Journal
LABORATORY INVESTIGATION
Volume 99, Issue 6, Pages 793-806Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/s41374-019-0187-z
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Funding
- Japan Society for the Promotion of Science (JSPS) [16K16616, 16H03267]
- Grants-in-Aid for Scientific Research [16H03267, 16K16616] Funding Source: KAKEN
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Although inhibition of epidermal growth factor receptor (EGFR)-mediated cell signaling by the EGFR tyrosine kinase inhibitor gefitinib is highly effective against advanced non-small cell lung cancer, this drug might promote severe acute interstitial pneumonia. We previously reported that molecular hydrogen (H-2) acts as a therapeutic and preventive antioxidant. Here, we show that treatment with H-2 effectively protects the lungs of mice from severe damage caused by oral administration of gefitinib after intraperitoneal injection of naphthalene, the toxicity of which is related to oxidative stress. Drinking H-2-rich water ad libitum mitigated naphthalene/gefitinib-induced weight loss and significantly improved survival, which was associated with a decrease in lung inflammation and inflammatory cytokines in the bronchoalveolar lavage fluid. Naphthalene decreased glutathione in the lung, increased malondialdehyde in the plasma, and increased 4-hydroxy-2-nonenal production in airway cells, all of which were mitigated by H-2-rich water, indicating that the H-2-rich water reverses cellular damage to the bronchial wall caused by oxidative stress. Finally, treatment with H-2 did not interfere with the anti-tumor effects of gefitinib on a lung cancer cell line in vitro or on tumor-bearing mice in vivo. These results indicate that H-2-rich water has the potential to improve quality of life during gefitinib therapy by mitigating lung injury without impairing anti-tumor activity.
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