1
|
Taheri M, Bahrami A, Asadi KK, Mohammadi M, Molaei P, Hashemi M, Nouri F. A review on nonviral, nonbacterial infectious agents toxicity involved in neurodegenerative diseases. Neurodegener Dis Manag 2023; 13:351-369. [PMID: 38357803 DOI: 10.2217/nmt-2023-0004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2024] Open
Abstract
Neuronal death, decreased activity or dysfunction of neurotransmitters are some of the pathophysiological reasons for neurodegenerative diseases like Alzheimer's, Parkinson's and multiple sclerosis. Also, there is evidence for the role of infections and infectious agents in neurodegenerative diseases and the effect of some metabolites in microorganisms in the pathophysiology of these diseases. In this study, we intend to evaluate the existing studies on the role of infectious agents and their metabolites on the pathophysiology of neurodegenerative diseases. PubMed, Scopus, Google Scholar and Web of Science search engines were searched. Some infectious agents have been observed in neurodegenerative diseases. Also, isolations of some fungi and microalgae have an improving effect on Parkinson's and Alzheimer's.
Collapse
Affiliation(s)
- Mohammad Taheri
- Department of Medical Microbiology, Faculty of Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Ali Bahrami
- Student Research Committee, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Kiana Kimiaei Asadi
- Student Research Committee, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Mojdeh Mohammadi
- Department of Pharmacology & Toxicology, School of Pharmacy, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Pejman Molaei
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Mehrdad Hashemi
- Department of Genetics, Faculty of Advanced Science & Technology, Tehran Medical Sciences, Islamic Azad University, Tehran, Iran
| | - Fatemeh Nouri
- Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
- Department of Pharmaceutical Biotechnology, School of Pharmacy, Hamadan University of Medical Sciences, Hamadan, Iran
| |
Collapse
|
2
|
Devi S, Garg DK, Bhat R. Kinetic control in amyloid polymorphism: Different agitation and solution conditions promote distinct amyloid polymorphs of alpha-synuclein. BIOCHIMICA ET BIOPHYSICA ACTA. PROTEINS AND PROTEOMICS 2023; 1871:140917. [PMID: 37061153 DOI: 10.1016/j.bbapap.2023.140917] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 04/01/2023] [Accepted: 04/11/2023] [Indexed: 04/17/2023]
Abstract
Aggregation of neuronal protein α-synuclein is implicated in synucleinopathies, including Parkinson's disease. Despite abundant in vitro studies, the mechanism of α-synuclein assembly process remains ambiguous. In this work, α-synuclein aggregation was induced by its constant mixing in two separate modes, either by agitation in a 96-well microplate reader (MP) or in microcentrifuge tubes using a shaker incubator (SI). Aggregation in both modes occurred through a sigmoidal growth pattern with a well-defined lag, growth, and saturation phase. The end-stage MP- and SI-derived aggregates displayed distinct differences in morphological, biochemical, and spectral signatures as discerned through AFM, proteinase-K digestion, FTIR, Raman, and CD spectroscopy. The MP-derived aggregates showed irregular morphology with a significant random coil conformation, contrary to SI-derived aggregates, which showed typical β-sheet fibrillar structures. The end-stage MP aggregates convert to β-rich SI-like aggregates upon 1) seeding with SI-derived aggregates and 2) agitating in SI. We conclude that end-stage MP aggregates were in a kinetically trapped conformation, whose kinetic barrier was bypassed upon either seeding by SI-derived fibrils or shaking in SI. We further show that MP-derived aggregates that form in the presence of sorbitol, an osmolyte, displayed a β-rich signature, indicating that the preferential exclusion effect of osmolytes helped overcome the kinetic barrier. Our findings help in unravelling the kinetic origin of different α-synuclein aggregated polymorphs (strains) that encode diverse variants of synucleinopathies. We demonstrate that kinetic control shapes the polymorphic landscape of α-synuclein aggregates, both through de novo generation of polymorphs, and by their interconversion.
Collapse
Affiliation(s)
- Santosh Devi
- School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India
| | - Dushyant Kumar Garg
- School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India
| | - Rajiv Bhat
- School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India.
| |
Collapse
|
3
|
Gao V, Briano JA, Komer LE, Burré J. Functional and Pathological Effects of α-Synuclein on Synaptic SNARE Complexes. J Mol Biol 2023; 435:167714. [PMID: 35787839 PMCID: PMC10472340 DOI: 10.1016/j.jmb.2022.167714] [Citation(s) in RCA: 17] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2022] [Revised: 06/24/2022] [Accepted: 06/27/2022] [Indexed: 02/07/2023]
Abstract
α-Synuclein is an abundant protein at the neuronal synapse that has been implicated in Parkinson's disease for over 25 years and characterizes the hallmark pathology of a group of neurodegenerative diseases now known as the synucleinopathies. Physiologically, α-synuclein exists in an equilibrium between a synaptic vesicle membrane-bound α-helical multimer and a cytosolic largely unstructured monomer. Through its membrane-bound state, α-synuclein functions in neurotransmitter release by modulating several steps in the synaptic vesicle cycle, including synaptic vesicle clustering and docking, SNARE complex assembly, and homeostasis of synaptic vesicle pools. These functions have been ascribed to α-synuclein's interactions with the synaptic vesicle SNARE protein VAMP2/synaptobrevin-2, the synaptic vesicle-attached synapsins, and the synaptic vesicle membrane itself. How α-synuclein affects these processes, and whether disease is due to loss-of-function or gain-of-toxic-function of α-synuclein remains unclear. In this review, we provide an in-depth summary of the existing literature, discuss possible reasons for the discrepancies in the field, and propose a working model that reconciles the findings in the literature.
Collapse
Affiliation(s)
- Virginia Gao
- Appel Alzheimer's Disease Research Institute & Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY, USA; Department of Neurology, New York Presbyterian/Weill Cornell Medicine, New York, NY, USA.
| | - Juan A Briano
- Appel Alzheimer's Disease Research Institute & Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY, USA
| | - Lauren E Komer
- Appel Alzheimer's Disease Research Institute & Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY, USA. https://www.twitter.com/lauren_komer
| | - Jacqueline Burré
- Appel Alzheimer's Disease Research Institute & Brain and Mind Research Institute, Weill Cornell Medicine, New York, NY, USA.
| |
Collapse
|
4
|
Review on the interactions between dopamine metabolites and α-Synuclein in causing Parkinson's disease. Neurochem Int 2023; 162:105461. [PMID: 36460239 DOI: 10.1016/j.neuint.2022.105461] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 11/26/2022] [Accepted: 11/28/2022] [Indexed: 12/05/2022]
Abstract
Parkinson's disease (PD) is characterized by an abnormal post-translational modifications (PTM) in amino acid sequence and aggregation of alpha-synuclein (α-Syn) protein. It is generally believed that dopamine (DA) metabolite in dopaminergic (DAergic) neurons promotes the aggregation of toxic α-Syn oligomers and protofibrils, whereas DA inhibits the formation of toxic fibers and even degrades the toxic fibers. Therefore, the study on interaction between DA metabolites and α-Syn oligomers is one of the current hot topics in neuroscience, because this effect may have direct relevance to the selective DAergic neuron loss in PD. Several mechanisms have been reported for DA metabolites induced α-Syn oligomers viz. i) The reactive oxygen species (ROS) released during the auto-oxidation or enzymatic oxidation of DA changes the structure of α-Syn by the oxidation of amino acid residue leading to misfolding, ii) The oxidized DA metabolites directly interact with α-Syn through covalent or non-covalent bonding leading to the formation of oligomers, iii) DA interacts with lipid or autophagy related proteins to decreases the degradation efficiency of α-Syn aggregates. However, there is no clear-cut mechanism proposed for the interaction between DA and α-Syn. However, it is believed that the lysine (Lys) side chain of α-Syn sequence is the initial trigger site for the oligomer formation. Herein, we review different chemical mechanism involved during the interaction of Lys side chain of α-Syn with DA metabolites such as dopamine-o-quinone (DAQ), dopamine-chrome (DAC), dopamine-aldehyde (DOPAL) and neuromelanin. This review also provides the promotive effect of divalent Cu2+ ions on DA metabolites induced α-Syn oligomers and its inhibition effect by antioxidant glutathione (GSH).
Collapse
|
5
|
Interactions of dopamine, iron, and alpha-synuclein linked to dopaminergic neuron vulnerability in Parkinson's disease and neurodegeneration with brain iron accumulation disorders. Neurobiol Dis 2022; 175:105920. [DOI: 10.1016/j.nbd.2022.105920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 10/21/2022] [Accepted: 11/04/2022] [Indexed: 11/08/2022] Open
|
6
|
Zubelzu M, Morera-Herreras T, Irastorza G, Gómez-Esteban JC, Murueta-Goyena A. Plasma and serum alpha-synuclein as a biomarker in Parkinson's disease: A meta-analysis. Parkinsonism Relat Disord 2022; 99:107-115. [PMID: 35717321 DOI: 10.1016/j.parkreldis.2022.06.001] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 05/18/2022] [Accepted: 06/01/2022] [Indexed: 10/18/2022]
Abstract
BACKGROUND Reliable biomarkers for Parkinson's disease (PD) diagnosis are urgently needed. Alpha-synuclein (α-syn) and its proteoforms play a key role in PD pathology but in vivo measurements have raised conflicting results, and whether α-syn in blood could distinguish PD patients from healthy controls is still controversial. METHODS A systematic literature search yielded 35 eligible studies for meta-analysis reporting the concentration of total, oligomeric or phosphorylated α-syn in plasma and/or serum of PD patients and healthy controls. Standardized mean differences (SMD) were pooled using multivariate/multilevel linear mixed-effects models. Meta-regression analyses were conducted to investigate possible modifiers. RESULTS A meta-analysis of 32 articles involving 2683 PD patients and 1838 controls showed a significant overall effect of PD on total α-syn levels (SMD = 0.85, p = 0.004). Meta-regression showed that increased SMD of total α-syn in PD was significantly associated with lower age, shorter disease duration, mild motor impairment, and Immunomagnetic Reduction assay for protein quantification. In contrast, no significant differences were observed for oligomeric or phosphorylated α-syn between PD and controls but increased oligomeric α-syn was significantly associated with shorter disease duration. The heterogeneity among studies was high (>98%). CONCLUSIONS These findings suggest that increased total plasma/serum α-syn levels in PD primarily occur in early phases of the disease. The evidence obtained from a small number of studies measuring plasma/serum concentrations of oligomeric and phosphorylated species of α-syn shows no difference. The clinical applicability of measuring plasma or serum α-syn species for differentiating PD from healthy control warrants further studies with better clinical profiling of PD patients.
