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Updated: May 7, 2026
Measurement of Survival Time in Brachionus Rotifers: Synchronization of Maternal Conditions
Published on: July 22, 2016
Lifespan extension of rotifers by treatment with red algal extracts
David J Snare1, Allison M Fields, Terry W Snell
1School of Chemistry and Biochemistry, Aquatic Chemical Ecology Center, Institute for Bioengineering and Bioscience, Georgia Institute of Technology, Atlanta, GA 30332, United States.
Abstract:
Aging results from an accumulation of damage to macromolecules inhibiting cellular replication, repair, and other necessary functions. Damage may be due to environmental stressors such as metal toxicity, oxidative stress caused by imperfections in electron transfer reactions, or other metabolic processes. In an effort to discover medical treatments that counteract this damage, we initiated a search for small molecule drugs from natural sources using life table experiments which, through their unbiased approach, present the opportunity to discover first-in-class molecules. We have identified marine red algae as a source of natural products that slow aging of the invertebrate rotifer Brachionus manjavacas. Rotifers are a promising model organism for life extension studies as they maintain a short, measurable lifespan while also having an extensive literature related to aging. Rotifer lifespan was increased 9-14% by exposure to three of a total of 200 screened red algal extracts. Bioassay guided fractionation led to semi-purified extracts composed primarily of lipids responsible for rotifer life extension. The life extending mixture from the red alga Acanthophora spicifera contained eicosanoic, octadecanoic, and hexadecanoic acids as well as several unidentified unsaturated fatty acids. The life extending effects of these small molecule mixtures are not a result of their direct antioxidant capacity; other unknown mechanisms of action are likely involved. An understanding of how these natural products interact with their molecular targets could lead to selective and effective treatments for slowing aging and reducing age related diseases.
Insights
Marine red algae extracts significantly extend rotifer lifespan by 9-14%. Lipids, including specific fatty acids, were identified as the active compounds, suggesting novel anti-aging mechanisms beyond direct antioxidant effects.
Area of Science:
- Gerontology and Marine Natural Products Chemistry
Background:
- Aging is characterized by accumulated molecular damage, impairing cellular functions.
- Environmental factors like metal toxicity and oxidative stress contribute to aging processes.
- Discovering novel therapeutic interventions for aging and age-related diseases is a critical research area.
Purpose of the Study:
- To identify natural products from marine sources that can slow the aging process.
- To utilize unbiased life table experiments for discovering novel anti-aging compounds.
- To investigate marine red algae as a source for potential life-extension molecules.
Main Methods:
- Screening of 200 red algal extracts using life table experiments in the model organism *Brachionus manjavacas* (rotifers).
- Bioassay-guided fractionation to isolate and identify the active compounds responsible for life extension.
- Chemical analysis of active extracts to determine the composition of life-extending mixtures.
Main Results:
- Three out of 200 red algal extracts demonstrated a significant increase in rotifer lifespan (9-14%).
- Semi-purified extracts, primarily composed of lipids, were responsible for the observed life extension.
- The active mixture from *Acanthophora spicifera* contained eicosanoic, octadecanoic, hexadecanoic acids, and unidentified unsaturated fatty acids.
Conclusions:
- Marine red algae, specifically *Acanthophora spicifera*, yield natural products that extend lifespan in rotifers.
- The life-extending effects are attributed to lipid components, not direct antioxidant activity, indicating novel mechanisms of action.
- Further research into these natural products' molecular targets could lead to new treatments for aging and related diseases.
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01:21Green Algae