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Memarzia A, Amin F, Mokhtari-Zaer A, Arab Z, Saadat S, Heydari M, Ghasemi Z, Naghdi F, Hosseini M, Boskabady MH. Systemic and Lung Inflammation and Oxidative Stress Associated With Behavioral Changes Induced by Inhaled Paraquat Are Ameliorated by Carvacrol. PPAR Res 2024; 2024:4049448. [PMID: 39221092 PMCID: PMC11366052 DOI: 10.1155/2024/4049448] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 05/27/2024] [Accepted: 07/01/2024] [Indexed: 09/04/2024] Open
Abstract
Paraquat (PQ) is an herbicide toxin that induces injury in different organs. The anti-inflammatory and antioxidant effects of carvacrol were reported previously. The effects of carvacrol and pioglitazone (Pio) alone and their combination on inhaled PQ-induced systemic and lung oxidative stress and inflammation as well as behavioral changes were examined in rats. In this study, animals were exposed to saline (control [Ctrl]) or PQ (PQ groups) aerosols. PQ-exposed animals were treated with 0.03 mg/kg/day dexamethasone (Dexa), 20 and 80 mg/kg/day carvacrol (C-L and C-H), 5 mg/kg/day Pio, and Pio+C-L for 16 days. Inhaled PQ markedly enhanced total and differential white blood cell (WBC) counts, nitric oxide (NO), and malondialdehyde (MDA) levels but decreased catalase (CAT) and superoxide dismutase (SOD) activities and thiol levels both in the bronchoalveolar lavage fluid (BALF) and blood and increased interferon-gamma (INF-γ) and interleukin-10 (IL-10) levels in the BALF (p < 0.001 for all cases) except lymphocyte count in blood which was not significantly changed. The escape latency and traveled distance were increased in the PQ group. However, the time spent in the target quadrant in the Morris water maze (MWM) test and the duration of time latency in the dark room in the shuttle box test were reduced after receiving an electrical shock (p < 0.05-p < 0.001). Inhaled PQ-induced changes were significantly improved in carvacrol, Pio, Dexa, and especially in the combination of the Pio+C-L treated groups (p < 0.05-p < 0.001). Carvacrol and Pio improved PQ-induced changes similar to Dexa, but ameliorative effects produced by combination treatments of Pio+C-L were more prominent than Pio and C-L alone, suggesting a potentiating effect for the combination of the two agents.
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Affiliation(s)
- Arghavan Memarzia
- Applied Biomedical Research CenterMashhad University of Medical Sciences, Mashhad, Iran 9177948564
| | - Fatemeh Amin
- Physiology–Pharmacology Research CenterResearch Institute of Basic Medical SciencesRafsanjan University of Medical Sciences, Rafsanjan, Iran
- Department of Physiology and PharmacologySchool of MedicineRafsanjan University of Medical Sciences, Rafsanjan, Iran
| | - Amin Mokhtari-Zaer
- Student Research CommitteeTorbat Jam Faculty of Medical Sciences, Torbat Jam, Iran
- Department of Basic Medical SciencesMashhad University of Medical Sciences, Mashhad, Iran
| | - Zohre Arab
- Department of PhysiologyFaculty of MedicineMashhad University of Medical Sciences, Mashhad, Iran 9177948564
| | - Saeideh Saadat
- Department of PhysiologySchool of MedicineZahedan University of Medical Sciences, Zahedan, Iran 9816743175
| | - Mahrokh Heydari
- Department of PhysiologyFaculty of MedicineMashhad University of Medical Sciences, Mashhad, Iran 9177948564
| | - Zahra Ghasemi
- Cutaneous Leishmaniasis Research CenterImam Reza HospitalMashhad University of Medical Sciences, Mashhad, Iran
| | - Farzaneh Naghdi
- Department of PhysiologyFaculty of MedicineMashhad University of Medical Sciences, Mashhad, Iran 9177948564
| | - Mahmoud Hosseini
- Department of PhysiologyFaculty of MedicineMashhad University of Medical Sciences, Mashhad, Iran 9177948564
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Yang X, Xiao P, Shi X. Molecular mechanism of paraquat-induced ferroptosis leading to pulmonary fibrosis mediated by Keap1/Nrf2 signaling pathway. Mol Biol Rep 2023; 50:9249-9261. [PMID: 37812357 PMCID: PMC10635988 DOI: 10.1007/s11033-023-08756-z] [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: 08/07/2023] [Accepted: 08/16/2023] [Indexed: 10/10/2023]
Abstract
