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An iTRAQ-based proteomic analysis reveals dysregulation of neocortical synaptopodin in Lewy body dementias
Lewy body dementias are the second most common cause of neurodegenerative dementia in the elderly after Alzheimer’s disease (AD). The two clinical subgroups of Lewy body dementias, namely, dementia with Lewy bodies (DLB) and Parkinson’s disease dementia (PDD), are differentiated by the chronology of...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5553757/ https://www.ncbi.nlm.nih.gov/pubmed/28800743 http://dx.doi.org/10.1186/s13041-017-0316-9 |
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author | Datta, Arnab Chai, Yuek Ling Tan, Jing Min Lee, Jasinda H. Francis, Paul T. Chen, Christopher P. Sze, Siu Kwan Lai, Mitchell K. P. |
author_facet | Datta, Arnab Chai, Yuek Ling Tan, Jing Min Lee, Jasinda H. Francis, Paul T. Chen, Christopher P. Sze, Siu Kwan Lai, Mitchell K. P. |
author_sort | Datta, Arnab |
collection | PubMed |
description | Lewy body dementias are the second most common cause of neurodegenerative dementia in the elderly after Alzheimer’s disease (AD). The two clinical subgroups of Lewy body dementias, namely, dementia with Lewy bodies (DLB) and Parkinson’s disease dementia (PDD), are differentiated by the chronology of cognitive symptoms relative to parkinsonism. At present, there remains a debate on whether DLB and PDD are separate disease entities, or fall within the same spectrum of Lewy body dementias. In this study, we compared the detergent-soluble proteome via an 8-plex isobaric tag for relative and absolute quantitation (iTRAQ) analysis of pooled lysates from the prefrontal cortex (BA9) of DLB (n = 19) and PDD (n = 21) patients matched a priori for amyloid (total Aβ42) burden, semi-quantitative scores for Lewy bodies and neurofibrillary tangles together with age-matched control (n = 21) subjects. A total of 1914 proteins were confidently identified by iTRAQ (false discovery rate = 0%). None of the proteins showed a significant yet opposite regulation in between DLB and PDD when compared to aged controls in the proteomic data set as well as following immunoblot analysis of the pooled and individual lysates involving all 61 subjects. The postsynaptic protein, synaptopodin (SYNPO) was significantly down-regulated in both DLB and PDD subgroups, suggesting a defective synaptic transmission in the demented patients. In conclusion, the largely similar proteome of DLB and PDD matched for amyloid burden suggests that variations in concomitant AD-related pathology, abnormal post-translational modifications or protein-protein interactions, defective intracellular trafficking or misfolding of proteins could play a part in driving the clinically observed differences between these two subgroups of Lewy body dementias. This further indicates that amyloid-targeting therapeutic strategies may show different efficacies in DLB versus PDD. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s13041-017-0316-9) contains supplementary material, which is available to authorized users. |
format | Online Article Text |
id | pubmed-5553757 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-55537572017-08-15 An iTRAQ-based proteomic analysis reveals dysregulation of neocortical synaptopodin in Lewy body dementias Datta, Arnab Chai, Yuek Ling Tan, Jing Min Lee, Jasinda H. Francis, Paul T. Chen, Christopher P. Sze, Siu Kwan Lai, Mitchell K. P. Mol Brain Research Lewy body dementias are the second most common cause of neurodegenerative dementia in the elderly after Alzheimer’s disease (AD). The two clinical subgroups of Lewy body dementias, namely, dementia with Lewy bodies (DLB) and Parkinson’s disease dementia (PDD), are differentiated by the chronology of cognitive symptoms relative to parkinsonism. At present, there remains a debate on whether DLB and PDD are separate disease entities, or fall within the same spectrum of Lewy body dementias. In this study, we compared the detergent-soluble proteome via an 8-plex isobaric tag for relative and absolute quantitation (iTRAQ) analysis of pooled lysates from the prefrontal cortex (BA9) of DLB (n = 19) and PDD (n = 21) patients matched a priori for amyloid (total Aβ42) burden, semi-quantitative scores for Lewy bodies and neurofibrillary tangles together with age-matched control (n = 21) subjects. A total of 1914 proteins were confidently identified by iTRAQ (false discovery rate = 0%). None of the proteins showed a significant yet opposite regulation in between DLB and PDD when compared to aged controls in the proteomic data set as well as following immunoblot analysis of the pooled and individual lysates involving all 61 subjects. The postsynaptic protein, synaptopodin (SYNPO) was significantly down-regulated in both DLB and PDD subgroups, suggesting a defective synaptic transmission in the demented patients. In conclusion, the largely similar proteome of DLB and PDD matched for amyloid burden suggests that variations in concomitant AD-related pathology, abnormal post-translational modifications or protein-protein interactions, defective intracellular trafficking or misfolding of proteins could play a part in driving the clinically observed differences between these two subgroups of Lewy body dementias. This further indicates that amyloid-targeting therapeutic strategies may show different efficacies in DLB versus PDD. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s13041-017-0316-9) contains supplementary material, which is available to authorized users. BioMed Central 2017-08-11 /pmc/articles/PMC5553757/ /pubmed/28800743 http://dx.doi.org/10.1186/s13041-017-0316-9 Text en © The Author(s). 2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Research Datta, Arnab Chai, Yuek Ling Tan, Jing Min Lee, Jasinda H. Francis, Paul T. Chen, Christopher P. Sze, Siu Kwan Lai, Mitchell K. P. An iTRAQ-based proteomic analysis reveals dysregulation of neocortical synaptopodin in Lewy body dementias |
title | An iTRAQ-based proteomic analysis reveals dysregulation of neocortical synaptopodin in Lewy body dementias |
title_full | An iTRAQ-based proteomic analysis reveals dysregulation of neocortical synaptopodin in Lewy body dementias |
title_fullStr | An iTRAQ-based proteomic analysis reveals dysregulation of neocortical synaptopodin in Lewy body dementias |
title_full_unstemmed | An iTRAQ-based proteomic analysis reveals dysregulation of neocortical synaptopodin in Lewy body dementias |
title_short | An iTRAQ-based proteomic analysis reveals dysregulation of neocortical synaptopodin in Lewy body dementias |
title_sort | itraq-based proteomic analysis reveals dysregulation of neocortical synaptopodin in lewy body dementias |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5553757/ https://www.ncbi.nlm.nih.gov/pubmed/28800743 http://dx.doi.org/10.1186/s13041-017-0316-9 |
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