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相关概念视频

Mechanism of Filopodia Formation01:39

Mechanism of Filopodia Formation

2.4K
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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Actin Polymerization and Cell Motility01:13

Actin Polymerization and Cell Motility

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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....
5.3K
Generation of Straight or Branched Actin Filaments01:14

Generation of Straight or Branched Actin Filaments

2.9K
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...
2.9K
Actin Polymerization01:42

Actin Polymerization

6.7K
Actin polymerization occurs through the head-to-tail association of binding sites on monomeric actin or G-actin to form filamentous or F-actin. The polymerization can be divided into three phases ̶  nucleation, elongation, and steady-state phase.
The nucleation phase involves forming a stable nucleus consisting of three actin monomers to form a new actin filament. Actin-binding proteins such as formins and Arp2/3 complex help filament growth post-nucleation. The Formins form straight...
6.7K
Adaptability of Cytoskeletal Filaments01:12

Adaptability of Cytoskeletal Filaments

3.8K
The cytoskeleton is a complex dynamic structure performing varied functions based on cellular requirements. The adaptability of the individual filaments in the cytoskeleton determines their ability to perform various functions within the cell. It can undergo rapid reorganization during processes like cell division or remain stable for several hours as in the interphase. The adaptability of these filaments depends on stringent regulatory mechanisms. The microfilament and microtubules of the...
3.8K
Formation of Higher-order Actin Filaments01:11

Formation of Higher-order Actin Filaments

3.0K
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...
3.0K

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相关实验视频

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Controlling Flow Speeds of Microtubule-Based 3D Active Fluids Using Temperature
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在动态驱动的活性纤维中出现的可编程行为和混乱.

Deepak Krishnamurthy1, Manu Prakash2

  • 1Department of Bioengineering, University of California, Berkeley, CA 94720.

Proceedings of the National Academy of Sciences of the United States of America
|July 5, 2023
PubMed
概括
此摘要是机器生成的。

科学家们模拟了Lacrymaria olor细胞中的活性丝,以了解编程力量如何产生细胞部运动. 这项研究揭示了简单的规则如何产生复杂的行为,如搜索和寻找.

关键词:
有活性物质的活性物质.生物物理学的生物物理学.细胞行为 细胞行为这是一个混乱的混乱.非线性动力学的非线性动态

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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Using Microfluidics and Fluorescence Microscopy to Study the Assembly Dynamics of Single Actin Filaments and Bundles
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Tuning the Contractility and Deformation Modes of Active Actin-Based Assemblies In Vitro: From Two-Dimensional Active Networks to Liquid Crystal Drops
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科学领域:

  • 生物物理学的生物物理.
  • 细胞动态 细胞动态
  • 活动物质物理学 活动物质物理学

背景情况:

  • 了解细胞下部件如何产生细胞行为是生物学和物理学的重大挑战.
  • 状的Lacrymaria olor表现出复杂的狩猎行为,使用苗条的状子.
  • 细胞为特定的行为编程活性丝结构的机制尚不清楚.

研究的目的:

  • 开发一个主动丝模型,将编程强迫与丝形状动力学联系起来.
  • 为了研究时间变化的活动模式和追随力如何影响细胞部行为.
  • 探索简单程序产生复杂行为的潜力,如定位和搜索.

主要方法:

  • 开发一种包含时间变化的活动和追随力约束的活性灯光模型.
  • 在确定性,时间变化的追随力下分析导线动态.
  • 识别非线性代地图,以预测长期的导线行为.
  • 在Lacrymaria olor生物程序的统计测量用于实验性比较.

主要成果:

  • 在时间变化的追随力下,活跃的细丝表现出复杂的周期性和非周期性动态.
  • 在生物学上可访问的参数空间中观察到过渡到混乱,解释了无周期性.
  • 确定了一个简单的非线性代地图,预测长期的线程行为.
  • 模型的预测与L. olor.生物程序的统计性质进行了比较.

结论:

  • 活体导线模型可以阐明程序化力量和新兴细胞行为之间的关系.
  • 随时变化的追随力可以产生丰富而复杂的动态,包括混乱的政权.
  • 简单的预测地图表明,可以为特定的细胞功能设计人工程序.
  • 该研究为比较理论模型与细胞行为的实验观测提供了一个框架.