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非ヒトの霊長類の老化による大動脈の硬さにおける性別の差異のメカニズム
Hongyu Qiu1, Christophe Depre, Kaushik Ghosh
1Cardiovascular Research Institute, Department of Cell Biology and Molecular Medicine, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, 185 S Orange Ave, Newark, NJ 07103, USA.
Circulation
|August 1, 2007
まとめ
老化により,エラスティンの損失とコラーゲンのタイプの変化により,雌よりも雄のサルでは大動脈の硬さが増加します. これらの血管の性質の変化は,種によって大きく異なっています.
科学分野:
- 心血管の老化に関する研究
- 比較生理学 比較生理学について
- 血管生物学 血管生物学とは
背景:
- 大動脈の硬さは年齢とともに増加します.
- 老化に関連した血管の変化は,性別によって異なることがあります.
研究 の 目的:
- 猿の老化に関連する大動脈の硬さにおける性別の違いを調査する.
- 胸前大動脈の細胞外マトリックスの変化を分析する.
主な方法:
- 若年,老年,雄性,雌性猿 (マカカ・ファシキュラリス) の主動脈圧と直径のイン・ビヴォ測定.
- コラーゲン密度,コラーゲンタイプ,エラスティン密度,およびグリケーションの最終製品を含む細胞外マトリックス成分の分析.
- ネズミのコラーゲンに対する老化効果との比較.
主要な成果:
- 大動脈の硬さ (圧力ストレスの弾性モジュール) は,年老いた雌よりも年老いた雄の類人猿において著しく増加した.
- エラスティンの密度は,男性のみで老化とともに減少した.
- 高齢のオスは,コラーゲン1型と3型が増加した老齢ラットとは異なり,コラーゲン3型が減少し,コラーゲン8型が増加した.
結論:
- 高齢のオスのサルにおける大動脈の硬さが増加することは,エラスティンの減少と特定のコラーゲンイソフォームの変化と関連しています.
- 老化が大動脈のコラーゲンタイプにどのように影響するかについては,種間の違いがあります.
- コラーゲン密度やグリケーションの最終製品などの要因は,性による硬さの違いを説明できませんでした.
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