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TOR-mediated autophagy regulates cell death in Drosophila neurodegenerative disease

Tao Wang1, Uyen Lao, Bruce A Edgar

  • 1Basic Sciences Division, Fred Hutchinson Cancer Research Center, Seattle, WA 98109, USA.

The Journal of Cell Biology
|September 2, 2009
PubMed

Insights

Target of rapamycin (TOR) signaling suppresses autophagy, leading to cell death. Inhibiting TOR or boosting autophagy protects against neurodegeneration in fruit fly models.

Area of Science:

  • Cell biology
  • Neuroscience
  • Genetics

Background:

  • Target of rapamycin (TOR) signaling regulates cell growth and can promote cell death.
  • TOR activity negatively impacts autophagy, a cell-survival process.
  • Disrupting autophagy is linked to neurodegeneration, but the TOR-autophagy-cell death connection is unclear.

Purpose of the Study:

  • To investigate the functional link between TOR signaling, autophagy, and cell death.
  • To determine if TOR-induced cell death is mediated by autophagy suppression.
  • To assess the therapeutic potential of modulating TOR or autophagy in neurodegenerative models.

Main Methods:

  • Utilized the Drosophila melanogaster visual system for studying TOR signaling.
  • Examined age- and light-dependent photoreceptor cell death.
  • Genetically manipulated TOR activity and autophagy levels.
  • Assessed cell death in Drosophila models of Huntington's disease and norpA-mediated retinal degeneration.

Main Results:

  • Hyperactivation of TOR caused age- and light-dependent photoreceptor cell death.
  • TOR-induced cell death was attributed to the suppression of autophagy.
  • Inhibiting TOR or inducing autophagy suppressed cell death in Huntington's disease and norpA models.

Conclusions:

  • TOR signaling induces cell death primarily by suppressing autophagy.
  • Autophagy plays a protective role against cell death in neurodegenerative conditions.
  • Modulating the TOR-autophagy pathway is a potential therapeutic strategy for neurodegenerative diseases.

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