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Duță C, Muscurel C, Dogaru CB, Stoian I. Ferroptosis-A Shared Mechanism for Parkinson's Disease and Type 2 Diabetes. Int J Mol Sci 2024; 25:8838. [PMID: 39201524 PMCID: PMC11354749 DOI: 10.3390/ijms25168838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2024] [Revised: 07/31/2024] [Accepted: 08/06/2024] [Indexed: 09/02/2024] Open
Abstract
Type 2 diabetes (T2D) and Parkinson's disease (PD) are the two most frequent age-related chronic diseases. There are many similarities between the two diseases: both are chronic diseases; both are the result of a decrease in a specific substance-insulin in T2D and dopamine in PD; and both are caused by the destruction of specific cells-beta pancreatic cells in T2D and dopaminergic neurons in PD. Recent epidemiological and experimental studies have found that there are common underlying mechanisms in the pathophysiology of T2D and PD: chronic inflammation, mitochondrial dysfunction, impaired protein handling and ferroptosis. Epidemiological research has indicated that there is a higher risk of PD in individuals with T2D. Moreover, clinical studies have observed that the symptoms of Parkinson's disease worsen significantly after the onset of T2D. This article provides an up-to-date review on the intricate interplay between oxidative stress, reactive oxygen species (ROS) and ferroptosis in PD and T2D. By understanding the shared molecular pathways and how they can be modulated, we can develop more effective therapies, or we can repurpose existing drugs to improve patient outcomes in both disorders.
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2
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Galkin M, Priss A, Kyriukha Y, Shvadchak V. Navigating α-Synuclein Aggregation Inhibition: Methods, Mechanisms, and Molecular Targets. CHEM REC 2024; 24:e202300282. [PMID: 37919046 DOI: 10.1002/tcr.202300282] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2023] [Revised: 10/08/2023] [Indexed: 11/04/2023]
Abstract
Parkinson's disease is a yet incurable, age-related neurodegenerative disorder characterized by the aggregation of small neuronal protein α-synuclein into amyloid fibrils. Inhibition of this process is a prospective strategy for developing a disease-modifying treatment. We overview here small molecule, peptide, and protein inhibitors of α-synuclein fibrillization reported to date. Special attention was paid to the specificity of inhibitors and critical analysis of their action mechanisms. Namely, the importance of oxidation of polyphenols and cross-linking of α-synuclein into inhibitory dimers was highlighted. We also compared strategies of targeting monomeric, oligomeric, and fibrillar α-synuclein species, thoroughly discussed the strong and weak sides of different approaches to testing the inhibitors.
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Affiliation(s)
- Maksym Galkin
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Anastasiia Priss
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic, Prague, Czech Republic
| | - Yevhenii Kyriukha
- Department of Biochemistry and Molecular Biophysics, Washington University School of Medicine, Saint Louis, Missouri, 63110, United States
| | - Volodymyr Shvadchak
- Department of Biochemistry and Biotechnology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivsk, Ukraine
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3
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Galkin M, Topcheva O, Priss A, Borisova T, Shvadchak VV. Dopamine-Induced Oligomers of α-Synuclein Inhibit Amyloid Fibril Growth and Show No Toxicity. ACS Chem Neurosci 2023. [PMID: 37162160 DOI: 10.1021/acschemneuro.2c00815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023] Open
Abstract
Parkinson's disease is characterized by the selective death of dopaminergic neurons in the midbrain and accumulation of amyloid fibrils composed of α-synuclein (αSyn). Current treatment involves approaches that compensate the death of dopaminergic neurons by increasing the dopamine levels in remaining cells. However, dopamine can interact with αSyn and produce oligomeric species which were reported to be toxic in many models. We studied formation of dopamine-induced αSyn oligomers and their effect on the αSyn aggregation. Using the Thioflavin T kinetic assay, we have shown that small oligomers efficiently inhibit αSyn fibrillization by binding to fibril ends and blocking the elongation. Moreover, all the fractions of oligomer species proved to be nontoxic in the differentiated SH-SY5Y cell model and showed negligible neurotoxicity on isolated rat synaptosomes. The observed inhibition is an important insight in understanding of dopamine-enhancing therapy on Parkinson's disease progression and explains the absence of pathology enhancement.
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Affiliation(s)
- Maksym Galkin
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo náměstí 542/2, 160 00 Prague 6, Czech Republic
| | - Oleksandra Topcheva
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo náměstí 542/2, 160 00 Prague 6, Czech Republic
| | - Anastasiia Priss
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo náměstí 542/2, 160 00 Prague 6, Czech Republic
| | - Tatiana Borisova
- Department of Neurochemistry, Palladin Institute of Biochemistry, National Academy of Sciences of Ukraine, 9 Leontovycha Street, Kyiv 01054, Ukraine
| | - Volodymyr V Shvadchak
- Laboratory of Chemical Biology, Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo náměstí 542/2, 160 00 Prague 6, Czech Republic
- Department of Biochemistry and Biotechnology, Vasyl Stefanyk Precarpathian National University, 57 Shevchenko Str., Ivano-Frankivsk 76018, Ukraine
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4
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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
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5
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Sessi V, Ibarlucea B, Seichepine F, Klinghammer S, Ibrahim I, Heinzig A, Szabo N, Mikolajick T, Hierlemann A, Frey U, Weber WM, Baraban L, Cuniberti G. Multisite Dopamine Sensing With Femtomolar Resolution Using a CMOS Enabled Aptasensor Chip. Front Neurosci 2022; 16:875656. [PMID: 35720700 PMCID: PMC9204155 DOI: 10.3389/fnins.2022.875656] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Accepted: 05/12/2022] [Indexed: 12/02/2022] Open
Abstract
Many biomarkers including neurotransmitters are found in external body fluids, such as sweat or saliva, but at lower titration levels than they are present in blood. Efficient detection of such biomarkers thus requires, on the one hand, to use techniques offering high sensitivity, and, on the other hand, to use a miniaturized format to carry out diagnostics in a minimally invasive way. Here, we present the hybrid integration of bottom-up silicon-nanowire Schottky-junction FETs (SiNW SJ-FETs) with complementary-metal–oxide–semiconductor (CMOS) readout and amplification electronics to establish a robust biosensing platform with 32 × 32 aptasensor measurement sites at a 100 μm pitch. The applied hetero-junctions yield a selective biomolecular detection down to femtomolar concentrations. Selective and multi-site detection of dopamine is demonstrated at an outstanding sensitivity of ∼1 V/fM. The integrated platform offers great potential for detecting biomarkers at high dilution levels and could be applied, for example, to diagnosing neurodegenerative diseases or monitoring therapy progress based on patient samples, such as tear liquid, saliva, or eccrine sweat.
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Affiliation(s)
- Violetta Sessi
- Institute of Semiconductor and Microsystems, TU Dresden, Dresden, Germany
- Center for Advancing Electronics Dresden, TU Dresden, Dresden, Germany
| | - Bergoi Ibarlucea
- Center for Advancing Electronics Dresden, TU Dresden, Dresden, Germany
- Max Bergman Center of Biomaterials Dresden and Institute for Materials Science, TU Dresden, Dresden, Germany
- Bergoi Ibarlucea,
| | - Florent Seichepine
- RIKEN Quantitative Biological Center, Kobe, Japan
- Imperial College London, London, United Kingdom
| | - Stephanie Klinghammer
- Center for Advancing Electronics Dresden, TU Dresden, Dresden, Germany
- Max Bergman Center of Biomaterials Dresden and Institute for Materials Science, TU Dresden, Dresden, Germany
| | - Imad Ibrahim
- Institute of Semiconductor and Microsystems, TU Dresden, Dresden, Germany
- Center for Advancing Electronics Dresden, TU Dresden, Dresden, Germany
| | - André Heinzig
- Institute of Semiconductor and Microsystems, TU Dresden, Dresden, Germany
| | | | - Thomas Mikolajick
- Institute of Semiconductor and Microsystems, TU Dresden, Dresden, Germany
- Center for Advancing Electronics Dresden, TU Dresden, Dresden, Germany
- NaMLab gGmbH, Dresden, Germany
| | - Andreas Hierlemann
- Department of Biosystems Science and Engineering, Bio Engineering Laboratory, ETH Zürich, Basel, Switzerland
| | - Urs Frey
- RIKEN Quantitative Biological Center, Kobe, Japan
- Department of Biosystems Science and Engineering, Bio Engineering Laboratory, ETH Zürich, Basel, Switzerland
- MaxWell Biosystems AG, Basel, Switzerland
| | - Walter M. Weber
- Center for Advancing Electronics Dresden, TU Dresden, Dresden, Germany
- NaMLab gGmbH, Dresden, Germany
- Institute of Solid State Electronics, TU Wien, Vienna, Austria
- Walter Weber,
| | - Larysa Baraban
- Center for Advancing Electronics Dresden, TU Dresden, Dresden, Germany
- Max Bergman Center of Biomaterials Dresden and Institute for Materials Science, TU Dresden, Dresden, Germany
- Helmholtz-Zentrum Dresden-Rossendorf e.V., Institute of Radiopharmaceutical Cancer Research, Dresden, Germany
- *Correspondence: Larysa Baraban,
| | - Gianaurelio Cuniberti
- Center for Advancing Electronics Dresden, TU Dresden, Dresden, Germany
- Max Bergman Center of Biomaterials Dresden and Institute for Materials Science, TU Dresden, Dresden, Germany
- Gianaurelio Cuniberti,
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Zhang Z, Li M, Zuo Y, Chen S, Zhuo Y, Lu M, Shi G, Gu H. In Vivo Monitoring of pH in Subacute PD Mouse Brains with a Ratiometric Electrochemical Microsensor Based on Poly(melamine) Films. ACS Sens 2022; 7:235-244. [PMID: 34936337 DOI: 10.1021/acssensors.1c02051] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
In vivo monitoring of cerebral pH is of great significance because its disturbance is related to some pathological processes such as neurodegenerative diseases, for example, Parkinson's disease (PD). In this study, we developed an electrochemical microsensor based on poly(melamine) (PMel) films for ratiometric monitoring of pH in subacute PD mouse brains. In this microsensor, PMel films were prepared from a simple electropolymerization approach in a melamine-containing solution, serving as the selective pH recognition membrane undergoing a 2H+/2e- process. Meanwhile, electrochemically oxidized graphene oxide (EOGO) produced a built-in correction signal which helped avoid the environmental interference of the complicated brain systems. The potential difference between the peaks generated from EOGO and PMel gradually decreased with the aqueous pH increasing from 4.0 to 9.0, constituting the detection foundation of the ratiometric electrochemical microsensor (REM). The in vitro studies demonstrated that this proposed method exhibited a high sensitivity (a Nernstian response of -61.35 mV/pH) and remarkable selectivity against amino acids, anions, cations, and biochemical and reactive oxygen species coexisting in the brain. Coupled with its excellent stability and reproducibility and good antibiofouling based on short-term detection, the developed REM could serve as a disposable sensor for the determination of cerebral pH in vivo. Its following successful application in the real-time measurement of pH in the striatum, hippocampus, and cortex of rat brains in the events of global cerebral ischemia/reperfusion verified the reliability of this method. Finally, we adopted this robust REM to systematically analyze and compare the average pH in different regions of normal and subacute PD mouse brains.
