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Inhibition of growth signaling pathways protects against aging and age-related diseases in parallel with reduced oxidative stress. The relationships between growth signaling, oxidative stress and aging remain unclear. Here we report that in Saccharomyces cerevisiae, alterations in growth signaling pathways impact levels of superoxide anions that promote chronological aging and inhibit growth arrest of stationary phase cells in G0/G1. Factors that decrease intracellular superoxide anions in parallel with enhanced longevity and more efficient G0/G1 arrest include genetic inactivation of growth signaling pathways that inhibit Rim15p, which activates oxidative stress responses, and downregulation of these pathways by caloric restriction. Caloric restriction also reduces superoxide anions independently of Rim15p by elevating levels of H₂O₂, which activates superoxide dismutases. In contrast, high glucose or mutations that activate growth signaling accelerate chronological aging in parallel with increased superoxide anions and reduced efficiency of stationary phase G0/G1 arrest. High glucose also activates DNA damage responses and preferentially kills stationary phase cells that fail to arrest growth in G0/G1. These findings suggest that growth signaling promotes chronological aging in budding yeast by elevating superoxide anions that inhibit quiescence and induce DNA replication stress. A similar mechanism likely contributes to aging and age-related diseases in complex eukaryotes.
Caloric restriction, Longevity, Apoptosis, Protein Serine-Threonine Kinases, Models, Biological, Resting Phase, Cell Cycle, Antioxidants, S Phase, Cellular Senescence, Caloric Restriction, Cell Proliferation, Cyclin-Dependent Kinase Inhibitor Proteins, Lifespan, G1 Phase, Replication stress, Hydrogen Peroxide, Hydrogen-Ion Concentration, Hydrogen peroxide, Catalase, Culture Media, Glucose, Oxidative stress, Protein Kinases, Gene Deletion, DNA Damage
Caloric restriction, Longevity, Apoptosis, Protein Serine-Threonine Kinases, Models, Biological, Resting Phase, Cell Cycle, Antioxidants, S Phase, Cellular Senescence, Caloric Restriction, Cell Proliferation, Cyclin-Dependent Kinase Inhibitor Proteins, Lifespan, G1 Phase, Replication stress, Hydrogen Peroxide, Hydrogen-Ion Concentration, Hydrogen peroxide, Catalase, Culture Media, Glucose, Oxidative stress, Protein Kinases, Gene Deletion, DNA Damage
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| influence This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically). | Top 10% | |
| impulse This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network. | Top 1% |
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