Distinct and additive effects of calorie restriction and rapamycin in aging skeletal muscle.

Distinct and additive effects of calorie restriction and rapamycin in aging skeletal muscle.
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DOI:
10.1038/s41467-022-29714-6
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发表时间:
2022-04-19
影响因子:
16.6
通讯作者:
--
中科院分区:
综合性期刊1区
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保持骨骼肌功能对维持老年生活质量至关重要。热量限制(CR)有效地延长健康和寿命,但在人类中基本上是无法实现的,使得“CR模拟物”引起了极大的兴趣。CR靶向以mTORC1为中心的营养感应途径。mTORC1抑制剂雷帕霉素被认为是一种潜在的CR模拟物,并被证明可以抵消年龄相关的肌肉损失。因此,我们测试了雷帕霉素是否通过与CR类似的机制来减缓肌肉衰老。在这里,我们表明,长期CR和雷帕霉素出乎意料地显示不同的基因表达谱在老年小鼠骨骼肌,尽管都有利于衰老的肌肉。此外,CR改善了营养不敏感的小鼠的肌肉完整性,持续的肌肉mTORC 1活性和雷帕霉素提供了额外的好处,CR在自然老化的小鼠肌肉。我们的结论是,雷帕霉素和CR发挥不同的,复合作用,在老化的骨骼肌,从而打开平行干预,以对抗肌肉老化的可能性。抗衰老干预卡路里限制(CR)被认为是通过营养感应多蛋白复合物mTORC 1起作用。在这里,作者表明mTORC1抑制剂雷帕霉素和CR使用很大程度上不同的机制来减缓小鼠肌肉衰老。
Preserving skeletal muscle function is essential to maintain life quality at high age. Calorie restriction (CR) potently extends health and lifespan, but is largely unachievable in humans, making “CR mimetics” of great interest. CR targets nutrient-sensing pathways centering on mTORC1. The mTORC1 inhibitor, rapamycin, is considered a potential CR mimetic and is proven to counteract age-related muscle loss. Therefore, we tested whether rapamycin acts via similar mechanisms as CR to slow muscle aging. Here we show that long-term CR and rapamycin unexpectedly display distinct gene expression profiles in geriatric mouse skeletal muscle, despite both benefiting aging muscles. Furthermore, CR improves muscle integrity in mice with nutrient-insensitive, sustained muscle mTORC1 activity and rapamycin provides additive benefits to CR in naturally aging mouse muscles. We conclude that rapamycin and CR exert distinct, compounding effects in aging skeletal muscle, thus opening the possibility of parallel interventions to counteract muscle aging. The anti-aging intervention calorie restriction (CR) is thought to act via the nutrient-sensing multiprotein complex mTORC1. Here the authors show that the mTORC1-inhibitor rapamycin and CR use largely distinct mechanisms to slow mouse muscle aging.
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