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A collective form of cell death requires homeodomain interacting protein kinase

Nichole Link1, Po Chen, Wan-Jin Lu

  • 1Department of Cell Biology, UT Southwestern Medical Center, Dallas, TX 75390, USA.

The Journal of Cell Biology
|August 8, 2007
PubMed

Insights

This study reveals that Drosophila wing epithelial cells undergo coordinated "suicide waves" for elimination, controlled by key apoptosis proteins. Homeodomain interacting protein kinase (HIPK) is crucial for this collective cell death, impacting cell numbers.

Area of Science:

  • Developmental Biology
  • Cell Death Mechanisms
  • Drosophila melanogaster Research

Background:

  • Epithelial tissue elimination is crucial during development.
  • Apoptosis, a programmed cell death, is well-studied in early development.
  • A unique form of collective cell death in the Drosophila wing epithelium was previously observed.

Purpose of the Study:

  • To investigate the molecular mechanisms of post-eclosion epithelial cell death in the Drosophila wing.
  • To identify novel genes involved in this collective cell death process.
  • To understand the role of homeodomain interacting protein kinase (HIPK) in regulating cell death and cell numbers.

Main Methods:

  • In vivo examination of Drosophila wing epithelium.
  • Genetic analysis of apoptosis pathway components (Dronc, Dark, Reaper, Grim, Hid).
  • Utilizing mosaic animals and a late-onset blemishing phenotype to screen for relevant genes.

Main Results:

  • Collective "suicide waves" mediate coordinated epithelial sheet death without engulfment.
  • Genetic defects in apoptosis pathways lead to cell persistence and a blemishing phenotype.
  • Homeodomain interacting protein kinase (HIPK) was identified as essential for collective wing epithelial cell death.

Conclusions:

  • The Drosophila wing epithelium undergoes a unique, coordinated cell death process regulated by conserved apoptosis machinery.
  • HIPK plays a critical role in this collective cell death and in controlling cell numbers across multiple tissues.
  • This research uncovers a novel function for HIPK in regulating cell death and tissue homeostasis.

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