Collapse
Affiliation(s)
- Maider Zubelzu
- Department of Pharmacology, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain; Neurodegenerative Diseases Group, Biocruces Bizkaia Health Research Institute, Barakaldo, Bizkaia, Spain
| | - Teresa Morera-Herreras
- Department of Pharmacology, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain; Neurodegenerative Diseases Group, Biocruces Bizkaia Health Research Institute, Barakaldo, Bizkaia, Spain.
| | - Gorka Irastorza
- Department of Pharmacology, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain
| | - Juan Carlos Gómez-Esteban
- Neurodegenerative Diseases Group, Biocruces Bizkaia Health Research Institute, Barakaldo, Bizkaia, Spain; Department of Neurosciences, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain; Department of Neurology, Cruces University Hospital, Osakidetza, Barakaldo, Bizkaia, Spain
| | - Ane Murueta-Goyena
- Neurodegenerative Diseases Group, Biocruces Bizkaia Health Research Institute, Barakaldo, Bizkaia, Spain; Department of Neurosciences, University of the Basque Country (UPV/EHU), Leioa, Bizkaia, Spain
| |
Collapse
|
7
|
Howe JW, Sortwell CE, Duffy MF, Kemp CJ, Russell CP, Kubik M, Patel P, Luk KC, El-Agnaf OMA, Patterson JR. Preformed fibrils generated from mouse alpha-synuclein produce more inclusion pathology in rats than fibrils generated from rat alpha-synuclein. Parkinsonism Relat Disord 2021; 89:41-47. [PMID: 34218047 DOI: 10.1016/j.parkreldis.2021.06.010] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/31/2020] [Revised: 05/23/2021] [Accepted: 06/15/2021] [Indexed: 11/28/2022]
Abstract
BACKGROUND Alpha-synuclein (α-syn) preformed fibril (PFF)-induced pathology can be used to study the features and progression of synucleinopathies, such as Parkinson's disease. Intrastriatal injection of mouse α-syn PFFs produce accumulation of α-syn pathology in both mice and rats. Previous studies in mice have revealed that greater sequence homology between the α-syn amino acid sequence used to produce PFFs with that of the endogenous host α-syn increases α-syn pathology in vivo. NEW METHODS Based on the prediction that greater sequence homology will result in more α-syn pathology, PFFs generated from recombinant rat α-syn (rPFFs) were used instead of PFFs produced from recombinant mouse α-syn (mPFFs), which are normally used in the model. Rats received unilateral intrastriatal injections of either rPFFs or mPFFs and accumulation of α-syn phosphorylated at serine 129 (pSyn) was examined at 1-month post-surgery. RESULTS Rats injected with mPFFs exhibited abundant accumulation of α-syn inclusions in the substantia nigra and cortical regions, whereas in rats injected with rPFFs had significantly fewer SNpc neurons containing pSyn inclusions (≈60% fewer) and little, if any, pSyn inclusions were observed in the cortex. CONCLUSIONS Our results suggest that additional factors beyond the degree of sequence homology between host α-syn and injected recombinant α-syn impact efficiency of seeding and subsequent inclusion formation. More practically, these findings caution against the use of rPFFs in the rat preformed fibril model.
Collapse
Affiliation(s)
- Jacob W Howe
- Department of Translational Neuroscience, Michigan State University, Grand Rapids, MI, USA; Neuroscience Program, Michigan State University, East Lansing, MI, USA
| | - Caryl E Sortwell
- Department of Translational Neuroscience, Michigan State University, Grand Rapids, MI, USA; Neuroscience Program, Michigan State University, East Lansing, MI, USA; Mercy Health Hauenstein Neuroscience Medical Center, Grand Rapids, MI, USA
| | - Megan F Duffy
- Department of Translational Neuroscience, Michigan State University, Grand Rapids, MI, USA; Neuroscience Program, Michigan State University, East Lansing, MI, USA
| | - Christopher J Kemp
- Department of Translational Neuroscience, Michigan State University, Grand Rapids, MI, USA
| | - Christopher P Russell
- Cell and Molecular Biology Department, Grand Valley State University, Allendale, MI, USA
| | - Michael Kubik
- Department of Translational Neuroscience, Michigan State University, Grand Rapids, MI, USA
| | - Pooja Patel
- Cell and Molecular Biology Department, Grand Valley State University, Allendale, MI, USA
| | - Kelvin C Luk
- Center for Neurodegenerative Disease Research, Department of Pathology and Laboratory Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
| | - Omar M A El-Agnaf
- Neurological Disorders Research Center, Qatar Biomedical Research Institute (QBRI), Hamad Bin Khalifa University (HBKU), Qatar Foundation, Doha, Qatar
| | - Joseph R Patterson
- Department of Translational Neuroscience, Michigan State University, Grand Rapids, MI, USA.
| |
Collapse
|
8
|
Julku UH, Jäntti M, Svarcbahs R, Myöhänen TT. Prolyl Oligopeptidase Regulates Dopamine Transporter Oligomerization and Phosphorylation in a PKC- and ERK-Independent Manner. Int J Mol Sci 2021; 22:1777. [PMID: 33579026 PMCID: PMC7916783 DOI: 10.3390/ijms22041777] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 02/04/2021] [Accepted: 02/05/2021] [Indexed: 12/18/2022] Open
Abstract
Prolyl oligopeptidase (PREP) is a serine protease that binds to alpha-synuclein (aSyn) and induces its aggregation. PREP inhibitors have been shown to have beneficial effects in Parkinson's disease models by enhancing the clearance of aSyn aggregates and modulating striatal dopamine. Additionally, we have shown that PREP regulates phosphorylation and internalization of dopamine transporter (DAT) in mice. In this study, we clarified the mechanism behind this by using HEK-293 and PREP knock-out HEK-293 cells with DAT transfection. We tested the effects of PREP, PREP inhibition, and alpha-synuclein on PREP-related DAT regulation by using Western blot analysis and a dopamine uptake assay, and characterized the impact of PREP on protein kinase C (PKC) and extracellular signal-regulated kinase (ERK) by using PKC assay and Western blot, respectively, as these kinases regulate DAT phosphorylation. Our results confirmed our previous findings that a lack of PREP can increase phosphorylation and internalization of DAT and decrease uptake of dopamine. PREP inhibition had a variable impact on phosphorylation of ERK dependent on the metabolic state of cells, but did not have an effect on phosphorylation or function of DAT. PREP modifications did not affect PKC activity either. Additionally, a lack of PREP elevated a DAT oligomerization that is associated with intracellular trafficking of DAT. Our results suggest that PREP-mediated phosphorylation, oligomerization, and internalization of DAT is not dependent on PKC or ERK.
Collapse
Affiliation(s)
- Ulrika H. Julku
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Viikinkaari 5E (P.O. Box 56), FI-00014 Helsinki, Finland; (U.H.J.); (M.J.); (R.S.)
| | - Maria Jäntti
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Viikinkaari 5E (P.O. Box 56), FI-00014 Helsinki, Finland; (U.H.J.); (M.J.); (R.S.)
| | - Reinis Svarcbahs
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Viikinkaari 5E (P.O. Box 56), FI-00014 Helsinki, Finland; (U.H.J.); (M.J.); (R.S.)
| | - Timo T. Myöhänen
- Division of Pharmacology and Pharmacotherapy/Drug Research Program, Faculty of Pharmacy, University of Helsinki, Viikinkaari 5E (P.O. Box 56), FI-00014 Helsinki, Finland; (U.H.J.); (M.J.); (R.S.)
- Integrative Physiology and Pharmacology Unit/Institute of Biomedicine, Faculty of Medicine, University of Turku, FI-20520 Turku, Finland
| |
Collapse
|
9
|
Limegrover CS, Yurko R, Izzo NJ, LaBarbera KM, Rehak C, Look G, Rishton G, Safferstein H, Catalano SM. Sigma-2 receptor antagonists rescue neuronal dysfunction induced by Parkinson's patient brain-derived α-synuclein. J Neurosci Res 2021; 99:1161-1176. [PMID: 33480104 PMCID: PMC7986605 DOI: 10.1002/jnr.24782] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 12/03/2020] [Accepted: 12/13/2020] [Indexed: 12/11/2022]
Abstract
α‐Synuclein oligomers are thought to have a pivotal role in sporadic and familial Parkinson's disease (PD) and related α‐synucleinopathies, causing dysregulation of protein trafficking, autophagy/lysosomal function, and protein clearance, as well as synaptic function impairment underlying motor and cognitive symptoms of PD. Moreover, trans‐synaptic spread of α‐synuclein oligomers is hypothesized to mediate disease progression. Therapeutic approaches that effectively block α‐synuclein oligomer‐induced pathogenesis are urgently needed. Here, we show for the first time that α‐synuclein species isolated from human PD patient brain and recombinant α‐synuclein oligomers caused similar deficits in lipid vesicle trafficking rates in cultured rat neurons and glia, while α‐synuclein species isolated from non‐PD human control brain samples did not. Recombinant α‐synuclein oligomers also increased neuronal expression of lysosomal‐associated membrane protein‐2A (LAMP‐2A), the lysosomal receptor that has a critical role in chaperone‐mediated autophagy. Unbiased screening of several small molecule libraries (including the NIH Clinical Collection) identified sigma‐2 receptor antagonists as the most effective at blocking α‐synuclein oligomer‐induced trafficking deficits and LAMP‐2A upregulation in a dose‐dependent manner. These results indicate that antagonists of the sigma‐2 receptor complex may alleviate α‐synuclein oligomer‐induced neurotoxicity and are a novel therapeutic approach for disease modification in PD and related α‐synucleinopathies.
Collapse
Affiliation(s)
| | | | | | | | | | - Gary Look
- Cognition Therapeutics Inc., Pittsburgh, PA, USA
| | | | | | | |
Collapse
|
10
|
Bucher ML, Barrett CW, Moon CJ, Mortimer AD, Burton EA, Greenamyre JT, Hastings TG. Acquired dysregulation of dopamine homeostasis reproduces features of Parkinson's disease. NPJ PARKINSONS DISEASE 2020; 6:34. [PMID: 33298952 PMCID: PMC7666186 DOI: 10.1038/s41531-020-00134-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Accepted: 10/08/2020] [Indexed: 12/24/2022]
Abstract
The catecholamine neurotransmitter dopamine has the potential to act as an endogenous neurotoxin when its vesicular sequestration is dysregulated. Despite postmortem analyses from patients with Parkinson’s disease that demonstrate decreased vesicular sequestration of dopamine with a corresponding increase in dopamine metabolism, dopamine’s contribution to nigrostriatal dopaminergic degeneration in Parkinson’s disease has been debated. Here, we present a new in vivo model demonstrating the induction of Parkinson’s disease-associated pathogenic mechanisms of degeneration resulting from acquired dysregulation of dopamine sequestration in nigrostriatal dopaminergic neurons in adult rats. Utilizing adeno-associated virus (serotype 2), viral-mediated small-hairpin RNA interference of endogenous vesicular monoamine transporter 2 (VMAT2) expression resulted in a loss of VMAT2 protein expression in transduced dopaminergic cell bodies in the substantia nigra with a corresponding loss of VMAT2 protein within the striatal terminals. The loss of VMAT2 resulted in an accumulation of cytosolic dopamine and subsequent increased dopamine metabolism, deficits in dopamine-mediated behaviors, and degeneration of nigrostriatal dopaminergic neurons that was rescued through reintroduction of exogenous VMAT2, demonstrating that the toxicity was specific to the loss of VMAT2. Analysis of parkinsonian pathogenic mechanisms of degeneration identified oxidative damage, activation of Parkinson’s disease-associated kinase LRRK2, and the formation of aberrant α-synuclein. This model demonstrates that a progressive acquired loss of VMAT2 expression in adulthood is sufficient to induce Parkinson’s disease-associated pathogenic mechanisms of degeneration and provides a new model to further investigate the consequences of cytosolic dopamine.
Collapse
Affiliation(s)
- Meghan L Bucher
- Pittsburgh Institute for Neurodegenerative Diseases, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.,Department of Neuroscience, University of Pittsburgh School of Arts and Sciences, Pittsburgh, PA, USA.,Department of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Caitlyn W Barrett
- Pittsburgh Institute for Neurodegenerative Diseases, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Connor J Moon
- Pittsburgh Institute for Neurodegenerative Diseases, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.,Department of Neuroscience, University of Pittsburgh School of Arts and Sciences, Pittsburgh, PA, USA
| | - Amanda D Mortimer
- Pittsburgh Institute for Neurodegenerative Diseases, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Edward A Burton
- Pittsburgh Institute for Neurodegenerative Diseases, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA.,Geriatric Research, Education and Clinical Center, Pittsburgh VA Healthcare System, Pittsburgh, PA, USA
| | - J Timothy Greenamyre
- Pittsburgh Institute for Neurodegenerative Diseases, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA
| | - Teresa G Hastings
- Pittsburgh Institute for Neurodegenerative Diseases, University of Pittsburgh, Pittsburgh, PA, USA. .,Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. .,Department of Neuroscience, University of Pittsburgh School of Arts and Sciences, Pittsburgh, PA, USA.
| |
Collapse
|
11
|
Brás IC, Xylaki M, Outeiro TF. Mechanisms of alpha-synuclein toxicity: An update and outlook. PROGRESS IN BRAIN RESEARCH 2019; 252:91-129. [PMID: 32247376 DOI: 10.1016/bs.pbr.2019.10.005] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Alpha-synuclein (aSyn) was identified as the main component of inclusions that define synucleinopathies more than 20 years ago. Since then, aSyn has been extensively studied in an attempt to unravel its roles in both physiology and pathology. Today, studying the mechanisms of aSyn toxicity remains in the limelight, leading to the identification of novel pathways involved in pathogenesis. In this chapter, we address the molecular mechanisms involved in synucleinopathies, from aSyn misfolding and aggregation to the various cellular effects and pathologies associated. In particular, we review our current understanding of the mechanisms involved in the spreading of aSyn between different cells, from the periphery to the brain, and back. Finally, we also review recent studies on the contribution of inflammation and the gut microbiota to pathology in synucleinopathies. Despite significant advances in our understanding of the molecular mechanisms involved, we still lack an integrated understanding of the pathways leading to neurodegeneration in PD and other synucleinopathies, compromising our ability to develop novel therapeutic strategies.
