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Related Experiment Videos

DRONC coordinates cell death and compensatory proliferation.

Shu Kondo1, Nanami Senoo-Matsuda, Yasushi Hiromi

  • 1Department of Genetics, Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan.

Molecular and Cellular Biology
|September 19, 2006
PubMed
Summary
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Dying cells trigger compensatory proliferation. The initiator caspase DRONC (Drosophila melanogaster caspase homolog 1) in Drosophila coordinates both apoptosis execution and this subsequent proliferation, revealing a dual role in cell death pathways.

Area of Science:

  • Cell biology
  • Developmental biology
  • Genetics

Background:

  • Accidental cell death typically triggers compensatory proliferation to maintain tissue homeostasis.
  • Dying cells, even those kept alive artificially, can induce compensatory proliferation, suggesting a link to the apoptosis program.

Purpose of the Study:

  • To investigate the genetic basis of compensatory proliferation in Drosophila.
  • To determine the role of caspases in coordinating apoptosis and compensatory proliferation.

Main Methods:

  • Genetic analysis of five Drosophila caspase mutants.
  • Induction of artificial compensatory proliferation using Reaper and p35 coexpression.
  • Gamma-irradiation to induce cell death and subsequent proliferation.

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Main Results:

  • The initiator caspase DRONC and effector caspase DRICE are crucial for apoptosis execution.
  • DRONC is essential for both apoptosis and compensatory proliferation; its absence suppresses proliferation.
  • Compensatory proliferation after gamma-irradiation is enhanced in drice mutants, where cells survive DRONC activation.

Conclusions:

  • The apoptotic pathway bifurcates at the initiator caspase DRONC.
  • DRONC plays a central role in coordinating the execution of cell death and compensatory proliferation in Drosophila imaginal discs.