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Mitra R, Premraj L, Khoo TK. Neuromelanin: Its role in the pathogenesis of idiopathic Parkinson's disease and potential as a therapeutic target. Parkinsonism Relat Disord 2023:105448. [PMID: 37236833 DOI: 10.1016/j.parkreldis.2023.105448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/05/2023] [Revised: 05/10/2023] [Accepted: 05/18/2023] [Indexed: 05/28/2023]
Abstract
Parkinson's disease is an increasingly prevalent condition that involves the marked loss of dopaminergic neurons in the substantia nigra pars compacta. These neurons pigmented with neuromelanin along with other regions of the brain are almost exclusively victims of neurodegeneration in the disease. The link between neuromelanin and Parkinson's disease has been widely studied for decades. While many studies have outlined the pigment's neuroprotective function as a potent free radical scavenger, antioxidant, and ion-chelator, it has also been observed to play a role in cell death due to mitochondrial dysfunction and oxidative stress, especially in the parkinsonian disease state. This is due to the damaging effects of neuromelanin precursors, neuromelanin-related ion dysregulation and intra- and extraneuronal neuromelanin accumulation. Current and emerging therapeutic endeavours guided by these pathological processes may include antioxidant therapy, proteostasis enhancement, ion chelation and neuromelanin-targeted immunotherapy to prevent the accumulation, formation and effects of neuromelanin and oxidative neuromelanin precursors. Some of these therapeutic strategies are already in nascent stages, while others have produced mixed results in clinical trials. This review aims to provide an update on how neuromelanin and neuromelanin-related substances may be linked to the pathogenesis of Parkinson's disease and how future therapeutic strategies may be able to hamper or prevent neuromelanin-related pathological processes and ultimately modify disease progression in Parkinson's.
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Affiliation(s)
- Ritoban Mitra
- College of Medicine and Public Health, Flinders University, South Australia, Australia.
| | - Lavienraj Premraj
- School of Medicine & Dentistry, Griffith University, Queensland, Australia
| | - Tien K Khoo
- School of Medicine & Dentistry, Griffith University, Queensland, Australia; Graduate School of Medicine, University of Wollongong, New South Wales, Australia
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Moreno-García A, Kun A, Calero M, Calero O. The Neuromelanin Paradox and Its Dual Role in Oxidative Stress and Neurodegeneration. Antioxidants (Basel) 2021; 10:124. [PMID: 33467040 DOI: 10.3390/antiox10010124] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 01/12/2021] [Accepted: 01/13/2021] [Indexed: 12/12/2022] Open
Abstract
Aging is associated with an increasing dysfunction of key brain homeostasis mechanisms and represents the main risk factor across most neurodegenerative disorders. However, the degree of dysregulation and the affectation of specific pathways set apart normal aging from neurodegenerative disorders. In particular, the neuronal metabolism of catecholaminergic neurotransmitters appears to be a specifically sensitive pathway that is affected in different neurodegenerations. In humans, catecholaminergic neurons are characterized by an age-related accumulation of neuromelanin (NM), rendering the soma of the neurons black. This intracellular NM appears to serve as a very efficient quencher for toxic molecules. However, when a neuron degenerates, NM is released together with its load (many undegraded cellular components, transition metals, lipids, xenobiotics) contributing to initiate and worsen an eventual immune response, exacerbating the oxidative stress, ultimately leading to the neurodegenerative process. This review focuses on the analysis of the role of NM in normal aging and neurodegeneration related to its capabilities as an antioxidant and scavenging of harmful molecules, versus its involvement in oxidative stress and aberrant immune response, depending on NM saturation state and its extracellular release.
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Calabrese V, Santoro A, Trovato Salinaro A, Modafferi S, Scuto M, Albouchi F, Monti D, Giordano J, Zappia M, Franceschi C, Calabrese EJ. Hormetic approaches to the treatment of Parkinson's disease: Perspectives and possibilities. J Neurosci Res 2018; 96:1641-1662. [PMID: 30098077 DOI: 10.1002/jnr.24244] [Citation(s) in RCA: 62] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Revised: 03/21/2018] [Accepted: 03/21/2018] [Indexed: 01/17/2023]
Abstract
Age-related changes in the brain reflect a dynamic interaction of genetic, epigenetic, phenotypic, and environmental factors that can be temporally restricted or more longitudinally present throughout the lifespan. Fundamental to these mechanisms is the capacity for physiological adaptation through modulation of diverse molecular and biochemical signaling occurring from the intracellular to the network-systemic level throughout the brain. A number of agents that affect the onset and progression of Parkinson's disease (PD)-like effects in experimental models exhibit temporal features, and mechanisms of hormetic dose responses. These findings have particular significance since the hormetic dose response describes the amplitude and range of potential therapeutic effects, thereby affecting the design and conduct of studies of interventions against PD (and other neurodegenerative diseases), and may also be important to a broader consideration of hormetic processes in resilient adaptive responses that might afford protection against the onset and/or progression of PD and related disorders.