Collapse
Affiliation(s)
- Inês Caldeira Brás
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
| | - Mary Xylaki
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany
| | - Tiago Fleming Outeiro
- Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, University Medical Center Göttingen, Göttingen, Germany; Max Planck Institute for Experimental Medicine, Göttingen, Germany; Institute of Neuroscience, The Medical School, Newcastle University, Newcastle upon Tyne, United Kingdom.
| |
Collapse
|
12
|
SNCA variants and alpha-synuclein level in CD45+ blood cells in Parkinson’s disease. J Neurol Sci 2018; 395:135-140. [DOI: 10.1016/j.jns.2018.10.002] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 08/30/2018] [Accepted: 10/02/2018] [Indexed: 11/23/2022]
|
13
|
Saha S, Khan MA, Mudhara D, Deep S. Tuning the Balance between Fibrillation and Oligomerization of α-Synuclein in the Presence of Dopamine. ACS OMEGA 2018; 3:14213-14224. [PMID: 30411062 PMCID: PMC6217689 DOI: 10.1021/acsomega.8b00993] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Accepted: 10/02/2018] [Indexed: 05/19/2023]
Abstract
The aggregates of α-synuclein bear a close connection with Parkinson's disease, which is largely characterized by the loss of the dopaminergic neurons. Dopamine promotes the formation of undesirable sodium dodecyl sulfate (SDS)-resistant oligomers of α-synuclein. In this study, we have shown that the inhibition of fibrillation by an additive may not always be the ultimate deciding factor in the context of its potential as a successful additive. Copper promotes the fibrillation of α-synuclein in buffer alone but inhibits the formation of SDS-resistant oligomers in the presence of dopamine. Glycerol, on the other hand, increases the population of such dopamine-mediated SDS-resistant oligomers. We speculate such an effect to be a manifestation of the distinct oxidation pathway of dopamine in the presence of copper.
Collapse
|
14
|
Novello S, Arcuri L, Dovero S, Dutheil N, Shimshek DR, Bezard E, Morari M. G2019S LRRK2 mutation facilitates α-synuclein neuropathology in aged mice. Neurobiol Dis 2018; 120:21-33. [PMID: 30172844 DOI: 10.1016/j.nbd.2018.08.018] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2018] [Revised: 08/24/2018] [Accepted: 08/28/2018] [Indexed: 12/20/2022] Open
Abstract
Fibrillization of α-synuclein is instrumental for the development of Parkinson's disease (PD), thus modulating this process can have profound impact on disease initiation/progression. Here, the impact of the p.G2019S mutation of leucine-rich repeat kinase 2 (LRRK2), which is most frequently associated with familial and sporadic PD, on α-synuclein pathology was investigated. G2019S knock-in mice and wild-type controls were injected with a recombinant adeno-associated viral vector serotype 2/9 (AAV2/9) overexpressing human mutant p.A53T α-synuclein (AAV2/9-hα-syn). Control animals were injected with AAV2/9 carrying green fluorescent protein. Motor behavior, transgene expression, α-syn and pSer129 α-syn load, number of nigral dopamine neurons and density of striatal dopaminergic terminals were evaluated. To investigate the effect of aging, experiments were performed in 3- and 12-month-old mice, evaluated 20 and 12 weeks after virus injection, respectively. hα-syn overexpression induced progressive motor deficits, loss of nigral dopaminergic neurons and striatal terminals, and appearance of proteinase K-resistant aggregates of pSer129 α-syn in both young and old mice. Although no genotype difference was observed in 3-month-old mice, degeneration of nigral dopaminergic neurons was higher in 12-month-old G2019S knock-in mice compared with age-matched wild-type controls (-55% vs -39%, respectively). Consistently, a two-fold higher load of pSer129 α-syn aggregates was found in 12-month-old G2019S knock-in mice. We conclude that G2019S LRRK2 facilitates α-synucleinopathy and degeneration of nigral dopaminergic neurons, and that aging is a major determinant of this effect.
Collapse
Affiliation(s)
- Salvatore Novello
- Department of Medical Sciences, Section of Pharmacology, University of Ferrara, National Institute of Neuroscience, Ferrara, Italy
| | - Ludovico Arcuri
- Department of Medical Sciences, Section of Pharmacology, University of Ferrara, National Institute of Neuroscience, Ferrara, Italy
| | - Sandra Dovero
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France; CNRS, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France
| | - Nathalie Dutheil
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France; CNRS, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France
| | - Derya R Shimshek
- Department of Neuroscience, Novartis Institutes for BioMedical Research, Novartis Pharma AG, 4002 Basel, Switzerland
| | - Erwan Bezard
- Université de Bordeaux, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France; CNRS, Institut des Maladies Neurodégénératives, UMR 5293, F-33000 Bordeaux, France
| | - Michele Morari
- Department of Medical Sciences, Section of Pharmacology, University of Ferrara, National Institute of Neuroscience, Ferrara, Italy.
| |
Collapse
|
15
|
α-Synuclein interacts directly but reversibly with psychosine: implications for α-synucleinopathies. Sci Rep 2018; 8:12462. [PMID: 30127535 PMCID: PMC6102231 DOI: 10.1038/s41598-018-30808-9] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Accepted: 08/01/2018] [Indexed: 12/27/2022] Open
Abstract
Aggregation of α-synuclein, the hallmark of α-synucleinopathies such as Parkinson’s disease, occurs in various glycosphingolipidoses. Although α-synuclein aggregation correlates with deficiencies in the lysosomal degradation of glycosphingolipids (GSL), the mechanism(s) involved in this aggregation remains unclear. We previously described the aggregation of α-synuclein in Krabbe’s disease (KD), a neurodegenerative glycosphingolipidosis caused by lysosomal deficiency of galactosyl-ceramidase (GALC) and the accumulation of the GSL psychosine. Here, we used a multi-pronged approach including genetic, biophysical and biochemical techniques to determine the pathogenic contribution, reversibility, and molecular mechanism of aggregation of α-synuclein in KD. While genetic knock-out of α-synuclein reduces, but does not completely prevent, neurological signs in a mouse model of KD, genetic correction of GALC deficiency completely prevents α-synuclein aggregation. We show that psychosine forms hydrophilic clusters and binds the C-terminus of α-synuclein through its amino group and sugar moiety, suggesting that psychosine promotes an open/aggregation-prone conformation of α-synuclein. Dopamine and carbidopa reverse the structural changes of psychosine by mediating a closed/aggregation-resistant conformation of α-synuclein. Our results underscore the therapeutic potential of lysosomal correction and small molecules to reduce neuronal burden in α-synucleinopathies, and provide a mechanistic understanding of α-synuclein aggregation in glycosphingolipidoses.
Collapse
|
16
|
Videira PAQ, Castro-Caldas M. Linking Glycation and Glycosylation With Inflammation and Mitochondrial Dysfunction in Parkinson's Disease. Front Neurosci 2018; 12:381. [PMID: 29930494 PMCID: PMC5999786 DOI: 10.3389/fnins.2018.00381] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2018] [Accepted: 05/18/2018] [Indexed: 01/08/2023] Open
Abstract
Parkinson’s disease (PD) is the second most common neurodegenerative disorder, affecting about 6.3 million people worldwide. PD is characterized by the progressive degeneration of dopaminergic neurons in the Substantia nigra pars compacta, resulting into severe motor symptoms. The cellular mechanisms underlying dopaminergic cell death in PD are still not fully understood, but mitochondrial dysfunction, oxidative stress and inflammation are strongly implicated in the pathogenesis of both familial and sporadic PD cases. Aberrant post-translational modifications, namely glycation and glycosylation, together with age-dependent insufficient endogenous scavengers and quality control systems, lead to cellular overload of dysfunctional proteins. Such injuries accumulate with time and may lead to mitochondrial dysfunction and exacerbated inflammatory responses, culminating in neuronal cell death. Here, we will discuss how PD-linked protein mutations, aging, impaired quality control mechanisms and sugar metabolism lead to up-regulated abnormal post-translational modifications in proteins. Abnormal glycation and glycosylation seem to be more common than previously thought in PD and may underlie mitochondria-induced oxidative stress and inflammation in a feed-forward mechanism. Moreover, the stress-induced post-translational modifications that directly affect parkin and/or its substrates, deeply impairing its ability to regulate mitochondrial dynamics or to suppress inflammation will also be discussed. Together, these represent still unexplored deleterious mechanisms implicated in neurodegeneration in PD, which may be used for a more in-depth knowledge of the pathogenic mechanisms, or as biomarkers of the disease.
Collapse
Affiliation(s)
- Paula A Q Videira
- UCIBIO, Departamento Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Caparica, Portugal.,CDG & Allies - Professionals and Patient Associations International Network (CDG & Allies - PPAIN), Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Caparica, Portugal
| | - Margarida Castro-Caldas
- UCIBIO, Departamento Ciências da Vida, Faculdade de Ciências e Tecnologia, Universidade NOVA de Lisboa, Caparica, Portugal.,Research Institute for Medicines (iMed.ULisboa), Faculty of Pharmacy, Universidade de Lisboa, Lisbon, Portugal
| |
Collapse
|
17
|
Biosa A, Outeiro TF, Bubacco L, Bisaglia M. Diabetes Mellitus as a Risk Factor for Parkinson's Disease: a Molecular Point of View. Mol Neurobiol 2018; 55:8754-8763. [PMID: 29594935 DOI: 10.1007/s12035-018-1025-9] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2017] [Accepted: 03/20/2018] [Indexed: 12/14/2022]
Abstract
Type 2 diabetes mellitus (T2DM) is a metabolic disorder characterized by elevated concentrations of glucose in the blood. The chronic hyperglycemic state accounts for most of the vascular complications associated to the disease and the prevalent mechanism proposed is related to the glycating chemistry mediated by methylglyoxal (MG), which accumulates in T2DM. In recent years, a higher risk of Parkinson's disease (PD) onset in people affected by T2DM has become evident, but the molecular mechanisms underlying the interplay between T2DM and PD are still unknown. The oxidative chemistry of dopamine and its reactivity towards the protein α-Synuclein (aS) has been associated to the pathogenesis of PD. Recently, aS has also been described to interact with MG. Interestingly, MG and the dopamine oxidation products share both structural similarity and chemical reactivity. The ability of MG to spread over the site of its production and react with aS could represent the rationale to explain the higher incidence of PD in T2DM-affected people and may open opportunities for the development of novel strategies to antagonize the raise of PD.
Collapse
Affiliation(s)
- Alice Biosa
- Molecular Physiology and Biophysics Unit, Department of Biology, University of Padova, Padova, Italy
| | - Tiago F Outeiro
- Department of Experimental Neurodegeneration, University Medical Center Goettingen, Goettingen, Germany
- Max Planck Institute for Experimental Medicine, Goettingen, Germany
- Institute of Neuroscience, The Medical School, Newcastle University, Framlington Place, Newcastle Upon Tyne, NE2 4HH, UK
| | - Luigi Bubacco
- Molecular Physiology and Biophysics Unit, Department of Biology, University of Padova, Padova, Italy
| | - Marco Bisaglia
- Molecular Physiology and Biophysics Unit, Department of Biology, University of Padova, Padova, Italy.
| |
Collapse
|
18
|
Post MR, Lieberman OJ, Mosharov EV. Can Interactions Between α-Synuclein, Dopamine and Calcium Explain Selective Neurodegeneration in Parkinson's Disease? Front Neurosci 2018; 12:161. [PMID: 29593491 PMCID: PMC5861202 DOI: 10.3389/fnins.2018.00161] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2017] [Accepted: 02/27/2018] [Indexed: 12/11/2022] Open
Abstract
Several lines of evidence place alpha-synuclein (aSyn) at the center of Parkinson's disease (PD) etiology, but it is still unclear why overexpression or mutated forms of this protein affect some neuronal populations more than others. Susceptible neuronal populations in PD, dopaminergic neurons of the substantia nigra pars compacta (SNpc) and the locus coeruleus (LC), are distinguished by relatively high cytoplasmic concentrations of dopamine and calcium ions. Here we review the evidence for the multi-hit hypothesis of neurodegeneration, including recent papers that demonstrate synergistic interactions between aSyn, calcium ions and dopamine that may lead to imbalanced protein turnover and selective susceptibility of these neurons. We conclude that decreasing the levels of any one of these toxicity mediators can be beneficial for the survival of SNpc and LC neurons, providing multiple opportunities for targeted drug interventions aimed at modifying the course of PD.