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Affiliation(s)
- Ziyi Zhang
- A Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, P. R. China
| | - Mengyin Li
- A Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, P. R. China
| | - Yimei Zuo
- A Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, P. R. China
| | - Shu Chen
- A Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, P. R. China
| | - Yi Zhuo
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, Hunan Provincial Key Laboratory of Neurorestoratology, College of Life Sciences, Hunan Normal University, Changsha, Hunan 410006, P.R. China
| | - Ming Lu
- The National & Local Joint Engineering Laboratory of Animal Peptide Drug Development, Hunan Provincial Key Laboratory of Neurorestoratology, College of Life Sciences, Hunan Normal University, Changsha, Hunan 410006, P.R. China
| | - Guoyue Shi
- School of Chemistry and Molecular Engineering, Shanghai Key Laboratory for Urban Ecological Processes and Eco-Restoration, East China Normal University, 500 Dongchuan Road, Shanghai 200241, P. R. China
| | - Hui Gu
- A Key Laboratory of Theoretical Organic Chemistry and Functional Molecule of Ministry of Education, School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, P. R. China
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7
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Sunny LP, Srikanth P, Sunitha AK, Tembulkar N, Abraham JN. Tryptophan-cardanol fluorescent nanoparticles inhibit α-synuclein aggregation and disrupt amyloid fibrils. J Pept Sci 2021; 28:e3374. [PMID: 34651357 DOI: 10.1002/psc.3374] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 09/20/2021] [Accepted: 09/21/2021] [Indexed: 11/11/2022]
Abstract
Protein misfolding and aggregation play a vital role in several human diseases such as Parkinson's, Alzheimer's, and prion diseases. The development of nanoparticles that modulate aggregation could be potential drug candidates for these neurodegenerative disorders. Parkinson's disease pathogenesis is closely associated with the accumulation of α-synuclein oligomers and fibrils in the substantia nigra of the brain. This report discusses the interactions of novel tryptophan-cardanol nanoparticles with α-synuclein protein monomers and fibrils. These nanoparticles could effectively disrupt α-synuclein fibrils and inhibit fibril formation at low concentrations such as 5 μM. The tryptophan-cardanol nanoparticles inhibit fibril formation from unstructured protein resulting in spherical nanostructures. These nanoparticles could also disassemble amyloid fibrils; the complete disappearance of fibrils was evident after 48 h of incubation with tryptophan-cardanol. The transmission electron microscopy (TEM) micrographs after the incubation did not show any remnants of the peptide aggregates or oligomers. The thioflavin T fluorescence after the disassembly was diminished compared with that of fibrils also supports the inhibitory effect of the nanoparticles. Also, these nanoparticles did not reduce the viability of the SH-SY5Y cells. These findings suggest that the tryptophan-cardanol nanoparticles showed sufficiently high inhibitory activity and may have therapeutic potential for synucleinopathies.
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Affiliation(s)
- Lisni P Sunny
- Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune, India
| | - Priya Srikanth
- Laboratory of Neural Circuits and Behaviour (LNCB), Department of Biology, Indian Institute of Science Education and Research (IISER), Pune, India
| | | | - Niyoti Tembulkar
- Laboratory of Neural Circuits and Behaviour (LNCB), Department of Biology, Indian Institute of Science Education and Research (IISER), Pune, India
| | - Jancy Nixon Abraham
- Polymer Science and Engineering Division, CSIR-National Chemical Laboratory, Pune, India
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8
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Patel S, Howard D, French L. A pH-eQTL Interaction at the RIT2- SYT4 Parkinson's Disease Risk Locus in the Substantia Nigra. Front Aging Neurosci 2021; 13:690632. [PMID: 34305570 PMCID: PMC8299340 DOI: 10.3389/fnagi.2021.690632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2021] [Accepted: 06/14/2021] [Indexed: 11/13/2022] Open
Abstract
Parkinson's disease causes severe motor and cognitive disabilities that result from the progressive loss of dopamine neurons in the substantia nigra. The rs12456492 variant in the RIT2 gene has been repeatedly associated with increased risk for Parkinson's disease. From a transcriptomic perspective, a meta-analysis found that RIT2 gene expression is correlated with pH in the human brain. To assess these pH associations in relation to Parkinson's disease risk, we examined the two datasets that assayed rs12456492, gene expression, and pH in the postmortem human brain. Using the BrainEAC dataset, we replicate the positive correlation between RIT2 gene expression and pH in the human brain (n = 100). Furthermore, we found that the relationship between expression and pH is influenced by rs12456492. When tested across ten brain regions, this interaction is specifically found in the substantia nigra. A similar association was found for the co-localized SYT4 gene. In addition, SYT4 associations are stronger in a combined model with both genes, and the SYT4 interaction appears to be specific to males. In the Genotype-Tissue Expression (GTEx) dataset, the pH associations involving rs12456492 and expression of either SYT4 and RIT2 were not seen. This null finding may be due to the short postmortem intervals of the GTEx tissue samples. In the BrainEAC data, we tested the effect of postmortem interval and only observed the interactions in samples with the longer intervals. These previously unknown associations suggest novel roles for rs12456492, RIT2, and SYT4 in the regulation and response to pH in the substantia nigra.
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Affiliation(s)
- Sejal Patel
- Krembil Centre for Neuroinformatics, Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Derek Howard
- Krembil Centre for Neuroinformatics, Centre for Addiction and Mental Health, Toronto, ON, Canada
| | - Leon French
- Krembil Centre for Neuroinformatics, Centre for Addiction and Mental Health, Toronto, ON, Canada
- Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON, Canada
- Department of Psychiatry, University of Toronto, Toronto, ON, Canada
- Institute for Medical Science, University of Toronto, Toronto, ON, Canada
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9
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Goldstein DS. The Catecholaldehyde Hypothesis for the Pathogenesis of Catecholaminergic Neurodegeneration: What We Know and What We Do Not Know. Int J Mol Sci 2021; 22:ijms22115999. [PMID: 34206133 PMCID: PMC8199574 DOI: 10.3390/ijms22115999] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Revised: 05/25/2021] [Accepted: 05/28/2021] [Indexed: 01/10/2023] Open
Abstract
3,4-Dihydroxyphenylacetaldehyde (DOPAL) is the focus of the catecholaldehyde hypothesis for the pathogenesis of Parkinson’s disease and other Lewy body diseases. The catecholaldehyde is produced via oxidative deamination catalyzed by monoamine oxidase (MAO) acting on cytoplasmic dopamine. DOPAL is autotoxic, in that it can harm the same cells in which it is produced. Normally, DOPAL is detoxified by aldehyde dehydrogenase (ALDH)-mediated conversion to 3,4-dihydroxyphenylacetic acid (DOPAC), which rapidly exits the neurons. Genetic, environmental, or drug-induced manipulations of ALDH that build up DOPAL promote catecholaminergic neurodegeneration. A concept derived from the catecholaldehyde hypothesis imputes deleterious interactions between DOPAL and the protein alpha-synuclein (αS), a major component of Lewy bodies. DOPAL potently oligomerizes αS, and αS oligomers impede vesicular and mitochondrial functions, shifting the fate of cytoplasmic dopamine toward the MAO-catalyzed formation of DOPAL—destabilizing vicious cycles. Direct and indirect effects of DOPAL and of DOPAL-induced misfolded proteins could “freeze” intraneuronal reactions, plasticity of which is required for neuronal homeostasis. The extent to which DOPAL toxicity is mediated by interactions with αS, and vice versa, is poorly understood. Because of numerous secondary effects such as augmented spontaneous oxidation of dopamine by MAO inhibition, there has been insufficient testing of the catecholaldehyde hypothesis in animal models. The clinical pathophysiological significance of genetics, emotional stress, environmental agents, and interactions with numerous proteins relevant to the catecholaldehyde hypothesis are matters for future research. The imposing complexity of intraneuronal catecholamine metabolism seems to require a computational modeling approach to elucidate clinical pathogenetic mechanisms and devise pathophysiology-based, individualized treatments.
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Affiliation(s)
- David S Goldstein
- Autonomic Medicine Section, Clinical Neurosciences Program, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA
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10
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Hypoxia, Acidification and Inflammation: Partners in Crime in Parkinson’s Disease Pathogenesis? IMMUNO 2021. [DOI: 10.3390/immuno1020006] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Like in other neurodegenerative diseases, protein aggregation, mitochondrial dysfunction, oxidative stress and neuroinflammation are hallmarks of Parkinson’s disease (PD). Differentiating characteristics of PD include the central role of α-synuclein in the aggregation pathology, a distinct vulnerability of the striato-nigral system with the related motor symptoms, as well as specific mitochondrial deficits. Which molecular alterations cause neurodegeneration and drive PD pathogenesis is poorly understood. Here, we summarize evidence of the involvement of three interdependent factors in PD and suggest that their interplay is likely a trigger and/or aggravator of PD-related neurodegeneration: hypoxia, acidification and inflammation. We aim to integrate the existing knowledge on the well-established role of inflammation and immunity, the emerging interest in the contribution of hypoxic insults and the rather neglected effects of brain acidification in PD pathogenesis. Their tight association as an important aspect of the disease merits detailed investigation. Consequences of related injuries are discussed in the context of aging and the interaction of different brain cell types, in particular with regard to potential consequences on the vulnerability of dopaminergic neurons in the substantia nigra. A special focus is put on the identification of current knowledge gaps and we emphasize the importance of related insights from other research fields, such as cancer research and immunometabolism, for neurodegeneration research. The highlighted interplay of hypoxia, acidification and inflammation is likely also of relevance for other neurodegenerative diseases, despite disease-specific biochemical and metabolic alterations.
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Hayashi J, Ton J, Negi S, Stephens DEKM, Pountney DL, Preiss T, Carver JA. The Effect of Oxidized Dopamine on the Structure and Molecular Chaperone Function of the Small Heat-Shock Proteins, αB-Crystallin and Hsp27. Int J Mol Sci 2021; 22:ijms22073700. [PMID: 33918165 PMCID: PMC8037807 DOI: 10.3390/ijms22073700] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2021] [Revised: 03/14/2021] [Accepted: 03/30/2021] [Indexed: 11/16/2022] Open
Abstract
Oxidation of the neurotransmitter, dopamine (DA), is a pathological hallmark of Parkinson’s disease (PD). Oxidized DA forms adducts with proteins which can alter their functionality. αB-crystallin and Hsp27 are intracellular, small heat-shock molecular chaperone proteins (sHsps) which form the first line of defense to prevent protein aggregation under conditions of cellular stress. In vitro, the effects of oxidized DA on the structure and function of αB-crystallin and Hsp27 were investigated. Oxidized DA promoted the cross-linking of αB-crystallin and Hsp27 to form well-defined dimer, trimer, tetramer, etc., species, as monitored by SDS-PAGE. Lysine residues were involved in the cross-links. The secondary structure of the sHsps was not altered significantly upon cross-linking with oxidized DA but their oligomeric size was increased. When modified with a molar equivalent of DA, sHsp chaperone functionality was largely retained in preventing both amorphous and amyloid fibrillar aggregation, including fibril formation of mutant (A53T) α-synuclein, a protein whose aggregation is associated with autosomal PD. In the main, higher levels of sHsp modification with DA led to a reduction in chaperone effectiveness. In vivo, DA is sequestered into acidic vesicles to prevent its oxidation and, intracellularly, oxidation is minimized by mM levels of the antioxidant, glutathione. In vitro, acidic pH and glutathione prevented the formation of oxidized DA-induced cross-linking of the sHsps. Oxidized DA-modified αB-crystallin and Hsp27 were not cytotoxic. In a cellular context, retention of significant chaperone functionality by mildly oxidized DA-modified sHsps would contribute to proteostasis by preventing protein aggregation (particularly of α-synuclein) that is associated with PD.
