酵母におけるニトロキシドホルミシス:4-ヒドロキシ-TEMPOは老化と細胞周期を調節する
Mateusz Mołoń1, Patrycja Kielar2, Eliza Molestak3
1Faculty of Biology, Natural Protection, and Sustainable Development, University of Rzeszow, al. Tadeusza Rejtana 16C, 35-959 Rzeszów, Poland.
Molecules (Basel, Switzerland)
|January 28, 2026
まとめ
強力な抗酸化剤である4-ヒドロキシ-TEMPOは、酵母の細胞老化と遺伝子発現に影響を与える。一部の株では老化を遅らせ、他の株では老化を促進するホルミシス応答を示し、TEMPOと比較して毒性が低い。
科学分野:
- 生化学;分子生物学;遺伝学
背景:
- 4-ヒドロキシ-TEMPOは、抗酸化特性を持つ水溶性ニトロキシドラジカルである。;スーパーオキシドジスムターゼ模倣薬として機能し、活性酸素種を消去する。;酸化損傷は、老化や様々な細胞プロセスに関与している。
研究 の 目的:
- 出芽酵母における4-ヒドロキシ-TEMPOの生理学的および転写工学的影響を調査すること。;細胞増殖、DNA含有量、慢性老化への影響を理解すること。;TEMPOとの影響と毒性を比較すること。
主な方法:
- 転写再プログラムを研究するためのRNA-Seq解析。;野生型および変異株(sod1Δ、sod2Δ、yap1Δ、rad52Δ)を利用した。;主要な転写変化を確認するためのRT-qPCR。
主要な成果:
- 4-ヒドロキシ-TEMPOは生育を阻害し、DNA含有量(G1期)を変化させた。;株依存的に慢性老化を調節し、ホルミシスを示した。;TEMPOとは異なり、翻訳毒性を低減させ、多重リボソームを維持し、ユニークな転写プログラムを誘導した。
結論:
- 4-ヒドロキシ-TEMPOは、酵母において複雑なレドックス依存性転写応答を引き起こす。;老化に対する二相性、遺伝子型特異的なホルミシス効果を示し、遺伝子保護を提供する。;TEMPOと比較して、有利な毒性プロファイルを示す。
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