分支链氨基酸积累为衰老相关的分泌表现型提供燃料
Yaosi Liang1, Christopher Pan1, Tao Yin1
1Department of Pharmacology and Cancer Biology, Duke University Medical Center, Durham, NC, 27710, USA.
Advanced science (Weinheim, Baden-Wurttemberg, Germany)
|November 15, 2023
概括
改变的分支链氨基酸 (BCAA) 代谢通过激活mTORC1.1.驱动细胞衰老和炎症. 调节BCAA水平可能为与年龄有关的疾病提供新的治疗方法.
科学领域:
- 生物化学 生物化学
- 细胞生物学 细胞生物学
- 衰老研究研究 衰老研究
背景情况:
- 分链氨基酸 (BCAA) 对于蛋白质合成和新陈代谢至关重要.
- 它们在哺乳动物中的精确生理作用和调节机制尚未完全理解.
- 细胞衰老和与衰老相关的分泌表型 (SASP) 与衰老和炎症有关.
研究的目的:
- 为了阐明BCAA代谢和细胞衰老之间的联系.
- 确定将BCAA失调与SASP联系起来的分子机制.
- 探索针对BCAA代谢在衰老和炎症性疾病中的治疗潜力.
主要方法:
- 在衰老细胞中研究了BCAA载体 (SLC6A14,SLC6A15) 和催化酶 (BCAA转氨酶1) 的表达.
- 利用转基因Drosophila模型研究在衰老过程中保存的BCAA调节通路.
- 采用小鼠衰老模型来评估阻止BCAA积累对炎症的影响.
主要成果:
- 发现通过转运器激活和酶下调调节改变了BCAA代谢,在衰老细胞中提升了细胞内BCAA.
- 证明了高水平的BCAA激活mTORC1,建立了SASP.
- 展示了BCAA调节器在Drosophila的衰老和衰老表型中的保留作用.
- 证实抑制BCAA积累可以减少老鼠衰老模型中的炎症.
结论:
- 一个新的机制将BCAA代谢变化与细胞衰老和SASP诱导联系起来.
- 这一途径涉及BCAA载体,BCAA转氨酶1和mTORC1,在不同物种中保持.
- 准BCAA代谢是一种有前途的治疗策略,用于与年龄相关的和炎症性疾病.
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