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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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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.
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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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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.
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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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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.
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Related Experiment Video

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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PAG orchestrates T cell immune synapse function by binding to actin.

Emily K Moore, Marianne Strazza, Xizi Hu

    Biorxiv : the Preprint Server for Biology
    |December 16, 2024
    PubMed
    Summary
    This summary is machine-generated.

    The adaptor protein Phosphoprotein Associated with Glycosphingolipid Rich Microdomains 1 (PAG) links to the actin cytoskeleton. This PAG-actin interaction is crucial for T cell synapse formation and cytotoxic function, offering a new target for immunotherapy.

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    Real-time Live Imaging of T-cell Signaling Complex Formation
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    Area of Science:

    • Immunology
    • Cell Biology
    • Biochemistry

    Background:

    • Immunotherapies targeting T cell function are vital but have variable success rates and can cause adverse events.
    • The immune synapse is a key site for T cell activation and function.
    • Phosphoprotein Associated with Glycosphingolipid Rich Microdomains 1 (PAG) is a scaffold protein involved in T cell signaling and membrane organization.

    Purpose of the Study:

    • To investigate the role of the PAG-actin interaction in T cell synapse organization and function.
    • To determine if PAG-actin dynamics are coordinated during T cell synapse maturation.
    • To evaluate the in vivo impact of disrupting the PAG-actin link on immune responses.

    Main Methods:

    • Investigated the coordination between PAG and actin dynamics during T cell synapse formation.
    • Utilized a PDZ domain mutation in PAG to disrupt its interaction with the actin cytoskeleton.
    • Assessed T cell synapse stability and function in vitro.
    • Employed mouse models of type IV hypersensitivity and OVA-tumor to evaluate in vivo immune responses.

    Main Results:

    • PAG and actin dynamics are tightly coordinated during T cell synapse maturation.
    • Disruption of the PAG-actin interaction via a PDZ mutation significantly impaired T cell synapse formation, stability, and function.
    • Mice with T cells expressing PDZ-mutant PAG exhibited diminished immune responses and impaired cytotoxic function in vivo.

    Conclusions:

    • The PAG-actin link is essential for effective T cell immune synapse formation and function.
    • Targeting the PAG-actin interaction represents a promising strategy for modulating immune responses and treating immune-related diseases.