1
|
Niu Y, Pan Y, Wang Y, Fu Y, Zhao Z, Kang L. Lead specifically declines tyrosine hydroxylase activity to induce the onset of Parkinson's disease through disrupting dopamine biosynthesis in fly models. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 356:124383. [PMID: 38897282 DOI: 10.1016/j.envpol.2024.124383] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2024] [Revised: 06/01/2024] [Accepted: 06/16/2024] [Indexed: 06/21/2024]
Abstract
Parkinson's disease (PD) is one of the fastest-growing neurodegenerative diseases and has been linked to the exposure to numerous environmental neurotoxins. Although lead (Pb) exposure has been related to the development of PD, the molecular target of Pb to cause the onset of PD is insufficiently investigated. Herein, we explored the effects of Pb exposure on behavior, pathophysiology, and gene expression of wild-type (WT) fly (Drosophila melanogaster) by comparison with its PD model. After exposure to Pb, the WT flies showed PD-like locomotor impairments and selective loss of dopaminergic (DAergic) neurons, displaying similar phenotypes to fly PD model (PINK1). Transcriptomic analysis showed the similarity in gene expression profiles between Pb treatment WT flies and PINK1 mutant flies. Moreover, Pb exposure resulted in endogenous dopamine deficits in WT flies. Analyses of gene expression and enzyme activity confirmed that Pb exposure reduced tyrosine hydroxylase (TH) activity and led to failure of dopamine synthesis. Furthermore, molecular dynamics simulation confirmed that Pb was adsorbed by TH and subsequently inhibited the enzymatic activity. Exogenous injection of L-dopa and melatonin could partially rescue the pathological phenotypes of Pb-exposed flies and PD fly model. Antagonist injection of microRNA-133, which negatively regulated the expression of TH gene, ultimately rescued in the manifestation of PD phenotypes in flies. Involvement of TH overexpression mutants of fly strongly promoted the resistance to Pb exposure and rescued both behavior and the number of DAergic neurons. Therefore, our study elucidates the Pb molecular target in dopamine pathway and mechanism underlying the risks of Pb exposure on the occurrence of PD at environmentally-relevant concentrations.
Collapse
Affiliation(s)
- Yue Niu
- Institute of Life Science and Green Development, College of Life Science, Hebei University, Baoding 30023, China
| | - Yifan Pan
- Institute of Life Science and Green Development, College of Life Science, Hebei University, Baoding 30023, China
| | - Yaqi Wang
- Institute of Life Science and Green Development, College of Life Science, Hebei University, Baoding 30023, China
| | - Yongqi Fu
- Institute of Life Science and Green Development, College of Life Science, Hebei University, Baoding 30023, China
| | - Zhangwu Zhao
- Institute of Life Science and Green Development, College of Life Science, Hebei University, Baoding 30023, China
| | - Le Kang
- Institute of Life Science and Green Development, College of Life Science, Hebei University, Baoding 30023, China; State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, China.
| |
Collapse
|
2
|
Cheng H, Villahoz BF, Ponzio RD, Aschner M, Chen P. Signaling Pathways Involved in Manganese-Induced Neurotoxicity. Cells 2023; 12:2842. [PMID: 38132161 PMCID: PMC10742340 DOI: 10.3390/cells12242842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Revised: 12/07/2023] [Accepted: 12/08/2023] [Indexed: 12/23/2023] Open
Abstract
Manganese (Mn) is an essential trace element, but insufficient or excessive bodily amounts can induce neurotoxicity. Mn can directly increase neuronal insulin and activate insulin-like growth factor (IGF) receptors. As an important cofactor, Mn regulates signaling pathways involved in various enzymes. The IGF signaling pathway plays a protective role in the neurotoxicity of Mn, reducing apoptosis in neurons and motor deficits by regulating its downstream protein kinase B (Akt), mitogen-activated protein kinase (MAPK), and mammalian target of rapamycin (mTOR). In recent years, some new mechanisms related to neuroinflammation have been shown to also play an important role in Mn-induced neurotoxicity. For example, DNA-sensing receptor cyclic GMP-AMP synthase (cCAS) and its downstream signal efficient interferon gene stimulator (STING), NOD-like receptor family pyrin domain containing 3(NLRP3)-pro-caspase1, cleaves to the active form capase1 (CASP1), nuclear factor κB (NF-κB), sirtuin (SIRT), and Janus kinase (JAK) and signal transducers and activators of the transcription (STAT) signaling pathway. Moreover, autophagy, as an important downstream protein degradation pathway, determines the fate of neurons and is regulated by these upstream signals. Interestingly, the role of autophagy in Mn-induced neurotoxicity is bidirectional. This review summarizes the molecular signaling pathways of Mn-induced neurotoxicity, providing insight for further understanding of the mechanisms of Mn.
