健康な若いボランティアのオゾンへの制御された曝露は,心血管効果を引き起こす
Robert B Devlin1, Kelly E Duncan, Melanie Jardim
1National Health and Environmental Effects, Research Laboratory MD 58D, US EPA, Research Triangle Park, NC 27711, USA. devlin.robert@epa.gov
Circulation
|June 27, 2012
まとめ
短期的なオゾン曝露は炎症を増加させ,心拍数変動を変化させ,オゾン汚染と死亡率の間の関連について生物学的妥当性を提供します. このコントロールされた研究では,オゾン層が明らかになりました.
科学分野:
- 環境衛生 環境衛生 環境衛生
- 心血管生理学 心血管の生理学
- 肺内医学 肺内医学 肺内医学
背景:
- 流行病学的研究は,短期的なオゾン曝露と死亡率の増加を関連付けています.
- オゾンによる心血管効果を調査するヒトへの被曝を制御した研究は限られている.
- 粒子状物質の研究は,大気汚染による死亡率のメカニズムを示しています.
研究 の 目的:
- 健康なヒトにおける制御されたオゾン被曝の心血管および炎症効果を調査する.
- オゾンと死亡率を関連付ける疫学的な発見に生物学的妥当性を与える.
主な方法:
- 23人の健康な個人は,0.3ppmのオゾンまたはきれいな空気に2時間間隔の運動とともに制御された被曝を受けた.
- 心血管のパラメータ (心拍数変動,QT期間) と炎症マーカー (インタールイキン-8,インタールイキン-1B) を評価した.
- 肺機能と肺炎マーカーは,暴露後評価された.
主要な成果:
- オゾンへの曝露は,インターレウキン-8を大幅に増加させ,再極化 (QT期間) を遅らせました.
- 心拍数変動の高周波成分が低下し,自律制御が変化したことを示す.
- 肺の炎症が増加し,オゾン曝露後に肺機能が低下した.
結論:
- 制御されたオゾン曝露は血管の炎症を誘発し,自律的な心拍数制御を変化させ,再極化に影響を与えます.
- 発見は,オゾン曝露と心血管疾患および死亡率を結びつける生物学的メカニズムを裏付けている.
- この研究は,オゾンがヒトの心血管系および肺系に直接的な影響を及ぼす証拠を提供します.
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