相关实验视频

Updated: May 16, 2025

Methods to Assess Subcellular Compartments of Muscle in C. elegans

Methods to Assess Subcellular Compartments of Muscle in C. elegans

Published on: November 13, 2014

在WRN缺陷细胞中线粒体NAD+的降低与功能障碍的增殖相关

Sofie Lautrup¹, Shi-Qi Zhang¹, Shinichiro Funayama^2,3

¹Department of Clinical Molecular Biology, University of Oslo and Akershus University Hospital, Lørenskog 1478, Norway.

|April 3, 2025

概括

沃纳综合征 (WS) 与代谢问题和衰老有关. 提高WRN基因缺陷的细胞中的NAD+水平减少了衰老标志物和改善了线粒体,但WRN

科学领域:

遗传学和衰老研究研究
代谢障碍代谢障碍代谢障碍
细胞的新陈代谢

背景情况:

沃纳综合征 (WS) 是一种加速衰老的疾病,是由WERNER (WRN) 基因突变引起的,其特征是代谢功能障碍.
以前的研究将耗尽的NAD+与线粒体损伤和代谢妥协联系起来.
在WS中线粒体NAD+的具体变化及其病理影响仍然不清楚.

研究的目的:

研究WRN在细胞衰老和新陈代谢中的作用.
为了确定WRN缺乏对线粒体NAD+水平的影响.
探索NAD+增强作为WS相关病理的治疗策略.

主要方法:

利用来自WS患者的中介质干细胞 (MSC) 和纤维细胞以及WRN淘汰模型.
给药的尼古丁胺基核糖体来增加NAD+水平.
评估了细胞衰老,线粒体功能和NAD+水平 (间接通过PARP活性).
分析了NAD+救援通路酶的表达,并对WRN和NMNAT进行了ChIP-seq.

主要成果:

失去了WRN增加了MSCs的衰老,与代谢和衰老途径失调有关.
增加NAD+可减少衰老,并改善WRN缺乏细胞中的线粒体配置.
由于WRN缺乏,线粒体NAD+减少,NMNAT1和NAMPT的表达变化.
发现WRN可能与NMNAT共同调节,影响染色质稳定性和DNA代谢.

结论:

在WS中,WRN缺乏有助于衰老和代谢功能障碍,部分是通过NAD+失调.
NAD+增强显示了减轻一些WS细胞表型的潜力.
WRN在独立于NAD+水平的细胞增殖中起着至关重要的作用,突出了除了代谢调节之外的关键功能.

关键词:

它们是NAD+NAD+NAD.沃尔纳综合征是什么意思沃尔纳综合征是什么意思线粒体中的线粒体.过早的衰老过早的衰老它们的扩散和扩散.

更多相关视频

Imaging and Quantifying Mitochondrial Morphology in C. elegans During Aging

Imaging and Quantifying Mitochondrial Morphology in C. elegans During Aging

Published on: January 17, 2025

Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry

Assessing Mitochondrial Function in Sciatic Nerve by High-Resolution Respirometry

Published on: May 5, 2022

相关概念视频

Abnormal Proliferation

Abnormal Proliferation

Under normal conditions, most adult cells remain in a non-proliferative state unless stimulated by internal or external factors to replace lost cells. Abnormal cell proliferation is a condition in which the cell's growth exceeds and is uncoordinated with normal cells. In such situations, cell division persists in the same excessive manner even after cessation of the stimuli, leading to persistent tumors. The tumor arises from the damaged cells that replicate to pass the damage to the...

The Nucleolus

The Nucleolus

The nucleolus is the most prominent substructure of the nucleus. When it was first discovered, it was considered to be an isolated organelle that forms fibrils and granules. In 1931, the relationship between the nucleolus and chromosomes was first described by Heitz. He observed that the appearance and size of nucleolus varies depending on the stage of the cell cycle. He also noticed constricted regions on different chromosomes clustered together at definite cell cycle stages. These regions,...

Mitochondria

Mitochondria

Mitochondria are eukaryotic cellular organelles that are known to produce energy through a process called oxidative phosphorylation. Besides their primary function, mitochondria are involved in various cellular processes, including cell growth, differentiation, signaling, metabolism, and senescence. Age-related changes cause a decline in mitochondrial quality and integrity due to increased mitochondrial mutations and oxidative damage. Thus, aging can severely impact mitochondrial functions,...

Replicative Cell Senescence

Replicative Cell Senescence

Replicative cell senescence is a property of cells that allows them to divide a finite number of times throughout the organism's lifespan while preventing excessive proliferation. Replicative senescence is associated with the gradual loss of the telomere — short, repetitive DNA sequences found at the end of the chromosomes. Telomeres are bound by a group of proteins to form a protective cap on the ends of chromosomes. Embryonic stem cells express telomerase — an enzyme that adds...

Electron Transport Chain: Complex I and II

Electron Transport Chain: Complex I and II

The mitochondrial electron transport chain (ETC) is the main energy generation system in the eukaryotic cells. However, mitochondria also produce cytotoxic reactive oxygen species (ROS) due to the large electron flow during oxidative phosphorylation. While Complex I is one of the primary sources of superoxide radicals, ROS production by Complex II is uncommon and may only be observed in cancer cells with mutated complexes.
ROS generation is regulated and maintained at moderate levels necessary...

Mitochondrial Membranes

Mitochondrial Membranes

A single mitochondrion is a bean-shaped organelle enclosed by a double-membrane system. The outer membrane of mitochondria is smooth and contains many porins - the integral membrane transporters. Porins enable free diffusion of ions and small uncharged molecules through the outer mitochondrial membrane but limit the transport of molecules larger than 5000 Daltons. Further, the outer mitochondrial membrane forms a unique structure called membrane contact sites with other subcellular organelles,...