相关实验视频
Updated: Jun 14, 2025
10:30
Isolation of Mouse Megakaryocyte Progenitors
Published on: May 20, 2021
6.5K
线性受体体表现出较低的Cdc42活性,用于由巨核细胞延长血小板
Adrien Antkowiak1, Julie Batut2, Frédérique Gaits-Iacovoni2
1Univ. Grenoble Alpes, Inserm, U1216, Grenoble Institut Neurosciences, 38000, Grenoble, France.
Biochemical and biophysical research communications
|September 6, 2024
概括
大核细胞 (MKs) 使用线性基底体延伸血小板 (PPT) 沿着原纤维释放血小板. 意想不到的是,对于PPT延伸而言,Cdc42活性不需要在这些基因组中,这表明它起到了支架的作用.
科学领域:
- 血液学 血液学 血液学
- 细胞生物学 细胞生物学
- 生物物理学的生物物理.
背景情况:
- 血小板对于静血是必不可少的,由骨髓中的巨核细胞 (MKs) 生产.
- 血小板的产生涉及从MKs通过骨髓的鼻状体延伸血小板 (PPT).
- 体,特别是与原I纤维相互作用的线性体,调节PPT延伸和血小板释放.
研究的目的:
- 为了研究Cdc42小GTPase在线性基因组的功能中的作用,在巨核细胞的血小板扩展期间.
- 阐明巨核细胞与原I纤维相互作用以释放血小板的机制.
主要方法:
- 使用Förster共振能量转移 (FRET) 分析来测量Cdc42活动.
- 研究了巨核细胞,原I纤维和线性体之间的相互作用.
- 研究了Cdc42在分界膜系统 (DMS) 成熟中的作用.
主要成果:
- 巨核细胞线性体表现出机械拉动活动,但缺乏ECM消化能力.
- Cdc42的活性对于分界膜系统 (DMS) 的依赖于actomyosin的成熟至关重要.
- 虽然Cdc42存在于线性体中,但其活性是不可检测的,这表明在PPT延伸沿着原蛋白的过程中具有非催化支架功能.
结论:
- 在PPT机械延伸中,线性Podosomes充当了原I纤维和DMS膜之间的接触点.
- Cdc42可能在线性体中充当支架蛋白,用于PPT形成和沿着原纤维延长.
- 血小板释放与PPT延伸有机械联系,PPT延伸由线性体介导,独立于这些结构中的Cdc42活性.
相关概念视频
01:18Structure and Function of Platelets
1.1K
The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000...
1.1K
01:39Mechanism of Filopodia Formation
2.3K
Filopodia are thin, actin-rich cellular protrusions that play an important role in many fundamental cellular functions. They vary in their occurrence, length, and positioning in different cell types, suggesting their diverse roles.
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
Their main function is to guide migrating cells during normal tissue morphogenesis or cancer metastasis by recognizing and making initial contacts with the extracellular matrix. However, they can also act as stationary cell anchors or help to establish communication...
2.3K
01:31Mechanism of Lamellipodia Formation
2.5K
Cells migrating in response to external stimuli form lamellipodia, which are thin membrane protrusions supported by a mesh of linked, branched, or unbranched actin filaments. These actin filaments interact with myosin motor proteins, creating the dynamic actomyosin complex within the cytoskeleton. Contractility, or the ability to generate contractile stress, is inherent to the actomyosin complex. It helps cells detect the stiffness of the surrounding ECM and exert contractile force for...
2.5K
00:50Anaphase Promoting Complex
2.8K
The stepwise destruction of specific proteins is necessary for the progression and completion of the cell cycle. Such proteins are ubiquitinated by ubiquitin ligases and then subsequently destroyed by the proteasome. The SCF (Skp1/Cullin/F-box) and the anaphase-promoting complex (APC) are two important ubiquitin ligases involved in cell cycle progression. While SCF is active throughout the cell cycle, APC gets activated during metaphase to anaphase transition. Cdc20 or Cdh1 binds to APC and...
2.8K
01:15Differentiation of Common Myeloid Progenitor Cells
3.2K
Common myeloid progenitors (CMPs) are oligopotent cells that can differentiate into granulocytes and macrophages. Granulocytes and macrophages are essential for protecting the body against bacterial, viral, or fungal infections. They migrate from the bone marrow into the circulating blood to reach specific tissue sites where they differentiate and help in immune surveillance. However, they survive only for a few days and must be continuously made available to the organism to maintain a robust...
3.2K
02:17Separation of Sister Chromatids
3.6K
At the transition from prophase to metaphase, there is a reduction in cohesion along the chromosomal arms, resulting in the resolution of sister chromatids. However, residual cohesin connections remain to hold the sister chromatids together until the transition from metaphase to anaphase. The residual connection prevents any premature separation of sister chromatids, blocking the risks of aneuploidy within the daughter cells.
At the onset of anaphase, separase, a proteolytic enzyme, is...
At the onset of anaphase, separase, a proteolytic enzyme, is...
3.6K