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Related Concept Videos

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.
Some...
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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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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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Cell Migration01:09

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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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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.
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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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Related Experiment Video

Updated: Jul 30, 2025

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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LFA-1 Activation in T-Cell Migration and Immunological Synapse Formation.

Huiping Shi1,2, Bojing Shao1

  • 1Cardiovascular Biology Research Program, Oklahoma Medical Research Foundation, Oklahoma City, OK 73104, USA.

Cells
|May 16, 2023
PubMed
Summary

This review explores the intermediate-affinity state of Integrin LFA-1 (Leukocyte Function-associated Antigen 1) in T-cell migration and immune synapse formation. It highlights the need for further research into its activation and function.

Keywords:
LFA-1T-cell migrationimmunological synapse

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Related Experiment Videos

Last Updated: Jul 30, 2025

Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Qualitative and Quantitative Analysis of the Immune Synapse in the Human System Using Imaging Flow Cytometry
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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Integrin LFA-1 (Leukocyte Function-associated Antigen 1) is crucial for T-cell migration and immunological synapse formation.
  • LFA-1 interacts with ligands at low, intermediate, and high affinities, with prior research focusing mainly on the high-affinity state.
  • The activation signaling and functional roles of LFA-1 in its intermediate-affinity state remain largely uncharacterized.

Purpose of the Study:

  • To review the activation mechanisms of LFA-1 to its intermediate-affinity state.
  • To summarize the known roles of LFA-1 in its intermediate-affinity state concerning T-cell functions.
  • To highlight knowledge gaps regarding LFA-1 intermediate-affinity signaling and function.

Main Methods:

  • Literature review of existing research on Integrin LFA-1.
  • Analysis of studies investigating T-cell migration and immunological synapse formation.
  • Synthesis of data on LFA-1 ligand-binding affinities and their regulatory roles.

Main Results:

  • Prior research predominantly investigated LFA-1 in the high-affinity state.
  • LFA-1 exists in an intermediate-affinity state on T cells, but its activation pathways are poorly understood.
  • The specific functions mediated by LFA-1 in its intermediate-affinity state are not well-defined.

Conclusions:

  • Further investigation is required to elucidate the signaling pathways that activate LFA-1 to its intermediate-affinity state.
  • Understanding the role of intermediate-affinity LFA-1 is critical for comprehending T-cell migration and immune synapse dynamics.
  • This review underscores the importance of exploring LFA-1's varied affinities for a complete picture of T-cell regulation.