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Affiliation(s)
- Vittorio Calabrese
- Department of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania.,IBREGENS, Nutraceuticals and Functional Food Biotechnologies Research Associated, University of Catania, Italy
| | - Aurelia Santoro
- Department of Experimental, Diagnostic and Specialty Medicine (DIMES), University of Bologna, Bologna, Italy
| | - Angela Trovato Salinaro
- Department of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania
| | - Sergio Modafferi
- Department of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania
| | - Maria Scuto
- Department of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania
| | - Ferdaous Albouchi
- Department of Biomedical and Biotechnological Sciences, School of Medicine, University of Catania, Catania
| | - Daniela Monti
- Department of Experimental, Clinical and Biomedical Sciences "Mario Serio", University of Florence, Florence, Italy
| | - James Giordano
- Departments of Neurology and Biochemistry, and Neuroethics Studies Program, Georgetown University Medical Center, Washington, District of Columbia, USA
| | - Mario Zappia
- Department of Medical Sciences, Surgical and Advanced Technologies G.F. Ingrassia, Section of Neurosciences, University of Catania, Italy
| | | | - Edward J Calabrese
- Environmental Health Sciences Division, School of Public Health, University of Massachusetts, Amherst, Massachusetts, USA
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Abstract
Sensitive detection of total iron content from cells, rodent and human brain extracts. There are regional differences in iron concentrations in rodent and human brain. Iron dyshomeostasis in the substantia nigra correlates with Lewy body disease. Iron imaging studies may aid in clinical diagnosis and/or serve as biomarker for disease progression.
Iron levels in the healthy human brain are known to be high in certain areas such as the substantia nigra (SN), and increase further with age. In addition, there is some evidence for a further increase in iron load in the SN of Parkinsońs disease (PD) patients as compared to controls, which correlates with motor disability. Here, we have analyzed total iron levels in cells as well as mouse and human brain samples by atomic absorption spectroscopy (AAS). Our data indicate that iron load is more pronounced in cells with dopaminergic features. Moreover, region-specific differences in iron load reflecting those in the human brain were detected in rodent brains as well. Whilst altered iron load was not observed in other regions also affected in PD patients, we report a significant increase in iron load in the SN of Lewy body disease patients as compared to Alzheimeŕs disease (AD) patients or controls, which correlates with neurodegeneration in this brain area.
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Affiliation(s)
- Belén Fernández
- Institute of Parasitology and Biomedicine “López-Neyra”, Consejo Superior de Investigaciones Científicas (CSIC), Avda del Conocimiento s/n, 18016 Granada, Spain
| | - Isidro Ferrer
- Institute of Neuropathology, IDIBELL-University Hospital Bellvitge, University of Barcelona, Llobregat, Spain
| | - Fernando Gil
- Dept. of Legal Medicine and Toxicology, School of Medicine, University of Granada, Granada, Spain
| | - Sabine Hilfiker
- Institute of Parasitology and Biomedicine “López-Neyra”, Consejo Superior de Investigaciones Científicas (CSIC), Avda del Conocimiento s/n, 18016 Granada, Spain
- Corresponding author.
