アディポサイトのO2消費量の増加はHIF-1αを誘発し,肥満における炎症とインスリン抵抗性を引き起こします
Yun Sok Lee1, Jung-Whan Kim2, Olivia Osborne1
1Department of Medicine, Division of Endocrinology and Metabolism, University of California, San Diego, La Jolla, CA 92093, USA.
Cell
|June 7, 2014
まとめ
肥満は脂肪組織の低酸素によってインスリン抵抗性を引き起こす. ANT2またはHIF-1αをブロックすると,インスリン感受性およびグルコース耐性を回復し,これを防ぐことができます.
科学分野:
- メタボリック疾患は,
- 肥満に関する研究.
- アディポス組織生物学
背景:
- 脂肪組織の低酸素と炎症は,肥満に起因するインスリン抵抗性に関連しています.
- このカスケードを開始する正確な分子機構は,まだ完全に理解されていません.
研究 の 目的:
- 高脂肪食 (HFD) の摂取と脂肪組織の低酸素症,炎症,およびインスリン抵抗性を結びつける初期の分子現象を解明する.
- 治療的介入のための主要な分子標的を特定する.
主な方法:
- ハイ脂肪ダイエット (HFD) の飼育モデルを用いて,ネズミの飼育モデルを用いた.
- アディポサイト呼吸,酸素消費,および低酸素誘導因子1-α (HIF-1α) の誘導を調査した.
- 飽和脂肪酸効果を媒介するアデニンヌクレオチドトランスロカゼ2 (ANT2) の役割を調べました.
- ANT2およびHIF-1αの遺伝的または薬学的阻害が代謝パラメータに与える影響を評価した.
主要な成果:
- HFDの栄養は,結合されていないアディポサイト呼吸を誘導し,低酸素とHIF-1αの活性化につながった.
- 飽和脂肪酸は,ミトコンドリアのタンパク質であるANT2を刺激し,分離呼吸を引き起こした.
- ANT2またはHIF-1αの抑制により,脂肪組織の炎症とインスリン抵抗性が改善された.
- インスリン感受性の回復とグルコース耐性の改善は,介入後に観察されました.
結論:
- アディポサイトミトコンドリア機能障害は,ANT2と飽和脂肪酸によって媒介され,肥満では低酸素と炎症を誘発する.
- ANT2またはHIF-1αをターゲットにすることは,肥満に起因するインスリン抵抗性に対する潜在的な治療戦略です.
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