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Phosphatidylethanolamine positively regulates autophagy and longevity
P Rockenfeller1, M Koska1, F Pietrocola2
1Institute of Molecular Biosciences, NAWI Graz, University of Graz, Humboldtstr. 50, 8010 Graz, Austria.
Cell Death and Differentiation
|January 10, 2015
Summary
Phosphatidylethanolamine (PE) abundance positively regulates autophagy, a cellular process that slows aging. Supplementing with ethanolamine extended lifespan in yeast, mammalian cells, and flies, suggesting dietary ethanolamine may improve healthspan.
Area of Science:
- Cellular biology
- Aging research
- Metabolism
Background:
- Autophagy is a crucial cellular recycling mechanism that clears damaged components, thereby retarding the aging process.
- The precise molecular regulators of autophagy, particularly those linked to cellular metabolism, remain incompletely understood.
Purpose of the Study:
- To investigate the role of phosphatidylethanolamine (PE) in regulating autophagy.
- To explore the potential of modulating PE levels to influence aging and lifespan.
Main Methods:
- Genetic manipulation of phosphatidylserine decarboxylase (PSD) genes in yeast to alter intracellular PE levels.
- Administration of ethanolamine and overexpression of PE-generating enzymes in yeast and mammalian cell cultures.
- Lifespan assessment in yeast, mammalian cells, and Drosophila melanogaster models.
Main Results:
- Reduced intracellular PE levels accelerated aging phenotypes, including reactive oxygen species production and cell death.
- Increased intracellular PE levels, via ethanolamine supplementation or Psd1 overexpression, enhanced autophagic flux.
- Administration of ethanolamine significantly extended the lifespan across multiple model organisms.
Conclusions:
- Intracellular phosphatidylethanolamine (PE) availability acts as a key regulator of autophagic flux.
- Modulating PE levels through ethanolamine supplementation offers a potential strategy to enhance autophagy and extend organismal healthspan.
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