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運動訓練は,ペースによって引き起こされる慢性心不全のウサギの中央の抗酸化機構による同情的なアウトフローを正常化する
Lie Gao1, Wei Wang, Dongmei Liu
1Department of Cellular and Integrative Physiology, University of Nebraska Medical Center, 985850 Nebraska Medical Center, Omaha, NE 68198-5850, USA. lgao@unmc.edu
Circulation
|June 6, 2007
まとめ
運動トレーニングは,脳幹の酸化ストレスを軽減することによって,慢性心不全 (CHF) の自律的機能を改善します. この研究は,運動が抗酸化酵素を調節し,交感神経の活動を低下させ,CHFのウサギのバロレフレクスの感受性を高めることを示しています.
科学分野:
- 心血管生理学 心血管の生理学
- 神経科学は神経科学である.
- 運動科学は運動科学である.
背景:
- ロストラル腹側髄の酸化ストレスが,慢性心不全 (CHF) のシンパト興奮に寄与する.
- 運動トレーニングは,CHF患者で抗酸化効果があることが知られている.
研究 の 目的:
- 長期の運動が,中央の抗酸化メカニズムを通じて,CHFにおける自律的活動を改善するかどうかを調査する.
- 運動訓練が中央の抗酸化経路経由でCHFにおける自律機能に有益な効果をもたらすという仮説を検証する.
主な方法:
- 実験は,ニュージーランド白ウサギで,血液動力学および交感神経活動のモニタリングのための機器を用いて行われました.
- バロレフレクスの感度が評価されました. 運動トレーニングを実施し,ロストラル腹側髄膜における抗酸化酵素 (CuZnスーパーオキシドジスミュータゼ) とプロオキシダント酵素 (NAD(P) H酸化酵素サブユニットgp91(phox)) のタンパク質発現を測定した.
- CuZn超酸化物ディスミュータゼの中央過剰発現は,同情神経活動に対するその影響を評価するために実施されました.
主要な成果:
- 運動訓練は腎交感神経の活動を著しく低下させ,CHFのウサギのバロレフレクスの感受性を高めました.
- 運動トレーニングは,ロストラル・ベントロラテル・メドウラのCuZnスーパーオキシド・ディスミュータゼ発現を増加させ,NAD(P) Hオキシダゼサブユニットgp91(phox) タンパク質発現を減少させた.
- CuZnスーパーオキシドディスミュータゼの中央過剰発現は,CHFウサギの基礎腎交感神経の活性を,投与量に依存して低下させた.
結論:
- 中央の抗酸化機構の向上とプロ酸化機構の抑制は,CHFにおける自律的活動に対する運動トレーニングの有益な効果に寄与する.
- 中央の抗酸化経路は,運動訓練が慢性心不全における自律機能障害を改善する重要なメカニズムです.
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