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Affiliation(s)
- Junna Hayashi
- Research School of Chemistry, The Australian National University, Acton, ACT 2601, Australia; (J.H.); (J.T.); (S.N.); (D.E.K.M.S.)
| | - Jennifer Ton
- Research School of Chemistry, The Australian National University, Acton, ACT 2601, Australia; (J.H.); (J.T.); (S.N.); (D.E.K.M.S.)
| | - Sparsh Negi
- Research School of Chemistry, The Australian National University, Acton, ACT 2601, Australia; (J.H.); (J.T.); (S.N.); (D.E.K.M.S.)
- Department of Biochemical Engineering and Biotechnology, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Daniel E. K. M. Stephens
- Research School of Chemistry, The Australian National University, Acton, ACT 2601, Australia; (J.H.); (J.T.); (S.N.); (D.E.K.M.S.)
| | - Dean L. Pountney
- School of Medical Science, Griffith University, Gold Coast, QLD 4215, Australia;
| | - Thomas Preiss
- Department of Genome Sciences, John Curtin School of Medical Research, The Australian National University, Acton, ACT 2601, Australia;
- Victor Chang Cardiac Research Institute, Sydney, NSW 2010, Australia
| | - John A. Carver
- Research School of Chemistry, The Australian National University, Acton, ACT 2601, Australia; (J.H.); (J.T.); (S.N.); (D.E.K.M.S.)
- Correspondence: ; Tel.: +61-2-6125-9748
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12
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Potent synthetic and endogenous ligands for the adopted orphan nuclear receptor Nurr1. Exp Mol Med 2021; 53:19-29. [PMID: 33479411 PMCID: PMC8080818 DOI: 10.1038/s12276-021-00555-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2020] [Revised: 10/19/2020] [Accepted: 11/05/2020] [Indexed: 01/30/2023] Open
Abstract
Until recently, Nurr1 (NR4A2) was known as an orphan nuclear receptor without a canonical ligand-binding domain, featuring instead a narrow and tight cavity for small molecular ligands to bind. In-depth characterization of its ligand-binding pocket revealed that it is highly dynamic, with its structural conformation changing more than twice on the microsecond-to-millisecond timescale. This observation suggests the possibility that certain ligands are able to squeeze into this narrow space, inducing a conformational change to create an accessible cavity. The cocrystallographic structure of Nurr1 bound to endogenous ligands such as prostaglandin E1/A1 and 5,6-dihydroxyindole contributed to clarifying the crucial roles of Nurr1 and opening new avenues for therapeutic interventions for neurodegenerative and/or inflammatory diseases related to Nurr1. This review introduces novel endogenous and synthetic Nurr1 agonists and discusses their potential effects in Nurr1-related diseases.
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13
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Gracia P, Camino JD, Volpicelli-Daley L, Cremades N. Multiplicity of α-Synuclein Aggregated Species and Their Possible Roles in Disease. Int J Mol Sci 2020; 21:E8043. [PMID: 33126694 PMCID: PMC7663424 DOI: 10.3390/ijms21218043] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2020] [Revised: 10/21/2020] [Accepted: 10/27/2020] [Indexed: 12/14/2022] Open
Abstract
α-Synuclein amyloid aggregation is a defining molecular feature of Parkinson's disease, Lewy body dementia, and multiple system atrophy, but can also be found in other neurodegenerative disorders such as Alzheimer's disease. The process of α-synuclein aggregation can be initiated through alternative nucleation mechanisms and dominated by different secondary processes giving rise to multiple amyloid polymorphs and intermediate species. Some aggregated species have more inherent abilities to induce cellular stress and toxicity, while others seem to be more potent in propagating neurodegeneration. The preference for particular types of polymorphs depends on the solution conditions and the cellular microenvironment that the protein encounters, which is likely related to the distinct cellular locations of α-synuclein inclusions in different synucleinopathies, and the existence of disease-specific amyloid polymorphs. In this review, we discuss our current understanding on the nature and structure of the various types of α-synuclein aggregated species and their possible roles in pathology. Precisely defining these distinct α-synuclein species will contribute to understanding the molecular origins of these disorders, developing accurate diagnoses, and designing effective therapeutic interventions for these highly debilitating neurodegenerative diseases.
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Affiliation(s)
- Pablo Gracia
- Joint Unit BIFI-IQFR (CSIC), Institute for Biocomputation and Physics of Complex Systems (BIFI), University of Zaragoza, 50018 Zaragoza, Spain; (P.G.); (J.D.C.)
| | - José D. Camino
- Joint Unit BIFI-IQFR (CSIC), Institute for Biocomputation and Physics of Complex Systems (BIFI), University of Zaragoza, 50018 Zaragoza, Spain; (P.G.); (J.D.C.)
| | - Laura Volpicelli-Daley
- Center for Neurodegeneration and Experimental Therapeutics, Department of Neurology, University of Alabama at Birmingham, Birmingham, AL 35294, USA;
| | - Nunilo Cremades
- Joint Unit BIFI-IQFR (CSIC), Institute for Biocomputation and Physics of Complex Systems (BIFI), University of Zaragoza, 50018 Zaragoza, Spain; (P.G.); (J.D.C.)
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14
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Goldstein DS. The "Sick-but-not-Dead" Phenomenon Applied to Catecholamine Deficiency in Neurodegenerative Diseases. Semin Neurol 2020; 40:502-514. [PMID: 32906170 PMCID: PMC10680399 DOI: 10.1055/s-0040-1713874] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The catecholamines dopamine and norepinephrine are key central neurotransmitters that participate in many neurobehavioral processes and disease states. Norepinephrine is also the main neurotransmitter mediating regulation of the circulation by the sympathetic nervous system. Several neurodegenerative disorders feature catecholamine deficiency. The most common is Parkinson's disease (PD), in which putamen dopamine content is drastically reduced. PD also entails severely decreased myocardial norepinephrine content, a feature that characterizes two other Lewy body diseases-pure autonomic failure and dementia with Lewy bodies. It is widely presumed that tissue catecholamine depletion in these conditions results directly from loss of catecholaminergic neurons; however, as highlighted in this review, there are also important functional abnormalities in extant residual catecholaminergic neurons. We refer to this as the "sick-but-not-dead" phenomenon. The malfunctions include diminished dopamine biosynthesis via tyrosine hydroxylase (TH) and L-aromatic-amino-acid decarboxylase (LAAAD), inefficient vesicular sequestration of cytoplasmic catecholamines, and attenuated neuronal reuptake via cell membrane catecholamine transporters. A unifying explanation for catecholaminergic neurodegeneration is autotoxicity exerted by 3,4-dihydroxyphenylacetaldehyde (DOPAL), an obligate intermediate in cytoplasmic dopamine metabolism. In PD, putamen DOPAL is built up with respect to dopamine, associated with a vesicular storage defect and decreased aldehyde dehydrogenase activity. Probably via spontaneous oxidation, DOPAL potently oligomerizes and forms quinone-protein adducts with ("quinonizes") α-synuclein (AS), a major constituent in Lewy bodies, and DOPAL-induced AS oligomers impede vesicular storage. DOPAL also quinonizes numerous intracellular proteins and inhibits enzymatic activities of TH and LAAAD. Treatments targeting DOPAL formation and oxidation therefore might rescue sick-but-not-dead catecholaminergic neurons in Lewy body diseases.
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Affiliation(s)
- David S. Goldstein
- Autonomic Medicine Section, Clinical Neurosciences Program, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland
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15
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Calvo JS, Mulpuri NV, Dao A, Qazi NK, Meloni G. Membrane insertion exacerbates the α-Synuclein-Cu(II) dopamine oxidase activity: Metallothionein-3 targets and silences all α-synuclein-Cu(II) complexes. Free Radic Biol Med 2020; 158:149-161. [PMID: 32712192 PMCID: PMC7484060 DOI: 10.1016/j.freeradbiomed.2020.07.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/17/2020] [Revised: 07/03/2020] [Accepted: 07/05/2020] [Indexed: 10/23/2022]
Abstract
Copper binding to α-synuclein (α-Syn), the major component of intracellular Lewy body inclusions in substantia nigra dopaminergic neurons, potentiate its toxic redox-reactivity and plays a detrimental role in the etiology of Parkinson disease (PD). Soluble α-synuclein-Cu(II) complexes possess dopamine oxidase activity and catalyze ROS production in the presence of biological reducing agents via Cu(II)/Cu(I) redox cycling. These metal-centered redox reactivities harmfully promote the oxidation and oligomerization of α-Syn. While this chemistry has been investigated on recombinantly expressed soluble α-Syn, in vivo, α-Syn is acetylated at its N-terminus and is present in equilibrium between soluble and membrane-bound forms. This post-translational modification and membrane-binding alter the Cu(II) coordination environment and binding modes and are expected to affect the α-Syn-Cu(II) reactivity. In this work, we first investigated the reactivity of acetylated and membrane-bound complexes, and subsequently addressed whether the brain metalloprotein Zn7-metallothionein-3 (Zn7MT-3) possesses a multifaceted-role in targeting these aberrant copper interactions and consequent reactivity. Through biochemical characterization of the reactivity of the non-acetylated/N-terminally acetylated soluble or membrane-bound α-Syn-Cu(II) complexes towards dopamine, oxygen, and ascorbate, we reveal that membrane insertion dramatically exacerbates the catechol oxidase-like reactivity of α-Syn-Cu(II) as a result of a change in the Cu(II) coordination environment, thereby potentiating its toxicity. Moreover, we show that Zn7MT-3 can efficiently target all α-Syn-Cu(II) complexes through Cu(II) removal, preventing their deleterious redox activities. We demonstrate that the Cu(II) reduction by the thiolate ligands of Zn7MT-3 and the formation of Cu(I)4Zn4MT-3 featuring an unusual redox-inert Cu(I)4-thiolate cluster is the molecular mechanism responsible for the protective effect exerted by MT-3 towards α-Syn-Cu(II). This work provides the molecular basis for new therapeutic interventions to control the deleterious bioinorganic chemistry of α-Syn-Cu(II).
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Affiliation(s)
- Jenifer S Calvo
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, TX, 75080, USA
| | - Neha V Mulpuri
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, TX, 75080, USA
| | - Alex Dao
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, TX, 75080, USA
| | - Nabeeha K Qazi
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, TX, 75080, USA
| | - Gabriele Meloni
- Department of Chemistry and Biochemistry, The University of Texas at Dallas, Richardson, TX, 75080, USA.
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16
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Raina A, Leite K, Guerin S, Mahajani SU, Chakrabarti KS, Voll D, Becker S, Griesinger C, Bähr M, Kügler S. Dopamine promotes the neurodegenerative potential of β-synuclein. J Neurochem 2020; 156:674-691. [PMID: 32730640 DOI: 10.1111/jnc.15134] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 07/09/2020] [Accepted: 07/21/2020] [Indexed: 01/21/2023]
Abstract
A contribution of α-Synuclein (α-Syn) to etiology of Parkinson´s disease (PD) and Dementia with Lewy bodies (DLB) is currently undisputed, while the impact of the closely related β-Synuclein (β-Syn) on these disorders remains enigmatic. β-Syn has long been considered to be an attenuator of the neurotoxic effects of α-Syn, but in a rodent model of PD β-Syn induced robust neurodegeneration in dopaminergic neurons of the substantia nigra. Given that dopaminergic nigral neurons are selectively vulnerable to neurodegeneration in PD, we now investigated if dopamine can promote the neurodegenerative potential of β-Syn. We show that in cultured rodent and human neurons a dopaminergic neurotransmitter phenotype substantially enhanced β-Syn-induced neurodegeneration, irrespective if dopamine is synthesized within neurons or up-taken from extracellular space. Nuclear magnetic resonance interaction and thioflavin-T incorporation studies demonstrated that dopamine and its oxidized metabolites 3,4-dihydroxyphenylacetaldehyde (DOPAL) and dopaminochrome (DCH) directly interact with β-Syn, thereby enabling structural and functional modifications. Interaction of DCH with β-Syn inhibits its aggregation, which might result in increased levels of neurotoxic oligomeric β-Syn. Since protection of outer mitochondrial membrane integrity prevented the additive neurodegenerative effect of dopamine and β-Syn, such oligomers might act at a mitochondrial level similar to what is suggested for α-Syn. In conclusion, our results suggest that β-Syn can play a significant pathophysiological role in etiology of PD through its interaction with dopamine metabolites and thus should be re-considered as a disease-relevant factor, at least for those symptoms of PD that depend on degeneration of nigral dopaminergic neurons.
