相关实验视频

Updated: May 17, 2025

Continuous High-resolution Microscopic Observation of Replicative Aging in Budding Yeast

Continuous High-resolution Microscopic Observation of Replicative Aging in Budding Yeast

Published on: August 20, 2013

从动态系统的角度看酵母老化:单细胞轨迹的分析揭示了核大小缩放,蛋白酶体动力学和线粒体形态学之间的显著相互作用

Michael Mobaraki^1,2, Changhui Deng¹, Jiashun Zheng¹

¹Department of Biochemistry and Biophysics, University of California, San Francisco, San Francisco, CA 94158, USA.

bioRxiv : the preprint server for biology

|March 31, 2025

概括

酵母老化揭示了核蛋白酶度可以预测寿命. 细胞大小的增加破坏了核缩放,可能稀释了对长寿至关重要的因素.

科学领域:

细胞衰老研究研究
酵母作为一个模型生物的酵母.
对衰老的动态系统分析.

背景情况:

酵母复制老化是一种细胞自主过程,因此非常适合机理学研究.
了解衰老的特征需要分析单细胞水平的动态变化.

研究的目的:

在单个酵母母细胞中系统分析动态衰老轨迹.
识别关键的衰老特征及其对单个细胞寿命的预测能力.
研究细胞大小,核动力学和蛋白质稳定之间的关系.

主要方法:

利用一种带有可切换遗传程序的工程酵母菌株来捕获子细胞.
采用高通量微流体来追踪数千个单一的酵母母细胞.
使用光记者监测各种生物过程和衰老特征.

主要成果:

蛋白质稳定标志物,特别是中年核蛋白质酶度,最能预测寿命.
细胞大小以线性增长,而核大小最初以同位数缩放,然后随着年龄的增长而不成比例地增长.
核蛋白酶度在衰老过程中迅速下降,这种动态是由核大小变化解释的.

结论:

细胞和核的大小增加可能导致核因子的稀释,导致衰老.
蛋白质酶干扰会影响线粒体,这表明蛋白质酶变化先于线粒体功能障碍.
产生了对衰老研究和模型开发有价值的大规模单细胞动态数据.

更多相关视频

Quantifying Yeast Chronological Life Span by Outgrowth of Aged Cells

Quantifying Yeast Chronological Life Span by Outgrowth of Aged Cells

Published on: May 6, 2009

Using Microfluidic Devices to Measure Lifespan and Cellular Phenotypes in Single Budding Yeast Cells

Using Microfluidic Devices to Measure Lifespan and Cellular Phenotypes in Single Budding Yeast Cells

Published on: March 30, 2017

相关概念视频

Yeast Signaling

Yeast Signaling

Yeasts are single-celled organisms, but unlike bacteria, they are eukaryotes (cells with a nucleus). Cell signaling in yeast is similar to signaling in other eukaryotic cells. A ligand, such as a protein or a small molecule released from a yeast cell, attaches to a receptor on the cell surface. The binding stimulates second-messenger kinases to activate or inactivate transcription factors that further regulate gene expression. Many of the yeast intracellular signaling cascades have similar...