インスリン受容体は,ゲノム全体のプロモーターと関連し,遺伝子発現を調節する
Melissa L Hancock1, Rebecca C Meyer1, Meeta Mistry2
1Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.
Cell
|April 9, 2019
まとめ
インスリン受容体 (IR) は核に移動し,代謝や糖尿病などの病気に関与する遺伝子を調節します. この発見はインスリンに 新しい経路を開示しています
科学分野:
- 分子生物学
- 代謝の調節
- ゲノミクス
背景:
- インスリン受容体 (IR) のシグナル伝達は代謝制御に不可欠ですが,その長期的な効果は完全に理解されていません.
- IRシグナリングの調節不良は,糖尿病,神経変性,がんなどの慢性疾患に関連しています.
研究 の 目的:
- インスリンシグナル伝達による長期的効果の仕組みを明らかにする.
- インスリン受容体の核機能と遺伝子調節におけるその役割を調査する.
主な方法:
- IR結合部位を特定するための全ゲノムクロマチン免疫降水 (ChIP)
- インスリンへの反応による遺伝子発現の変化の分析
- コイムノプレシピテーションとウェスタン・ブロッティングを用いたタンパク質相互作用の調査.
主要な成果:
- インスリン受容体 (IR) はRNAポリメラーゼIIと結合し,遺伝子プロモーターに全ゲノムで結合することが判明した.
- IRによって調節される標的遺伝子は,脂質代謝,タンパク質合成,糖尿病や癌を含む疾患に関与しています.
- IR染色体結合はインスリン濃度によって調節され,宿主細胞因子-1 (HCF-1) によってインスリン抵抗性が低下する.
結論:
- インスリン受容体 (IR) は,核内の遺伝子転写の調節に直接的な役割を果たします.
- 新しいHCF-1依存経路は,細胞表面シグナル伝達と長期的な遺伝子発現の変化を結びつけ,インスリンの転写効果を媒介する.
- これは,新陳代謝の健康と病気の病原性に関連したインスリン作用の新しい分子機構を特定します.
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