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Related Concept Videos

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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Long-term depression, or LTD, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTD is the process of synaptic weakening that occurs over time between pre and postsynaptic neuronal connections. The synaptic weakening of LTD works in opposition to synaptic strengthening by long-term potentiation (LTP) and together are the main mechanisms that underlie learning and memory.
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Long-term Potentiation01:35

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre- and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Long-term Potentiation01:25

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Long-term potentiation, or LTP, is one of the ways by which synaptic plasticity—changes in the strength of chemical synapses—can occur in the brain. LTP is the process of synaptic strengthening that occurs over time between pre and postsynaptic neuronal connections. The synaptic strengthening of LTP works in opposition to the synaptic weakening of long-term depression (LTD) and together are the main mechanisms that underlie learning and memory.
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Related Experiment Video

Updated: Jan 11, 2026

3D Modeling of Dendritic Spines with Synaptic Plasticity
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Localization of Fascin to Dendritic Protrusions Regulates Postsynaptic Plasticity.

James Q Zheng, Shuristeen Joubert, Carlos Gonzalez-Islas

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    Summary

    Fascin, an actin-bundling protein, is found in neuronal dendrites and spines, regulating synaptic plasticity. Its role in dendritic compartments was previously overlooked, but it

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    Area of Science:

    • Neuroscience
    • Cell Biology
    • Molecular Biology

    Background:

    • Fascin is an actin-bundling protein crucial for membrane protrusions.
    • Previous research suggested fascin was absent from neuronal dendritic filopodia and spines.

    Purpose of the Study:

    • To investigate the presence and function of fascin in dendritic compartments of neurons.
    • To determine fascin's role in dendritic filopodia, spines, and synaptic plasticity.

    Main Methods:

    • Optimized immunocytochemistry and CRISPR-based endogenous tagging of fascin1 in cultured hippocampal neurons.
    • Super-resolution imaging to visualize fascin organization within dendritic spines.
    • CRISPR-mediated knockout of fascin1 to assess its impact on synaptic function.

    Main Results:

    • Fascin1 localizes to developing dendritic filopodia and is enriched in mature dendritic spines.
    • Fascin1 forms nanoscale foci within dendritic spine heads.
    • Knockout of fascin1 impairs synaptic potentiation but not baseline synaptic transmission.

    Conclusions:

    • Fascin is present and functionally important in dendritic compartments, challenging previous assumptions.
    • Fascin plays a critical role in regulating postsynaptic plasticity by organizing actin within dendritic spines.
    • This study reveals a novel function of fascin in neuronal structure and plasticity.