一个非正规的cGAS-STING通路驱动细胞和生物的衰老
Rafael Cancado de Faria1, Lilian N D Silva1, Barbara Teodoro-Castro1
1Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine, St. Louis, MO 63104.
概括
衰老细胞表现出激活常规循环-GMP-AMP合成酶 (cGAS) -干扰素基因刺激器 (STING) 途径的能力降低. 相反,一个非正规的途径被触发,驱动衰老的表型和炎症.
科学领域:
- 细胞生物学 细胞生物学
- 免疫学 免疫学 免疫学
- 衰老研究研究 衰老研究
背景情况:
- 细胞质DNA积累是衰老的标志,通过cGAS-STING通路触发无菌炎症.
- 将cGAS-STING途径与衰老联系在一起的精确分子机制仍然不清楚.
研究的目的:
- 阐明细胞衰老和孕症中cGAS-STING通路的分子机制.
- 为了确定与年龄相关的炎症状况的治疗点.
主要方法:
- 在老年,衰老和孕病纤维细胞中对STING激活的分析.
- 与cGAS-STING活动相关的炎症程序 (SASP,干扰素反应) 的评估.
- 对调节cGAS-STING通路的维生素D受体信号的研究.
- 在活体研究中使用孕病小鼠模型.
主要成果:
- 衰老,衰老和孕病细胞表现出非正规的STING局部化和受损的正规通路激活,尽管细胞质DNA积累.
- 一个cGAS-STING-依赖的非正规途径驱动衰老的表型和炎症.
- 维生素D受体信号传递可以拯救衰老细胞中受损的正规cGAS-STING激活.
- 抑制非正规途径改善了衰老的特征,减少了退化,并延长了前列腺症小鼠的寿命.
结论:
- 衰老的特点是激活规范cGAS-STING通路的能力下降,导致补偿性非规范通路,促进衰老和衰老.
- 针对这种非正统的途径,为与年龄有关的疾病提供了一个有前途的治疗策略.
相关概念视频
Aging
191
Aging is a complex biological phenomenon influenced by various processes that affect cellular and systemic functions. Several prominent theories attempt to explain its mechanisms, highlighting cellular limitations, oxidative damage, and hormonal changes as central factors in aging.
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
Cellular Clock Theory
The cellular clock theory posits that the human lifespan is closely tied to the finite capacity of cells to divide, a phenomenon governed by telomeres, which are protective caps at the ends of...
191
Mitochondria
15.1K
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,...
15.1K
The Effect of Aging on Tissues
2.6K
Several body functions deteriorate with age. The external signs of aging are easily identifiable. For example, the skin becomes dry, less elastic, and thins out, forming wrinkles. The skin of the face begins to appear looser due to a decrease in the levels of elastic and collagen fibers in the connective tissue. Additionally, melanin production in the hair follicle decreases with age, resulting in gray hair. Moreover, the senses of sight and hearing decline, so glasses and hearing aids may...
2.6K
Intracellular Signaling Cascades
47.9K
Once a ligand binds to a receptor, the signal is transmitted through the membrane and into the cytoplasm. The continuation of a signal in this manner is called signal transduction. Signal transduction only occurs with cell-surface receptors, which cannot interact with most components of the cell, such as DNA. Only internal receptors can interact directly with DNA in the nucleus to initiate protein synthesis. When a ligand binds to its receptor, conformational changes occur that affect the...
47.9K
Replicative Cell Senescence
3.7K
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...
3.7K
Mitogens and the Cell Cycle
6.9K
Mitogens and their receptors play a crucial role in controlling the progression of the cell cycle. However, the loss of mitogenic control over cell division leads to tumor formation. Therefore, mitogens and mitogen receptors play an important role in cancer research. For instance, the epidermal growth factor (EGF) - a type of mitogen and its transmembrane receptor (EGFR), decides the fate of the cell's proliferation. When EGF binds to EGFR, a member of the ErbB family of tyrosine kinase...
6.9K


