Data from: Chronic high-sugar diet in adulthood protects Caenorhabditis elegans from 6-OHDA induced dopaminergic neurodegeneration

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  • Background: Diets high in saturated fat and sugar, termed 'western diets', have been associated with several negative health outcomes, including increased risk for neurodegenerative disease. Parkinson's Disease (PD) is the second most prevalent neurodegenerative disease and is characterized by the progressive death of dopaminergic neurons in the brain. We build upon previous work characterizing the impact of high sugar diets in Caenorhabditis elegans to mechanistically evaluate the relationship between high sugar diets and dopaminergic neurodegeneration.
    Results: Adult high glucose and fructose diets, or exposure from day 1-5 of adulthood, led to increased lipid content and shorter lifespan and decreased reproduction. However, in contrast to previous reports, we found that adult chronic high-glucose and high-fructose diets did not induce dopaminergic neurodegeneration alone and were protective from 6-hydroxydopamine (6-OHDA) induced degeneration. Neither sugar altered baseline electron transport chain function, and both increased vulnerability to organism-wide ATP depletion when the electron transport chain was inhibited, arguing against energetic rescue as a basis for neuroprotection. The induction of oxidative stress by 6-OHDA is hypothesized to contribute to its pathology, and high sugar diets prevented this increase in the soma of the dopaminergic neurons. However, we did not find increased expression of antioxidant enzymes or glutathione levels. Instead, we found evidence suggesting downregulation of the dopamine reuptake transporter dat-1 that could result in decreased 6-OHDA uptake.
    Conclusion: Our work uncovers a neuroprotective role for high sugar diets, despite concomitant decreases in lifespan and reproduction. Our results support the broader finding that ATP depletion alone is insufficient to induce dopaminergic neurodegeneration, whereas increased neuronal oxidative stress may drive degeneration. Finally, our work highlights the importance of evaluating lifestyle by toxicant interactions.     ... [Read More]

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  • Morton, K. S., Heffernan, N., Ryde, I. T, Hartman, J. H., Meng, L., & Meyer, J. N. (2023). Data from: Chronic high-sugar diet in adulthood protects Caenorhabditis elegans from 6-OHDA induced dopaminergic neurodegeneration. Duke Research Data Repository. https://doi.org/10.7924/r4183gr2w
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  • 10.7924/r4183gr2w
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  • ark:/87924/r4183gr2w
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  • Morton, K. S., Hartman, J. H., Heffernan, N., Ryde, I. T., Kenny-Ganzert, I. W., Meng, L., ... & Meyer, J. N. (2023). Chronic high-sugar diet in adulthood protects Caenorhabditis elegans from 6-OHDA induced dopaminergic neurodegeneration. bioRxiv, 2023-05. https://www.biorxiv.org/content/10.1101/2023.05.29.542737v2
  • Morton, K. S., Hartman, J. H., Heffernan, N., Ryde, I. T., Kenny-Ganzert, I. W., Meng, L., Sherwood, D. R., & Meyer, J. N. (2023). Chronic high-sugar diet in adulthood protects caenorhabditis elegans from 6-OHDA-induced dopaminergic neurodegeneration. BMC Biology, 21(1), 1-252.  https://doi.org/10.1186/s12915-023-01733-9
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  • Data from: Chronic high-sugar diet in adulthood protects Caenorhabditis elegans from 6-OHDA induced dopaminergic neurodegeneration
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file details Autofluoresence.xlsx 2023-10-06 Public Download
file details CEP Neuron roGFP.csv 2023-10-06 Public Download
file details Dopaminergic Neurodegenertation Scores.csv 2023-10-06 Public Download
file details Fat Quantification.xlsx 2023-10-06 Public Download
file details Gene Expression by rtPCR.xlsx 2023-10-06 Public Download
file details KO SWIP.csv 2023-10-06 Public Download
file details Lifespan.csv 2023-10-06 Public Download
file details MORTON_HIGHSUGARINCELEGANS_README.txt 2023-10-06 Public Download
file details Muscle Mitochondria.xlsx 2023-10-06 Public Download
file details Neuronal ATP-ADP Ratio.xlsx 2023-10-06 Public Download

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