Collapse
Affiliation(s)
- Michael R Post
- Departments of Psychiatry and Neurology, New York State Psychiatric Institute, Columbia University Medical Center, New York, NY, United States
| | - Ori J Lieberman
- Departments of Psychiatry and Neurology, New York State Psychiatric Institute, Columbia University Medical Center, New York, NY, United States
| | - Eugene V Mosharov
- Departments of Psychiatry and Neurology, New York State Psychiatric Institute, Columbia University Medical Center, New York, NY, United States
| |
Collapse
|
19
|
Lautenschläger J, Stephens AD, Fusco G, Ströhl F, Curry N, Zacharopoulou M, Michel CH, Laine R, Nespovitaya N, Fantham M, Pinotsi D, Zago W, Fraser P, Tandon A, St George-Hyslop P, Rees E, Phillips JJ, De Simone A, Kaminski CF, Schierle GSK. C-terminal calcium binding of α-synuclein modulates synaptic vesicle interaction. Nat Commun 2018; 9:712. [PMID: 29459792 PMCID: PMC5818535 DOI: 10.1038/s41467-018-03111-4] [Citation(s) in RCA: 199] [Impact Index Per Article: 33.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2017] [Accepted: 01/19/2018] [Indexed: 01/04/2023] Open
Abstract
Alpha-synuclein is known to bind to small unilamellar vesicles (SUVs) via its N terminus, which forms an amphipathic alpha-helix upon membrane interaction. Here we show that calcium binds to the C terminus of alpha-synuclein, therewith increasing its lipid-binding capacity. Using CEST-NMR, we reveal that alpha-synuclein interacts with isolated synaptic vesicles with two regions, the N terminus, already known from studies on SUVs, and additionally via its C terminus, which is regulated by the binding of calcium. Indeed, dSTORM on synaptosomes shows that calcium mediates the localization of alpha-synuclein at the pre-synaptic terminal, and an imbalance in calcium or alpha-synuclein can cause synaptic vesicle clustering, as seen ex vivo and in vitro. This study provides a new view on the binding of alpha-synuclein to synaptic vesicles, which might also affect our understanding of synucleinopathies.
Collapse
Affiliation(s)
- Janin Lautenschläger
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Amberley D Stephens
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Giuliana Fusco
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Florian Ströhl
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Nathan Curry
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Maria Zacharopoulou
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Claire H Michel
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Romain Laine
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Nadezhda Nespovitaya
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Marcus Fantham
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Dorothea Pinotsi
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
- Scientific Center for Optical and Electron Microscopy, ETH Zurich, Otto-Stern Weg 3, CH8093, Zurich, Switzerland
| | - Wagner Zago
- Prothena Biosciences Inc, South San Francisco, CA, 94080, USA
| | - Paul Fraser
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, ON, M5T 2S8, Canada
| | - Anurag Tandon
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, ON, M5T 2S8, Canada
| | - Peter St George-Hyslop
- Tanz Centre for Research in Neurodegenerative Diseases, University of Toronto, Toronto, ON, M5T 2S8, Canada
- Department of Clinical Neurosciences, Cambridge Institute for Medical Research, University of Cambridge, Cambridge, CB2 0XY, UK
| | - Eric Rees
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Jonathan J Phillips
- Department of Biosciences, Living Systems Institute, University of Exeter, Exeter, EX4 4QD, UK
| | - Alfonso De Simone
- Department of Life Sciences, Imperial College London, London, SW7 2AZ, UK
| | - Clemens F Kaminski
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK
| | - Gabriele S Kaminski Schierle
- Department of Chemical Engineering and Biotechnology, University of Cambridge, West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0AS, UK.
| |
Collapse
|
20
|
Olesen MN, Christiansen JR, Petersen SV, Jensen PH, Paslawski W, Romero-Ramos M, Sanchez-Guajardo V. CD4 T cells react to local increase of α-synuclein in a pathology-associated variant-dependent manner and modify brain microglia in absence of brain pathology. Heliyon 2018; 4:e00513. [PMID: 29560431 PMCID: PMC5857520 DOI: 10.1016/j.heliyon.2018.e00513] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2017] [Revised: 01/03/2018] [Accepted: 01/11/2018] [Indexed: 12/31/2022] Open
Abstract
We have previously shown that immunological processes in the brain during α-synuclein-induced neurodegeneration vary depending on the presence or absence of cell death. This suggests that the immune system is able to react differently to the different stages of α-synuclein pathology. However, it was unclear whether these immune changes were governed by brain processes or by a direct immune response to α-synuclein modifications. We have herein locally increased the peripheral concentration of α-synuclein or its pathology-associated variants, nitrated or fibrillar, to characterize the modulation of the CD4 T cell pool by α-synuclein and brain microglia in the absence of any α-synuclein brain pathology. We observed that α-synuclein changed the CD4:CD8 ratio by contracting the CD3+CD4+ T cell pool and reducing the pool of memory Regulatory T cells (Treg). Nitrated α-synuclein induced the expansion of both the CD3+CD4+ and CD3+CD4- T cells, while fibrils increased the percentage of Foxp3+ Treg cells and induced anti-α-synuclein antibodies. Furthermore, the activation pattern of CD3+CD4+ T cells was modulated in a variant-dependent manner; while nitrated and fibrillar α-synuclein expanded the fraction of activated Treg, all three α-synuclein variants reduced the expression levels of STAT3, CD25 and CD127 on CD3+CD4+ T cells. Additionally, while monomeric α-synuclein increased CD103 expression, the fibrils decreased it, and CCR6 expression was decreased by nitrated and fibrillar α-synuclein, indicating that α-synuclein variants affect the homing and tolerance capacities of CD3+CD4+ T cells. Indeed, this correlated with changes in brain microglia phenotype, as determined by FACS analysis, in an α-synuclein variant-specific manner and coincided in time with CD4+ T cell infiltration into brain parenchyma. We have shown that the peripheral immune system is able to sense and react specifically to changes in the local concentration and structure of α-synuclein, which results in variant-specific T cell migration into the brain. This may have a specific repercussion for brain microglia.
Collapse
Affiliation(s)
- Mads N Olesen
- Neuroimmunology of Degenerative Diseases Group, Department of Biomedicine, Aarhus University, Aarhus, Denmark.,AUideas Pilot Center NEURODIN, Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Josefine R Christiansen
- Neuroimmunology of Degenerative Diseases Group, Department of Biomedicine, Aarhus University, Aarhus, Denmark.,AUideas Pilot Center NEURODIN, Department of Biomedicine, Aarhus University, Aarhus, Denmark.,CNS Disease Modeling Group, Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Steen Vang Petersen
- Laboratory for Redox Regulation, Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | | | - Wojciech Paslawski
- iNANO, Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Marina Romero-Ramos
- AUideas Pilot Center NEURODIN, Department of Biomedicine, Aarhus University, Aarhus, Denmark.,CNS Disease Modeling Group, Department of Biomedicine, Aarhus University, Aarhus, Denmark
| | - Vanesa Sanchez-Guajardo
- Neuroimmunology of Degenerative Diseases Group, Department of Biomedicine, Aarhus University, Aarhus, Denmark.,AUideas Pilot Center NEURODIN, Department of Biomedicine, Aarhus University, Aarhus, Denmark
| |
Collapse
|
21
|
Arshad AR, Sulaiman SA, Saperi AA, Jamal R, Mohamed Ibrahim N, Abdul Murad NA. MicroRNAs and Target Genes As Biomarkers for the Diagnosis of Early Onset of Parkinson Disease. Front Mol Neurosci 2017; 10:352. [PMID: 29163029 PMCID: PMC5671573 DOI: 10.3389/fnmol.2017.00352] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Accepted: 10/13/2017] [Indexed: 12/21/2022] Open
Abstract
Among the neurodegenerative disorders, Parkinson's disease (PD) ranks as the second most common disorder with a higher prevalence in individuals aged over 60 years old. Younger individuals may also be affected with PD which is known as early onset PD (EOPD). Despite similarities between the characteristics of EOPD and late onset PD (LODP), EOPD patients experience much longer disease manifestations and poorer quality of life. Although some individuals are more prone to have EOPD due to certain genetic alterations, the molecular mechanisms that differentiate between EOPD and LOPD remains unclear. Recent findings in PD patients revealed that there were differences in the genetic profiles of PD patients compared to healthy controls, as well as between EOPD and LOPD patients. There were variants identified that correlated with the decline of cognitive and motor symptoms as well as non-motor symptoms in PD. There were also specific microRNAs that correlated with PD progression, and since microRNAs have been shown to be involved in the maintenance of neuronal development, mitochondrial dysfunction and oxidative stress, there is a strong possibility that these microRNAs can be potentially used to differentiate between subsets of PD patients. PD is mainly diagnosed at the late stage, when almost majority of the dopaminergic neurons are lost. Therefore, identification of molecular biomarkers for early detection of PD is important. Given that miRNAs are crucial in controlling the gene expression, these regulatory microRNAs and their target genes could be used as biomarkers for early diagnosis of PD. In this article, we discussed the genes involved and their regulatory miRNAs, regarding their roles in PD progression, based on the findings of significantly altered microRNAs in EOPD studies. We also discussed the potential of these miRNAs as molecular biomarkers for early diagnosis.
Collapse
Affiliation(s)
- Ahmad R. Arshad
- UKM Medical Centre, UKM Medical Molecular Biology Institute, Universiti Kebangsaan Malaysia, Bandar Tun Razak, Malaysia
| | - Siti A. Sulaiman
- UKM Medical Centre, UKM Medical Molecular Biology Institute, Universiti Kebangsaan Malaysia, Bandar Tun Razak, Malaysia
| | - Amalia A. Saperi
- UKM Medical Centre, UKM Medical Molecular Biology Institute, Universiti Kebangsaan Malaysia, Bandar Tun Razak, Malaysia
| | - Rahman Jamal
- UKM Medical Centre, UKM Medical Molecular Biology Institute, Universiti Kebangsaan Malaysia, Bandar Tun Razak, Malaysia
| | - Norlinah Mohamed Ibrahim
- Department of Medicine, Faculty of Medicine, UKM Medical Centre, Universiti Kebangsaan Malaysia, Bandar Tun Razak, Malaysia
| | - Nor Azian Abdul Murad
- UKM Medical Centre, UKM Medical Molecular Biology Institute, Universiti Kebangsaan Malaysia, Bandar Tun Razak, Malaysia
| |
Collapse
|
22
|
Izumi Y, Kondo N, Takahashi R, Akaike A, Kume T. Reduction of Immunoreactivity Against the C-Terminal Region of the Intracellular α-Synuclein by Exogenous α-Synuclein Aggregates: Possibility of Conformational Changes. JOURNAL OF PARKINSONS DISEASE 2017; 6:569-79. [PMID: 27314756 DOI: 10.3233/jpd-160835] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
BACKGROUND The formation of intracellular aggregates containing α-synuclein (α-syn) is a main pathological feature of Parkinson disease. The propagation of α-syn aggregation via cell-to-cell transmission has been implicated in the progression of Parkinson disease. OBJECTIVE Our aim is to clarify the molecular mechanisms underlying the formation of intracellular aggregation by extracellular α-syn. METHODS We investigated the effects of exogenous α-syn aggregates on intracellular α-syn immunoreactivity in α-syn-overexpressing SH-SY5Y cells using two antibodies to distinct epitopes of α-syn. To obtain α-syn aggregates, α-syn solution was aged with continuous agitation. RESULTS Immunoreactivity against the acidic C-terminal domain of the intracellular α-syn was reduced by exposure to agedα-syn, whereas that against the hydrophobic non-amyloid component region was not changed. The reduction in immunoreactivity was not suppressed by protease inhibitors but was mimicked by neutralization of the negative charges on the C-terminal of the intracellular α-syn induced by spermine or extracellular acidification. CONCLUSIONS These results suggest that the reduction in immunoreactivity is attributed not to proteolytic cleavage but to a conformational change at the C-terminus of the intracellular α-syn. The conformational change at the C-terminus of the intracellular α-syn might be involved in an initial step of fibril formation by exogenous α-syn aggregates.
