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相关概念视频

Cell Migration01:09

Cell Migration

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Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
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Cell Migration01:19

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Cell migration is a process by which the cells move from one location to another, playing an essential role in embryological development, repair and regeneration, immune response, and metastasis. Cells migrate in response to chemical or mechanical signals generated by specific organs or tissues. The overall mechanism includes three steps - polarization, protrusion, and release. Polarization involves the formation of a distinct cell front and rear, which determines the direction of movement.
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Mechanism of Lamellipodia Formation01:31

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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...
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Cell Motility through Blebbing01:16

Cell Motility through Blebbing

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Blebs are a type of membrane protrusion formed by the internal hydrostatic pressure of the cytoplasm. Blebs are observed in several cell types, including fibroblasts, immune cells, and single-celled organisms like the amoeba. The primary function of blebs is cell locomotion and apoptosis, but they are also found during necrosis and cell division. The life cycle of a bleb comprises an initiation phase followed by the expansion and retraction phases.
Blebbing Through the Matrix
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Activation of Integrins01:15

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Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling."
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Intracellular Signaling Affects Focal Adhesions01:17

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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.
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相关实验视频

Updated: Apr 30, 2026

A Flow Adhesion Assay to Study Leucocyte Recruitment to Human Hepatic Sinusoidal Endothelium Under Conditions of Shear Stress
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阿尔法4整合素介导淋巴细胞的附着和在生理流动下滚动.

C Berlin1, R F Bargatze, J J Campbell

  • 1Department of Pathology, Stanford University, California 94305.

Cell
|February 10, 1995
PubMed
概括

阿尔法4 (CD49d) 整合素在剪切流下启动淋巴细胞粘附,独立于选择素. 这些整合素与β2整合素不同,对于白细胞的初始相互作用和附着是至关重要的.

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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
  • 生物物理学的生物物理.

背景情况:

  • 白细胞-内皮细胞相互作用对免疫反应至关重要.
  • 选择素启动白细胞在生理剪切下滚动,先于整合素介导的停止.
  • 贝塔2 (CD18) 整合素需要选择因参与中性粒细胞粘附.

研究的目的:

  • 研究α4 (CD49d) 整合素在剪切流下启动白细胞粘附中的作用.
  • 为了确定alpha 4整合素是否可以独立于selectins调节粘附.
  • 阐明α4整合素介导粘附的机制,包括连接体相互作用和地形呈现.

主要方法:

  • 在体外剪切流量测试以评估淋巴细胞结合和滚动.
  • 临床研究的淋巴细胞附着在自己的膜静脉.
  • 扫描电子显微镜可视化淋巴细胞上的整蛋白分布.

主要成果:

  • 阿尔法4 (CD49d) 整合素在剪切下启动淋巴细胞结合,没有选择性参与.
  • 阿尔法4整合素连接体 (MAdCAM-1,VCAM-1) 支持滚动和取决于激活的停止.
  • 阿尔法4β7在体内调解L-选择因独立的淋巴细胞粘附.
  • 阿尔法4β7集中在微型菌上,便于初始接触,而β2整合素被排除在外.

结论:

  • 阿尔法4整合素,但不是β2整合素,可以在流动条件下启动白细胞粘附.
  • 微上α4整合素的地形呈现有助于它们在启动粘附方面的作用.
  • 这些发现揭示了由α4整合素介导的淋巴细胞粘附启动的独特机制.