Collapse
Affiliation(s)
| | | | | | | | - Pan Chen
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, USA; (H.C.); (B.F.V.); (R.D.P.); (M.A.)
| |
Collapse
|
3
|
Aluko OM, Lawal SA, Ijomone OM, Aschner M. Perturbed MAPK signaling in ASD: Impact of metal neurotoxicity. CURRENT OPINION IN TOXICOLOGY 2021; 26:1-7. [PMID: 34263087 DOI: 10.1016/j.cotox.2021.03.009] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The mitogen-activated protein kinase (MAPK) pathways are intracellular signaling pathways necessary for regulating various physiological processes, including neurodevelopment. The developing brain is vulnerable to toxic substances, and metals, such as lead, mercury, nickel, manganese, and others, have been proven to induce disturbances in the MAPK signaling pathway. Since a well-regulated MAPK is necessary for normal neurodevelopment, perturbation of the MAPK pathway results in neurodevelopmental disorders, including autism spectrum disorder (ASD). ASD affects brain parts responsible for communication, cognition, social interaction, and other patterned behaviors. Several studies have addressed the role of metals in the etiopathogenesis of ASD. Here, we briefly review the MAPK signaling pathway and its role in neurodevelopment. Furthermore, we highlight the role of metal toxicity in the development of ASD and how perturbed MAPK signaling may result in ASD.
Collapse
Affiliation(s)
- Oritoke M Aluko
- The Neuro- Lab, School of Health and Health Technology, Federal University of Technology, Akure, Nigeria.,Department of Physiology, School of Health and Health Technology, Federal University of Technology, Akure, Nigeria
| | - Saheed A Lawal
- Department of Physiology, School of Health and Health Technology, Federal University of Technology, Akure, Nigeria
| | - Omamuyovwi M Ijomone
- The Neuro- Lab, School of Health and Health Technology, Federal University of Technology, Akure, Nigeria.,Department of Human Anatomy, School of Health and Health Technology, Federal University of Technology, Akure, Nigeria
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA.,Department of Pediatrics, Albert Einstein College of Medicine, Bronx, NY, USA.,Department of Neuroscience, Albert Einstein College of Medicine, Bronx, NY, USA
| |
Collapse
|
4
|
Heinrich IA, Freitas AE, Wolin IAV, Nascimento APM, Walz R, Rodrigues ALS, Leal RB. Neuronal activity regulated pentraxin (narp) and GluA4 subunit of AMPA receptor may be targets for fluoxetine modulation. Metab Brain Dis 2021; 36:711-722. [PMID: 33528752 DOI: 10.1007/s11011-021-00675-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/21/2020] [Accepted: 01/22/2021] [Indexed: 12/28/2022]
Abstract
Fluoxetine is the foremost prescribed antidepressant. Drugs acting on monoaminergic system may also regulate glutamatergic system. Indeed, the investigation of proteins associated with this system, such as Narp (neuronal activity-dependent pentraxin) and GluA4 subunit of AMPA receptor may reveal poorly explored modulations triggered by conventional antidepressants. This study aimed to uncover neurochemical mechanisms underlying the chronic fluoxetine treatment, mainly by evaluating these protein targets in the prefrontal cortex and in the hippocampus. Mice received a daily administration of fluoxetine (0.1, 1 or 10 mg/kg, p.o.) or potable water (vehicle group) for 21 days. These animals were submitted to the forced swim test (FST) to verify antidepressant-like responses and the open-field test (OFT) to assess locomotor activity. Modulation of signaling proteins was analyzed by western blot. Chronic treatment with fluoxetine (1 and 10 mg/kg) was effective, since it reduced the immobility time in the FST, without altering locomotor activity. Fluoxetine 10 mg/kg increased CREB phosphorylation and BDNF expression in the prefrontal cortex and hippocampus. Noteworthy, in the hippocampus fluoxetine also promoted Akt activation and augmented Narp expression. In the prefrontal cortex, a significant decrease in the expression of the GluA4 subunit and Narp were observed following fluoxetine administration (10 mg/kg). The results provide evidence of novel molecular targets potentially involved in the antidepressant effects of fluoxetine, since in mature rodents Narp and GluA4 are mainly expressed in the GABAergic parvalbumin-positive (PV+) interneurons. This may bring new insights into the molecular elements involved in the mechanisms underlying the antidepressant effects of fluoxetine.