Collapse
Affiliation(s)
- Yasuhiko Izumi
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, Japan
| | - Naoto Kondo
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, Japan
| | - Ryosuke Takahashi
- Department of Neurology, Graduate School of Medicine, Kyoto University, Shogoin, Sakyo-ku, Kyoto, Japan
| | - Akinori Akaike
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, Japan.,Department of Cellular Pharmacology, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Japan
| | - Toshiaki Kume
- Department of Pharmacology, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto, Japan
| |
Collapse
|
23
|
Bellucci A, Antonini A, Pizzi M, Spano P. The End Is the Beginning: Parkinson's Disease in the Light of Brain Imaging. Front Aging Neurosci 2017; 9:330. [PMID: 29066967 PMCID: PMC5641408 DOI: 10.3389/fnagi.2017.00330] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 09/25/2017] [Indexed: 01/15/2023] Open
Abstract
Parkinson's disease (PD), the most common neurodegenerative disorder, is characterized by abnormal accumulation of α-synuclein aggregates known as Lewy bodies (LB) and loss of nigrostriatal dopaminergic neurons. Recent neuroimaging studies suggest that in the early phases of PD, synaptic and axonal damage anticipate the onset of a frank neuronal death. Paralleling, even post mortem studies on the brain of affected patients and on animal models support that synapses might represent the primary sites of functional and pathological changes. Indeed, α-synuclein microaggregation and spreading at terminals, by dysregulating the synaptic junction, would block neurotransmitter release, thus triggering a retrograde neurodegenerative process ending with neuronal cell loss by proceeding through the axons. Rather than neurodegeneration, loss of dopaminergic neuronal endings and axons could thus underlie the onset of connectome dysfunction and symptoms in PD and parkinsonisms. However, the manifold biases deriving from the interpretation of human brain imaging data hinder the validation of this hypothesis. Here, we present pivotal evidence supporting that novel comparative brain imaging studies, in patients and experimental models of PD in preliminary stages of disease, could be instrumental for proving whether synaptic endings are the sites where degeneration begins and initiating the factual achievement of disease modifying approaches. The need for such investigations is timely to define an early therapeutic window of intervention to attempt disease halting by terminal and/or axonal healing.
Collapse
Affiliation(s)
- Arianna Bellucci
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy.,Laboratory of Preventive and Personalized Medicine, University of Brescia, Brescia, Italy
| | - Angelo Antonini
- Department of Neurosciences, University of Padova, Padova, Italy.,Istituto Di Ricovero e Cura a Carattere Scientifico (IRCCS) San Camillo, Venezia, Italy
| | - Marina Pizzi
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy
| | - PierFranco Spano
- Department of Molecular and Translational Medicine, University of Brescia, Brescia, Italy.,Istituto Di Ricovero e Cura a Carattere Scientifico (IRCCS) San Camillo, Venezia, Italy
| |
Collapse
|
24
|
Autophagy enhancement is rendered ineffective in presence of α-synuclein in melanoma cells. J Cell Commun Signal 2017; 11:381-394. [PMID: 28748508 DOI: 10.1007/s12079-017-0402-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2017] [Accepted: 07/13/2017] [Indexed: 10/19/2022] Open
Abstract
Increased cellular concentration of α-synuclein (α-syn) predisposes it to misfolding and aggregation that in turn impair the degradation pathways. This poses a limitation to the use of overexpression models for studies on α-syn clearance by autophagy, which is widely investigated for its therapeutic potential. This limitation can be overcome with the use of endogenous models. In this study, SK-MEL-28, a melanoma cell model with endogenous α-syn expression, was employed to study α-syn clearance through autophagy. We demonstrated the dual localization of α-syn to nucleus and cytoplasm that varied in response to changes in cellular environment. Autophagy inhibition and exposure to dopamine favored cytoplasmic localization of α-syn, while autophagy induction favored increased localization to the nucleus. The inhibitory effect of dopamine on autophagy was heightened in presence of α-syn. Additionally, because α-syn had a regulatory effect on autophagy, cells showed an increased resistance to autophagy induction in presence of α-syn. This resistance prevented effective induction of autophagy even under conditions of prolonged autophagy inhibition. These results highlight alternate physiological roles of α-syn, particularly in non-neuronal cells. Because autophagy enhancement could reverse neither the increase in α-syn levels nor the autophagy inhibition, there arises a need to evaluate the efficacy of autophagy-based therapeutic strategies.
Collapse
|
25
|
Song J, Kim BC, Nguyen DTT, Samidurai M, Choi SM. Levodopa (L-DOPA) attenuates endoplasmic reticulum stress response and cell death signaling through DRD2 in SH-SY5Y neuronal cells under α-synuclein-induced toxicity. Neuroscience 2017; 358:336-348. [PMID: 28687316 DOI: 10.1016/j.neuroscience.2017.06.060] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 06/16/2017] [Accepted: 06/28/2017] [Indexed: 12/30/2022]
Abstract
Parkinson's disease (PD) is characterized by the formation of Lewy bodies (LBs) in dopaminergic neurons. α-Synuclein (α-syn), a major protein component of LBs, is known to regulate synaptic plasticity, with a crucial role in memory and motor function in the central nervous system. Levodopa (L-3,4-dihydroxyphenylalanine; also known as L-DOPA) is considered the most effective medication for controlling the symptoms of PD. However, it is unclear whether L-DOPA improves the neuropathology of PD. In the present study, we investigated the effect of L-DOPA on SH-SY5Y neuronal cells under α-syn-induced toxicity. We assessed the protein and mRNA levels of endoplasmic reticulum (ER) stress and cell death markers using western blot analysis and reverse transcription-PCR. Our data showed that L-DOPA could attenuate ER stress markers, including the levels of activating transcription factor 4 (ATF4), C/EBPhomologous protein expression (CHOP), immunoglobulin-heavy-chain-binding protein (BiP), sliced X-box-binding protein 1 (XBP-1), and reduce nuclear factor kappa-light-chain-enhancer of activated B cells (NF-κB) signaling through dopamine receptor D2 (DRD2) in SH-SY5Y neuronal cells under α-syn-induced toxicity. In conclusion, we suggest that L-DOPA may attenuate the neuropathology of PD by regulating signaling related to DRD2 in neuronal cells under α-syn-induced toxicity. Our study, therefore, indicates an additional role for L-DOPA in the treatment of PD.
Collapse
Affiliation(s)
- Juhyun Song
- Department of Biomedical Sciences, Center for Creative Biomedical Scientists at Chonnam National University, Gwangju 61469, South Korea.
| | - Byeong C Kim
- Department of Neurology, Chonnam National University Medical School, Gwangju 61469, South Korea.
| | - Dai-Trang T Nguyen
- Department of Biomedical Sciences, Center for Creative Biomedical Scientists at Chonnam National University, Gwangju 61469, South Korea.
| | - Manikandan Samidurai
- Department of Biomedical Sciences, Center for Creative Biomedical Scientists at Chonnam National University, Gwangju 61469, South Korea.
| | - Seong-Min Choi
- Department of Neurology, Chonnam National University Medical School, Gwangju 61469, South Korea.
| |
Collapse
|
26
|
DOPAL derived alpha-synuclein oligomers impair synaptic vesicles physiological function. Sci Rep 2017; 7:40699. [PMID: 28084443 PMCID: PMC5233976 DOI: 10.1038/srep40699] [Citation(s) in RCA: 98] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Accepted: 12/06/2016] [Indexed: 12/15/2022] Open
Abstract
Parkinson’s disease is a neurodegenerative disorder characterized by the death of dopaminergic neurons and by accumulation of alpha-synuclein (aS) aggregates in the surviving neurons. The dopamine catabolite 3,4-dihydroxyphenylacetaldehyde (DOPAL) is a highly reactive and toxic molecule that leads to aS oligomerization by covalent modifications to lysine residues. Here we show that DOPAL-induced aS oligomer formation in neurons is associated with damage of synaptic vesicles, and with alterations in the synaptic vesicles pools. To investigate the molecular mechanism that leads to synaptic impairment, we first aimed to characterize the biochemical and biophysical properties of the aS-DOPAL oligomers; heterogeneous ensembles of macromolecules able to permeabilise cholesterol-containing lipid membranes. aS-DOPAL oligomers can induce dopamine leak in an in vitro model of synaptic vesicles and in cellular models. The dopamine released, after conversion to DOPAL in the cytoplasm, could trigger a noxious cycle that further fuels the formation of aS-DOPAL oligomers, inducing neurodegeneration.
Collapse
|
27
|
Christiansen JR, Olesen MN, Otzen DE, Romero-Ramos M, Sanchez-Guajardo V. α-Synuclein vaccination modulates regulatory T cell activation and microglia in the absence of brain pathology. J Neuroinflammation 2016; 13:74. [PMID: 27055651 PMCID: PMC4825077 DOI: 10.1186/s12974-016-0532-8] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2015] [Accepted: 03/18/2016] [Indexed: 12/22/2022] Open
Abstract
Background Passive and active immunization with α-synuclein has been shown to be neuroprotective in animal models of Parkinson’s disease. We have previously shown that vaccination with α-synuclein, long before α-synuclein-induced brain pathology, prevents striatal degeneration by inducing regulatory T cell infiltration in parenchyma and antibody deposition on α-synuclein overexpressing neurons. However, the effect of peripheral α-synuclein on the immune system is unknown, as are the mechanistic changes induced in the CD4 T cell population during successful neuroprotective animal studies. We have studied the changes induced by vaccination with α-synuclein in the CD4 T cell pool and its impact on brain microglia to understand the immune mechanisms behind successful vaccination strategies in Parkinson’s disease animal models. Methods Mice were immunized with WT or nitrated α-synuclein at a dose equivalent to the one used in our previous successful vaccination strategy and at a higher dose to determine potential dose-dependent effects. Animals were re-vaccinated 4 weeks after and sacrificed 5 days later. These studies were conducted in naive animals in the absence of human α-synuclein expression. Results The CD4 T cell response was modulated by α-synuclein in a dose-dependent manner, in particular the regulatory T cell population. Low-dose α-synuclein induced expansion of naive (Foxp3 + CCR6-CD127lo/neg) and dopamine receptor type D3+ regulatory T cells, as well as an increase in Stat5 protein levels. On the other hand, high dose promoted activation of regulatory T cells (Foxp3CCR6 + CD127lo/neg), which were dopamine receptor D2+D3-, and induced up-regulation of Stat5 and production of anti-α-synuclein antibodies. These effects were specific to the variant of α-synuclein used as the pathology-associated nitrated form induced distinct effects at both doses. The changes observed in the periphery after vaccination with low-dose α-synuclein correlated with an increase in CD154+, CD103+, and CD54+ microglia and the reduction of CD200R+ microglia. This resulted in the induction of a polarized tolerogenic microglia population that was CD200R-CD54CD103CD172a+ (82 % of total microglia). Conclusions We have shown for the first time the mechanisms behind α-synuclein vaccination and, importantly, how we can modulate microglia’s phenotype by regulating the CD4 T cell pool, thus shedding invaluable light on the design of neuroimmunoregulatory therapies for Parkinson’s disease. Electronic supplementary material The online version of this article (doi:10.1186/s12974-016-0532-8) contains supplementary material, which is available to authorized users.
