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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.
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Purification and Analysis of Caenorhabditis elegans Extracellular Vesicles
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Secreted exosomes induce filopodia formation.

Caitlin McAtee1,2, Mikin R Patel3, Daisuke Hoshino4

  • 1Department of Cell and Developmental Biology, Vanderbilt University School of Medicine, Nashville, United States.

Elife
|January 14, 2026
PubMed
Summary
This summary is machine-generated.

Secreted exosomes, specifically small extracellular vesicles (SEVs), drive filopodia formation. These SEVs carry Thrombospondin Type 1 Domain Containing 7A (THSD7A), which activates Cdc42 to promote filopodia in cancer cells and neurons.

Keywords:
EndoglinTHSD7Acell biologycell migrationchickenextracellular vesiclesfilopodiahumanmouseratsynapse formation

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Area of Science:

  • Cell Biology
  • Extracellular Vesicles
  • Cytoskeletal Dynamics

Background:

  • Filopodia are crucial for cell sensing, adhesion, migration, and neuronal synapse formation.
  • Actin cytoskeleton dynamics are key to filopodia, but upstream extracellular signals remain unclear.

Purpose of the Study:

  • To identify extracellular regulators of filopodia formation.
  • To elucidate the role of exosomes in filopodia biogenesis and function.

Main Methods:

  • Inhibition of exosome secretion and rescue experiments with extracellular vesicles (EVs).
  • Proteomic analysis of small EVs (SEVs) from cancer cells and neurons.
  • Functional assays assessing filopodia formation, cancer cell metastasis, and neuronal synapse formation.

Main Results:

  • Exosome secretion inhibition impaired filopodia formation and stabilization in cancer cells and neurons.
  • Small EVs (SEVs) demonstrated potent filopodia-inducing activity.
  • SEVs carry endoglin and Thrombospondin Type 1 Domain Containing 7A (THSD7A), with THSD7A rescuing filopodia defects and activating Cdc42.

Conclusions:

  • Secreted exosomes, particularly SEVs carrying THSD7A, are potent inducers of filopodia formation.
  • THSD7A acts via Cdc42 activation to promote filopodia in both cancer cells and neurons.
  • This identifies a novel exosome-mediated pathway for regulating filopodia and associated cellular functions.