Collapse
Affiliation(s)
- Isabella A Heinrich
- Graduate Program in Neuroscience, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
| | - Andiara E Freitas
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Graduate Program in Biochemistry, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
| | - Ingrid A V Wolin
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Graduate Program in Biochemistry, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
| | - Ana Paula M Nascimento
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Graduate Program in Biochemistry, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
| | - Roger Walz
- Graduate Program in Neuroscience, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Department of Clinical Medicine, Center of Health Sciences, University Hospital, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Center of Applied Neuroscience (CeNAp), University Hospital, Federal University of Santa Catarina, Florianópolis, 88040-900, SC, Brazil
| | - Ana Lúcia S Rodrigues
- Graduate Program in Neuroscience, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
- Graduate Program in Biochemistry, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil
| | - Rodrigo B Leal
- Graduate Program in Neuroscience, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil.
- Department of Biochemistry, Center of Biological Sciences, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil.
- Graduate Program in Biochemistry, Federal University of Santa Catarina, Campus Universitário, Trindade, Florianópolis, 88040-900, SC, Brazil.
| |
Collapse
|
5
|
Martins AC, Morcillo P, Ijomone OM, Venkataramani V, Harrison FE, Lee E, Bowman AB, Aschner M. New Insights on the Role of Manganese in Alzheimer's Disease and Parkinson's Disease. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:E3546. [PMID: 31546716 PMCID: PMC6801377 DOI: 10.3390/ijerph16193546] [Citation(s) in RCA: 48] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 09/19/2019] [Accepted: 09/20/2019] [Indexed: 12/11/2022]
Abstract
Manganese (Mn) is an essential trace element that is naturally found in the environment and is necessary as a cofactor for many enzymes and is important in several physiological processes that support development, growth, and neuronal function. However, overexposure to Mn may induce neurotoxicity and may contribute to the development of Alzheimer's disease (AD) and Parkinson's disease (PD). The present review aims to provide new insights into the involvement of Mn in the etiology of AD and PD. Here, we discuss the critical role of Mn in the etiology of these disorders and provide a summary of the proposed mechanisms underlying Mn-induced neurodegeneration. In addition, we review some new therapy options for AD and PD related to Mn overload.
Collapse
Affiliation(s)
- Airton Cunha Martins
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, USA (P.M.)
| | - Patricia Morcillo
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, USA (P.M.)
| | - Omamuyovwi Meashack Ijomone
- Department of Human Anatomy, School of Health and Health Technology, Federal University of Technology Akure, Akure 340252, Nigeria;
| | - Vivek Venkataramani
- Department of Hematology and Medical Oncology and Institute of Pathology, University Medical Center Göttingen (UMG), 37075 Göttingen, Germany;
| | - Fiona Edith Harrison
- Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37232, USA;
| | - Eunsook Lee
- Department of Pharmaceutical Sciences, Florida A&M University, Tallahassee, FL 32301, USA;
| | - Aaron Blaine Bowman
- School of Health Sciences, Purdue University, West Lafayette, IN 47907-2051, USA;
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY 10461, USA (P.M.)