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Affiliation(s)
- Anupam Raina
- Department of Neurology, University Medicine Göttingen, Göttingen, Germany
| | - Kristian Leite
- Department of Neurology, University Medicine Göttingen, Göttingen, Germany
| | - Sofia Guerin
- Department of Neurology, University Medicine Göttingen, Göttingen, Germany
| | | | | | - Diana Voll
- Department of Neurology, University Medicine Göttingen, Göttingen, Germany
| | - Stefan Becker
- Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany
| | | | - Mathias Bähr
- Department of Neurology, University Medicine Göttingen, Göttingen, Germany
| | - Sebastian Kügler
- Department of Neurology, University Medicine Göttingen, Göttingen, Germany.,Center Nanoscale Microscopy and Physiology of the Brain (CNMPB), Göttingen, Germany
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17
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Jaramillo A, Barrera-Gutiérrez R, Cortés MT. Synthesis, Follow-Up, and Characterization of Polydopamine-like Coatings Departing from Micromolar Dopamine- o-Quinone Precursor Concentrations. ACS OMEGA 2020; 5:15016-15027. [PMID: 32637775 PMCID: PMC7330902 DOI: 10.1021/acsomega.0c00676] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2020] [Accepted: 04/01/2020] [Indexed: 06/11/2023]
Abstract
The understanding of oxidized species derived from the neurotransmitter dopamine (DA) is a relevant topic for both the medical field (Parkinson's disease) as well as for the field of materials science where the formation process of polydopamine (PDA) films is an active area of research. Polymers that interact strongly with almost all surfaces but have a low electrical conductivity have been obtained by the chemical oxidation of DA. Since electrical conductivity is a desired property for several applications, deposition alternatives such as electrochemical PDA synthesis have been proposed, but the results are still insufficient. In this context, we propose a new PDA chemical-electrochemical deposition process on glassy carbon electrodes. The chemical oxidation step that converts dopamine into dopamine-o-quinone previous to the electrochemical deposition was crucial to decrease the precursor concentration to the micromolar range. The PDA-like films synthesized by this method had high adhesion and low charge-transfer resistance, which was evidenced by impedance measurements and the successful electrodeposition of a polypyrrole coating on top of a PDA-like film. In addition, we observed that anodization of GC surfaces increases sensitivity toward six electroactive couples derived from DA oxidation in the pH regimes studied. These results show the complexity of the intermediates formed during the electrochemical polymerization of PDA.
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Affiliation(s)
- Andrés
M. Jaramillo
- Department of Chemistry, Universidad de Los Andes, Cra 1 N° 18A-12, Bogotá 111711, Colombia
| | | | - María T. Cortés
- Department of Chemistry, Universidad de Los Andes, Cra 1 N° 18A-12, Bogotá 111711, Colombia
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18
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Zhao H, Huang S, Palanisamy S, Wang C, Rainer G, Zhang X. Alpha-Synuclein Dopaminylation Presented in Plasma of Both Healthy Subjects and Parkinson's Disease Patients. Proteomics Clin Appl 2020; 14:e1900117. [PMID: 32538547 DOI: 10.1002/prca.201900117] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Revised: 05/03/2020] [Indexed: 02/04/2023]
Abstract
PURPOSE Alpha-synuclein (α-syn) dopaminylation can lead to the death of dopaminergic neurons in the brain and is a risk factor of Parkinson's disease (PD). This study aims to examine whether such a posttranslational modification (PTM) is presented in human blood plasma. EXPERIMENTAL DESIGN In vitro reaction simulation between α-syn and dopamine (DA) is conducted to study the biochemical mechanism. Then α-syn from human blood plasma samples is detected by using immunoprecipitation-mass spectrometry (IP-MS). Lastly the levels of endogenous α-syn and α-syn dopaminylation in 88 blood plasma samples from patients with PD, major depressive disorder (MDD), and healthy control (HC) are compared. RESULTS DA modifies α-syn with the addition of dopamine-quinone (DAQ) into lysine sites of α-syn in vitro and the addition of DAQ and 3,4-dihydroxyphenylacetaldehyde (DOPAL) in plasma samples. The unmodified α-syn between the PD and HC groups showed similar levels. The levels of two peptides, one with lysine 34 (34 K) DAQ modification and the other with lysine 23 (23 K) ubiquitination, are significantly higher in PD and MDD compared with HC. CONCLUSIONS AND CLINICAL RELEVANCE Thus, α-syn dopaminylation is measurable and might be used to indicatethe presence and progression of neurological disorders.
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Affiliation(s)
- Huiyuan Zhao
- Section of Medicine, University of Fribourg, Fribourg, CH1700, Switzerland.,Division of Biological Technology, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, China, 116023
| | - Shuai Huang
- Division of Biological Technology, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, China, 116023
| | - Sivakumar Palanisamy
- Division of Biological Technology, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, China, 116023
| | - Cui Wang
- Department of Neurology, Dalian Central Hospital, Dalian, China, 116033
| | - Gregor Rainer
- Section of Medicine, University of Fribourg, Fribourg, CH1700, Switzerland
| | - Xiaozhe Zhang
- Division of Biological Technology, Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian, China, 116023
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19
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Goldstein DS. The catecholaldehyde hypothesis: where MAO fits in. J Neural Transm (Vienna) 2020; 127:169-177. [PMID: 31807952 PMCID: PMC10680281 DOI: 10.1007/s00702-019-02106-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 11/14/2019] [Indexed: 12/13/2022]
Abstract
Monoamine oxidase (MAO) plays a central role in the metabolism of the neurotransmitters dopamine, norepinephrine, and serotonin. This brief review focuses on 3,4-dihydroxyphenylacetaldehyde (DOPAL), which is the immediate product of MAO acting on cytoplasmic dopamine. DOPAL is toxic; however, normally DOPAL is converted via aldehyde dehydrogenase (ALDH) to 3,4-dihydroxyphenylacetic acid (DOPAC), which rapidly exits the neurons. In addition to vesicular uptake of dopamine via the vesicular monoamine transporter (VMAT), the two-enzyme sequence of MAO and ALDH keeps cytoplasmic dopamine levels low. Dopamine oxidizes readily to form toxic products that could threaten neuronal homeostasis. The catecholaldehyde hypothesis posits that diseases featuring catecholaminergic neurodegeneration result from harmful interactions between DOPAL and the protein alpha-synuclein, a major component of Lewy bodies in diseases such as Parkinson disease, dementia with Lewy bodies, and pure autonomic failure. DOPAL potently oligomerizes alpha-synuclein, and alpha-synuclein oligomers impede vesicular functions, shifting the fate of cytoplasmic dopamine toward MAO-catalyzed formation of DOPAL-a vicious cycle. When MAO deaminates dopamine to form DOPAL, hydrogen peroxide is generated; and DOPAL, hydrogen peroxide, and divalent metal cations react to form hydroxyl radicals, which peroxidate lipid membranes. Lipid peroxidation products in turn inhibit ALDH, causing DOPAL to accumulate-another vicious cycle. MAO inhibition decreases DOPAL formation but concurrently increases the spontaneous oxidation of dopamine, potentially trading off one form of toxicity for another. These considerations rationalize a neuroprotection strategy based on concurrent treatment with an MAO inhibitor and an anti-oxidant.
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Affiliation(s)
- David S Goldstein
- Autonomic Medicine Section, Clinical Neurosciences Program, Division of Intramural Research, National Institute of Neurological, Disorders and Stroke, National Institutes of Health, 9000 Rockville Pike MSC-1620, Building 10 Room 8N260, Bethesda, MD, 20892-1620, USA.
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20
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Candelise N, Schmitz M, Thüne K, Cramm M, Rabano A, Zafar S, Stoops E, Vanderstichele H, Villar-Pique A, Llorens F, Zerr I. Effect of the micro-environment on α-synuclein conversion and implication in seeded conversion assays. Transl Neurodegener 2020; 9:5. [PMID: 31988747 PMCID: PMC6966864 DOI: 10.1186/s40035-019-0181-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 12/23/2019] [Indexed: 01/28/2023] Open
Abstract
Background α-Synuclein is a small soluble protein, whose physiological function in the healthy brain is poorly understood. Intracellular inclusions of α-synuclein, referred to as Lewy bodies (LBs), are pathological hallmarks of α-synucleinopathies, such as Parkinson’s disease (PD) or dementia with Lewy bodies (DLB). Main body Understanding of the molecular basis as well as the factors or conditions promoting α-synuclein misfolding and aggregation is an important step towards the comprehension of pathological mechanism of α-synucleinopathies and for the development of efficient therapeutic strategies. Based on the conversion and aggregation mechanism of α-synuclein, novel diagnostic tests, such as protein misfolding seeded conversion assays, e.g. the real-time quaking-induced conversion (RT-QuIC), had been developed. In diagnostics, α-synuclein RT-QuIC exhibits a specificity between 82 and 100% while the sensitivity varies between 70 and 100% among different laboratories. In addition, the α-synuclein RT-QuIC can be used to study the α-synuclein-seeding-characteristics of different α-synucleinopathies and to differentiate between DLB and PD. Conclusion The variable diagnostic accuracy of current α-synuclein RT-QuIC occurs due to different protocols, cohorts and material etc.. An impact of micro-environmental factors on the α-synuclein aggregation and conversion process and the occurrence and detection of differential misfolded α-synuclein types or strains might underpin the clinical heterogeneity of α-synucleinopathies.
