衰老的特征表现出特定器官的时间特征
Nicholas Schaum1,2, Benoit Lehallier2, Oliver Hahn2
1Institute for Stem Cell Biology and Regenerative Medicine, Stanford University School of Medicine, Stanford, CA, USA.
Nature
|July 17, 2020
概括
衰老涉及多个器官的复杂,相互关联的过程. 这项研究揭示了老化过程中的协调基因表达转移和免疫细胞激活,为系统性健康下降提供了洞察力.
科学领域:
- 老年学
- 分子生物学
- 免疫学
背景情况:
- 衰老是全球疾病和死亡的主要危险因素.
- 了解衰老机制对于改善健康寿命至关重要.
- 之前的研究确定了关键的衰老损伤类别,但缺乏全身分析.
研究的目的:
- 在整个生物体的背景下全面分析多个器官的衰老动态.
- 识别和描述衰老过程中的基因表达和蛋白质水平变化.
- 研究组织特异性和系统性衰老过程之间的相互作用.
主要方法:
- 在10个不同年龄的小鼠中对17个器官和血蛋白质的大量RNA测序.
- 整合来自Tabula Muris Senis的单细胞RNA测序数据
- 对基因表达轨迹和蛋白质水平相关性的分析.
主要成果:
- 在衰老过程中发现了线性和非线性基因表达的变化,这些变化被分为细胞外基因组,蛋白质平衡,线粒体功能和免疫反应等功能组.
- 在不同组织中观察到相似的基因表达模式,其发病和大小各不相同.
- 检测到广泛的免疫细胞激活,特别是脂肪组织中的T和B细胞,从中年开始.
- 在组织基因表达变化和血蛋白水平之间发现了强烈的相关性.
结论:
- 衰老在器官内部和器官之间是异步的, 但却表现出协调的分子特征.
- 免疫系统的激活, 特别是脂肪组织, 是衰老的一个关键特征.
- 系统循环反映了特定组织的衰老变化,为健康下降提供了潜在的生物标志物.
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