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Wang H, Xu YS, Wang ML, Cheng C, Bian R, Yuan H, Wang Y, Guo T, Zhu LL, Zhou H. Protective effect of naringin against the LPS-induced apoptosis of PC12 cells: Implications for the treatment of neurodegenerative disorders. Int J Mol Med 2017; 39:819-830. [PMID: 28260042 PMCID: PMC5360435 DOI: 10.3892/ijmm.2017.2904] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2016] [Accepted: 02/10/2017] [Indexed: 01/01/2023] Open
Abstract
Several studies have demonstrated that increased apoptosis plays an essential role in neurodegenerative disorders. It has been demonstrated that lipopolysaccharide (LPS) induces apoptosis largely through the production of intracellular reactive oxygen species (ROS) and inflammatory mediators. In this study, we investigated the potential protective mechanisms of naringin (Nar), a pummelo peel extract, on LPS-induced PC12 cell apoptosis. Nar pre-conditioning prior to stimulation with LPS for 18 h was a prerequisite for evaluating PC12 cell viability and the protective mechanisms of Nar. Nar significantly improved cell survival in a time- and concentration-dependent manner. On the one hand, Nar downregulated cytochrome P450 2E1 (CYP2E1), inhibited the release of ROS, mitigated the stimulation of oxidative stress, and rectified the antioxidant protein contents of nuclear factor erythroid 2-related factor 2 (Nrf2), heme oxygenase-1 (HO-1), superoxide dismutase (SOD)2 and glutathione synthetase (GSS). On the other hand, Nar down-regulated inflammatory gene and protein expression, including interleukin (IL)-1β, IL-6, tumor necrosis factor (TNF)-α, HMGB1, high mobility group box 1 protein (HMGB1), cyclo-oxygenase-2 (COX-2), the Toll-like receptor 4 (TLR4)-myeloid differentiation factor 88 (MyD88)-TNF receptor-associated factor 6 (TRAF6) path way and downstream mitogen activated protein kinase (MAPK) phosphorylation, activator protein transcription factor-1 (AP-1) and nuclear factor (NF)-κB. Moroever, Nar markedly attenuated the cytochrome c shift from the mitochondria to the cytosol and regulated caspase-3-related protein expression. To the best of our knowledge, this is the first study to report the antioxidant, anti-inflammatory and anti-apoptotic effects of Nar in neuronal-like PC12 cells. These results suggest that Nar can be utilized as a potential drug for the treatment of neurodegenerative disorders.
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Affiliation(s)
- Hui Wang
- Department of Neurosurgery, Traffic Hospital of Shandong Province, Jinan, Shandong 250031, P.R. China
| | - You Song Xu
- Department of Neurosurgery, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
| | - Miao Lin Wang
- Department of Neurosurgery, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
| | - Chao Cheng
- Department of Neurosurgery, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
| | - Rui Bian
- Department of Neurosurgery, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
| | - Hao Yuan
- Department of Neurosurgery, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
| | - Yi Wang
- Department of Neurosurgery, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
| | - Ting Guo
- Department of Neurosurgery, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
| | - Lin Lin Zhu
- Department of Neurosurgery, The First Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116011, P.R. China
| | - Hang Zhou
- Department of Neurosurgery, The 2nd Affiliated Hospital of Dalian Medical University, Dalian, Liaoning 116027, P.R. China
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Jia JJ, Zeng XS, Yang LH, Bai J. The epinephrine increases tyrosine hydroxylase expression through upregulating thioredoxin-1 in PC12 cells. Biochimie 2015; 115:52-8. [PMID: 25957836 DOI: 10.1016/j.biochi.2015.04.022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2014] [Accepted: 04/27/2015] [Indexed: 11/20/2022]
Abstract
Epinephrine is a stress hormone which is sharply increased in response to acute stress and is continuously elevated during persistent stress. Thioredoxin-1 (Trx-1) is a redox regulating protein and is induced under various stresses. Our previous study has shown that epinephrine induces the expression of Trx-1. Tyrosine hydroxylase (TH) is the major rate-limiting enzyme in catecholamine biosynthesis in response to stress. However, how TH is regulated by epinephrine is still unknown. In the present study, we found that epinephrine increased the expression of TH in a dose- and time-dependent manner in PC12 cells, which was inhibited by propranolol (β-adrenergic receptor inhibitor), but not by phenoxybenzamine (α-adrenergic receptor inhibitor). The increase of TH was also inhibited by SQ22536 (adenylyl cyclase inhibitor), H-89(PKA inhibitor) and LY294002 (phosphatidylinositol 3 kinase inhibitor). More importantly, overexpression of Trx-1 significantly enhanced the expression of TH, while Trx-1 siRNA suppressed TH expression induced by epinephrine. These results suggest that Trx-1 is involved in TH expression induced by epinephrine in PC12 cells.
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Affiliation(s)
- Jin-Jing Jia
- Laboratory of Molecular Neurobiology, Medical Faculty, Kunming University of Science and Technology, Kunming 650500, China
| | - Xian-Si Zeng
- Laboratory of Molecular Neurobiology, Medical Faculty, Kunming University of Science and Technology, Kunming 650500, China
| | - Li-Hua Yang
- Laboratory of Molecular Neurobiology, Medical Faculty, Kunming University of Science and Technology, Kunming 650500, China
| | - Jie Bai
- Laboratory of Molecular Neurobiology, Medical Faculty, Kunming University of Science and Technology, Kunming 650500, China.
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Affiliation(s)
- Sylvain Dubey
- Department of Ecology and Evolution; University of Lausanne; Biophore Lausanne Switzerland
| | - Alexandre Roulin
- Department of Ecology and Evolution; University of Lausanne; Biophore Lausanne Switzerland
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