ARNT/HIF1βの損失は,ヒトの2型糖尿病における遺伝子発現の変化と臓島機能障害を媒介する
Jenny E Gunton1, Rohit N Kulkarni, SunHee Yim
1Joslin Diabetes Center and Harvard Medical School, 1 Joslin Place, Boston, Massachusetts 02215, USA.
Cell
|August 13, 2005
まとめ
転写因子ARNTのレベル低下は,グルコース刺激によるインスリン放出を阻害し,2型糖尿病におけるβ細胞機能障害に貢献します. この発見は,ARNTを強調しています.
科学分野:
- 分子生物学は分子生物学である.
- 内分泌学 エンドックリノロジー
- 遺伝学 遺伝学とは
背景:
- ベータ細胞機能不全は,2型糖尿病の病原化の中心にある.
- 臓の小島における遺伝子発現の変化は,糖尿病に関与しています.
研究 の 目的:
- ヒト2型糖尿病における遺伝子発現の変化,特に転写因子ARNTの役割を調査する.
- ベータ細胞機能とグルコースホメオスタシスに対するARNT濃度の低下の機能的影響を明らかにする.
主な方法:
- オリゴヌクレオチドマイクロアレイと2型糖尿病患者および対照患者からのヒト臓小島のリアルタイムPCR.
- 小型の干渉RNA (siRNA) は,Min6細胞のARNTレベルを低下させる.
- ベータ細胞特異性RNAノックアウトマウスの生成.
主要な成果:
- ARNT発現 (90%) と他の主要なベータ細胞遺伝子 (HNF4alpha,インスリン受容体,IRS2,Akt2) の有意な減少は,2型糖尿病のヒト島群で観察されました.
- Min6細胞の減少したARNTは,グルコース刺激によるインスリン放出を阻害し,遺伝子発現プロフィールを変化させた.
- ベータ細胞特異のARNTノックアウトマウスは,グルコース耐性低下,インスリン分泌量の低下,ヒトの糖尿病島を反映した遺伝子発現の変化を示した.
結論:
- ARNT発現の減少は,ヒトの2型糖尿病における重要な発見である.
- 減少したARNTレベルは,ベータ細胞機能の障害とグルコースの調節不全に寄与する.
- 減少したARNTによって引き起こされる変異遺伝子発現は,2型糖尿病の病理生理学において重要な役割を果たします.
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