| |
Collapse
|
6
|
Affiliation(s)
- Jiao Li
- Department of Hygiene Toxicology, School of Public Health, Zunyi Medical College, Zunyi, P.R. China
- The second people’s Hospital of Qixingguan District, Bijie, Guizhou, P.R. China
| | - Yuyan Cen
- Department of Hygiene Toxicology, School of Public Health, Zunyi Medical College, Zunyi, P.R. China
| | - Yan Li
- Department of Hygiene Toxicology, School of Public Health, Zunyi Medical College, Zunyi, P.R. China
| |
Collapse
|
7
|
You Q, Li H, Liu Y, Xu Y, Miao S, Yao G, Xue Y, Geng J, Jin X, Meng H. MicroRNA-650 targets inhibitor of growth 4 to promote colorectal cancer progression via mitogen activated protein kinase signaling. Oncol Lett 2018; 16:2326-2334. [PMID: 30008936 PMCID: PMC6036455 DOI: 10.3892/ol.2018.8910] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2017] [Accepted: 11/29/2017] [Indexed: 12/11/2022] Open
Abstract
Colorectal cancer (CRC) is the third most common malignant disease globally and causes numerous cancer-associated mortalities; however, the underlying molecular mechanisms remain unresolved. MicroRNAs (miRs) are endogenous noncoding RNAs that regulate post-transcriptional gene silencing by annealing to partially complementary sequences in the 3′-untranslated regions of target mRNAs. In the present study, expression of the tumor suppressor gene inhibitor of growth protein 4 (ING4) in cell lines was investigated using reverse transcription-quantitative polymerase chain reaction and western blotting. miR-650 overexpression promoted CRC cell proliferation and migration by targeting ING4 when the cells were transfected with the miR-650 mimics. Additionally, overexpression of miR-650 increased the epithelial-mesenchymal transition and activation of the Ras homolog gene family member A/Ras-related C3 botulinum toxin GTPase. Extracellular signal-regulated kinases and p38 mitogen-activated protein kinase signaling were markedly activated when miR-650 was increased in CRC cells. Combined, the results indicate the mechanism underlying the miR-650 promotion of CRC progression, and provide promising potential biomarkers for the prognosis and treatment of CRC.
Collapse
Affiliation(s)
- Qi You
- Department of Pathology, Basic Research College, Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China.,Department of Gastroenterology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Huining Li
- Department of Pathology, Basic Research College, Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China.,Department of Pathology, The First Affiliated Hospital of Heilongjiang University of Chinese Medicine, Harbin, Heilongjiang 150081, P.R. China
| | - Yao Liu
- Department of Otolaryngology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Yangyang Xu
- Department of Urology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Susheng Miao
- Department of Otolaryngology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Guodong Yao
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Yingwei Xue
- Department of Gastroenterology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Jingshu Geng
- Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| | - Xiaoming Jin
- Department of Pathology, Basic Research College, Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China
| | - Hongxue Meng
- Department of Pathology, Basic Research College, Harbin Medical University, Harbin, Heilongjiang 150081, P.R. China.,Department of Pathology, Harbin Medical University Cancer Hospital, Harbin, Heilongjiang 150081, P.R. China
| |
Collapse
|
8
|
Wang L, Fu H, Liu B, Liu X, Chen W, Yu X. The effect of postnatal manganese exposure on the NMDA receptor signaling pathway in rat hippocampus. J Biochem Mol Toxicol 2017; 31. [PMID: 29205667 DOI: 10.1002/jbt.21969] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2017] [Revised: 07/14/2017] [Accepted: 07/20/2017] [Indexed: 11/11/2022]
Abstract
Overexposure to manganese (Mn) is associated with neurological disorders in children. Evidence indicated that N-methyl-d-aspartate (NMDA) receptor signaling pathway was critical for neurobehavioral function. However, whether NMDA receptor signaling pathway contributes to Mn-induced neurotoxicity remains unknown. In this study, newborn Sprague-Dawley rats were randomly assigned to four groups exposed to 0, 10, 20, and 30 mg/kg of Mn2+ by intraperitoneal injection (n = 10/group: five males and five females). After 3 weeks of Mn exposure, messenger RNA (mRNA) and protein expression of NMDA receptor subunits (NR1, NR2A, and NR2B), cAMP-response element binding protein (CREB), and brain-derived neurotrophic factor (BDNF) in hippocampus were measured by real-time quantitative RT-PCR and Western blot. In Mn-exposed rats, decreased mRNA and protein expression of NR1, NR2A, and NR2B, CREB, and BDNF was observed. The results imply that downregulated NMDA receptor signaling pathway may be of vital importance in the neuropathological process of Mn-induced neurotoxicity.
