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Related Experiment Videos

Plexin-B semaphorin receptors interact directly with active Rac and regulate the actin cytoskeleton by activating

M H Driessens1, H Hu, C D Nobes

  • 1MRC Laboratory for Molecular Cell Biology, Department of Biochemistry and Molecular Biology, University College London, London, WC1E 6BT, United Kingdom.

Current Biology : CB
|March 27, 2001
PubMed
Summary

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Semaphorins and plexins regulate cell movement by activating Rho GTPases. This study reveals plexin-B1 signaling to the cytoskeleton is Rac and Rho dependent, crucial for axon guidance.

Area of Science:

  • Cell Biology
  • Neuroscience
  • Biochemistry

Background:

  • Semaphorins and plexins are crucial for embryonic and adult tissue development.
  • In neurons, they guide axon growth through attractive and repulsive cues.
  • Rho family GTPases (Rho, Rac, Cdc42) regulate actin cytoskeleton dynamics, impacting cell migration and axon guidance.

Purpose of the Study:

  • To investigate the interaction between Rac and plexins.
  • To elucidate the role of plexin-B1 signaling in cytoskeletal regulation.
  • To understand the mechanisms underlying semaphorin and plexin functions in cell migration and axon guidance.

Main Methods:

  • Yeast two-hybrid screening to identify protein interactions.
  • In vitro interaction assays to confirm binding.

Related Experiment Videos

  • Fibroblast cell culture and stimulation to observe cytoskeletal changes.
  • Analysis of actin:myosin filament assembly and cell contraction.

    • Main Results:

    • Active, GTP-bound Rac directly interacts with the cytoplasmic domain of plexin-B.
    • Plexin-B1 clustering in fibroblasts induces cell contraction and actin:myosin filament assembly, indicating Rho activation.
    • These cytoskeletal changes are dependent on both Rac and Rho.
    • A plexin-B1 mutant lacking the Rac binding region still induced cytoskeletal changes, suggesting Rac interaction is not essential for Rho activation.

    Conclusions:

    • Plexin-B signaling to the cytoskeleton is a complex process involving both Rac and Rho.
    • The physical interaction between plexin-B1 and Rac is not strictly required for Rho activation.
    • These findings provide a foundation for understanding how semaphorins and plexins control axon guidance and cell migration.