IRF4は,PGC-1αの重要な熱生成トランスクリプションパートナーである
Xingxing Kong1, Alexander Banks2, Tiemin Liu1
1Division of Endocrinology, Beth Israel Deaconess Medical Center and Department of Genetics, Harvard Medical School, Boston, MA 02215, USA.
Cell
|July 5, 2014
まとめ
インターフェロン調節因子4 (IRF4) は,熱としてカロリーを燃やす遺伝子を活性化することによって,熱生成を促進します. この発見は,IRF4がエネルギー支出を規制し,肥満と闘うための重要な要因であることを明らかにしています.
科学分野:
- 細胞の代謝は細胞の代謝である.
- 分子内分泌学は分子内分泌学である.
- 肥満に関する研究.
背景:
- 茶色脂肪組織 (BAT) は,エネルギーを熱として分散させ,肥満に対抗します.
- 発熱性遺伝子発現は,PGC-1αのような共活性化剤によって調節されます.
- コアクティベーターと連携する特異的な転写因子は,ほとんど不明のままである.
研究 の 目的:
- 熱生成に関与する重要な転写因子を特定する.
- エネルギー支出と寒冷適応の規制におけるIRF4の役割を明らかにする.
主な方法:
- 寒冷およびcAMP刺激下でアディポサイトにおけるIRF4発現を調査した.
- UCP1発現細胞におけるIRF4のノックアウトモデルを使用した.
- Ucp1発現の調節におけるIRF4,PGC-1α,PRDM16の相互作用を調べました.
主要な成果:
- IRF4は,寒さやcAMPによって誘発され,発熱性遺伝子発現,エネルギー消費,寒さ耐性を促進する.
- UCP1 (((+) 細胞におけるIRF4のノックアウトは,熱生成の減少,肥満,そして冷たい不耐性を引き起こす.
- IRF4は,PGC-1αとPRDM16を直接誘導し,PGC-1αと協力してUcp1発現を誘導する.
結論:
- IRF4は熱生成の重要な転写効果因子である.
- IRF4は,エネルギー消費と熱生成のための遺伝子発現プログラムの中央調節器として機能します.
- IRF4は,寒さへの適応と肥満の予防に不可欠です.
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