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成熟期依存の既得冠動脈構造変化とアテロゲネシスは,ダール・ナトリウムに敏感な高血圧ラットにおいて認められた
Charles R Kiefer1, James B McKenney, Jane F Trainor
1Department of Hospital Laboratories, UMass Memorial Medical Center, Worcester, Mass 01605-2376, USA. kieferc@ummhc.org
Circulation
|November 6, 2002
まとめ
青春期前の高脂肪食は,ダール・ラットのアテロゲネシスを加速させる. この成熟に依存する効果は,動脈の弾力性に関連しており,後で高ナトリウム/高脂肪食に切り替えると,動脈硬化病変のより急速な発症につながります.
科学分野:
- 心血管科学の研究について
- 栄養科学とは,栄養科学である.
- 高血圧の動物モデル
背景:
- ダール・ナトリウムに敏感な高血圧ラットは,高ナトリウム/高脂肪食でアテロゲン病変を発症します.
- アテロゲネシスに対する食事の影響を理解することは,心臓血管の健康にとって極めて重要です.
- 後の心血管疾患の進行に対する幼児期の栄養の影響については,さらなる調査が必要である.
研究 の 目的:
- 青春期前期の高脂肪食がアテロゲネシスの速度に与える影響を調査する.
- 初期の高脂肪食への曝露が,その後の高ナトリウム/高脂肪食への反応に影響するかどうかを判断する.
- ダイエット誘発性動脈形成における動脈弾性の役割を調査する.
主な方法:
- 53匹のダールSのオスラットは,3~12週間の年齢から標準 (低脂肪/低ナトリウム) と高脂肪/低ナトリウムダイエットグループに分けられました.
- 冠動脈の弾性繊維密度は,9週目に評価されました.
- 12週目には8週間の高ナトリウム/高脂肪食に切り替え,動脈脂質分析を行った.
主要な成果:
- 青春期前の高脂肪食は,冠動脈の弾性繊維密度が9週間減少した.
- 高脂肪食に条件づけられた動物は,高ナトリウム/高脂肪食に切り替えられた後,より広範な動脈硬化病変をより早く発症した.
- 高脂肪食の開始を青春期まで遅らせると,離乳後の条件付けされたラットで観察された加速されたアテロゲネシスが否定されました.
結論:
- 離乳後のネズミの成熟に依存する高脂肪化条件は,アテロゲネシスを加速します.
- この加速は,高ナトリウム/高脂肪ダイエットの開始と関連しています.
- 動脈の弾力性の変化は,この加速動脈形成の基礎となる重要なメカニズムである可能性があります.
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