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Opposing activities protect against age-onset proteotoxicity

Ehud Cohen1, Jan Bieschke, Rhonda M Perciavalle

  • 1Molecular and Cell Biology Laboratory, Salk Institute for Biological Studies, 10010 North Torrey Pines Road, La Jolla, CA 92037, USA.

Science (New York, N.Y.)
|August 12, 2006
PubMed

Insights

Slowing aging by decreasing insulin/insulin growth factor-1-like signaling (IIS) reduced Abeta(1-42) peptide aggregation toxicity. Transcription factors HSF-1 and DAF-16 modulate protein aggregation and disaggregation, linking aging to proteotoxicity.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Genetics

Background:

  • Aberrant protein aggregation, like Abeta(1-42) misassembly, is characteristic of neurodegenerative diseases such as Alzheimer's.
  • The insulin/insulin growth factor-1-like signaling (IIS) pathway regulates aging and cellular stress responses across species.

Purpose of the Study:

  • To investigate the mechanistic link between aging and protein aggregation-mediated toxicity.
  • To explore the role of the IIS pathway in modulating Abeta(1-42) aggregation and toxicity.

Main Methods:

  • Utilized Caenorhabditis elegans as a model organism.
  • Manipulated the insulin/insulin growth factor-1-like signaling (IIS) pathway to slow aging.
  • Assessed the impact on Abeta(1-42) peptide aggregation and toxicity.
  • Investigated the roles of downstream transcription factors, heat shock factor 1 (HSF-1) and DAF-16.

Main Results:

  • Decreased IIS, leading to slowed aging, significantly reduced Abeta(1-42) aggregation toxicity in C. elegans.
  • The transcription factors HSF-1 and DAF-16 were identified as key regulators of opposing disaggregation and aggregation activities.
  • These factors promote cellular survival in the context of persistent toxic protein aggregation.

Conclusions:

  • The IIS pathway provides a mechanistic link between the aging process and proteotoxicity mediated by protein aggregation.
  • Modulating aging through IIS can mitigate the harmful effects of protein misassembly, offering potential therapeutic insights for neurodegenerative diseases.

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