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Updated: Mar 19, 2026
07:06
Metabolic Analysis of Drosophila melanogaster Larval and Adult Brains
Published on: August 7, 2018
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Do metabolic fluxes change with age?
Sebastian J Hofer1, Anna Katharina Simon1, Frank Madeo2
1Max-Delbrück Center for Molecular Medicine in the Helmholtz Association (MDC), Berlin 13125, Germany.
Trends in Endocrinology and Metabolism: TEM
|March 18, 2026
Summary
Aging alters metabolite concentrations but not metabolic fluxes, challenging current understanding of age-related metabolic changes. This study re-evaluates the nature of metabolic disturbances during aging.
Area of Science:
- Metabolomics and Fluxomics
- Aging Biology
- Cellular Metabolism
Background:
- Metabolomes, the complete set of small molecules, are known to change significantly with advancing age.
- However, the functional consequences of these metabolic shifts on cellular processes during aging remain incompletely understood.
- Previous studies often focus on static metabolite levels, potentially overlooking dynamic metabolic pathway activity.
Purpose of the Study:
- To investigate the relationship between age-related changes in metabolite concentrations and metabolic fluxes.
- To reconcile the apparent contradiction between altered metabolomes and preserved fluxes in aging.
- To provide a revised perspective on the mechanisms underlying age-related metabolic disturbances.
Main Methods:
- Analysis of metabolomic data from aged mice.
- Application of fluxomics techniques to assess metabolic pathway activity in aged mice.
- Comparative analysis of metabolite concentrations and fluxes between young and aged subjects.
Main Results:
- Significant alterations in metabolite concentrations were observed in aged mice compared to younger controls.
- Metabolic fluxes, representing the rate of metabolite turnover, were found to be largely preserved in aged mice.
- This indicates a decoupling between metabolite abundance and pathway activity during the aging process.
Conclusions:
- Age-related metabolic disturbances may not solely be driven by widespread changes in metabolic pathway activity.
- The observed preservation of fluxes suggests compensatory mechanisms or a recalibration of metabolic networks with age.
- These findings necessitate a re-evaluation of how metabolic aging impacts cellular function and organismal health.
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