健康と代謝疾患におけるヒト脂肪脂の循環の動態
Peter Arner1, Samuel Bernard, Mehran Salehpour
1Department of Medicine, Karolinska University Hospital, SE-141 86 Stockholm, Sweden. peter.arner@ki.se
Nature
|September 28, 2011
まとめ
人間の脂肪細胞は,10年間の寿命で6回トリグリセリドを更新します. 肥満および家族性結合性高脂血症では,脂質の周回量が変化し,代謝疾患の治療に新たな標的を提供している.
科学分野:
- メタボリック生理学 メタボリック生理学
- 人間の脂質代謝
- アディポサイト生物学 アディポサイト生物学
背景:
- トリグリセリドの貯蔵と除去による脂肪組織質量調節が鍵となる.
- 健康と病気におけるヒト脂肪脂質の循環は,未だに十分に理解されていない.
- 脂肪脂質のダイナミクスを評価するために,イン・ビボ (in vivo) の方法が必要です.
研究 の 目的:
- 人体脂肪細胞の脂質周回を in vivo で調査するために.
- 脂質の周回と代謝的健康/病理学的状態との関係を決定する.
- 潜在的治療標的としてアディポサイト脂質周回を特定する.
主な方法:
- 核爆弾実験からの14Cを用いて,脂肪細胞の脂質年齢を決定した.
- 人間の脂肪細胞におけるトリグリセリド再生率を測定した.
- ボディ・マス・インデックスと脂質不全状態との相関性のある脂質周回量.
主要な成果:
- 人間の脂肪細胞は,約10年の寿命でトリグリセリドを6回更新します.
- 脂質の循環は,年齢や性別に関係なく,脂肪細胞のサイズに関係なく安定しています.
- 肥満はトリグリセリドの除去と貯蔵の減少を示し,家族性結合性超脂血症は両方の割合が低下しています.
- 脂質除去は,脂質分解能力と正に相関し,インスリン抵抗性とは逆に相関する.
結論:
- アディポサイト脂質回転の動態は,肥満と脂質不全症において有意に異なっている.
- 高貯蔵/低除去は肥満を助長し,貯蔵/除去の減少は脂質不全を助長する.
- アディポサイト脂質の周回量は,代謝疾患の新たな治療目標を表しています.
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