MYCの発現の減少は,長寿を増加させ,健康を向上させます
Jeffrey W Hofmann1, Xiaoai Zhao1, Marco De Cecco1
1Department of Molecular Biology, Cell Biology and Biochemistry, Brown University, Providence, RI 02912, USA.
Cell
|January 27, 2015
まとめ
マウスにおけるMYC (Myc proto-oncogene) レベルを低下させることで,寿命が延び,健康状態が改善されます. ハプロイン素不足のMycマウスは,年齢関連の疾患に対する耐性を示し,代謝機能と免疫機能が強化された.
科学分野:
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
- 老化に関する研究
背景:
- MYCプロトオンコゲンは,細胞増殖,代謝,アポトーシスの主要な調節体です.
- MYCの緩和は,様々な癌で頻繁に観察され,腫瘍発生を促します.
- 老化と長寿におけるその役割は,まだ完全に理解されていない.
研究 の 目的:
- 寿命と年齢関連の病理に対するMYC濃度の低下の影響を調査する.
- MYCハプロイン不十分症候群と関連した潜在的長寿効果の基礎となる分子メカニズムを探求する.
- 老齢マウスの代謝機能と免疫機能への影響を評価する.
主な方法:
- Mycハプロイン不十分な (Myc(+/-)) マウスの生成と分析.
- 寿命の評価,年齢に関連した病理 (骨粗鬆症,心臓線維症,免疫変異),身体活動,代謝率.
- 遺伝子発現シグネチャーを識別するためのトランスクリプトミック分析.
- タンパク質変換率と主要な栄養素/エネルギー感知経路 (IGF-1,AMPK,AKT,TOR,S6K) の測定
主要な成果:
- Myc(+/-) マウスは,野生型の対照群と比較して,寿命が大幅に長くなっています.
- これらのマウスは,骨粗鬆症,心臓線維症,免疫発現に対する耐性を示した.
- タンパク質翻訳の減少,栄養素感知経路の変化 (IGF-1の低下,AMPKの上昇,AKT/TOR/S6Kの減少),および代謝/免疫遺伝子発現の強化が観察されました.
- 身体活動,代謝率,脂質代謝の改善が認められた.
結論:
- MYC活動の部分的減少 (ハプロイン欠乏症) は,マウスの寿命を延ばし,健康状態を改善します.
- この長寿は,ストレス抵抗性の向上ではなく,タンパク質合成の減少と代謝シグナル伝達の変化に関連しています.
- MYCの投与量は,老化と哺乳類の健康に影響を与える重要な要因です.
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