An intervention resembling caloric restriction prolongs life span and retards aging in yeast
The yeast Saccharomyces cerevisiae has a finite life span that is measured by the number of daughter cells an individual produces. The 20 genes known to determine yeast life span appear to function in more than one pathway, implicating a variety of physiological processes in yeast longevity. Less at...
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description | The yeast Saccharomyces cerevisiae has a finite life span that is measured by the number of daughter cells an individual produces. The 20 genes known to determine yeast life span appear to function in more than one pathway, implicating a variety of physiological processes in yeast longevity. Less attention has been focused on environmental effects on yeast aging. We have examined the role that nutritional status plays in determining yeast life span. Reduction of the glucose concentration in the medium led to an increase in life span and to a delay in appearance of an aging phenotype. The increase in life span was the more extensive the lower the glucose levels. Life extension was also elicited by decreasing the amino acids content of the medium. This suggests that it is the decline in calories and not a particular nutrient that is responsible, in striking similarity to the effect on aging of caloric restriction in mammals. The caloric restriction effect did not require the induction of the retrograde response pathway, which signals the functional status of the mitochondrion and determines longevity. Furthermore, deletion of RTG3, a downstream mediator in this pathway, and caloric restriction had an additive effect, resulting in the largest increase (123%) in longevity described thus far in yeast. Thus, retrograde response and caloric restriction operate along distinct pathways in determining yeast longevity. These pathways may be exclusive, at least in part. This provides evidence for multiple mechanisms of metabolic control in yeast aging. Inasmuch as caloric restriction lowers blood glucose levels, this study raises the possibility that reduced glucose alters aging at the cellular level in mammals. |
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This suggests that it is the decline in calories and not a particular nutrient that is responsible, in striking similarity to the effect on aging of caloric restriction in mammals. The caloric restriction effect did not require the induction of the retrograde response pathway, which signals the functional status of the mitochondrion and determines longevity. Furthermore, deletion of RTG3, a downstream mediator in this pathway, and caloric restriction had an additive effect, resulting in the largest increase (123%) in longevity described thus far in yeast. Thus, retrograde response and caloric restriction operate along distinct pathways in determining yeast longevity. These pathways may be exclusive, at least in part. This provides evidence for multiple mechanisms of metabolic control in yeast aging. 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Reduction of the glucose concentration in the medium led to an increase in life span and to a delay in appearance of an aging phenotype. The increase in life span was the more extensive the lower the glucose levels. Life extension was also elicited by decreasing the amino acids content of the medium. This suggests that it is the decline in calories and not a particular nutrient that is responsible, in striking similarity to the effect on aging of caloric restriction in mammals. The caloric restriction effect did not require the induction of the retrograde response pathway, which signals the functional status of the mitochondrion and determines longevity. Furthermore, deletion of RTG3, a downstream mediator in this pathway, and caloric restriction had an additive effect, resulting in the largest increase (123%) in longevity described thus far in yeast. Thus, retrograde response and caloric restriction operate along distinct pathways in determining yeast longevity. 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subjects | aging Amino Acids - pharmacology Basic Helix-Loop-Helix Leucine Zipper Transcription Factors Cell Division - drug effects Culture Media - chemistry Culture Media - pharmacology DNA-Binding Proteins - genetics Dose-Response Relationship, Drug Energy Intake Fungal Proteins - genetics Gene Expression Regulation, Fungal - drug effects Glucose - pharmacology Intracellular Signaling Peptides and Proteins metabolic control Phenotype retrograde response Saccharomyces cerevisiae Saccharomyces cerevisiae - cytology Saccharomyces cerevisiae - drug effects Saccharomyces cerevisiae - genetics Saccharomyces cerevisiae Proteins Time Factors Transcription Factors |
title | An intervention resembling caloric restriction prolongs life span and retards aging in yeast |
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