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Affiliation(s)
- Niccolo Candelise
- 1Department of Neurology, University Medicine Goettingen and the German Center for Neurodegenerative Diseases (DZNE), Robert-Koch -Straße 40, 37075 Göttingen, Germany.,3Department of Experimental, Diagnostic and Speciality Medicine, University of Bologna, Bologna, Italy
| | - Matthias Schmitz
- 1Department of Neurology, University Medicine Goettingen and the German Center for Neurodegenerative Diseases (DZNE), Robert-Koch -Straße 40, 37075 Göttingen, Germany
| | - Katrin Thüne
- 1Department of Neurology, University Medicine Goettingen and the German Center for Neurodegenerative Diseases (DZNE), Robert-Koch -Straße 40, 37075 Göttingen, Germany
| | - Maria Cramm
- 1Department of Neurology, University Medicine Goettingen and the German Center for Neurodegenerative Diseases (DZNE), Robert-Koch -Straße 40, 37075 Göttingen, Germany
| | - Alberto Rabano
- 4Departamento de Neuropatología y Banco de Tejidos (BT-CIEN), Fundación CIEN, Instituto de Salud Carlos III Centro Alzheimer Fundación Reina Sofíac, Valderrebollo n° 5, 28031 Madrid, Spain
| | - Saima Zafar
- 1Department of Neurology, University Medicine Goettingen and the German Center for Neurodegenerative Diseases (DZNE), Robert-Koch -Straße 40, 37075 Göttingen, Germany.,2Biomedical Engineering and Sciences Department, School of Mechanical and Manufacturing Engineering (SMME), National University of Sciences and Technology (NUST), Islamabad, Pakistan
| | - Erik Stoops
- ADx NeuroSciences, Technologiepark 4, Ghent, Belgium
| | | | - Anna Villar-Pique
- 1Department of Neurology, University Medicine Goettingen and the German Center for Neurodegenerative Diseases (DZNE), Robert-Koch -Straße 40, 37075 Göttingen, Germany.,6CIBERNED (Network center for biomedical research of neurodegenerative diseases), Institute Carlos III, Madrid, Spain
| | - Franc Llorens
- 1Department of Neurology, University Medicine Goettingen and the German Center for Neurodegenerative Diseases (DZNE), Robert-Koch -Straße 40, 37075 Göttingen, Germany.,6CIBERNED (Network center for biomedical research of neurodegenerative diseases), Institute Carlos III, Madrid, Spain.,7Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain
| | - Inga Zerr
- 1Department of Neurology, University Medicine Goettingen and the German Center for Neurodegenerative Diseases (DZNE), Robert-Koch -Straße 40, 37075 Göttingen, Germany
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21
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Jinsmaa Y, Isonaka R, Sharabi Y, Goldstein DS. 3,4-Dihydroxyphenylacetaldehyde Is More Efficient than Dopamine in Oligomerizing and Quinonizing α-Synuclein. J Pharmacol Exp Ther 2019; 372:157-165. [PMID: 31744850 DOI: 10.1124/jpet.119.262246] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2019] [Accepted: 11/13/2019] [Indexed: 12/11/2022] Open
Abstract
Lewy body diseases such as Parkinson's disease involve intraneuronal deposition of the protein α-synuclein (AS) and depletion of nigrostriatal dopamine (DA). Interactions of AS with DA oxidation products may link these neurohistopathologic and neurochemical abnormalities via two potential pathways: spontaneous oxidation of DA to dopamine-quinone and enzymatic oxidation of DA catalyzed by monoamine oxidase to form 3,4-dihydroxyphenylacetaldehyde (DOPAL), which is then oxidized to DOPAL-Q. We compared these two pathways in terms of the ability of DA and DOPAL to modify AS. DOPAL was far more potent than DA both in oligomerizing and forming quinone-protein adducts with (quinonizing) AS. The DOPAL-induced protein modifications were enhanced similarly by pro-oxidation with Cu(II) or tyrosinase and inhibited similarly by antioxidation with N-acetylcysteine. Dopamine oxidation evoked by Cu(II) or tyrosinase did not quinonize AS. In cultured MO3.13 human oligodendrocytes DOPAL resulted in the formation of numerous intracellular quinoproteins that were visualized by near-infrared spectroscopy. We conclude that of the two routes by which oxidation of DA modifies AS and other proteins the route via DOPAL is more prominent. The results support developing experimental therapeutic strategies that might mitigate deleterious modifications of proteins such as AS in Lewy body diseases by targeting DOPAL formation and oxidation. SIGNIFICANCE STATEMENT: Interactions of the protein α-synuclein with products of dopamine oxidation in the neuronal cytoplasm may link two hallmark abnormalities of Parkinson disease: Lewy bodies (which contain abundant AS) and nigrostriatal DA depletion (which produces the characteristic movement disorder). Of the two potential routes by which DA oxidation may alter AS and other proteins, the route via the autotoxic catecholaldehyde 3,4-dihydroxyphenylacetaldehyde is more prominent; the results support experimental therapeutic strategies targeting DOPAL formation and DOPAL-induced protein modifications.
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Affiliation(s)
- Yunden Jinsmaa
- Autonomic Medicine Section, Clinical Neuroscience Program, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland (Y.J., R.I., D.S.G.); and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel (Y.S.)
| | - Risa Isonaka
- Autonomic Medicine Section, Clinical Neuroscience Program, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland (Y.J., R.I., D.S.G.); and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel (Y.S.)
| | - Yehonatan Sharabi
- Autonomic Medicine Section, Clinical Neuroscience Program, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland (Y.J., R.I., D.S.G.); and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel (Y.S.)
| | - David S Goldstein
- Autonomic Medicine Section, Clinical Neuroscience Program, Division of Intramural Research, National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, Maryland (Y.J., R.I., D.S.G.); and Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel (Y.S.)
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22
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Singh P, Bhat R. Binding of Noradrenaline to Native and Intermediate States during the Fibrillation of α-Synuclein Leads to the Formation of Stable and Structured Cytotoxic Species. ACS Chem Neurosci 2019; 10:2741-2755. [PMID: 30917654 DOI: 10.1021/acschemneuro.8b00650] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Parkinson's disease is characterized by the deterioration of dopaminergic neurons of substantia nigra pars compacta along with a substantial loss of noradrenergic neurons of the locus coeruleus, which is the major source of noradrenaline (NA) in the brain. We have investigated the interaction of NA with α-synuclein (α-syn), the major protein constituent of Lewy bodies that are the pathological hallmark of Parkinson's disease (PD). It is expected that NA, like dopamine, could bind to α-syn and modulate its aggregation propensity and kinetics, which could also contribute to the onset of PD. We have, thus, evaluated the thermodynamic parameters of interaction of NA with α-syn monomer as well as species formed at different stages during its fibrillation pathway and have investigated the conformational and aggregation properties using various spectroscopic and calorimetric techniques. Binding isotherms of NA with α-syn species formed at different time points in the pathway have been observed to be exothermic in nature, suggesting hydrogen bonding interactions and weak affinity with binding constants in the millimolar range in all the cases. The interaction site of NA for α-syn was determined using Förster resonance energy transfer measurements that resulted in its binding in close proximity (23 Å) of an Alexa-labeled A90C mutant of α-syn. Docking studies further suggested binding of NA to the C-terminal as well as the non-amyloid-β component (NAC) region of α-syn. We have shown that α-syn oligomerization into sodium dodecyl sulfate resistant, higher-order, β-sheet-rich species is dependent on the oxidation of NA. Under non-reducing conditions, NA was also found to disaggregate the intermediates, populated during the fibrillation pathway, which are more cytotoxic compared to amyloid fibrils, as observed by 3-(4,5-dimethylthiazolyl-2)-2,5-diphenyltetrazolium bromide cytotoxicity assay using a human neuroblastoma cell line. On the basis of these and earlier data, we propose that NA-induced formation of α-syn oligomers may contribute to the progressive loss of the noradrenergic neuronal population and the pronounced Lewy body deposition observed in patients with PD.
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Affiliation(s)
- Priyanka Singh
- School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India
| | - Rajiv Bhat
- School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India
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23
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Marvian AT, Koss DJ, Aliakbari F, Morshedi D, Outeiro TF. In vitro models of synucleinopathies: informing on molecular mechanisms and protective strategies. J Neurochem 2019; 150:535-565. [PMID: 31004503 DOI: 10.1111/jnc.14707] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2019] [Revised: 04/05/2019] [Accepted: 04/12/2019] [Indexed: 02/06/2023]
Abstract
Alpha-synuclein (α-Syn) is a central player in Parkinson's disease (PD) and in a spectrum of neurodegenerative diseases collectively known as synucleinopathies. The protein was first associated with PD just over 20 years ago, when it was found to (i) be a major component of Lewy bodies and (ii) to be also associated with familial forms of PD. The characterization of α-Syn pathology has been achieved through postmortem studies of human brains. However, the identification of toxic mechanisms associated with α-Syn was only achieved through the use of experimental models. In vitro models are highly accessible, enable relatively rapid studies, and have been extensively employed to address α-Syn-associated neurodegeneration. Given the diversity of models used and the outcomes of the studies, a cumulative and comprehensive perspective emerges as indispensable to pave the way for further investigations. Here, we subdivided in vitro models of α-Syn pathology into three major types: (i) models simulating α-Syn fibrillization and the formation of different aggregated structures in vitro, (ii) models based on the intracellular expression of α-Syn, reporting on pathogenic conditions and cellular dysfunctions induced, and (iii) models using extracellular treatment with α-Syn aggregated species, reporting on sites of interaction and their downstream consequences. In summary, we review the underlying molecular mechanisms discovered and categorize protective strategies, in order to pave the way for future studies and the identification of effective therapeutic strategies. This article is part of the Special Issue "Synuclein".
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Affiliation(s)
- Amir Tayaranian Marvian
- Department of Neurology, School of Medicine, Technical University of Munich, Munich, Germany.,Department of Translational Neurodegeneration, German Center for Neurodegenerative Diseases (DZNE), Munich, Germany
| | - David J Koss
- Institute of Neuroscience, The Medical School, Newcastle University, Newcastle Upon Tyne, UK
| | - Farhang Aliakbari
- Department of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran.,Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, Göttingen, Germany
| | - Dina Morshedi
- Department of Industrial and Environmental Biotechnology, National Institute of Genetic Engineering and Biotechnology, Tehran, Iran
| | - Tiago Fleming Outeiro
- Institute of Neuroscience, The Medical School, Newcastle University, Newcastle Upon Tyne, UK.,Department of Experimental Neurodegeneration, Center for Biostructural Imaging of Neurodegeneration, Göttingen, Germany.,University Medical Center Göttingen, Göttingen, Germany.,Max Planck Institute for Experimental Medicine, Göttingen, Germany
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α-Synuclein misfolding and aggregation: Implications in Parkinson's disease pathogenesis. BIOCHIMICA ET BIOPHYSICA ACTA-PROTEINS AND PROTEOMICS 2019; 1867:890-908. [PMID: 30853581 DOI: 10.1016/j.bbapap.2019.03.001] [Citation(s) in RCA: 234] [Impact Index Per Article: 46.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2018] [Revised: 03/03/2019] [Accepted: 03/05/2019] [Indexed: 12/21/2022]
Abstract
α-Synuclein (α-Syn) has been extensively studied for its structural and biophysical properties owing to its pathophysiological role in Parkinson's disease (PD). Lewy bodies and Lewy neurites are the pathological hallmarks of PD and contain α-Syn aggregates as their major component. It was therefore hypothesized that α-Syn aggregation is actively associated with PD pathogenesis. The central role of α-Syn aggregation in PD is further supported by the identification of point mutations in α-Syn protein associated with rare familial forms of PD. However, the correlation between aggregation propensities of α-Syn mutants and their association with PD phenotype is not straightforward. Recent evidence suggested that oligomers, formed during the initial stages of aggregation, are the potent neurotoxic species causing cell death in PD. However, the heterogeneous and unstable nature of these oligomers limit their detailed characterization. α-Syn fibrils, on the contrary, are shown to be the infectious agents and propagate in a prion-like manner. Although α-Syn is an intrinsically disordered protein, it exhibits remarkable conformational plasticity by adopting a range of structural conformations under different environmental conditions. In this review, we focus on the structural and functional aspects of α-Syn and role of potential factors that may contribute to the underlying mechanism of synucleinopathies. This information will help to identify novel targets and develop specific therapeutic strategies to combat Parkinson's and other protein aggregation related neurodegenerative diseases.
