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A role for Drosophila IAP1-mediated caspase inhibition in Rac-dependent cell migration

Erika R Geisbrecht1, Denise J Montell

  • 1Department of Biological Chemistry, Johns Hopkins School of Medicine, 725 N. Wolfe Street, Baltimore, MD 21205, USA.

Cell
|July 10, 2004
PubMed

Insights

Drosophila border cell migration reveals an apoptosis-independent role for DIAP1 in Rac-mediated cell motility. Inhibiting Dronc via DIAP1 or Dark protein rescues RacN17 migration defects, highlighting a novel function for DIAP1.

Area of Science:

  • Cell Biology
  • Developmental Biology
  • Genetics

Background:

  • Border cell migration in Drosophila serves as a model for epithelial to migratory cell transitions.
  • Rac GTPase signaling is crucial for regulating cell migration, and dominant-negative Rac inhibits this process.
  • Understanding genes involved in Rac-dependent cell motility is key to deciphering migratory mechanisms.

Purpose of the Study:

  • To identify novel genes regulating Rac-dependent cell motility.
  • To investigate the role of Drosophila inhibitor of apoptosis 1 (DIAP1) in cell migration.
  • To elucidate the mechanism of DIAP1's function in Rac-mediated motility.

Main Methods:

  • Genetic screen for suppressors of dominant-negative Rac-induced migration defects.
  • Overexpression and loss-of-function studies of the thread (th) gene encoding DIAP1.
  • Analysis of mutations affecting the Dark protein, a Dronc caspase activator.

Main Results:

  • Overexpression of DIAP1 (encoded by thread) suppressed dominant-negative Rac-induced migration defects.
  • Loss-of-function mutations in thread caused migration defects without inducing apoptosis.
  • Mutations in Dark also rescued RacN17 migration defects, suggesting an apoptosis-independent pathway.

Conclusions:

  • DIAP1 plays an apoptosis-independent role in Rac-mediated cell motility.
  • DIAP1-mediated inhibition of the caspase Dronc is involved in regulating Rac-dependent cell migration.
  • This study uncovers a novel function for DIAP1 beyond apoptosis regulation in cell motility.

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