PUBLICATION
Opposing p53 and mTOR/AKT promote an in vivo switch from apoptosis to senescence upon telomere shortening in zebrafish
- Authors
- El Maï, M., Marzullo, M., de Castro, I.P., Ferreira, M.G.
- ID
- ZDB-PUB-200520-12
- Date
- 2020
- Source
- eLIFE 9: (Journal)
- Registered Authors
- Ferreira, Miguel Godinho
- Keywords
- AKT, aging, apoptosis, cell biology, p53, regenerative medicine, senescence, stem cells, telomeres, zebrafish
- MeSH Terms
-
- Aging
- Animals
- Apoptosis/genetics*
- Cell Proliferation
- Cellular Senescence/genetics*
- DNA Damage
- Female
- Male
- Mitochondria
- Mutation
- Phosphorylation
- Proto-Oncogene Proteins c-akt/genetics
- Proto-Oncogene Proteins c-akt/metabolism*
- Reactive Oxygen Species/metabolism
- Signal Transduction
- TOR Serine-Threonine Kinases/genetics
- TOR Serine-Threonine Kinases/metabolism*
- Telomerase/genetics
- Telomerase/metabolism
- Telomere/metabolism
- Telomere Shortening/genetics*
- Tumor Suppressor Protein p53/genetics
- Tumor Suppressor Protein p53/metabolism*
- Zebrafish/genetics*
- Zebrafish/physiology
- PubMed
- 32427102 Full text @ Elife
Citation
El Maï, M., Marzullo, M., de Castro, I.P., Ferreira, M.G. (2020) Opposing p53 and mTOR/AKT promote an in vivo switch from apoptosis to senescence upon telomere shortening in zebrafish. eLIFE. 9:.
Abstract
Progressive telomere shortening during lifespan is associated with restriction of cell proliferation, genome instability and aging. Apoptosis and senescence are the two major outcomes upon irreversible cellular damage. Here, we show a transition of these two cell fates during aging of telomerase deficient zebrafish. In young telomerase mutants, proliferative tissues exhibit DNA damage and p53-dependent apoptosis, but no senescence. However, these tissues in older animals display loss of cellularity and senescence becomes predominant. Tissue alterations are accompanied by a pro-proliferative stimulus mediated by AKT signaling. Upon AKT activation, FoxO transcription factors are phosphorylated and translocated out of the nucleus. This results in reduced SOD2 expression causing an increase of ROS and mitochondrial dysfunction. These alterations induce p15/16 growth arrest and senescence. We propose that, upon telomere shortening, early apoptosis leads to cell depletion and insufficient compensatory proliferation. Following tissue damage, the mTOR/AKT is activated causing mitochondrial dysfunction and p15/16-dependent senescence.
Genes / Markers
Expression
Phenotype
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Fish
Orthology
Engineered Foreign Genes
Mapping