素乙化增强了在机械应力下椎网状细胞中的微管稳定性
Chien-Chia Su1,2, Vaibhav Desikan1, Kevin Betsch1
1Department of Ophthalmology, Duke Eye Center, Duke University, Durham, North Carolina, United States.
Investigative ophthalmology & visual science
|January 17, 2025
概括
循环机械拉伸增加了状网状细胞中的管氨酸乙化,这是青光眼的关键因素. 抑制HDAC6降低眼内压力,这表明素乙化作为潜在的青光瘤治疗方法.
科学领域:
- 眼科医生 眼科 眼科
- 细胞生物学 细胞生物学
- 生物化学 生物化学
背景情况:
- 脊椎网状 (TM) 细胞对于通过眼睛的外流通道调节眼内压力 (IOP) 是至关重要的.
- 素乙化是一种翻译后的修饰,影响微管稳定性和细胞功能.
- 了解TM细胞对机械应激的反应,对于玻璃眼研究至关重要.
研究的目的:
- 在循环机械拉伸 (CMS) 下研究TM细胞中素乙化作用.
- 确定氨酸乙化对流出途径生理学和病理学的影响.
- 探索氨酸乙化作为一种潜在的治疗眼的目标.
主要方法:
- 人类TM细胞接受了CMS,并测量了乙化α-tubulin (Ac-TUBA4) 的水平.
- 调节氨酸乙化的酶 (ATAT1,HDAC6,SIRT2) 通过siRNA进行了分析.
- 在眼和非眼TM细胞和组织之间比较了Ac-TUBA4水平.
- 评估了微管稳定性和细胞收缩性.
- 在小鼠内腔内注射图巴后,对IOP的体内影响进行了评估.
主要成果:
- 在TM细胞中,CMS通过降低HDAC6.6的调节来上调调节素乙化.
- 在眼性TM细胞和组织中发现了升高的Ac-TUBA4水平.
- 素乙化增强了微管的稳定性,防止因诺可达引起的脱聚合.
- 在小鼠中,室内注射图巴 (HDAC6抑制剂) 显著降低了IOP.
结论:
- 素乙化在TM细胞对机械应激反应中起着至关重要的作用.
- 这种乙化影响IOP调节,可能与青光眼病原发生有关.
- 向氨酸乙化,特别是通过HDAC6抑制,显示了降低青光眼中IOP的治疗潜力.
更多相关视频
07:54Purification of Tubulin with Controlled Posttranslational Modifications and Isotypes from Limited Sources by Polymerization-Depolymerization Cycles
Published on: November 5, 2020
5.1K
09:20Live Cell Response to Mechanical Stimulation Studied by Integrated Optical and Atomic Force Microscopy
Published on: October 4, 2010
11.3K
相关概念视频
Microtubule Instability
5.0K
Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated...
5.0K
Destabilization of Microtubules
2.6K
The destabilization of microtubules can occur during different stages of the microtubule lifecycle, such as nucleation or elongation. It can take place at either end of the microtubule or in the microtubule lattices as a whole. The lifespan of individual microtubules within a cell varies according to the cell type and stage of the cell cycle. During interphase, the lifespan of the microtubule is about 30 minutes, while during cell division, it is about 15 minutes. In axonal microtubules of...
2.6K
Microtubule Formation
5.5K
Microtubules are dynamic structures that undergo continuous assembly and disassembly. They originate from specialized multi-protein complexes known as microtubule organizing centers or MTOCs. Within the MTOC, the point of origin of the microtubule is known as the minus end, while the end radiating outward is the plus end. Microtubules serve two primary functions — the organization of spindle complexes to separate sister chromatids during mitotic or meiotic cell division and the formation...
5.5K
Microtubules
7.1K
Microtubules are the thickest cytoskeletal filaments with a diameter of 25 nm. In prokaryotic organisms, microtubules are commonly found in locomotory appendages like cilia and flagella. In eukaryotic cells, microtubules form specialized extensions for moving fluid over the surface, like those found in cells lining the intestine.
Microtubules have two structurally similar globular protein subunits: α and β tubulins. In the cytosol, the α and β tubulins form a heterodimer....
Microtubules have two structurally similar globular protein subunits: α and β tubulins. In the cytosol, the α and β tubulins form a heterodimer....
7.1K
Assembly of Complex Microtubule Structures
1.8K
Complex microtubule structures are present in resting cells and in dividing cells. In resting cells, they are responsible for maintaining the cellular architecture, tracks for intracellular transport, positioning of organelles, assembly of cilia and flagella. They mediate the bipolar spindle assembly for chromosomal segregation and positioning of the cell division plate in dividing cells. The formation of microtubule complex structures depends on the cell type, cell stage, and cell function.
1.8K
Drugs that Stabilize Microtubules
2.0K
Microtubules are dynamic structures that undergo cycles of catastrophe and rescue. The microtubules play a central role in cell division by forming the spindle apparatus for segregating the chromosomes. This makes them ideal targets for regulating dividing cells in tumors and malignant cancer cells. Microtubule stabilizing drugs help stabilize the microtubule formation and promote its polymerization. Paclitaxel was the first microtubule stabilizing agent used as anticancer drug in chemotherapy...
2.0K
