衰老时钟
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Nature Medicine:张康/陈香美合作开发AI生命时钟,准确预测从婴儿到老年的生物学年龄及疾病风险
生物世界· 2025-10-29 08:30
撰文丨王聪 编辑丨王多鱼 排版丨水成文 为什么有些人年近七旬仍精神矍铄,而有些人才三十出头却已显老态? " 实际年龄 " ( Chronological Age,CA ) 显然无法完全解释这种差异。相对于 实际年龄 ," 生物学年龄 " (Biological Age,BA) 能够更准确地评估一个人的实际衰老 程度, 目前,主要通过 衰老时钟 ( | Aging Clock ) | | 来评估一个人的生物学 | | --- | --- | --- | | 年龄,然而,这些研究通常是在成年人中进行的,这导致了我们在 | | 理解贯穿整个生命周期的 | | 生物学时钟方面仍留有关键空白,尤其是在 | 婴儿期 | 和 儿童期 | 。 作,在国际顶尖医学期刊 Nature Medicine 上发表了题为: A 2025 年 10 月 27 日,温州医科大学/澳门科技大学 张康 教 授团队与 解放军总医院第一医学中心 陈香美 院士团队合 full life cycle biological clock based on routine clinical data and its impact in health and ...
Cell系列综述:干细胞衰老的五大标志
生物世界· 2025-07-14 08:05
编译丨王聪 编辑丨王多鱼 排版丨水成文 体细胞干细胞,通常被称为 成体干细胞 ,通过稳态更新维持组织,并通过再生反应修复组织。因此,这些干细胞群体必须进化出维持自身活力的机制,以适应其 维持的组织在不同生物体中的不同寿命。然而,随着不同寿命的生物体的衰老,这些干细胞功能的衰退在组织稳态受损以及对损伤或疾病的再生能力下降方面表 现得十分明显。 近日,加州大学洛杉矶分校、斯坦福大学和贝勒医学院的研究人员在 Cell 子刊 Cell Stem Cell 上发表了题为: Hallmarks of stem cell aging 的综述论文。 该综述系统性描述了可用来表征干细胞衰老的五个关键标志—— 1) 静息深度 ( depth of quiescence ) ,2) 自我更新倾向 ( self- renewal propensity ) ,3) 子代细胞命运 ( fate of progeny ) ,4) 再生修复能力 ( resilience ) ,5) 群体异质性 ( population heterogeneity ) 。 并进一步探讨了这些标志的变化如何导致干细胞功能的衰退。这些特征不仅为衰老过程提供了见解 ...
一次脑部扫描就能估算衰老速度
Ke Ji Ri Bao· 2025-07-03 00:52
Core Insights - A new tool based on brain scan images has been developed to estimate the aging speed of individuals, which can predict risks of dementia, cardiovascular diseases, lung diseases, and early death [1][2] - The tool, named DunedinPACNI, was trained using MRI images from 860 participants at age 45 and validated with data from 42,583 participants in the UK Biobank and 1,737 brain images from the Alzheimer's Disease Neuroimaging Initiative [1][2] Group 1 - The DunedinPACNI model indicates that individuals who age faster perform worse on cognitive tests and experience quicker hippocampal atrophy, leading to a higher likelihood of developing dementia in the coming years [2] - Accelerated agers not only show significant declines in brain function but also have poorer overall health, with a significantly increased probability of common age-related diseases such as heart disease, stroke, and chronic lung disease [2] - The risk of being diagnosed with chronic diseases within a few years is 18% higher for accelerated agers, and their mortality risk is approximately 40% higher [2] Group 2 - The research team acknowledges that the tool is still some distance from clinical application and requires further validation across different age groups, ethnicities, and equipment environments for stability and accuracy [2]