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New label-free automated survival assays reveal unexpected stress resistance patterns during C. elegans aging

Benedetto, A; Bambade, T; Au, C; Tullet, JMA; Monkhouse, J; Dang, H; Cetnar, K; ... Gems, D; + view all (2019) New label-free automated survival assays reveal unexpected stress resistance patterns during C. elegans aging. Aging Cell , Article e12998. 10.1111/acel.12998. (In press). Green open access

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Abstract

Caenorhabditis elegans is an excellent model for high-throughput experimental approaches but lacks an automated means to pinpoint time of death during survival assays over a short time frame, that is, easy to implement, highly scalable, robust, and versatile. Here, we describe an automated, label-free, high-throughput method using death-associated fluorescence to monitor nematode population survival (dubbed LFASS for label-free automated survival scoring), which we apply to severe stress and infection resistance assays. We demonstrate its use to define correlations between age, longevity, and severe stress resistance, and its applicability to parasitic nematodes. The use of LFASS to assess the effects of aging on susceptibility to severe stress revealed an unexpected increase in stress resistance with advancing age, which was largely autophagy-dependent. Correlation analysis further revealed that while severe thermal stress resistance positively correlates with lifespan, severe oxidative stress resistance does not. This supports the view that temperature-sensitive protein-handling processes more than redox homeostasis underpin aging in C. elegans. That the ages of peak resistance to infection, severe oxidative stress, heat shock, and milder stressors differ markedly suggests that stress resistance and health span do not show a simple correspondence in C. elegans.

Type: Article
Title: New label-free automated survival assays reveal unexpected stress resistance patterns during C. elegans aging
Open access status: An open access version is available from UCL Discovery
DOI: 10.1111/acel.12998
Publisher version: https://doi.org/10.1111/acel.12998
Language: English
Additional information: © 2019 The Authors. Aging Cell published by Anatomical Society and John Wiley & Sons Ltd. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.
Keywords: C. elegans, aging, autophagy, infection, stress, survival
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Life Sciences > Div of Biosciences > Genetics, Evolution and Environment
URI: https://discovery.ucl.ac.uk/id/eprint/10078369
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