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Ganguly U, Ganguly A, Sen O, Ganguly G, Cappai R, Sahoo A, Chakrabarti S. Dopamine Cytotoxicity on SH-SY5Y Cells: Involvement of α-Synuclein and Relevance in the Neurodegeneration of Sporadic Parkinson’s Disease. Neurotox Res 2019; 35:898-907. [DOI: 10.1007/s12640-019-0001-0] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 12/29/2018] [Accepted: 01/08/2019] [Indexed: 12/15/2022]
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Mor DE, Daniels MJ, Ischiropoulos H. The usual suspects, dopamine and alpha-synuclein, conspire to cause neurodegeneration. Mov Disord 2019; 34:167-179. [PMID: 30633814 PMCID: PMC6379109 DOI: 10.1002/mds.27607] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 11/15/2018] [Accepted: 12/03/2018] [Indexed: 01/07/2023] Open
Abstract
Parkinson's disease (PD) is primarily a movement disorder driven by the loss of dopamine-producing neurons in the substantia nigra (SN). Early identification of the oxidative properties of dopamine implicated it as a potential source of oxidative stress in PD, yet few studies have investigated dopamine neurotoxicity in vivo. The discovery of PD-causing mutations in α-synuclein and the presence of aggregated α-synuclein in the hallmark Lewy body pathology of PD revealed another important player. Despite extensive efforts, the precise role of α-synuclein aggregation in neurodegeneration remains unclear. We recently manipulated both dopamine levels and α-synuclein expression in aged mice and found that only the combination of these 2 factors caused progressive neurodegeneration of the SN and an associated motor deficit. Dopamine modified α-synuclein aggregation in the SN, resulting in greater abundance of α-synuclein oligomers and unique dopamine-induced oligomeric conformations. Furthermore, disruption of the dopamine-α-synuclein interaction rescued dopaminergic neurons from degeneration in transgenic Caenorhabditis elegans models. In this Perspective, we discuss these findings in the context of known α-synuclein and dopamine biology, review the evidence for α-synuclein oligomer toxicity and potential mechanisms, and discuss therapeutic implications. © 2019 International Parkinson and Movement Disorder Society.
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Affiliation(s)
- Danielle E. Mor
- Lewis-Sigler Institute for Integrative Genomics and Department of Molecular Biology, Princeton University, Princeton, NJ, USA
| | - Malcolm J. Daniels
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Harry Ischiropoulos
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
- Children’s Hospital of Philadelphia Research Institute, Philadelphia, PA, USA
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Umek N, Geršak B, Vintar N, Šoštarič M, Mavri J. Dopamine Autoxidation Is Controlled by Acidic pH. Front Mol Neurosci 2018; 11:467. [PMID: 30618616 PMCID: PMC6305604 DOI: 10.3389/fnmol.2018.00467] [Citation(s) in RCA: 55] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 12/03/2018] [Indexed: 11/16/2022] Open
Abstract
We studied the reaction mechanism of dopamine autoxidation using quantum chemical methods. Unlike other biogenic amines important in the central nervous system, dopamine and noradrenaline are capable of undergoing a non-enzymatic autoxidative reaction giving rise to a superoxide anion that further decomposes to reactive oxygen species. The reaction in question, which takes place in an aqueous solution, is as such not limited to the mitochondrial membrane where scavenging enzymes such as catalase and superoxide dismutase are located. With the experimental rate constant of 0.147 s−1, the dopamine autoxidation reaction is comparably as fast as the monoamine oxidase B catalyzed dopamine decomposition with a rate constant of 1 s−1. By using quantum chemical calculations, we demonstrated that the rate-limiting step is the formation of a hydroxide ion from a water molecule, which attacks the amino group that enters intramolecular Michael addition, giving rise to a pharmacologically inert aminochrome. We have shown that for dopamine stability on a time scale of days, it is essential that the pH value of the synaptic vesicle interior is acidic. The pathophysiologic correlates of the results are discussed in the context of Parkinson's disease as well as the pathology caused by long-term amphetamine and cocaine administration.
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Affiliation(s)
- Nejc Umek
- Department of Anesthesiology and Surgical Intensive Therapy, University Medical Centre Ljubljana, Ljubljana, Slovenia.,Institute of Anatomy, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Blaž Geršak
- Department of Anesthesiology and Surgical Intensive Therapy, University Medical Centre Ljubljana, Ljubljana, Slovenia
| | - Neli Vintar
- Department of Anesthesiology and Surgical Intensive Therapy, University Medical Centre Ljubljana, Ljubljana, Slovenia.,Department of Anesthesiology and Reanimatology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Maja Šoštarič
- Department of Anesthesiology and Surgical Intensive Therapy, University Medical Centre Ljubljana, Ljubljana, Slovenia.,Department of Anesthesiology and Reanimatology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia
| | - Janez Mavri
- National Institute of Chemistry, Ljubljana, Slovenia
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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.
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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.
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30
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Oxidized DJ-1 Levels in Urine Samples as a Putative Biomarker for Parkinson's Disease. PARKINSONS DISEASE 2018; 2018:1241757. [PMID: 29887985 PMCID: PMC5985070 DOI: 10.1155/2018/1241757] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Accepted: 03/25/2018] [Indexed: 12/29/2022]
Abstract
Parkinson's disease (PD) is the second most common neurodegenerative disease. Oxidative stress is the most critical risk factor for neurodegenerative diseases, including Alzheimer's disease (AD) and Huntington's disease (HD). Numerous reports have demonstrated that oxidative stress aggravates cytotoxicity in dopaminergic neurons and accelerates the formation of protein inclusions. In addition, oxidative stress, such as 4-hydroxynonenal (HNE), oxidized protein, and dopamine quinone, are related to PD progression. DJ-1 is a PD-causative gene, and it plays a pivotal role as a sensor and eliminator of oxidative stress. Several studies have shown that oxidized DJ-1 (OxiDJ-1) formation is induced by oxidative stress. Hence, previous studies suggest that oxidized DJ-1 could be a biomarker for PD. We previously reported higher DJ-1 levels in Korean male PD patient urine exosomes than male non-PD controls. We speculate that OxiDJ-1 levels in PD patient urine might be higher than that in non-PD controls. In this study, we established an ELISA for OxiDJ-1 using recombinant DJ-1 treated with H2O2. Using Western blot assay and ELISA, we confirmed an increase of OxiDJ-1 from HEK293T cells treated with H2O2. Using our ELISA, we observed significantly higher, 2-fold, OxiDJ-1 levels in the urine of Korean PD patients than in non-PD controls.
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31
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Duce JA, Wong BX, Durham H, Devedjian JC, Smith DP, Devos D. Post translational changes to α-synuclein control iron and dopamine trafficking; a concept for neuron vulnerability in Parkinson's disease. Mol Neurodegener 2017; 12:45. [PMID: 28592304 PMCID: PMC5463308 DOI: 10.1186/s13024-017-0186-8] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 06/02/2017] [Indexed: 12/21/2022] Open
Abstract
Parkinson's disease is a multifactorial neurodegenerative disorder, the aetiology of which remains elusive. The primary clinical feature of progressively impaired motor control is caused by a loss of midbrain substantia nigra dopamine neurons that have a high α-synuclein (α-syn) and iron content. α-Syn is a neuronal protein that is highly modified post-translationally and central to the Lewy body neuropathology of the disease. This review provides an overview of findings on the role post translational modifications to α-syn have in membrane binding and intracellular vesicle trafficking. Furthermore, we propose a concept in which acetylation and phosphorylation of α-syn modulate endocytic import of iron and vesicle transport of dopamine during normal physiology. Disregulated phosphorylation and oxidation of α-syn mediate iron and dopamine dependent oxidative stress through impaired cellular location and increase propensity for α-syn aggregation. The proposition highlights a connection between α-syn, iron and dopamine, three pathological components associated with disease progression in sporadic Parkinson's disease.
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Affiliation(s)
- James A Duce
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, West Yorkshire, UK. .,Oxidation Biology Unit, the Florey Institute of Neuroscience and Mental Health, the University of Melbourne, Parkville, VIC, Australia.
| | - Bruce X Wong
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, West Yorkshire, UK.,Oxidation Biology Unit, the Florey Institute of Neuroscience and Mental Health, the University of Melbourne, Parkville, VIC, Australia
| | - Hannah Durham
- School of Biomedical Sciences, Faculty of Biological Sciences, University of Leeds, Leeds, West Yorkshire, UK
| | | | - David P Smith
- Biomolecular Research Centre, Sheffield Hallam University, Howard Street, Sheffield, UK
| | - David Devos
- Department of Medical Pharmacology, Lille University, INSERM U1171, CHU of Lille, Lille, France
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Mechanistic investigation on the electropolymerization of phenol red by cyclic voltammetry and the catalytic reactions toward acetaminophen and dopamine using poly(phenol red)-modified GCE. J Electroanal Chem (Lausanne) 2017. [DOI: 10.1016/j.jelechem.2017.05.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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Scognamiglio F, Travan A, Turco G, Borgogna M, Marsich E, Pasqua M, Paoletti S, Donati I. Adhesive coatings based on melanin-like nanoparticles for surgical membranes. Colloids Surf B Biointerfaces 2017; 155:553-559. [PMID: 28499217 DOI: 10.1016/j.colsurfb.2017.04.057] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 03/24/2017] [Accepted: 04/28/2017] [Indexed: 02/06/2023]
Abstract
Adhesive coatings for implantable biomaterials can be designed to prevent material displacement from the site of implant. In this paper, a strategy based on the use of melanin-like nanoparticles (MNPs) for the development of adhesive coatings for polysaccharidic membranes was devised. MNPs were synthesized in vitro and characterized in terms of dimensions and surface potential, as a function of pH and ionic strength. The in vitro biocompatibility of MNPs was investigated on fibroblast cells, while the antimicrobial properties of MNPs in suspension were evaluated on E. coli and S. aureus cultures. The manufacturing of the adhesive coatings was carried out by spreading MNPs over the surface of polysaccharidic membranes; the adhesive properties of the nano-engineered coating to the target tissue (intestinal serosa) were studied in simulated physiological conditions. Overall, this study opens for novel approaches in the design of naturally inspired nanostructured adhesive systems.
