The effects of inhaling hydrogen gas on macrophage polarization, fibrosis, and lung function in mice with bleomycin-induced lung injury

• Aokage, Toshiyuki

• Seya, Mizuki

• Hirayama, Takahiro

• Nojima, Tsuyoshi

• Iketani, Masumi

• Ishikawa, Michiko

• Terasaki, Yasuhiro

• Taniguchi, Akihiko

• Miyahara, Nobuaki

• Nakao, Atsunori

• Ohsawa, Ikuroh

• Naito, Hiromichi

抄録

Background : Acute respiratory distress syndrome, which is caused by acute lung injury, is a destructive respiratory disorder caused by a systemic inflammatory response. Persistent inflammation results in irreversible alveolar fibrosis. Because hydrogen gas possesses anti-inflammatory properties, we hypothesized that daily repeated inhalation of hydrogen gas could suppress persistent lung inflammation by inducing functional changes in macrophages, and consequently inhibit lung fibrosis during late-phase lung injury. <br> Methods : To test this hypothesis, lung injury was induced in mice by intratracheal administration of bleomycin (1.0 mg/kg). Mice were exposed to control gas (air) or hydrogen (3.2% in air) for 6 h every day for 7 or 21 days. Respiratory physiology, tissue pathology, markers of inflammation, and macrophage phenotypes were examined. <br> Results : Mice with bleomycin-induced lung injury that received daily hydrogen therapy for 21 days (BH group) exhibited higher static compliance (0.056 mL/cmH(2)O, 95% CI 0.047-0.064) than mice with bleomycin-induced lung injury exposed only to air (BA group; 0.042 mL/cmH(2)O, 95% CI 0.031-0.053, p = 0.02) and lower static elastance (BH 18.8 cmH(2)O/mL, [95% CI 15.4-22.2] vs. BA 26.7 cmH(2)O/mL [95% CI 19.6-33.8], p = 0.02). When the mRNA levels of pro-inflammatory cytokines were examined 7 days after bleomycin administration, interleukin (IL)-6, IL-4 and IL-13 were significantly lower in the BH group than in the BA group. There were significantly fewer M2-biased macrophages in the alveolar interstitium of the BH group than in the BA group (3.1% [95% CI 1.6-4.5%] vs. 1.1% [95% CI 0.3-1.8%], p = 0.008). <br> Conclusions The results suggest that hydrogen inhalation inhibits the deterioration of respiratory physiological function and alveolar fibrosis in this model of lung injury.

収録刊行物

• BMC Pulmonary Medicine

  BMC Pulmonary Medicine 21 (1), 339-, 2021-10-31

  BMC

キーワード

• Acute respiratory distress syndrome
• Bleomycin-induced lung injury
• Macrophage
• Molecular hydrogen
• Lung fibrosis

詳細情報

• CRID: 1050853113751640320
• NII論文ID: 120007170516
• ISSN: 14712466
• DOI: 10.1186/s12890-021-01712-2
• Web Site: https://ousar.lib.okayama-u.ac.jp/62859
• Web Site: https://link.springer.com/content/pdf/10.1186/s12890-021-01712-2.pdf
• Web Site: https://link.springer.com/article/10.1186/s12890-021-01712-2/fulltext.html
• 本文言語コード: en
• 資料種別: journal article
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