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Related Experiment Videos

Caspases function in autophagic programmed cell death in Drosophila.

Damali N Martin1, Eric H Baehrecke

  • 1Center for Biosystems Research, University of Maryland Biotechnology Institute, and Department of Cell Biology, University of Maryland, College Park, Maryland 20742, USA.

Development (Cambridge, England)
|December 12, 2003
PubMed
Summary

Autophagic cell death in Drosophila salivary glands is regulated by caspases, distinct from apoptosis. Steroid activation influences cytoskeletal changes and cell degradation, revealing caspases

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Genetics

Background:

  • Autophagic programmed cell death involves self-digestion of cytoplasmic components, differing from apoptosis where phagocytes engulf and digest cells.
  • Mechanisms regulating autophagic cell death are less understood compared to apoptosis.

Purpose of the Study:

  • To investigate the regulatory mechanisms of autophagic cell death in Drosophila salivary glands.
  • To determine the role of caspases and steroid signaling in this process.

Main Methods:

  • Morphological analysis of Drosophila salivary glands undergoing cell death.
  • Examination of cytoskeletal components (Actin, Tubulin, Spectrin) and nuclear Lamins.
  • Assay of active Caspase 3 levels and analysis of mutations in steroid-regulated genes.

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  • Inhibition of caspases using p35 or dominant-negative Dronc.

    • Main Results:

    • Drosophila salivary glands exhibit autophagic cell death with cytoplasmic fragmentation, independent of phagocytes.
    • Changes in cytoskeletal proteins and nuclear Lamins precede gland destruction and correlate with active Caspase 3.
    • Mutations in specific steroid-regulated genes prevent cell death and alter protein localization.
    • Caspase inhibition blocks cell death and nuclear/cytoskeletal changes, but not all Actin reorganization.

    Conclusions:

    • Steroid activation of caspases regulates autophagic cell death in Drosophila salivary glands.
    • Caspases play a role in autophagic cell death, not exclusively in apoptosis.
    • Cytoskeletal elements are involved in the morphological changes during salivary gland autophagic cell death.