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Inhibition of cytosolic Phospholipase A(2) prevents prion peptide-induced neuronal damage and co-localisation with Beta III Tubulin
BACKGROUND: Activation of phospholipase A(2) (PLA(2)) and the subsequent metabolism of arachidonic acid (AA) to prostaglandins have been shown to play an important role in neuronal death in neurodegenerative disease. Here we report the effects of the prion peptide fragment HuPrP106-126 on the PLA(2)...
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2012
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3496594/ https://www.ncbi.nlm.nih.gov/pubmed/22928663 http://dx.doi.org/10.1186/1471-2202-13-106 |
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author | Last, Victoria Williams, Alun Werling, Dirk |
author_facet | Last, Victoria Williams, Alun Werling, Dirk |
author_sort | Last, Victoria |
collection | PubMed |
description | BACKGROUND: Activation of phospholipase A(2) (PLA(2)) and the subsequent metabolism of arachidonic acid (AA) to prostaglandins have been shown to play an important role in neuronal death in neurodegenerative disease. Here we report the effects of the prion peptide fragment HuPrP106-126 on the PLA(2) cascade in primary cortical neurons and translocation of cPLA(2) to neurites. RESULTS: Exposure of primary cortical neurons to HuPrP106-126 increased the levels of phosphorylated cPLA(2) and caused phosphorylated cPLA(2) to relocate from the cell body to the cellular neurite in a PrP-dependent manner, a previously unreported observation. HuPrP106-126 also induced significant AA release, an indicator of cPLA(2) activation; this preceded synapse damage and subsequent cellular death. The novel translocation of p-cPLA(2) postulated the potential for exposure to HuPrP106-126 to result in a re-arrangement of the cellular cytoskeleton. However p-cPLA(2) did not colocalise significantly with F-actin, intermediate filaments, or microtubule-associated proteins. Conversely, p-cPLA(2) did significantly colocalise with the cytoskeletal protein beta III tubulin. Pre-treatment with the PLA(2) inhibitor, palmitoyl trifluoromethyl ketone (PACOCF(3)) reduced cPLA(2) activation, AA release and damage to the neuronal synapse. Furthermore, PACOCF(3) reduced expression of p-cPLA(2) in neurites and inhibited colocalisation with beta III tubulin, resulting in protection against PrP-induced cell death. CONCLUSIONS: Collectively, these findings suggest that cPLA(2) plays a vital role in the action of HuPrP106-126 and that the colocalisation of p-cPLA(2) with beta III tubulin could be central to the progress of neurodegeneration caused by prion peptides. Further work is needed to define exactly how PLA(2) inhibitors protect neurons from peptide-induced toxicity and how this relates to intracellular structural changes occurring in neurodegeneration. |
format | Online Article Text |
id | pubmed-3496594 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2012 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-34965942012-11-14 Inhibition of cytosolic Phospholipase A(2) prevents prion peptide-induced neuronal damage and co-localisation with Beta III Tubulin Last, Victoria Williams, Alun Werling, Dirk BMC Neurosci Research Article BACKGROUND: Activation of phospholipase A(2) (PLA(2)) and the subsequent metabolism of arachidonic acid (AA) to prostaglandins have been shown to play an important role in neuronal death in neurodegenerative disease. Here we report the effects of the prion peptide fragment HuPrP106-126 on the PLA(2) cascade in primary cortical neurons and translocation of cPLA(2) to neurites. RESULTS: Exposure of primary cortical neurons to HuPrP106-126 increased the levels of phosphorylated cPLA(2) and caused phosphorylated cPLA(2) to relocate from the cell body to the cellular neurite in a PrP-dependent manner, a previously unreported observation. HuPrP106-126 also induced significant AA release, an indicator of cPLA(2) activation; this preceded synapse damage and subsequent cellular death. The novel translocation of p-cPLA(2) postulated the potential for exposure to HuPrP106-126 to result in a re-arrangement of the cellular cytoskeleton. However p-cPLA(2) did not colocalise significantly with F-actin, intermediate filaments, or microtubule-associated proteins. Conversely, p-cPLA(2) did significantly colocalise with the cytoskeletal protein beta III tubulin. Pre-treatment with the PLA(2) inhibitor, palmitoyl trifluoromethyl ketone (PACOCF(3)) reduced cPLA(2) activation, AA release and damage to the neuronal synapse. Furthermore, PACOCF(3) reduced expression of p-cPLA(2) in neurites and inhibited colocalisation with beta III tubulin, resulting in protection against PrP-induced cell death. CONCLUSIONS: Collectively, these findings suggest that cPLA(2) plays a vital role in the action of HuPrP106-126 and that the colocalisation of p-cPLA(2) with beta III tubulin could be central to the progress of neurodegeneration caused by prion peptides. Further work is needed to define exactly how PLA(2) inhibitors protect neurons from peptide-induced toxicity and how this relates to intracellular structural changes occurring in neurodegeneration. BioMed Central 2012-08-28 /pmc/articles/PMC3496594/ /pubmed/22928663 http://dx.doi.org/10.1186/1471-2202-13-106 Text en Copyright ©2012 Last et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Last, Victoria Williams, Alun Werling, Dirk Inhibition of cytosolic Phospholipase A(2) prevents prion peptide-induced neuronal damage and co-localisation with Beta III Tubulin |
title | Inhibition of cytosolic Phospholipase A(2) prevents prion peptide-induced neuronal damage and co-localisation with Beta III Tubulin |
title_full | Inhibition of cytosolic Phospholipase A(2) prevents prion peptide-induced neuronal damage and co-localisation with Beta III Tubulin |
title_fullStr | Inhibition of cytosolic Phospholipase A(2) prevents prion peptide-induced neuronal damage and co-localisation with Beta III Tubulin |
title_full_unstemmed | Inhibition of cytosolic Phospholipase A(2) prevents prion peptide-induced neuronal damage and co-localisation with Beta III Tubulin |
title_short | Inhibition of cytosolic Phospholipase A(2) prevents prion peptide-induced neuronal damage and co-localisation with Beta III Tubulin |
title_sort | inhibition of cytosolic phospholipase a(2) prevents prion peptide-induced neuronal damage and co-localisation with beta iii tubulin |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3496594/ https://www.ncbi.nlm.nih.gov/pubmed/22928663 http://dx.doi.org/10.1186/1471-2202-13-106 |
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