Collapse
Affiliation(s)
- Lei Wang
- Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Ministry of Education Shanghai Key Laboratory of Children's Environmental Health, Shanghai 200127, China, Shanghai, 200127, China
| | - HuanHuan Fu
- Department of Hematology and Oncology, Children's Hospital of Fudan University, Shanghai, 201102, China
| | - Bin Liu
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - XiaoYan Liu
- College of Food Science, Fujian Agriculture and Forestry University, Fuzhou, 350002, China
| | - WeiWei Chen
- Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Ministry of Education Shanghai Key Laboratory of Children's Environmental Health, Shanghai 200127, China, Shanghai, 200127, China
| | - XiaoDan Yu
- Department of Developmental and Behavioral Pediatrics, Shanghai Children's Medical Center, Shanghai Jiao Tong University School of Medicine, Ministry of Education Shanghai Key Laboratory of Children's Environmental Health, Shanghai 200127, China, Shanghai, 200127, China
| |
Collapse
|
9
|
Peres TV, Ong LK, Costa AP, Eyng H, Venske DKR, Colle D, Gonçalves FM, Lopes MW, Farina M, Aschner M, Dickson PW, Dunkley PR, Leal RB. Tyrosine hydroxylase regulation in adult rat striatum following short-term neonatal exposure to manganese. Metallomics 2017; 8:597-604. [PMID: 26790482 DOI: 10.1039/c5mt00265f] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Manganese (Mn) is an essential trace element required for a range of physiological processes, but Mn can also be neurotoxic especially during development. Excess levels of Mn accumulate preferentially in the striatum and can induce a syndrome called manganism, characterized by an initial stage of psychiatric disorder followed by motor impairment. In the present study, we investigated the effects of Mn exposure on the developing dopaminergic system, specifically tyrosine hydroxylase (TH) protein and phosphorylation levels in the striatum of rats. Neonatal rats were exposed to Mn intraperitoneally (ip) from post-natal day 8 up to day 12 (PND8-12). Striatal tissue was analysed on PND14 or PND70, to detect either short-term or long-term effects induced by Mn exposure. There was a dose dependent increase in TH protein levels in the striatum at PND14, reaching significance at 20 mg kg(-1) Mn, and this correlated with an increase in TH phosphorylation at serines 40, 31 and 19. However, in the striatum at PND70, a time by which Mn levels were no longer elevated, there was a dose dependent decrease in TH protein levels, reaching significance at 20 mg kg(-1) Mn, and this correlated with TH phosphorylation at Ser40 and Ser19. There was however a significant increase in phosphorylation of TH at serine 31 at 20 mg kg(-1) Mn, which did not correlate with TH protein levels. Taken together our findings suggest that neonatal Mn exposure can have both short-term and long-term effects on the regulation of TH in the striatal dopaminergic system.
Collapse
Affiliation(s)
- Tanara V Peres
- Programa de Pós-graduação em Neurociências, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil. and Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Lin K Ong
- School of Biomedical Sciences and Pharmacy and Hunter Medical Research Institute, University of Newcastle, NSW, Australia
| | - Ana Paula Costa
- Programa de Pós-graduação em Neurociências, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil.
| | - Helena Eyng
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Débora K R Venske
- Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Dirleise Colle
- Programa de Pós-graduação em Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Filipe M Gonçalves
- Programa de Pós-graduação em Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Mark W Lopes
- Programa de Pós-graduação em Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Marcelo Farina
- Programa de Pós-graduação em Neurociências, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil. and Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil and Programa de Pós-graduação em Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, NY, USA
| | - Phillip W Dickson
- School of Biomedical Sciences and Pharmacy and Hunter Medical Research Institute, University of Newcastle, NSW, Australia
| | - Peter R Dunkley
- School of Biomedical Sciences and Pharmacy and Hunter Medical Research Institute, University of Newcastle, NSW, Australia
| | - Rodrigo B Leal
- Programa de Pós-graduação em Neurociências, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil. and Departamento de Bioquímica, Centro de Ciências Biológicas, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil and Programa de Pós-graduação em Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| |
Collapse
|
10
|
Abstract
Manganese (Mn) is an essential trace element, serving as a cofactor for several enzymes involved in various cellular and biochemical reactions in human body. However, chronic overexposure to Mn from occupational or environmental sources induces a neurological disorder, characterized by psychiatric, cognitive, and motor abnormalities, referred to as manganism. Mn-induced neurotoxicity is known to target astrocytes since these cells preferentially accumulate Mn. Astrocytes are the most abundant non-neuronal glial cells in the brain, and they play a critical role in maintaining the optimal glutamate levels to prevent excitotoxic death. The fine regulation of glutamate in the brain is accomplished by two major glutamate transporters - glutamate transporter-1 (GLT-1) and glutamate aspartate transporter (GLAST) that are predominantly expressed in astrocytes. Excitotoxic neuronal injury has been demonstrated as a critical mechanism involved in Mn neurotoxicity and implicated in the pathological signs of multiple neurodegenerative diseases including Alzheimer's disease, Parkinson's disease, and amyotrophic lateral sclerosis. Recent evidences also establish that Mn directly deregulates the expression and function of both astrocytic glutamate transporters by decreasing mRNA and protein levels of GLT-1 and GLAST. Herein, we will review the mechanisms of Mn-induced gene regulation of glutamate transporters at the transcriptional level and their role in Mn toxicity.
