, Japan.

Abstract

BACKGROUND:

Molecular hydrogen can reduce the oxidative stress of ischemia-reperfusion injury in various organs for transplantation and potentially improve survival rates in recipients. This study aimed to evaluate the protective effects of a hydrogen-rich preservation solution against ischemia-reperfusion injury after cold ischemia in rat lung transplantation.

METHODS:

Lewis rats were divided into a nontransplant group (n = 3), minimum-ischemia group (n = 3), cold ischemia group (n = 6), and cold ischemia with hydrogen-rich (more than 1.0 ppm) preservation solution group (n = 6). The rats in the nontransplant group underwent simple thoracotomy, and the rats in the remaining 3 groups underwent orthotopic left lung transplantation. The ischemic time was <30 minutes in the minimum-ischemia group and 6 hours in the cold ischemia groups. After 2-hour reperfusion, we evaluated arterial blood gas levels, pulmonary function, lung wet-to-dry weight ratio, and histologic features of the lung tissue. The expression of proinflammatory cytokines was measured using quantitative polymerase chain reaction assays, and 8-hydroxydeoxyguanosine levels were evaluated using enzyme-linked immunosorbent assays.

RESULTS:

When compared with the nontransplant and minimum-ischemia groups, the cold ischemia group had lower dynamic compliance, lower oxygenation levels, and higher wet-to-dry weight ratios. However, these variables were significantly improved in the cold ischemia with hydrogen-rich preservation solution group. This group also had fewer signs of perivascular edema, lower interleukin-1β messenger RNA expression, and lower 8-hydroxydeoxyguanosine levels than the cold ischemia group.

CONCLUSIONS:

The use of a hydrogen-rich preservation solution attenuates ischemia-reperfusion injury in rat lungs during cold ischemia through antioxidant and anti-inflammatory effects.

KEYWORDS:

hydrogen-rich solution; ischemia-reperfusion injury; lung transplantation

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