The proteome of neuromelanin granules in dementia with Lewy bodies
- Neuromelanin granules (NMGs) are organelle-like structures present in the human \(\textit {substantia nigra pars compacta}\). In addition to neuromelanin, NMGs contain proteins, lipids and metals. As NMG-containing dopaminergic neurons are preferentially lost in Parkinson's disease and dementia with Lewy bodies (DLB), it is assumed that NMGs may play a role in neurodegenerative processes. Until now, this role is not completely understood and needs further investigation. We therefore set up an exploratory proteomic study to identify differences in the proteomic profile of NMGs from DLB patients (n = 5) compared to healthy controls (CTRL, n = 5). We applied a laser microdissection and mass-spectrometry-based approach, in which we used targeted mass spectrometric experiments for validation. In NMG-surrounding (\(SN_{Surr}\).) tissue of DLB patients, we found evidence for ongoing oxidative damage and an impairment of protein degradation. As a potentially disease-related mechanism, we found \(\alpha\)-synuclein and protein S100A9 to be enriched in NMGs of DLB cases, while the abundance of several ribosomal proteins was significantly decreased. As S100A9 is known to be able to enhance the formation of toxic \(\alpha\)-synuclein fibrils, this finding points towards an involvement of NMGs in pathogenesis, however the exact role of NMGs as either neuroprotective or neurotoxic needs to be further investigated. Nevertheless, our study provides evidence for an impairment of protein degradation, ongoing oxidative damage and accumulation of potentially neurotoxic protein aggregates to be central mechanisms of neurodegeneration in DLB.
Author: | Maximilian WulfORCiDGND, Katalin BarkovitsORCiDGND, Karin SchorkORCiDGND, Martin EisenacherORCiDGND, Peter RiedererGND, Manfred GerlachGND, Britta EggersORCiDGND, Katrin Marcus-AlicORCiDGND |
---|---|
URN: | urn:nbn:de:hbz:294-103467 |
DOI: | https://doi.org/10.3390/cells11223538 |
Parent Title (English): | Cells |
Publisher: | MDPI |
Place of publication: | Basel |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2023/11/07 |
Date of first Publication: | 2022/11/09 |
Publishing Institution: | Ruhr-Universität Bochum, Universitätsbibliothek |
Tag: | Open Access Fonds dementia with Lewy bodies; neurodegeneration; neuromelanin granules; proteomics; stress granules; substantia nigra pars compacta |
Volume: | 11 |
Issue: | 22, Article 3538 |
First Page: | 3538-1 |
Last Page: | 3538-21 |
Note: | Article Processing Charge funded by the Deutsche Forschungsgemeinschaft (DFG) and the Open Access Publication Fund of Ruhr-Universität Bochum. |
Institutes/Facilities: | Medizinisches Proteom-Center |
Zentrum für Protein-Diagnostik (PRODI) | |
open_access (DINI-Set): | open_access |
faculties: | Medizinische Fakultät |
Licence (English): | Creative Commons - CC BY 4.0 - Attribution 4.0 International |