Collapse
Affiliation(s)
- Josefine R Christiansen
- Neuroimmunology of Degenerative Diseases group, Department of Biomedicine, HEALTH, Aarhus University, Aarhus, Denmark.,CNS Disease Modeling group, Department of Biomedicine, HEALTH , Aarhus University, Aarhus, Denmark.,AU Ideas Pilot Center NEURODIN, Department of Biomedicine, HEALTH, Aarhus University, Aarhus, Denmark
| | - Mads N Olesen
- Neuroimmunology of Degenerative Diseases group, Department of Biomedicine, HEALTH, Aarhus University, Aarhus, Denmark.,AU Ideas Pilot Center NEURODIN, Department of Biomedicine, HEALTH, Aarhus University, Aarhus, Denmark
| | - Daniel E Otzen
- Interdisciplinary Nanoscience Center - iNANO, Department of Molecular Biology and Genetics, Aarhus University, Aarhus, Denmark
| | - Marina Romero-Ramos
- CNS Disease Modeling group, Department of Biomedicine, HEALTH , Aarhus University, Aarhus, Denmark.,AU Ideas Pilot Center NEURODIN, Department of Biomedicine, HEALTH, Aarhus University, Aarhus, Denmark
| | - Vanesa Sanchez-Guajardo
- Neuroimmunology of Degenerative Diseases group, Department of Biomedicine, HEALTH, Aarhus University, Aarhus, Denmark. .,AU Ideas Pilot Center NEURODIN, Department of Biomedicine, HEALTH, Aarhus University, Aarhus, Denmark.
| |
Collapse
|
28
|
Nuber S, Tadros D, Fields J, Overk CR, Ettle B, Kosberg K, Mante M, Rockenstein E, Trejo M, Masliah E. Environmental neurotoxic challenge of conditional alpha-synuclein transgenic mice predicts a dopaminergic olfactory-striatal interplay in early PD. Acta Neuropathol 2014; 127:477-94. [PMID: 24509835 DOI: 10.1007/s00401-014-1255-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2013] [Revised: 01/31/2014] [Accepted: 02/01/2014] [Indexed: 12/17/2022]
Abstract
The olfactory bulb (OB) is one of the first brain regions in Parkinson's disease (PD) to contain alpha-synuclein (α-syn) inclusions, possibly associated with nonmotor symptoms. Mechanisms underlying olfactory synucleinopathy, its contribution to progressive aggregation pathology and nigrostriatal dopaminergic loss observed at later stages, remain unclear. A second hit, such as environmental toxins, is suggestive for α-syn aggregation in olfactory neurons, potentially triggering disease progression. To address the possible pathogenic role of olfactory α-syn accumulation in early PD, we exposed mice with site-specific and inducible overexpression of familial PD-linked mutant α-syn in OB neurons to a low dose of the herbicide paraquat. Here, we found that olfactory α-syn per se elicited structural and behavioral abnormalities, characteristic of an early time point in models with widespread α-syn expression, including hyperactivity and increased striatal dopaminergic marker. Suppression of α-syn reversed the dopaminergic phenotype. In contrast, paraquat treatment synergistically induced degeneration of olfactory dopaminergic cells and opposed the higher reactive phenotype. Neither neurodegeneration nor behavioral abnormalities were detected in paraquat-treated mice with suppressed α-syn expression. By increasing calpain activity, paraquat induced a pathological cascade leading to inhibition of autophagy clearance and accumulation of calpain-cleaved truncated and insoluble α-syn, recapitulating biochemical and structural changes in human PD. Thus our results underscore the primary role of proteolytic failure in aggregation pathology. In addition, we provide novel evidence that olfactory dopaminergic neurons display an increased vulnerability toward neurotoxins in dependence to presence of human α-syn, possibly mediating an olfactory-striatal dopaminergic network dysfunction in mouse models and early PD.
Collapse
Affiliation(s)
- Silke Nuber
- Department of Neurosciences, University of California San Diego, 9500 Gilman Dr., MTF 344, La Jolla, CA, 92093-0624, USA,
| | | | | | | | | | | | | | | | | | | |
Collapse
|
29
|
Dibenedetto D, Rossetti G, Caliandro R, Carloni P. A Molecular Dynamics Simulation-Based Interpretation of Nuclear Magnetic Resonance Multidimensional Heteronuclear Spectra of α-Synuclein·Dopamine Adducts. Biochemistry 2013; 52:6672-83. [DOI: 10.1021/bi400367r] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Domenica Dibenedetto
- Computational Biophysics,
German Research School for Simulation Sciences (joint
venture of RWTH Aachen University and Forschungszentrum Jülich), D-52425 Jülich, Germany, and Institute for Advanced Simulation IAS-5, Computational
Biomedicine, Forschungszentrum Jülich, D-52425 Jülich, Germany
| | - Giulia Rossetti
- Computational Biophysics,
German Research School for Simulation Sciences (joint
venture of RWTH Aachen University and Forschungszentrum Jülich), D-52425 Jülich, Germany, and Institute for Advanced Simulation IAS-5, Computational
Biomedicine, Forschungszentrum Jülich, D-52425 Jülich, Germany
- Institute for Research in Biomedicine (IRB Barcelona), Baldiri Reixac 10, Barcelona 08028, Spain
- Joint IRB-BSC Program in Computational Biology, Barcelona, Spain
- John
von Neumann Institute for Computing (JSC), Forschungszentrum Jülich, Jülich, Germany
| | - Rocco Caliandro
- Institute
of Crystallography (IC), National Research Council of Italy (CNR), via Amendola, 122/o, 70126 Bari, Italy
| | - Paolo Carloni
- Computational Biophysics,
German Research School for Simulation Sciences (joint
venture of RWTH Aachen University and Forschungszentrum Jülich), D-52425 Jülich, Germany, and Institute for Advanced Simulation IAS-5, Computational
Biomedicine, Forschungszentrum Jülich, D-52425 Jülich, Germany
| |
Collapse
|
30
|
Illes-Toth E, Dalton CF, Smith DP. Binding of Dopamine to Alpha-Synuclein is Mediated by Specific Conformational States. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2013; 24:1346-54. [PMID: 23817832 PMCID: PMC3738842 DOI: 10.1007/s13361-013-0676-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2013] [Revised: 05/08/2013] [Accepted: 05/09/2013] [Indexed: 05/11/2023]
Abstract
Parkinson's disease is the second most common neurodegenerative disorder, in which both alpha-synuclein (α-syn) and dopamine (DA) have a critical role. α-Syn is known to be natively unstructured in equilibrium with subpopulations of more compact structures. It is these compact structures that are thought to be linked to amyloid formation. In the presence of DA, α-syn yields a diverse range of SDS-resistant, non-amyloid oligomers, however the precursor state conformation has not been established. Here, three DA molecules have been observed to bind per α-syn monomer by electrospray-ionization-ion mobility spectrometry-mass spectrometry (ESI-IMS-MS). Each of these DA molecules binds exclusively to the extended conformation of α-syn, and binding is not observed in the compact state of the protein. Measurements of collisional cross sectional areas show that the incremental uptake of DA pushes the protein towards a highly extended population, becoming fully populated upon the binding of three DA ligands. Tyrosine (Tyr) as a closely related structural analog, exhibited limited binding to the protein as compared with DA, with a maximum of two ligands being observed. Those Tyr ligands that do bind were observed as adducts to the extended conformation akin to DA. These findings suggest DA is able to modulate α-syn self-assembly by inducing the population of a highly extended state.
Collapse
Affiliation(s)
- Eva Illes-Toth
- Biomedical Research Centre, Sheffield Hallam University, Sheffield, S1 1WB United Kingdom
| | - Caroline F. Dalton
- Biomedical Research Centre, Sheffield Hallam University, Sheffield, S1 1WB United Kingdom
| | - David P. Smith
- Biomedical Research Centre, Sheffield Hallam University, Sheffield, S1 1WB United Kingdom
| |
Collapse
|
31
|
Faria C, Jorge CD, Borges N, Tenreiro S, Outeiro TF, Santos H. Inhibition of formation of α-synuclein inclusions by mannosylglycerate in a yeast model of Parkinson's disease. Biochim Biophys Acta Gen Subj 2013; 1830:4065-72. [DOI: 10.1016/j.bbagen.2013.04.015] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2012] [Revised: 04/09/2013] [Accepted: 04/12/2013] [Indexed: 10/26/2022]
|
32
|
Danzer KM, McLean PJ. Drug targets from genetics: α-synuclein. CNS & NEUROLOGICAL DISORDERS-DRUG TARGETS 2013; 10:712-23. [PMID: 21838671 DOI: 10.2174/187152711797247867] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/01/2010] [Revised: 07/22/2011] [Accepted: 07/24/2011] [Indexed: 02/08/2023]
Abstract
One of the critical issues in Parkinson disease (PD) research is the identity of the specific toxic, pathogenic moiety. In PD, mutations in α-synuclein (αsyn) or multiplication of the SNCA gene encoding αsyn, result in a phenotype of cellular inclusions, cell death, and brain dysfunction. While the historical point of view has been that the macroscopic aggregates containing αsyn are the toxic species, in the last several years evidence has emerged that suggests instead that smaller soluble species--likely oligomers containing misfolded αsyn--are actually the toxic moiety and that the fibrillar inclusions may even be a cellular detoxification pathway and less harmful. If soluble misfolded species of αsyn are the toxic moieties, then cellular mechanisms that degrade misfolded αsyn would be neuroprotective and a rational target for drug development. In this review we will discuss the fundamental mechanisms underlying αsyn toxicity including oligomer formation, oxidative stress, and degradation pathways and consider rational therapeutic strategies that may have the potential to prevent or halt αsyn induced pathogenesis in PD.
Collapse
Affiliation(s)
- Karin M Danzer
- MassGeneral Institute for Neurodegenerative Disease, Department of Neurology, Massachusetts General Hospital, Harvard Medical School, Charlestown, 02129, USA
| | | |
Collapse
|
33
|
Xiang W, Schlachetzki JC, Helling S, Bussmann JC, Berlinghof M, Schäffer TE, Marcus K, Winkler J, Klucken J, Becker CM. Oxidative stress-induced posttranslational modifications of alpha-synuclein: Specific modification of alpha-synuclein by 4-hydroxy-2-nonenal increases dopaminergic toxicity. Mol Cell Neurosci 2013; 54:71-83. [DOI: 10.1016/j.mcn.2013.01.004] [Citation(s) in RCA: 115] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2012] [Revised: 12/28/2012] [Accepted: 01/19/2013] [Indexed: 01/24/2023] Open
|
34
|
Carter CJ. Toxoplasmosis and Polygenic Disease Susceptibility Genes: Extensive Toxoplasma gondii Host/Pathogen Interactome Enrichment in Nine Psychiatric or Neurological Disorders. J Pathog 2013; 2013:965046. [PMID: 23533776 PMCID: PMC3603208 DOI: 10.1155/2013/965046] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2012] [Revised: 08/18/2012] [Accepted: 09/10/2012] [Indexed: 01/04/2023] Open
Abstract
Toxoplasma gondii is not only implicated in schizophrenia and related disorders, but also in Alzheimer's or Parkinson's disease, cancer, cardiac myopathies, and autoimmune disorders. During its life cycle, the pathogen interacts with ~3000 host genes or proteins. Susceptibility genes for multiple sclerosis, Alzheimer's disease, schizophrenia, bipolar disorder, depression, childhood obesity, Parkinson's disease, attention deficit hyperactivity disorder (P from 8.01E - 05 (ADHD) to 1.22E - 71) (multiple sclerosis), and autism (P = 0.013), but not anorexia or chronic fatigue are highly enriched in the human arm of this interactome and 18 (ADHD) to 33% (MS) of the susceptibility genes relate to it. The signalling pathways involved in the susceptibility gene/interactome overlaps are relatively specific and relevant to each disease suggesting a means whereby susceptibility genes could orient the attentions of a single pathogen towards disruption of the specific pathways that together contribute (positively or negatively) to the endophenotypes of different diseases. Conditional protein knockdown, orchestrated by T. gondii proteins or antibodies binding to those of the host (pathogen derived autoimmunity) and metabolite exchange, may contribute to this disruption. Susceptibility genes may thus be related to the causes and influencers of disease, rather than (and as well as) to the disease itself.
