脂肪組織のATP結合カセットトランスポーターA1は,高密度リポプロテインのバイオゲネシス in vivoに寄与する
Soonkyu Chung1, Janet K Sawyer, Abraham K Gebre
1Department of Pathology/Section on Lipid Sciences, Wake Forest School of Medicine, Winston-Salem, NC, USA.
Circulation
|September 21, 2011
まとめ
脂肪組織のATP結合カセットトランスポーターA1 (ABCA1) は,高密度リポプロテイン (HDL) の生物発生に不可欠です. マウスでそれを削除すると,新生HDL粒子の形成を阻害することによって,HDLコレステロールを低下させます.
科学分野:
- バイオケミストリー バイオケミストリー
- 分子生物学は分子生物学である.
- 脂質代謝 脂質代謝とは
背景:
- 脂肪組織は,主要なフリーコレステロール貯蔵庫である.
- ATP結合カセットトランスポーターA1 (ABCA1) は,高密度リポプロテイン (HDL) の生物発生に不可欠です.
- HDLの産生における脂肪組織ABCA1の役割は,体内では不明である.
研究 の 目的:
- 脂肪組織ABCA1がHDLバイオゲネシスに与えるインビボの貢献を調査する.
- コレステロールホメオスタシスとHDL代謝に対するアディポサイト特異のABCA1デリエーションの影響を明らかにする.
主な方法:
- アディポサイト特有のABCA1ノックアウトマウスの生成 (ABCA1(-A/-A)).
- 血のHDLコレステロールとアポリポプロテインA-Iレベルを測定する.
- 自由コレステロールの含有量と脂肪組織からのコレステロール流出の評価.
- 新生HDL粒子の形成とHDLトレーサーの吸収の分析.
主要な成果:
- アディポサイトABCA1の消去により,プラズマのHDLコレステロールとアポリポプロテインA-Iが著しく低下しました.
- ABCA1欠乏脂肪組織は,自由コレステロールの増加とアポリポプロテインA-Iへの流出障害を示した.
- 脂肪組織ABCA1欠乏症は,新生HDL粒子の形成,特により大きなHDL粒子を減少させた.
- 既存のHDLおよびHDLトレーサー代謝へのコレステロール流出は,アディポサイトABCA1の欠失によって影響を受けませんでした.
結論:
- 脂肪組織ABCA1依存のコレステロール流出は,全身的なHDL生物発生に不可欠です.
- 脂肪組織ABCA1は,脂肪細胞のコレステロールの恒常性において重要な役割を果たします.
- アディポサイトABCA1欠乏による新生HDL粒子の形成の減少は,血HDL濃度を下げます.
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