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Published on: June 29, 2018
Running on empty: how p53 controls INS/IGF signaling and affects life span
Heidi Scrable1, Silvia Medrano, Erica Ungewitter
1University of Virginia, Department of Neuroscience, Charlottesville, Virginia, USA. hs2n@virginia.edu
Experimental Gerontology
|July 5, 2008
Summary
The tumor suppressor p53 influences lifespan by regulating stem cell proliferation and nutrient deprivation responses. Its role in longevity varies across species, prompting a reevaluation of its function in aging.
Area of Science:
- Aging research
- Molecular biology
- Genetics
Background:
- Tissue stem cells are crucial for adult tissue integrity and longevity.
- The tumor suppressor p53 regulates stem cell proliferation and is implicated in aging.
- p53's role in longevity is complex, particularly in species with and without extensive stem cell populations.
Purpose of the Study:
- To reevaluate the function of p53 in lifespan control across different species.
- To explore how p53 regulates longevity through insulin-like signaling pathways.
- To propose a molecular mechanism for p53's role in nutrient deprivation survival.
Main Methods:
- Comparative analysis of p53 function in long- and short-lived organisms.
- Discussion of molecular pathways involving p53, stem cells, and insulin-like signaling.
- Hypothesizing p53's role in cellular stress responses, specifically nutrient deprivation.
Main Results:
- p53 acts as a longevity gene in some species but its loss can extend lifespan in others, indicating context-dependent roles.
- p53 may control longevity by modulating insulin-like signaling in both proliferating and non-proliferating cells.
- Loss of p53 function in metabolically active cells can impair survival during starvation.
Conclusions:
- The function of p53 in lifespan regulation is multifaceted and species-specific.
- p53's involvement in stem cell regulation and stress response pathways is critical for understanding aging.
- Further research is needed to elucidate the paradoxical effects of p53 on longevity and survival.
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