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Affiliation(s)
- Francesca Scognamiglio
- Department of Life Sciences, University of Trieste, Via Licio Giorgieri 5, I-34127, Trieste, Italy.
| | - Andrea Travan
- Department of Life Sciences, University of Trieste, Via Licio Giorgieri 5, I-34127, Trieste, Italy
| | - Gianluca Turco
- Department of Medical, Surgical and Health Sciences, University of Trieste, Piazza dell'Ospitale 1, I-34129 Trieste, Italy
| | - Massimiliano Borgogna
- Department of Life Sciences, University of Trieste, Via Licio Giorgieri 5, I-34127, Trieste, Italy
| | - Eleonora Marsich
- Department of Medical, Surgical and Health Sciences, University of Trieste, Piazza dell'Ospitale 1, I-34129 Trieste, Italy
| | - Mattia Pasqua
- Department of Life Sciences, University of Trieste, Via Licio Giorgieri 5, I-34127, Trieste, Italy
| | - Sergio Paoletti
- Department of Life Sciences, University of Trieste, Via Licio Giorgieri 5, I-34127, Trieste, Italy
| | - Ivan Donati
- Department of Life Sciences, University of Trieste, Via Licio Giorgieri 5, I-34127, Trieste, Italy
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Braconi D, Millucci L, Bernini A, Spiga O, Lupetti P, Marzocchi B, Niccolai N, Bernardini G, Santucci A. Homogentisic acid induces aggregation and fibrillation of amyloidogenic proteins. Biochim Biophys Acta Gen Subj 2017; 1861:135-146. [DOI: 10.1016/j.bbagen.2016.11.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2016] [Revised: 11/11/2016] [Accepted: 11/15/2016] [Indexed: 10/20/2022]
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Structural Characteristics of α-Synuclein Oligomers. INTERNATIONAL REVIEW OF CELL AND MOLECULAR BIOLOGY 2017; 329:79-143. [DOI: 10.1016/bs.ircmb.2016.08.010] [Citation(s) in RCA: 73] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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Amyloid formation of growth hormone in presence of zinc: Relevance to its storage in secretory granules. Sci Rep 2016; 6:23370. [PMID: 27004850 PMCID: PMC4804206 DOI: 10.1038/srep23370] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 03/04/2016] [Indexed: 11/16/2022] Open
Abstract
Amyloids are cross-β-sheet fibrillar aggregates, associated with various human diseases and native functions such as protein/peptide hormone storage inside secretory granules of neuroendocrine cells. In the current study, using amyloid detecting agents, we show that growth hormone (GH) could be stored as amyloid in the pituitary of rat. Moreover, to demonstrate the formation of GH amyloid in vitro, we studied various conditions (solvents, glycosaminoglycans, salts and metal ions) and found that in presence of zinc metal ions (Zn(II)), GH formed short curvy fibrils. The amyloidogenic nature of these fibrils was examined by Thioflavin T binding, Congo Red binding, transmission electron microscopy and X-ray diffraction. Our biophysical studies also suggest that Zn(II) initiates the early oligomerization of GH that eventually facilitates the fibrillation process. Furthermore, using immunofluorescence study of pituitary tissue, we show that GH in pituitary significantly co-localizes with Zn(II), suggesting the probable role of zinc in GH aggregation within secretory granules. We also found that GH amyloid formed in vitro is capable of releasing monomers. The study will help to understand the possible mechanism of GH storage, its regulation and monomer release from the somatotrophs of anterior pituitary.
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Zhao J, Yu S, Zheng Y, Yang H, Zhang J. Oxidative Modification and Its Implications for the Neurodegeneration of Parkinson’s Disease. Mol Neurobiol 2016; 54:1404-1418. [DOI: 10.1007/s12035-016-9743-3] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2015] [Accepted: 01/22/2016] [Indexed: 12/21/2022]
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Changes in secondary structure of α-synuclein during oligomerization induced by reactive aldehydes. Biochem Biophys Res Commun 2015; 464:336-41. [DOI: 10.1016/j.bbrc.2015.06.154] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Accepted: 06/24/2015] [Indexed: 11/18/2022]
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Stabilization of Alpha-Synuclein Oligomers In Vitro by the Neurotransmitters, Dopamine and Norepinephrine: The Effect of Oxidized Catecholamines. Neurochem Res 2015; 40:1341-9. [DOI: 10.1007/s11064-015-1597-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2015] [Revised: 03/20/2015] [Accepted: 04/30/2015] [Indexed: 10/23/2022]
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40
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The N-terminal residues 43 to 60 form the interface for dopamine mediated α-synuclein dimerisation. PLoS One 2015; 10:e0116497. [PMID: 25679387 PMCID: PMC4332483 DOI: 10.1371/journal.pone.0116497] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2014] [Accepted: 12/10/2014] [Indexed: 12/17/2022] Open
Abstract
α-synuclein (α-syn) is a major component of the intracellular inclusions called Lewy bodies, which are a key pathological feature in the brains of Parkinson's disease patients. The neurotransmitter dopamine (DA) inhibits the fibrillisation of α-syn into amyloid, and promotes α-syn aggregation into SDS-stable soluble oligomers. While this inhibition of amyloid formation requires the oxidation of both DA and the methionines in α-syn, the molecular basis for these processes is still unclear. This study sought to define the protein sequences required for the generation of oligomers. We tested N- (α-syn residues 43-140) and C-terminally (1-95) truncated α-syn, and found that similar to full-length protein both truncated species formed soluble DA:α-syn oligomers, albeit 1-95 had a different profile. Using nuclear magnetic resonance (NMR), and the N-terminally truncated α-syn 43-140 protein, we analysed the structural characteristics of the DA:α-syn 43-140 dimer and α-syn 43-140 monomer and found the dimerisation interface encompassed residues 43 to 60. Narrowing the interface to this small region will help define the mechanism by which DA mediates the formation of SDS-stable soluble DA:α-syn oligomers.
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41
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Correlation between the biochemical pathways altered by mutated parkinson-related genes and chronic exposure to manganese. Neurotoxicology 2014; 44:314-25. [DOI: 10.1016/j.neuro.2014.08.006] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2014] [Revised: 08/11/2014] [Accepted: 08/11/2014] [Indexed: 01/02/2023]
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Planchard MS, Exley SE, Morgan SE, Rangachari V. Dopamine-induced α-synuclein oligomers show self- and cross-propagation properties. Protein Sci 2014; 23:1369-79. [PMID: 25044276 DOI: 10.1002/pro.2521] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 07/11/2014] [Indexed: 12/22/2022]
Abstract
Amyloid aggregates of α-synuclein (αS) protein are the predominant species present within the intracellular inclusions called Lewy bodies in Parkinson's disease (PD) patients. Among various aggregates, the low-molecular weight ones broadly ranging between 2 and 30 mers are known to be the primary neurotoxic agents responsible for the impairment of neuronal function. Recent research has indicated that the neurotransmitter dopamine (DA) is one of the key physiological agents promoting and augmenting αS aggregation, which is thought to be a significant event in PD pathologenesis. Specifically, DA is known to induce the formation of soluble oligomers of αS, which in turn are responsible for inducing several important cellular changes leading to cellular toxicity. In this report, we present the generation, isolation, and biophysical characterization of five different dopamine-derived αS oligomers (DSOs) ranging between 3 and 15 mers, corroborating previously published reports. More importantly, we establish that these DSOs are also capable of replication by self-propagation, which leads to the replication of DSOs upon interaction with αS monomers, a process similar to that observed in mammilian prions. In addition, DSOs are also able to cross-propagate amyloid-β (Aβ) aggregates involved in Alzheimer's disease (AD). Interestingly, while self-propagation of DSOs occur with no net gain in protein structure, cross-propagation proceeds with an overall gain in β-sheet conformation. These results implicate the involvement of DSOs in the progression of PD, and, in part, provide a molecular basis for the observed co-existence of AD-like pathology among PD patients.
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Affiliation(s)
- Matthew S Planchard
- Department of Chemistry and Biochemistry, University of Southern Mississippi, Hattiesburg, Mississippi, 39406
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Theillet FX, Binolfi A, Frembgen-Kesner T, Hingorani K, Sarkar M, Kyne C, Li C, Crowley PB, Gierasch L, Pielak GJ, Elcock AH, Gershenson A, Selenko P. Physicochemical properties of cells and their effects on intrinsically disordered proteins (IDPs). Chem Rev 2014; 114:6661-714. [PMID: 24901537 PMCID: PMC4095937 DOI: 10.1021/cr400695p] [Citation(s) in RCA: 338] [Impact Index Per Article: 33.8] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2013] [Indexed: 02/07/2023]
Affiliation(s)
- Francois-Xavier Theillet
- Department
of NMR-supported Structural Biology, In-cell NMR Laboratory, Leibniz Institute of Molecular Pharmacology (FMP Berlin), Robert-Roessle Strasse 10, 13125 Berlin, Germany
| | - Andres Binolfi
- Department
of NMR-supported Structural Biology, In-cell NMR Laboratory, Leibniz Institute of Molecular Pharmacology (FMP Berlin), Robert-Roessle Strasse 10, 13125 Berlin, Germany
| | - Tamara Frembgen-Kesner
- Department
of Biochemistry, University of Iowa, Bowen Science Building, 51 Newton
Road, Iowa City, Iowa 52242, United States
| | - Karan Hingorani
- Departments
of Biochemistry & Molecular Biology and Chemistry, Program in
Molecular & Cellular Biology, University
of Massachusetts, Amherst, 240 Thatcher Way, Amherst, Massachusetts 01003, United States
| | - Mohona Sarkar
- Department
of Chemistry, Department of Biochemistry and Biophysics and Lineberger
Comprehensive Cancer Center, University
of North Carolina, Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Ciara Kyne
- School
of Chemistry, National University of Ireland,
Galway, University Road, Galway, Ireland
| | - Conggang Li
- Key Laboratory
of Magnetic Resonance in Biological Systems, State Key Laboratory
of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Center
for Magnetic Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, 430071, P.R. China
| | - Peter B. Crowley
- School
of Chemistry, National University of Ireland,
Galway, University Road, Galway, Ireland
| | - Lila Gierasch
- Departments
of Biochemistry & Molecular Biology and Chemistry, Program in
Molecular & Cellular Biology, University
of Massachusetts, Amherst, 240 Thatcher Way, Amherst, Massachusetts 01003, United States
| | - Gary J. Pielak
- Department
of Chemistry, Department of Biochemistry and Biophysics and Lineberger
Comprehensive Cancer Center, University
of North Carolina, Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Adrian H. Elcock
- Department
of Biochemistry, University of Iowa, Bowen Science Building, 51 Newton
Road, Iowa City, Iowa 52242, United States
| | - Anne Gershenson
- Departments
of Biochemistry & Molecular Biology and Chemistry, Program in
Molecular & Cellular Biology, University
of Massachusetts, Amherst, 240 Thatcher Way, Amherst, Massachusetts 01003, United States
| | - Philipp Selenko
- Department
of NMR-supported Structural Biology, In-cell NMR Laboratory, Leibniz Institute of Molecular Pharmacology (FMP Berlin), Robert-Roessle Strasse 10, 13125 Berlin, Germany
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Oczkowska A, Kozubski W, Lianeri M, Dorszewska J. Mutations in PRKN and SNCA Genes Important for the Progress of Parkinson's Disease. Curr Genomics 2014; 14:502-17. [PMID: 24532983 PMCID: PMC3924246 DOI: 10.2174/1389202914666131210205839] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2013] [Revised: 11/12/2013] [Accepted: 11/25/2013] [Indexed: 11/30/2022] Open
Abstract
Although Parkinson’s disease (PD) was first described almost 200 years ago, it remains an incurable disease
with a cause that is not fully understood. Nowadays it is known that disturbances in the structure of pathological proteins
in PD can be caused by more than environmental and genetic factors. Despite numerous debates and controversies in the
literature about the role of mutations in the SNCA and PRKN genes in the pathogenesis of PD, it is evident that these
genes play a key role in maintaining dopamine (DA) neuronal homeostasis and that the dysfunction of this homeostasis is
relevant to both familial (FPD) and sporadic (SPD) PD with different onset. In recent years, the importance of alphasynuclein
(ASN) in the process of neurodegeneration and neuroprotective function of the Parkin is becoming better understood.
Moreover, there have been an increasing number of recent reports indicating the importance of the interaction between
these proteins and their encoding genes. Among others interactions, it is suggested that even heterozygous substitution
in the PRKN gene in the presence of the variants +2/+2 or +2/+3 of NACP-Rep1 in the SNCA promoter, may increase
the risk of PD manifestation, which is probably due to ineffective elimination of over-expressed ASN by the mutated
Parkin protein. Finally, it seems that genetic testing may be an important part of diagnostics in patients with PD and may
improve the prognostic process in the course of PD. However, only full knowledge of the mechanism of the interaction
between the genes associated with the pathogenesis of PD is likely to help explain the currently unknown pathways of selective
damage to dopaminergic neurons in the course of PD.