Collapse
Affiliation(s)
- C. J. Carter
- Polygenic Pathways, Flat 2, 40 Baldslow Road, Hastings, East Sussex TN34 2EY, UK
| |
Collapse
|
35
|
Gonçalves S, Outeiro TF. Assessing the subcellular dynamics of alpha-synuclein using photoactivation microscopy. Mol Neurobiol 2013; 47:1081-92. [PMID: 23389286 PMCID: PMC3637893 DOI: 10.1007/s12035-013-8406-x] [Citation(s) in RCA: 59] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 01/08/2013] [Indexed: 11/27/2022]
Abstract
Alpha-synuclein (aSyn) is implicated in Parkinson’s disease and several other neurodegenerative disorders. To date, the function and intracellular dynamics of aSyn are still unclear. Here, we tracked the dynamics of aSyn using photoactivatable green fluorescent protein as a reporter. We found that the availability of the aSyn N terminus modulates its shuttling into the nucleus. Interestingly, familial aSyn mutations altered the dynamics at which the protein distributes throughout the cell. Both the A30P and A53T aSyn mutations increase the speed at which the protein moves between the nucleus and cytoplasm, respectively. We also found that specific kinases potentiate the shuttling of aSyn between nucleus and cytoplasm. A mutant aSyn form that blocks S129 phosphorylation, S129A, results in the formation of cytoplasmic inclusions, suggesting phosphorylation modulates aggregation in addition to modulating aSyn intracellular dynamics. Finally, we found that the molecular chaperone HSP70 accelerates the entry of aSyn into the nuclear compartment.
Collapse
Affiliation(s)
- Susana Gonçalves
- Cell and Molecular Neuroscience Unit, Instituto de Medicina Molecular, Av. Prof. Egas Moniz, 1649-028 Lisboa, Portugal
| | | |
Collapse
|
36
|
Rendón WO, Martínez-Alonso E, Tomás M, Martínez-Martínez N, Martínez-Menárguez JA. Golgi fragmentation is Rab and SNARE dependent in cellular models of Parkinson’s disease. Histochem Cell Biol 2012; 139:671-84. [DOI: 10.1007/s00418-012-1059-4] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/17/2012] [Indexed: 10/27/2022]
|
37
|
Janda E, Isidoro C, Carresi C, Mollace V. Defective autophagy in Parkinson's disease: role of oxidative stress. Mol Neurobiol 2012; 46:639-61. [PMID: 22899187 DOI: 10.1007/s12035-012-8318-1] [Citation(s) in RCA: 101] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Accepted: 07/30/2012] [Indexed: 12/21/2022]
Abstract
Parkinson's disease (PD) is a paradigmatic example of neurodegenerative disorder with a critical role of oxidative stress in its etiopathogenesis. Genetic susceptibility factors of PD, such as mutations in Parkin, PTEN-induced kinase 1, and DJ-1 as well as the exposure to pesticides and heavy metals, both contribute to altered redox balance and degeneration of dopaminergic neurons in the substantia nigra. Dysregulation of autophagy, a lysosomal-driven process of self degradation of cellular organelles and protein aggregates, is also implicated in PD and PD-related mutations, and environmental toxins deregulate autophagy. However, experimental evidence suggests a complex and ambiguous role of autophagy in PD since either impaired or abnormally upregulated autophagic flux has been shown to cause neuronal loss. Finally, it is generally believed that oxidative stress is a strong proautophagic stimulus. However, some evidence coming from neurobiology as well as from other fields indicate an inhibitory role of reactive oxygen species and reactive nitrogen species on the autophagic machinery. This review examines the scientific evidence supporting different concepts on how autophagy is dysregulated in PD and attempts to reconcile apparently contradictory views on the role of oxidative stress in autophagy regulation. The complex relationship between autophagy and oxidative stress is also considered in the context of the ongoing search for a novel PD therapy.
Collapse
Affiliation(s)
- Elzbieta Janda
- Department of Health Sciences, University Magna Graecia, Edificio Bioscienze, viale Europa, Campus Salvatore Venuta, Germaneto, 88100 Catanzaro, Italy.
| | | | | | | |
Collapse
|
38
|
Lastres-Becker I, Ulusoy A, Innamorato NG, Sahin G, Rábano A, Kirik D, Cuadrado A. α-Synuclein expression and Nrf2 deficiency cooperate to aggravate protein aggregation, neuronal death and inflammation in early-stage Parkinson's disease. Hum Mol Genet 2012; 21:3173-92. [DOI: 10.1093/hmg/dds143] [Citation(s) in RCA: 179] [Impact Index Per Article: 14.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
|
39
|
Bellucci A, Zaltieri M, Navarria L, Grigoletto J, Missale C, Spano P. From α-synuclein to synaptic dysfunctions: new insights into the pathophysiology of Parkinson's disease. Brain Res 2012; 1476:183-202. [PMID: 22560500 DOI: 10.1016/j.brainres.2012.04.014] [Citation(s) in RCA: 68] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2012] [Revised: 03/30/2012] [Accepted: 04/09/2012] [Indexed: 10/28/2022]
Abstract
Alpha-synuclein is a natively unfolded protein playing a key role in the regulation of several neuronal synaptic functions in physiological and pathological conditions. Many studies, over the past years, have shown that it is actively involved in PD pathophysiology. Alpha-synuclein is integrated in a complex network of neuronal processes through the interaction with cytosolic and synaptic proteins. Hence, it is not the sole α-synuclein pathology but its effects on diverse protein partners and specific cellular pathways in the membrane and/or cytosolic districts such as endoplasmic reticulum/Golgi, axonal and synaptic compartments of dopaminergic neurons, that may cause the onset of neuronal cell dysfunction and degeneration which are among the key pathological features of the PD brain. Here we summarize a series of experimental data supporting that α-synuclein aggregation may induce dysfunction and degeneration of synapses via these multiple mechanisms. Taken together, these data add new insights into the complex mechanisms underlying synaptic derangement in PD and other α-synucleinopathies. This article is part of a Special Issue entitled: Brain Integration.
Collapse
Affiliation(s)
- Arianna Bellucci
- Division of Pharmacology, Department of Biomedical Sciences and Biotechnologies and National Institute of Neuroscience, University of Brescia, Brescia, Italy.
| | | | | | | | | | | |
Collapse
|
40
|
Imaging Protein Oligomerization in Neurodegeneration Using Bimolecular Fluorescence Complementation. Methods Enzymol 2012; 506:157-74. [DOI: 10.1016/b978-0-12-391856-7.00033-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
|
41
|
Park MJ, Cheon SM, Bae HR, Kim SH, Kim JW. Elevated levels of α-synuclein oligomer in the cerebrospinal fluid of drug-naïve patients with Parkinson's disease. J Clin Neurol 2011; 7:215-22. [PMID: 22259618 PMCID: PMC3259496 DOI: 10.3988/jcn.2011.7.4.215] [Citation(s) in RCA: 146] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2011] [Revised: 03/29/2011] [Accepted: 03/29/2011] [Indexed: 01/15/2023] Open
Abstract
Background and Purpose The detection of α-synuclein in the body fluids of patients with synucleinopathy has yielded promising but inconclusive results, in part because of conformational changes of α-synuclein in response to environmental conditions. The aim of this study was to determine the feasibility of using α-synuclein as a biological marker for Parkinson's disease (PD). Methods Twenty-three drug-naïve patients with PD (age 62.4±12.7 years, mean±SD; 11 males) and 29 age- and sex-matched neurologic control subjects (age 60.1±16.2 years; 16 males) were recruited. The levels of oligomeric and total α-synuclein in the cerebrospinal fluid (CSF) and plasma were measured using two simultaneous enzyme-linked immunosorbent assays. Results The level of α-synuclein oligomer in the CSF of PD patients was significantly higher in PD patients than in neurological controls, but other findings (plasma α-synuclein oligomer and total α-synuclein in CSF and plasma) did not differ significantly between the two groups. When the control subjects were divided into a symptomatic control group (11 patients who complained of parkinsonian symptoms and were diagnosed with hydrocephalus and drug-induced or vascular parkinsonism) and a neurologic control group (10 normal subjects and 8 patients with diabetic ophthalmoplegia), the level of α-synuclein oligomer in the CSF was still significantly higher in PD patients than in both of the control subgroups. Conclusions These findings provide further evidence for a pathogenic role of the α-synuclein oligomer and suggest that CSF levels of α-synuclein oligomer can be a reliable marker for PD.
Collapse
Affiliation(s)
- Min Jeong Park
- Department of Neurology, Bongseng Memorial Hospital, Busan, Korea
| | | | | | | | | |
Collapse
|
42
|
Convergence of miRNA expression profiling, α-synuclein interacton and GWAS in Parkinson's disease. PLoS One 2011; 6:e25443. [PMID: 22003392 PMCID: PMC3189215 DOI: 10.1371/journal.pone.0025443] [Citation(s) in RCA: 191] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Accepted: 09/05/2011] [Indexed: 11/19/2022] Open
Abstract
miRNAs were recently implicated in the pathogenesis of numerous diseases, including neurological disorders such as Parkinson's disease (PD). miRNAs are abundant in the nervous system, essential for efficient brain function and play important roles in neuronal patterning and cell specification. To further investigate their involvement in the etiology of PD, we conducted miRNA expression profiling in peripheral blood mononuclear cells (PBMCs) of 19 patients and 13 controls using microarrays. We found 18 miRNAs differentially expressed, and pathway analysis of 662 predicted target genes of 11 of these miRNAs revealed an over-representation in pathways previously linked to PD as well as novel pathways. To narrow down the genes for further investigations, we undertook a parallel approach using chromatin immunoprecipitation-sequencing (ChIP-seq) analysis to uncover genome-wide interactions of α-synuclein, a molecule with a central role in both monogenic and idiopathic PD. Convergence of ChIP-seq and miRNomics data highlighted the glycosphingolipid biosynthesis and the ubiquitin proteasome system as key players in PD. We then tested the association of target genes belonging to these pathways with PD risk, and identified nine SNPs in USP37 consistently associated with PD susceptibility in three genome-wide association studies (GWAS) datasets (0.46≤OR≤0.63) and highly significant in the meta-dataset (3.36×10⁻⁴<p <1.94×10⁻³). A SNP in ST8SIA4 was also highly associated with PD (p = 6.15×10⁻³) in the meta-dataset. These findings suggest that several miRNAs may act as regulators of both known and novel biological processes leading to idiopathic PD.
Collapse
|
43
|
Dopamine and paraquat enhance α-synuclein-induced alterations in membrane conductance. Neurotox Res 2011; 20:387-401. [PMID: 21735318 DOI: 10.1007/s12640-011-9255-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2011] [Revised: 06/03/2011] [Accepted: 06/22/2011] [Indexed: 12/21/2022]
Abstract
We have previously demonstrated that α-synuclein overexpression increases the membrane conductance of dopaminergic-like cells. Although α-synuclein is thought to play a central role in the pathogenesis of several neurodegenerative diseases including Parkinson's disease, multiple system atrophy, and diffuse Lewy body disease, the mechanism of action is not completely understood. In this study, we sought to determine whether multiple factors act together with α-synuclein to engender cell vulnerability through an augmentation of membrane conductance. In this article, we employed a cell model that mimics dopaminergic neurons coupled with α-synuclein overexpression and oxidative stressors. We demonstrate an enhancement of α-synuclein-induced toxicity in the presence of combined treatment with dopamine and paraquat, two molecules known to incite oxidative stress. In addition, we show that combined dopamine and paraquat treatment increases the expression of heme oxygenase-1, an antioxidant response protein. Finally, we demonstrate for the first time that combined treatment of dopaminergic cells with paraquat and dopamine enhances α-synuclein-induced leak channel properties resulting in increased membrane conductance. Importantly, these increases are most robust when both paraquat and dopamine are present suggesting the need for multiple oxidative insults to augment α-synuclein-induced disruption of membrane integrity.
