衰老期间的中粒体不活化可以在人类细胞中得到挽救
Sweta Sikder1, Songjoon Baek1, Truman McNeil2
1Center for Cancer Research, National Cancer Institute/NIH, Bethesda, MD 20892, USA.
Molecular cell
|January 14, 2025
概括
由于表观遗传变化,衰老细胞会失去像CENP-A这样的中心蛋白质. 抑制p53和LSD1/KDM1A通过恢复中心膜功能,使这些细胞复苏.
科学领域:
- 细胞衰老 细胞衰老
- 表观遗传学 在表观遗传学中,表观遗传学是指表观遗传学.
- 分子生物学分子生物学
背景情况:
- 衰老的特点是遗传,表观遗传和生理变化.
- 衰老的细胞表现出异性染色素的损失和降低的基因素水平.
- 中心体完整性对于基因组稳定性至关重要.
研究的目的:
- 为了研究老细胞中中间体的命运.
- 在衰老过程中识别调节中心体功能的机制.
- 探索老化细胞的线粒细胞复原的策略.
主要方法:
- 在老年人纤维细胞,组织和衰老模型中跟踪中心分子动力学.
- 分析CENP-A水平和中心体转录.
- 研究p53和氨酸特异性脱甲基酶1 (LSD1/KDM1A) 的作用.
- 使用p53和LSD1/KDM1A.A.的双重抑制.
主要成果:
- 在老化的细胞中,CENP-A以p53依赖的方式下调.
- 中心非编码转录的表观遗传抑制通过LSD1/KDM1A招募发生.
- 这种压抑会对衰老的中间体产生新的CENP-A负载.
- 双重抑制p53和LSD1/KDM1A恢复了中心蛋白和转录,导致了线粒细胞的再生.
结论:
- 衰老涉及p53依赖的CENP-A下调和中心转录的表观遗传沉默.
- 在老化过程中,LSD1/KDM1A在中心体无活化中起着关键作用.
- 针对p53和LSD1/KDM1A提供了与年龄相关的细胞功能障碍的治疗策略.
相关概念视频
Replicative Cell Senescence
3.6K
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...
3.6K
Histone Variants at the Centromere
4.3K
Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3...
4.3K
Meiosis I
38.0K
Meiosis is the division of a diploid cell into haploid cells forming sperm and eggs in animals through differentiation. Meiosis I is the first stage of meiosis, where the genetic recombination of homologous chromosomes and the reduction of the ploidy level by half occurs.
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
Prophase I is the most extended and complex step of meiosis I characterized by synapsis, chromosome pairing, and recombination of the homologous chromosomes. This process is facilitated by a proteinaceous structure called the...
38.0K
Replication in Eukaryotes
13.0K
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
13.0K
Meiosis II
43.0K
Meiosis II entails cell division and segregation of the sister chromatids, resulting in the production of four unique haploid gametes. The steps for meiosis II are similar to mitosis, except that meiosis II occurs in haploid cells, whereas mitosis occurs in diploid cells.
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
The timing and cell division patterns of meiosis differ between males and females. In male meiosis, the centrosomes are part of the formation of the meiotic spindle. However, in oocytes, including that of humans, Drosophila,...
43.0K
DNA Damage can Stall the Cell Cycle
9.0K
In response to DNA damage, cells can pause the cell cycle to assess and repair the breaks. However, the cell must check the DNA at certain critical stages during the cell cycle. If the cell cycle pauses before DNA replication, the cells will contain twice the amount of DNA. On the other hand, if cells arrest after DNA replication but before mitosis, they will contain four times the normal amount of DNA. With a host of specialized proteins at their disposal,cells must use the right protein at...
9.0K