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Affiliation(s)
- Anna Oczkowska
- Laboratory of Neurobiology, Department of Neurology, Poznan University of Medical Sciences, Poznan, Poland
| | - Wojciech Kozubski
- Chair and Department of Neurology, Poznan University of Medical Sciences, Poznan, Poland
| | - Margarita Lianeri
- Department of Biochemistry and Molecular Biology, Poznan University of Medical Sciences, Poznan, Poland
| | - Jolanta Dorszewska
- Laboratory of Neurobiology, Department of Neurology, Poznan University of Medical Sciences, Poznan, Poland
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Fagerqvist T, Näsström T, Ihse E, Lindström V, Sahlin C, Tucker SMF, Kasaryan A, Karlsson M, Nikolajeff F, Schell H, Outeiro TF, Kahle PJ, Lannfelt L, Ingelsson M, Bergström J. Off-pathway α-synuclein oligomers seem to alter α-synuclein turnover in a cell model but lack seeding capability in vivo. Amyloid 2013; 20:233-44. [PMID: 24053224 DOI: 10.3109/13506129.2013.835726] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Aggregated α-synuclein is the major component of Lewy bodies, protein inclusions observed in the brain in neurodegenerative disorders such as Parkinson's disease and dementia with Lewy bodies. Experimental evidence indicates that α-synuclein potentially can be transferred between cells and act as a seed to accelerate the aggregation process. Here, we investigated in vitro and in vivo seeding effects of α-synuclein oligomers induced by the reactive aldehyde 4-oxo-2-nonenal (ONE). As measured by a Thioflavin-T based fibrillization assay, there was an earlier onset of aggregation when α-synuclein oligomers were added to monomeric α-synuclein. In contrast, exogenously added α-synuclein oligomers did not induce aggregation in a cell model. However, cells overexpressing α-synuclein that were treated with the oligomers displayed reduced α-synuclein levels, indicating that internalized oligomers either decreased the expression or accelerated the degradation of transfected α-synuclein. Also in vivo there were no clear seeding effects, as intracerebral injections of α-synuclein oligomers into the neocortex of α-synuclein transgenic mice did not induce formation of proteinase K resistant α-synuclein pathology. Taken together, we could observe a seeding effect of the ONE-induced α-synuclein oligomers in a fibrillization assay, but neither in a cell nor in a mouse model.
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Affiliation(s)
- Therese Fagerqvist
- Department of Public Health/Geriatrics, Rudbeck Laboratory, Uppsala University , Uppsala , Sweden
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46
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The interplay between lipids and dopamine on α-synuclein oligomerization and membrane binding. Biosci Rep 2013; 33:BSR20130092. [PMID: 24066973 PMCID: PMC3804888 DOI: 10.1042/bsr20130092] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The deposition of α-syn (α-synuclein) as amyloid fibrils and the selective loss of DA (dopamine) containing neurons in the substantia nigra are two key features of PD (Parkinson's disease). α-syn is a natively unfolded protein and adopts an α-helical conformation upon binding to lipid membrane. Oligomeric species of α-syn have been proposed to be the pathogenic species associated with PD because they can bind lipid membranes and disrupt membrane integrity. DA is readily oxidized to generate reactive intermediates and ROS (reactive oxygen species) and in the presence of DA, α-syn form of SDS-resistant soluble oligomers. It is postulated that the formation of the α-syn:DA oligomers involves the cross-linking of DA-melanin with α-syn, via covalent linkage, hydrogen and hydrophobic interactions. We investigate the effect of lipids on DA-induced α-syn oligomerization and studied the ability of α-syn:DA oligomers to interact with lipids vesicles. Our results show that the interaction of α-syn with lipids inhibits the formation of DA-induced α-syn oligomers. Moreover, the α-syn:DA oligomer cannot interact with lipid vesicles or cause membrane permeability. Thus, the formation of α-syn:DA oligomers may alter the actions of α-syn which require membrane association, leading to disruption of its normal cellular function.
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Pham CLL, Kirby N, Wood K, Ryan T, Roberts B, Sokolova A, Barnham KJ, Masters CL, Knott RB, Cappai R, Curtain CC, Rekas A. Guanidine hydrochloride denaturation of dopamine-induced α-synuclein oligomers: A small-angle X-ray scattering study. Proteins 2013; 82:10-21. [DOI: 10.1002/prot.24332] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2012] [Revised: 05/10/2013] [Accepted: 05/19/2013] [Indexed: 01/18/2023]
Affiliation(s)
- Chi L. L. Pham
- Department of Pathology and Bio21 Molecular Science and Technology Institute; The University of Melbourne; Victoria 3010 Australia
| | - Nigel Kirby
- SAXS/WAXS Beamline, The Australian Synchrotron; Clayton Victoria 3168 Australia
| | - Kathleen Wood
- Australian Nuclear Science and Technology Organisation (ANSTO); Kirrawee New South Wales 2232 Australia
| | - Timothy Ryan
- The University of Melbourne, Florey Institute of Neuroscience and Mental Health; Victoria 3010 Australia
| | - Blaine Roberts
- The University of Melbourne, Florey Institute of Neuroscience and Mental Health; Victoria 3010 Australia
| | - Anna Sokolova
- Australian Nuclear Science and Technology Organisation (ANSTO); Kirrawee New South Wales 2232 Australia
| | - Kevin J. Barnham
- The University of Melbourne, Florey Institute of Neuroscience and Mental Health; Victoria 3010 Australia
| | - Colin L. Masters
- The University of Melbourne, Florey Institute of Neuroscience and Mental Health; Victoria 3010 Australia
| | - Robert B. Knott
- Australian Nuclear Science and Technology Organisation (ANSTO); Kirrawee New South Wales 2232 Australia
| | - Roberto Cappai
- Department of Pathology and Bio21 Molecular Science and Technology Institute; The University of Melbourne; Victoria 3010 Australia
| | - Cyril C. Curtain
- Department of Pathology and Bio21 Molecular Science and Technology Institute; The University of Melbourne; Victoria 3010 Australia
- The University of Melbourne, Florey Institute of Neuroscience and Mental Health; Victoria 3010 Australia
| | - Agata Rekas
- Australian Nuclear Science and Technology Organisation (ANSTO); Kirrawee New South Wales 2232 Australia
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48
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The albino mutation of tyrosinase alters ocular angiogenic responsiveness. Angiogenesis 2013; 16:639-46. [PMID: 23423728 DOI: 10.1007/s10456-013-9342-0] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2012] [Accepted: 02/11/2013] [Indexed: 01/11/2023]
Abstract
We have observed substantial differences in angiogenic responsiveness in mice and have mapped the genetic loci responsible for these differences. We have found that the albino mutation is one of the loci responsible for such differences. Using B6.A consomic strains, we determined that chromosome 7 bears a locus that inhibits VEGF-induced corneal neovascularization. F2 crosses between B6.A<Chromosome 7> consomic mice and C57BL/6J parents along with AXB and BXA recombinant inbred strains demonstrated highest linkage near the tyrosinase gene. This region was named AngVq4. Congenic animals confirmed this locus, but could not demonstrate that the classical tyrosinase albino (c) mutation was causative because of the existence of additional linked loci in the congenic region. However, in 1970, a second tyrosinase albino mutation (c-2J) arose in the C57BL/6J background at Jackson Labs. Testing this strain (C57BL/6J<c-2J>) demonstrated that the albino mutation is sufficient to completely explain the alteration in angiogenic response that we observed in congenic animals. Thus, we conclude that the classical tyrosinase mutation is responsible for AngVq4. In contrast to the cornea, where pigmented animals exhibit increased angiogenic responsiveness, iris neovascularization was inhibited in pigmented animals. These results may partially explain increased aggressiveness in amelanotic melanoma, as well as ethnic differences in diabetic retinopathy and macular degeneration.
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Wilkaniec A, Strosznajder JB, Adamczyk A. Toxicity of extracellular secreted alpha-synuclein: Its role in nitrosative stress and neurodegeneration. Neurochem Int 2013; 62:776-83. [PMID: 23416621 DOI: 10.1016/j.neuint.2013.02.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 02/01/2013] [Accepted: 02/03/2013] [Indexed: 02/08/2023]
Abstract
It has been demonstrated that both oligomerisation and accumulation of α-synuclein (ASN) are the key molecular processes involved in the pathophysiology of neurodegenerative diseases such as Parkinson's disease, Alzheimer's disease and other synucleinopathies. Alterations of ASN expression and impairment of its degradation can lead to the formation of intracellular deposits of this protein, called Lewy bodies. Overexpressed or misfolded ASN could be secreted to the extracellular space. Today the prion-like transmission of ASN oligomers to neighbouring cells is believed to be responsible for protein modification and propagation of neurodegeneration in the brain. It was presented that oxidative/nitrosative stress may play a key role in ASN secretion and spread of ASN pathology. Moreover, ASN-evoked protein oxidation, nitration and nitrosylation lead to disturbances in synaptic transmission and cell death. The interaction of secreted ASN with other amyloidogenic proteins and its involvement in irreversible mitochondrial disturbances and oxidative stress were also described. A better understanding of the mechanisms of ASN secretion and dysfunction may help to explain the molecular mechanisms of neurodegeneration and may be the basis for the development of novel therapeutic strategies.
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Affiliation(s)
- Anna Wilkaniec
- Mossakowski Medical Research Center, Polish Academy of Sciences, Department of Cellular Signaling, 5 Pawińskiego St., 02-106 Warsaw, Poland.
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50
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da Silva FL, Coelho Cerqueira E, de Freitas MS, Gonçalves DL, Costa LT, Follmer C. Vitamins K interact with N-terminus α-synuclein and modulate the protein fibrillization in vitro. Exploring the interaction between quinones and α-synuclein. Neurochem Int 2012; 62:103-12. [PMID: 23064431 DOI: 10.1016/j.neuint.2012.10.001] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2012] [Revised: 10/01/2012] [Accepted: 10/03/2012] [Indexed: 01/29/2023]
Abstract
In the last decades, a series of compounds, including quinones and polyphenols, has been described as having anti-fibrillogenic action on α-synuclein (α-syn) whose aggregation is associated to the pathogenesis of Parkinson's disease (PD). Most of these molecules act as promiscuous anti-amyloidogenic agents, interacting with the diverse amyloidogenic proteins (mostly unfolded) through non-specific hydrophobic interactions. Herein we investigated the effect of the vitamins K (phylloquinone, menaquinone and menadione), which are 1,4-naphthoquinone (1,4-NQ) derivatives, on α-syn aggregation, comparing them with other anti-fibrillogenic molecules such as quinones, polyphenols and lipophilic vitamins. Vitamins K delayed α-syn fibrillization in substoichiometric concentrations, leading to the formation of short, sheared fibrils and amorphous aggregates, which are less prone to produce leakage of synthetic vesicles. In seeding conditions, menadione and 1,4-NQ significantly inhibited fibrils elongation, which could be explained by their ability to destabilize preformed fibrils of α-syn. Bidimensional NMR experiments indicate that a specific site at the N-terminal α-syn (Gly31/Lys32) is involved in the interaction with vitamins K, which is corroborated by previous studies suggesting that Lys is a key residue in the interaction with quinones. Together, our data suggest that 1,4-NQ, recently showed up by our group as a potential scaffold for designing new monoamine oxidase inhibitors, is also capable to modulate α-syn fibrillization in vitro.
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Affiliation(s)
- Fernanda Luna da Silva
- Department of Physical Chemistry, Institute of Chemistry, Universidade Federal do Rio de Janeiro, Rio de Janeiro 21941-909, Brazil
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