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提高循环L-Kynurenine促进衰老老鼠的脆弱性
Mia Y Kawaida1, Abigail L Tice1, Samuel Alvarez1
1Department of Applied Physiology and Kinesiology, The University of Florida, Gainesville, Florida, USA.
升高的L-Kynurenine (L-Kyn) 会使衰老的脆弱性恶化,但骨肌肉的PGC1α过度表达可以防止这种衰退. 这种保护与肌肉 kynurenine 氨基转移酶 (KAT) 表达和代谢的增加有关.
科学领域:
- 老龄化和新陈代谢
- 骨肌肉生理学 骨肌肉生理学
- 线粒体功能的功能
背景情况:
- L-Kynurenine (L-Kyn),一个托芬代谢物,随着年龄的增长而增加,并与减少身体功能和脆弱性有关.
- 骨肌中的Kynurenine氨基转移酶 (KATs) 降解L-Kyn,并由PGC1α调节.
研究的目的:
- 研究是否高的L-Kyn会加剧与年龄相关的身体,肌肉和线粒体功能下降.
- 为了确定骨肌特异性PGC1α (MCK-PGC1α) 转基因表达是否能防止与年龄相关的L-Kyn病理.
主要方法:
- 研究老年小鼠 (MCK-PGC1α转基因和野生类型的 littermates,n=262) 纵向研究.
- 饮食干预增加了L-Kyn水平.
- 评估了身体功能 (耐力,力量,速度,活动),肌肉功能 (肌底收缩) 和线粒体能量.
主要成果:
- 在雄性小鼠中,L-Kyn饮食降低了耐力和活动,在雌性小鼠中降低了步行速度.
- 在野生型小鼠中,L-Kyn增加了脆弱性,但这被MCK-PGC1α表达减轻了.
- 与野生类型相比,MCK-PGC1α小鼠表现出更高的KAT表达和改善的线粒体功能.
结论:
- 骨肌肉PGC1α过度表达减轻了老年小鼠L-Kyn诱导的身体虚弱的恶化.
- 这种保护作用部分是由于骨肌肉L-Kyn代谢通过由PGC1α驱动的KAT表达增加而增强.
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