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Starvation response in mouse liver shows strong correlation with life-span-prolonging processes
Matthias Bauer1, Anne C Hamm, Melanie Bonaus
1Institut fuer Genetik, Forschungszentrum Karlsruhe, 76021 Karlsruhe, , Germany.
Physiological Genomics
|February 6, 2004
Summary
Fasting significantly alters gene expression in mouse liver, impacting pathways linked to aging. These changes suggest starvation may trigger a stress response similar to caloric restriction, potentially explaining life-span extension benefits.
Area of Science:
- Molecular biology
- Genomics
- Metabolomics
Background:
- Gene expression patterns are crucial for understanding physiological responses to dietary changes.
- Fasting and caloric restriction are known to influence metabolic pathways and aging processes.
Purpose of the Study:
- To investigate global gene expression changes in mouse liver under fasting and sugar-fed conditions.
- To identify specific signaling and metabolic pathways affected by these dietary states.
- To explore the relationship between fasting-induced gene expression and caloric restriction's effects on aging.
Main Methods:
- Utilized high-density microarrays to monitor gene expression in mouse liver.
- Analyzed approximately 20,000 different genes.
- Grouped significantly regulated genes into specific signaling and metabolic pathways.
Main Results:
- Identified significant alterations in lipid signaling, insulin and dehydroepiandrosterone (DHEA) hormonal pathways, urea cycle, S-adenosylmethionine-based methyl transfer systems, and apoptosis regulators.
- Observed substantial overlap between genes regulated by starvation and those regulated by caloric restriction.
- Fasting elicits a stress response that shares components with caloric restriction.
Conclusions:
- Fasting induces a complex gene expression response in the liver, affecting key metabolic and signaling pathways.
- The overlap in gene regulation between starvation and caloric restriction suggests shared mechanisms.
- These findings support the hypothesis that fasting-induced stress responses may contribute to the life-span extension observed with caloric restriction.