Collapse
|
44
|
The neurotransmitter serotonin interrupts α-synuclein amyloid maturation. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2011; 1814:553-61. [PMID: 21376144 PMCID: PMC3092864 DOI: 10.1016/j.bbapap.2011.02.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 02/10/2011] [Accepted: 02/17/2011] [Indexed: 11/21/2022]
Abstract
Indolic derivatives can affect fibril growth of amyloid forming proteins. The neurotransmitter serotonin (5-HT) is of particular interest, as it is an endogenous molecule with a possible link to neuropsychiatric symptoms of Parkinson disease. A key pathomolecular mechanism of Parkinson disease is the misfolding and aggregation of the intrinsically unstructured protein α-synuclein. We performed a biophysical study to investigate an influence between these two molecules. In an isolated in vitro system, 5-HT interfered with α-synuclein amyloid fiber maturation, resulting in the formation of partially structured, SDS-resistant intermediate aggregates. The C-terminal region of α-synuclein was essential for this interaction, which was driven mainly by electrostatic forces. 5-HT did not bind directly to monomeric α-synuclein molecules and we propose a model where 5-HT interacts with early intermediates of α-synuclein amyloidogenesis, which disfavors their further conversion into amyloid fibrils.
Collapse
|
45
|
Abstract
Parkinson's disease (PD) is a primary neurodegenerative movement disorder. In most cases it occurs as a sporadic type of disease, but there are also rare familial forms. Pathologically Parkinson's disease is characterized by loss of dopaminergic neurons in the compact part of substantia nigra. As a part of the neurodegenerative process protein aggregates will accumulate as Lewy bodies in dopaminergic neurons (1). In addition, non-dopaminergic neurons are known to be affected in Parkinsons's disease, for example, in several brain stem nuclei and the olfactoric bulb (2-4). The pathogenic process underlying the death of dopaminergic neurons is far from fully understood. Along with mitochondrial dysfunction, excitotoxicity, neuroinflammation and oxidative stress (5-8), recent evidence indicates that accumulation of protein filaments in Lewy bodies actively takes part in the degeneration of neurons. This will be further discussed below.
Collapse
Affiliation(s)
- V Gundersen
- Department of Anatomy and the CMBN, University of Oslo, Oslo, Norway.
| |
Collapse
|
46
|
Ortiz AN, Oien DB, Moskovitz J, Johnson MA. Quantification of reserve pool dopamine in methionine sulfoxide reductase A null mice. Neuroscience 2011; 177:223-9. [PMID: 21219974 DOI: 10.1016/j.neuroscience.2011.01.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2010] [Revised: 12/13/2010] [Accepted: 01/03/2011] [Indexed: 11/18/2022]
Abstract
Methionine sulfoxide reductase A knockout (MsrA-/-) mice, which serve as a potential model for neurodegeneration, suffer from increased oxidative stress and have previously been found to have chronically elevated brain dopamine (DA) content levels relative to control mice. Additionally, these high levels parallel the increased presynaptic DA release. In this study, fast-scan cyclic voltammetry (FSCV) at carbon-fiber microelectrodes was used to quantify striatal reserve pool DA in knockout mice and wild-type control mice. Reserve pool DA efflux, induced by amphetamine (AMPH), was measured in brain slices from knockout and wild type (WT) mice in the presence of α-methyl-p-tyrosine, a DA synthesis inhibitor. Additionally, the stimulated release of reserve pool DA, mobilized by cocaine (COC), was measured. Both efflux and stimulated release measurements were enhanced in slices from knockout mice, suggesting that these mice have greater reserve pool DA stores than wild-type and that these stores are effectively mobilized. Moreover, dopamine transporter (DAT) labeling data indicate that the difference in measured DA efflux was likely not caused by altered DAT protein expression. Additionally, slices from MsrA-/- and wild-type mice were equally responsive to increasing extracellular calcium concentrations, suggesting that potential differences in either calcium entry or intracellular calcium handling are not responsible for increased reserve pool DA release. Collectively, these results demonstrate that MsrA-/- knockout mice maintain a larger DA reserve pool than wild-type control mice, and that this pool is readily mobilized.
Collapse
Affiliation(s)
- A N Ortiz
- Department of Chemistry and R. N. Adams Institute of Bioanalytical Chemistry, University of Kansas, Lawrence, KS 66045, USA
| | | | | | | |
Collapse
|
47
|
Abstract
Genetic studies have provided valuable insight into the pathological mechanisms underlying Parkinson's disease (PD). The elucidation of genetic components to what was once largely considered a nongenetic disease has given rise to a multitude of cell and animal models enabling the dissection of molecular pathways involved in disease etiology. Here, we review advances obtained from models of dominant mutations in α-synuclein and LRRK2 as well as recessive PINK1, parkin and DJ-1 mutations. Recent genome-wide association studies have implicated genetic variability at two of these loci, α-synuclein and LRRK2, as significant risk factors for developing sporadic PD. This, coupled with the established role of mitochondrial impairment in both familial and sporadic PD, highlights the likelihood of common mechanisms fundamental to the etiology of both.
Collapse
Affiliation(s)
- Ian Martin
- NeuroRegeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Valina L. Dawson
- NeuroRegeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Department of Physiology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| | - Ted M. Dawson
- NeuroRegeneration and Stem Cell Programs, Institute for Cell Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Department of Neurology, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
- Solomon H. Snyder Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA
| |
Collapse
|
48
|
Price DL, Rockenstein E, Ubhi K, Phung V, MacLean-Lewis N, Askay D, Cartier A, Spencer B, Patrick C, Desplats P, Ellisman MH, Masliah E. Alterations in mGluR5 expression and signaling in Lewy body disease and in transgenic models of alpha-synucleinopathy--implications for excitotoxicity. PLoS One 2010; 5:e14020. [PMID: 21103359 PMCID: PMC2982819 DOI: 10.1371/journal.pone.0014020] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2010] [Accepted: 10/19/2010] [Indexed: 12/21/2022] Open
Abstract
Dementia with Lewy bodies (DLB) and Parkinson's Disease (PD) are neurodegenerative disorders of the aging population characterized by the abnormal accumulation of alpha-synuclein (alpha-syn). Previous studies have suggested that excitotoxicity may contribute to neurodegeneration in these disorders, however the underlying mechanisms and their relationship to alpha-syn remain unclear. For this study we proposed that accumulation of alpha-syn might result in alterations in metabotropic glutamate receptors (mGluR), particularly mGluR5 which has been linked to deficits in murine models of PD. In this context, levels of mGluR5 were analyzed in the brains of PD and DLB human cases and alpha-syn transgenic (tg) mice and compared to age-matched, unimpaired controls, we report a 40% increase in the levels of mGluR5 and beta-arrestin immunoreactivity in the frontal cortex, hippocampus and putamen in DLB cases and in the putamen in PD cases. In the hippocampus, mGluR5 was more abundant in the CA3 region and co-localized with alpha-syn aggregates. Similarly, in the hippocampus and basal ganglia of alpha-syn tg mice, levels of mGluR5 were increased and mGluR5 and alpha-syn were co-localized and co-immunoprecipitated, suggesting that alpha-syn interferes with mGluR5 trafficking. The increased levels of mGluR5 were accompanied by a concomitant increase in the activation of downstream signaling components including ERK, Elk-1 and CREB. Consistent with the increased accumulation of alpha-syn and alterations in mGluR5 in cognitive- and motor-associated brain regions, these mice displayed impaired performance in the water maze and pole test, these behavioral alterations were reversed with the mGluR5 antagonist, MPEP. Taken together the results from study suggest that mGluR5 may directly interact with alpha-syn resulting in its over activation and that this over activation may contribute to excitotoxic cell death in select neuronal regions. These results highlight the therapeutic importance of mGluR5 antagonists in alpha-synucleinopathies.
Collapse
Affiliation(s)
- Diana L. Price
- Department of Neurosciences, University of California San Diego, La Jolla, California, United States of America
- National Center for Microscopy and Imaging Research, University of California San Diego, La Jolla, California, United States of America
| | - Edward Rockenstein
- Department of Neurosciences, University of California San Diego, La Jolla, California, United States of America
| | - Kiren Ubhi
- Department of Neurosciences, University of California San Diego, La Jolla, California, United States of America
| | - Van Phung
- National Center for Microscopy and Imaging Research, University of California San Diego, La Jolla, California, United States of America
- Center for Research in Biological Systems, University of California San Diego, La Jolla, California, United States of America
| | - Natalie MacLean-Lewis
- National Center for Microscopy and Imaging Research, University of California San Diego, La Jolla, California, United States of America
- Center for Research in Biological Systems, University of California San Diego, La Jolla, California, United States of America
| | - David Askay
- Department of Neurosciences, University of California San Diego, La Jolla, California, United States of America
- National Center for Microscopy and Imaging Research, University of California San Diego, La Jolla, California, United States of America
| | - Anna Cartier
- Department of Neurosciences, University of California San Diego, La Jolla, California, United States of America
| | - Brian Spencer
- Department of Neurosciences, University of California San Diego, La Jolla, California, United States of America
| | - Christina Patrick
- Department of Neurosciences, University of California San Diego, La Jolla, California, United States of America
| | - Paula Desplats
- Department of Neurosciences, University of California San Diego, La Jolla, California, United States of America
| | - Mark H. Ellisman
- Department of Neurosciences, University of California San Diego, La Jolla, California, United States of America
- National Center for Microscopy and Imaging Research, University of California San Diego, La Jolla, California, United States of America
- Center for Research in Biological Systems, University of California San Diego, La Jolla, California, United States of America
| | - Eliezer Masliah
- Department of Neurosciences, University of California San Diego, La Jolla, California, United States of America
- Department of Pathology, University of California San Diego, La Jolla, California, United States of America
- * E-mail:
| |
Collapse
|
49
|
Meuvis J, Gerard M, Desender L, Baekelandt V, Engelborghs Y. The Conformation and the Aggregation Kinetics of α-Synuclein Depend on the Proline Residues in Its C-Terminal Region. Biochemistry 2010; 49:9345-52. [DOI: 10.1021/bi1010927] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jessika Meuvis
- Laboratory of Biomolecular Dynamics, Katholieke Universiteit Leuven, Celestijnenlaan 200G, B-3001 Leuven, Belgium
| | - Melanie Gerard
- Laboratory of Biochemistry, Katholieke Universiteit Leuven Campus Kortrijk, Etienne Sabbelaan 53, B-8500 Kortrijk, Belgium
| | - Linda Desender
- Laboratory of Biochemistry, Katholieke Universiteit Leuven Campus Kortrijk, Etienne Sabbelaan 53, B-8500 Kortrijk, Belgium
| | - Veerle Baekelandt
- Laboratory for Neurobiology and Gene Therapy, Katholieke Universiteit Leuven, Kapucijnenvoer 33, B-3000 Leuven, Belgium
| | - Yves Engelborghs
- Laboratory of Biomolecular Dynamics, Katholieke Universiteit Leuven, Celestijnenlaan 200G, B-3001 Leuven, Belgium
| |
Collapse
|
50
|
Gonçalves SA, Matos JE, Outeiro TF. Zooming into protein oligomerization in neurodegeneration using BiFC. Trends Biochem Sci 2010; 35:643-51. [PMID: 20561791 DOI: 10.1016/j.tibs.2010.05.007] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Revised: 05/10/2010] [Accepted: 05/13/2010] [Indexed: 11/25/2022]
Abstract
Several neurodegenerative diseases are characterized by the accumulation of misfolded and aggregated proteins, which lead to neurotoxicity. However, the nature of those toxic species is controversial. Developments in optical microscopy and live-cell imaging are essential in providing crucial insight into the molecular mechanisms involved. In particular, the technique of bimolecular fluorescence complementation (BiFC) represents a remarkable improvement for observing protein-protein interactions within living cells. Unlike other techniques, BiFC provides spatial and temporal resolution and can be carried out in a physiological environment. Among other applications, BiFC has been used to study molecular determinants of oligomerization in neurodegenerative disorders, thereby promising to unveil novel targets for therapeutics. We review the applicability of BiFC for investigating the molecular basis of neurodegenerative diseases associated with protein misfolding and aggregation.
Collapse
Affiliation(s)
- Susana A Gonçalves
- Cell and Molecular Neuroscience Unit, Instituto de Medicina Molecular, Av. Prof. Egas Moniz, 1649-028 Lisboa, Portugal
| | | | | |
Collapse
|