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An alternative food source for metabolism and longevity studies in Caenorhabditis elegans
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An alternative food source for metabolism and longevity studies in Caenorhabditis elegans
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An alternative food source for metabolism and longevity studies in Caenorhabditis elegans
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Journal Article
An alternative food source for metabolism and longevity studies in Caenorhabditis elegans
2021
Overview
Caenorhabditis elegans is an instrumental research model used to advance our knowledge in areas including development, metabolism, and aging. However, research on metabolism and/or other measures of health/aging are confounded by the nematode’s food source in the lab, live E. coli bacteria. Commonly used treatments, including ultraviolet irradiation and antibiotics, are successful in preventing bacterial replication, but the bacteria can remain metabolically active. The purpose of this study is to develop a metabolically inactive food source for the worms that will allow us to minimize the confounding effects of bacterial metabolism on worm metabolism and aging. Our strategy is to use a paraformaldehyde (PFA) treated E. coli food source and to determine its effects on worm health, metabolism and longevity. We initially determine the lowest possible concentrations of PFA necessary to rapidly and reproducibly kill bacteria. We then measure various aspects of worm behavior, healthspan and longevity, including growth rate, food attraction, brood size, lifespan and metabolic assessments, such as oxygen consumption and metabolomics. Our resulting data show that worms eat and grow well on these bacteria and support the use of 0.5% PFA-killed bacteria as a nematode food source for metabolic, drug, and longevity experiments.Beydoun, Choi et al. develop a metabolically inactive food source for C. elegans worms that minimizes the confounding effects of bacterial metabolism on worm metabolism and aging. They find that worms eat and grow well on a paraformaldehyde (PFA)-treated E. coli food source, recommending the use of 0.5% PFA-killed bacteria as a nematode food source for metabolic experiments.
