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Related Experiment Videos

VEGF treatment induces signaling pathways that regulate both actin polymerization and depolymerization.

Chunhong Gong1, Konstantin V Stoletov, Bruce I Terman

  • 1Cardiology Division, Department of Medicine, Albert Einstein College of Medicine, Bronx, New York, USA.

Angiogenesis
|May 12, 2005
PubMed
Summary
This summary is machine-generated.

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Vascular endothelial growth factor (VEGF) drives cell migration by reorganizing actin. This study reveals VEGF controls actin polymerization via N-WASP and Nck, and depolymerization through cofilin and LIM-kinase, regulated by PI3-K and ROCK.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Vascular endothelial growth factor (VEGF) is crucial for angiogenesis and endothelial cell migration.
  • Actin cytoskeleton reorganization is vital for cell migration but the underlying signaling pathways for VEGF-induced changes are not fully understood.
  • VEGF influences multiple signaling pathways to regulate cell behavior.

Purpose of the Study:

  • To elucidate the signaling pathways mediating actin reorganization in response to VEGF.
  • To investigate the roles of N-WASP, Nck, cofilin, LIM-kinase, PAK, PI3-K, and ROCK in VEGF-induced actin dynamics.
  • To understand the mechanisms of actin polymerization and depolymerization during VEGF-stimulated endothelial cell migration.

Main Methods:

  • Dominant-negative protein expression to block specific signaling molecules.

Related Experiment Videos

  • Cellular redistribution assays to track protein localization.
  • Western blotting to detect protein phosphorylation.
  • Pharmacological inhibition of key signaling enzymes (PI3-K, ROCK).

    • Main Results:

    • VEGF treatment promotes redistribution of N-WASP to the cell surface, dependent on Nck.
    • Nck plays a role in actin stress fiber formation.
    • VEGF induces rapid phosphorylation of cofilin and LIM-kinase.
    • PAK does not mediate VEGF-induced LIM-kinase phosphorylation or actin reorganization.
    • PI3-K and ROCK signaling pathways are involved in regulating LIM-kinase activity.

    Conclusions:

    • VEGF regulates both actin polymerization and depolymerization through distinct signaling pathways.
    • Nck and N-WASP are key mediators of VEGF-induced actin polymerization and stress fiber formation.
    • VEGF-induced actin depolymerization involves cofilin and LIM-kinase, with PI3-K and ROCK playing regulatory roles.
    • The PAK pathway is not involved in VEGF-induced actin reorganization in this context.