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Related Experiment Videos

ADP-ribosylation factor 6 regulates actin cytoskeleton remodeling in coordination with Rac1 and RhoA.

R L Boshans1, S Szanto, L van Aelst

  • 1Department of Biological Sciences, University of Notre Dame, Notre Dame, Indiana 46556-0369, USA.

Molecular and Cellular Biology
|April 25, 2000
PubMed
Summary

ADP-ribosylation factor 6 (ARF6) is crucial for cell surface remodeling and stress fiber regulation. Bombesin activates ARF6, influencing Rac1 and inhibiting RhoA for cytoskeletal control.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • ADP-ribosylation factor 6 (ARF6) plays a role in cellular processes.
  • G-protein-coupled receptor (GPCR) signaling influences cytoskeletal dynamics.
  • Rac1 and RhoA are key regulators of the actin cytoskeleton.

Purpose of the Study:

  • To investigate the role of ARF6 in cell surface remodeling and stress fiber formation.
  • To elucidate the signaling pathway linking GPCR activation to ARF6 and downstream effectors.
  • To understand how ARF6 regulates the balance between Rac1 and RhoA activity.

Main Methods:

  • Stimulation of cells with bombesin (a GPCR agonist).
  • Expression of dominant-negative and constitutively active ARF6 mutants.

Related Experiment Videos

  • Analysis of vesicular trafficking and cytoskeletal organization using microscopy.
  • Investigation of G-protein signaling (Gq) and RhoA activation.

    • Main Results:

    • Bombesin triggers the redistribution of ARF6 and Rac1 to the cell surface, causing actin rearrangements.
    • ARF6 activation is dependent on Gq signaling and involves endosomal recycling.
    • Activated ARF6 inhibits stress fiber formation by downregulating RhoA activation.
    • ARF6 promotes Rac1 activation and inhibits RhoA activation, impacting cytoskeletal remodeling.

    Conclusions:

    • ARF6 is essential for cell surface remodeling and the downregulation of stress fibers.
    • Bombesin acts as a physiological trigger for ARF6 activation via Gq signaling.
    • ARF6 coordinates Rac1 and RhoA signaling pathways to regulate cytoskeletal dynamics.