Collapse
|
11
|
Kim S, Ahn SH, Yang HY, Lee JS, Choi HG, Park YK, Lee TH. Modification of cysteine 457 in plakoglobin modulates the proliferation and migration of colorectal cancer cells by altering binding to E-cadherin/catenins. Redox Rep 2016; 22:272-281. [PMID: 27571934 DOI: 10.1080/13510002.2016.1215120] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
OBJECTIVES In tissue samples from patients with colorectal cancer (CRC), oxidation of C420 and C457 of plakoglobin (Pg) within tumor tissue was identified by proteomic analysis. The aim of this study was to identify the roles of Pg C420 and C457. METHODS Human CRC tissues, CRC and breast cancer cells, and normal mouse colon were prepared to validate Pg oxidation. MC38 cells were co-transfected with E-cadherin plus wild type (WT) or mutant (C420S or C457S) Pg to evaluate protein interactions and cellular localization, proliferation, and migration. RESULTS Pg was more oxidized in stage III CRC tumor tissue than in non-tumor tissue. Similar oxidation of Pg was elicited by H2O2 treatment in normal colon and cancer cells. C457S Pg exhibited diminished binding to E-cadherin and α-catenin, and reduced the assembly of E-cadherin-α-/β-catenin complexes. Correspondingly, immunofluorescent analysis of Pg cellular localization suggested impaired binding of C457S Pg to membranes. Cell migration and proliferation were also suppressed in C457S-expressing cells. DISCUSSION Pg appears to be redox-sensitive in cancer, and the C457 modification may impair cell migration and proliferation by affecting its interaction with the E-cadherin/catenin axis. Our findings suggest that redox-sensitive cysteines of Pg may be the targets for CRC therapy.
Collapse
Affiliation(s)
- Suhee Kim
- a Department of Oral Biochemistry , Dental Science Research Institute, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University , Gwangju , Republic of Korea.,b Department of Molecular Medicine (BK21plus) , Chonnam National University Graduate School , Gwangju , Republic of Korea
| | - Sun Hee Ahn
- a Department of Oral Biochemistry , Dental Science Research Institute, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University , Gwangju , Republic of Korea
| | - Hee-Young Yang
- a Department of Oral Biochemistry , Dental Science Research Institute, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University , Gwangju , Republic of Korea
| | - Jin-Sil Lee
- a Department of Oral Biochemistry , Dental Science Research Institute, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University , Gwangju , Republic of Korea
| | - Hyang-Gi Choi
- a Department of Oral Biochemistry , Dental Science Research Institute, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University , Gwangju , Republic of Korea.,b Department of Molecular Medicine (BK21plus) , Chonnam National University Graduate School , Gwangju , Republic of Korea
| | - Young-Kyu Park
- c Department of Surgery , Chonnam National University Hwasun Hospital , Hwasun , Republic of Korea
| | - Tae-Hoon Lee
- a Department of Oral Biochemistry , Dental Science Research Institute, Medical Research Center for Biomineralization Disorders, School of Dentistry, Chonnam National University , Gwangju , Republic of Korea.,b Department of Molecular Medicine (BK21plus) , Chonnam National University Graduate School , Gwangju , Republic of Korea
| |
Collapse
|