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Updated: Aug 13, 2025

In Vitro Polymerization of F-actin on Early Endosomes
Published on: August 28, 2017
Vesicle-Associated Actin Assembly by Formins Promotes TGFβ-Induced ANGPTL4 Trafficking, Secretion and Cell Invasion
Dennis Frank1, Christel Jessica Moussi1,2, Svenja Ulferts1
1Institute of Experimental and Clinical Pharmacology and Toxicology, Medical Faculty, University of Freiburg, 79104, Freiburg, Germany.
Formin-like 2 (FMNL2) controls cancer cell invasion by regulating Angiopoietin-like 4 (ANGPTL4) secretion. This protein is essential for ANGPTL4 vesicle trafficking and actin polymerization, impacting tumor progression.
Area of Science:
- Cell Biology
- Molecular Oncology
- Cancer Research
Background:
- Vesicle trafficking is crucial for tumor progression.
- Transforming growth factor beta (TGFβ)-mediated Angiopoietin-like 4 (ANGPTL4) secretion promotes cancer development.
Purpose of the Study:
- To investigate the role of Formin-like 2 (FMNL2) in ANGPTL4 trafficking and secretion.
- To elucidate the mechanism by which FMNL2 regulates cancer cell invasion and metastasis.
Main Methods:
- Utilized super-resolution microscopy to visualize vesicle trafficking.
- Investigated protein kinase C (PKC)-dependent phosphorylation of FMNL2.
- Analyzed the association of FMNL2 with actin, Rab8a, and myosin Vb.
Main Results:
- FMNL2 is essential for TGFβ-induced ANGPTL4 trafficking and secretion.
- PKC-dependent phosphorylation of FMNL2 is required for cancer cell invasion and ANGPTL4 secretion.
- FMNL2 directly polymerizes actin at ANGPTL4-containing vesicles, facilitating their movement.
Conclusions:
- FMNL2 controls ANGPTL4 vesicle trafficking and secretion through actin polymerization.
- This FMNL2-mediated mechanism is critical for cancer cell invasion and metastasis.
- Targeting this pathway may offer new strategies for cancer treatment.
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