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相关概念视频

Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

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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...
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Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

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The polymerization of G-actin monomers into filamentous F-actin is a multi-step process. Once the F-actins are formed, they can bundle together in different arrangements to form higher-order networks and regulate cellular functions. Common examples include the formation of lamellipodia and filopodia at the cell's leading edge by actin reorganization in a migrating cell. The microvilli on the brush border epithelial cells are also formed through the F-actin network.
The high-order actin...
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Intracellular Signaling Affects Focal Adhesions01:17

Intracellular Signaling Affects Focal Adhesions

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Integrins act both as extracellular input receivers and as intracellular processing activators. As their name suggests, integrins are entirely integrated into the membrane structure. Their hydrophobic membrane-spanning regions interact with the phospholipid bilayer's hydrophobic region. These membrane receptors provide extracellular attachment sites for effectors like hormones and growth factors. They activate intracellular response cascades when their effectors are bound and active.
Some...
2.6K
Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

5.1K
Actin is a family of globular proteins that are highly abundant in eukaryotic cells. It makes up approximately 1-5% of total cell protein concentration. Actin monomers polymerize to form a complex network of polarized filaments, the actin cytoskeleton, that plays a crucial role in many cellular processes, including cell motility, division, endocytosis, and metastasis of cancer cells.
Actin cytoskeleton dynamics can produce pushing, pulling, and resistance forces that help the cell to migrate....
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The Role of Actin and Myosin in Non-muscle Cells01:10

The Role of Actin and Myosin in Non-muscle Cells

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Actin and myosin or actomyosin filaments also play a significant role in cells other than those involved in muscle contraction (which occurs within the sarcomere of muscle cells). The mechanism of non-muscle cell contractile bundles was first observed in Dictyostelium and Acanthamoeba. In non-muscle cells, two bundles are commonly found: stress fibers and actomyosin adherence belts. These contractile bundles are smaller and less organized than the ones found in muscle cells. They  are held...
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Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
Arp2/3 Complex
Arp2/3 complex is a seven-subunit complex consisting of two proteins similar to actin- Arp2 and Arp3, and five other subunits that help keep Arp2 and Arp3 inactive. When required, the complex is...
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相关实验视频

Updated: Jun 5, 2025

Visualizing the Actin and Microtubule Cytoskeletons at the B-cell Immune Synapse Using Stimulated Emission Depletion STED Microscopy
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Visualizing the Actin and Microtubule Cytoskeletons at the B-cell Immune Synapse Using Stimulated Emission Depletion STED Microscopy

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通过结合actin,PAG可以调节T细胞免疫突触的功能.

Emily K Moore, Marianne Strazza, Xizi Hu

    bioRxiv : the preprint server for biology
    |December 16, 2024
    PubMed
    概括

    适应蛋白质"与糖脂丰富微域1 (PAG) 相关的脂蛋白" (Phosphoprotein Associated with Glycosphingolipid Rich Microdomains 1) 与行为细胞骨相连. 这种PAG-actin相互作用对于T细胞突触形成和细胞毒性功能至关重要,为免疫治疗提供了一个新的点.

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    Visualizing the Actin and Microtubule Cytoskeletons at the B-cell Immune Synapse Using Stimulated Emission Depletion STED Microscopy
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    科学领域:

    • 免疫学 免疫学 免疫学
    • 细胞生物学 细胞生物学
    • 生物化学 生物化学

    背景情况:

    • 针对T细胞功能的免疫疗法至关重要,但其成功率可变,并可能导致不良事件.
    • 免疫突触是T细胞激活和功能的一个关键部位.
    • 与甘氨基脂丰富微域1 (PAG) 相关的蛋白是一种参与T细胞信号传递和膜组织的支架蛋白.

    研究的目的:

    • 研究PAG-actin相互作用在T细胞突触组织和功能中的作用.
    • 为了确定PAG-actin动态是否在T细胞突触成熟过程中得到协调.
    • 评估破坏PAG-actin链接对免疫反应的体内影响.

    主要方法:

    • 研究了T细胞突触形成过程中PAG和actin动态之间的协调.
    • 利用PAG中的PDZ域突变来破坏其与actin细胞骨的相互作用.
    • 在试验室中评估T细胞突触的稳定性和功能.
    • 使用IV型过敏和OVA瘤的小鼠模型来评估体内免疫反应.

    主要成果:

    • 在T细胞突触成熟过程中,PAG和actin动力学是紧密协调的.
    • 通过PDZ突变破坏PAG-actin相互作用显著损害T细胞突触形成,稳定性和功能.
    • 具有表达PDZ突变PAG的T细胞的小鼠在体内表现出免疫反应减弱和细胞毒性功能受损.

    结论:

    • PAG-actin链接对于有效的T细胞免疫突触形成和功能至关重要.
    • 针对PAG-actin相互作用是调节免疫反应和治疗免疫相关疾病的有希望的策略.