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Polyunsaturated Fatty Acids Protect Against Prion-Mediated Synapse Damage In Vitro

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Abstract

A loss of synapses is characteristic of the early stages of the prion diseases. Here we modelled the synapse damage that occurs in prion diseases by measuring the amount of synaptophysin, a pre-synaptic membrane protein essential for neurotransmission, in cortical or hippocampal neurones incubated with the disease associated isoform of the prion protein (PrPSc), or with the prion-derived peptide PrP82-146. The addition of PrPSc or PrP82-146 caused a dose-dependent reduction in the synaptophysin content of PrP wildtype neurones indicative of synapse damage. They did not affect the synaptophysin content of PrP null neurones. The loss of synaptophysin in PrP wildtype neurones was preceded by the accumulation of PrP82-146 within synapses. Since supplements containing polyunsaturated fatty acids (PUFA) are frequently taken for their perceived health benefits including reported amelioration of neurodegenerative conditions, the effects of some common PUFA on prion-mediated synapse damage were examined. Pre-treatment of cortical or hippocampal neurones with docosahexaenoic (DHA) or eicosapentaenoic acids (EPA) protected neurones against the loss of synaptophysin induced by PrP82-146 or PrPSc. This effect of DHA and EPA was selective as they did not alter the loss of synaptophysin induced by a snakevenom neurotoxin. The effects of DHA and EPA were associated with a significant reduction in the amount of FITC-PrP82-146 that accumulated within synapses. Such observations raise the possibility that supplements containing PUFA may protect against the synapse damage and cognitive loss seen during the early stages of prion diseases.

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Acknowledgements

This work was supported by the European Commission FP6 “Neuroprion”—Network of Excellence.

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Authors and Affiliations

  1. Department of Pathology and Infectious Diseases, Royal Veterinary College, Hawkshead Lane, North Mymms, Herts, AL9 7TA, UK

    Clive Bate, Mourad Tayebi & Alun Williams

  2. Department of Molecular Biochemistry and Pharmacology, Istituto di Ricerche Farmacologiche “Mario Negri”, Via La Masa 19, 20156, Milan, Italy

    Mario Salmona & Luisa Diomede

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  1. Clive Bate
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  2. Mourad Tayebi
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Correspondence to Clive Bate.

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Bate, C., Tayebi, M., Salmona, M. et al. Polyunsaturated Fatty Acids Protect Against Prion-Mediated Synapse Damage In Vitro. Neurotox Res 17, 203–214 (2010). https://doi.org/10.1007/s12640-009-9093-2

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