Paraquat (PQ) is a widely used and highly toxic pesticide that is often actively ingested and causes pulmonary fibrosis in patients. Ferroptosis is a regulated form of non-apoptotic cell death associated with iron-dependent lipid peroxidation. Previous studies have shown that ferroptosis is involved in the occurrence and development of acute lung injury (ALI). In this study, a model rat with inflammatory response, oxidative stress, lipid peroxidation, and pulmonary fibrosis was successfully established by PQ administration. The occurrence of ferroptosis in PQ model rats was confirmed by TUNEL staining, iron ion detection, and Ferroptosis related biomarkers detection. Western blotting (WB) and real-time PCR (RT-PCR) showed that the expression of Keap1 was significantly up-regulated and the expression of Nrf2 was significantly down-regulated in the lung tissue of PQ rats. Further transcriptomics and proteomics confirmed: (1) Enrichment of molecular processes related to iron ion binding; (2) Keap1 may promote Nrf2 ubiquitination and lead to Nrf2 degradation; (3) There is functional enrichment in ferroptosis related pathways. Our results suggest that PQ can regulate Keap1/Nrf2 signaling pathway, leading to increased lipid peroxidation and abnormal iron uptake, thereby inducing iron death and exacerbating the progression of pulmonary fibrosis. Our study provides new insights into PQ-induced pulmonary fibrosis.
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Affiliation(s)
- Xiaoxia Yang
- Department of Neurology, Tianjin First Central Hospital, Tianjin, 300192, China
| | - Ping Xiao
- Clinical Laboratory, Tianjin First Central Hospital, Tianjin, 300192, China
| | - Xiaofeng Shi
- Department of Emergency, Tianjin First Central Hospital, Tianjin, 300192, China.
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3
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Lyamzaev KG, Panteleeva AA, Simonyan RA, Avetisyan AV, Chernyak BV. The critical role of mitochondrial lipid peroxidation in ferroptosis: insights from recent studies. Biophys Rev 2023; 15:875-885. [PMID: 37974984 PMCID: PMC10643799 DOI: 10.1007/s12551-023-01126-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Accepted: 08/25/2023] [Indexed: 11/19/2023] Open
Abstract
Ferroptosis is a regulated form of necrotic cell death reliant on iron-catalyzed lipid peroxidation. Although the precise involvement of mitochondria in ferroptosis remains incompletely elucidated, recent research indicates that mitochondrial oxidative events wield a pivotal influence in this mechanism. This article centers on the most recent discoveries, spotlighting the significance of mitochondrial lipid peroxidation in the occurrence of ferroptosis. Modern investigative tools, such as mitochondria-specific dyes responsive to lipid peroxidation and antioxidants targeting mitochondria, have been employed to delve into this phenomenon. The authors' recent empirical evidence demonstrates that mitochondrial lipid peroxidation, quantified using the innovative fluorescent ratiometric probe MitoCLox, takes place prior to the onset of ferroptotic cell death. The mitochondria-targeted antioxidant SkQ1 hinders mitochondrial lipid peroxidation and thwarts ferroptosis, all while leaving unaffected the buildup of reactive oxygen species within the cytoplasm, an antecedent to mitochondrial lipid peroxidation. Similarly, the redox agent methylene blue, impeding the genesis of reactive oxygen species in complex I of the electron transport chain, also imparts a comparable protective effect. These findings collectively imply that reactive oxygen species originating from complex I might hold particular significance in fomenting mitochondrial lipid peroxidation, a pivotal trigger of ferroptosis.
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Affiliation(s)
- Konstantin G. Lyamzaev
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
- The “Russian Clinical Research Center for Gerontology” of the Ministry of Healthcare of the Russian Federation, Pirogov Russian National Research Medical University, Moscow, Russia
| | - Alisa A. Panteleeva
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Ruben A. Simonyan
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Armine V. Avetisyan
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
| | - Boris V. Chernyak
- Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, 119991 Moscow, Russia
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4
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Jiménez-Salvador I, Meade P, Iglesias E, Bayona-Bafaluy P, Ruiz-Pesini E. Developmental origins of Parkinson disease: Improving the rodent models. Ageing Res Rev 2023; 86:101880. [PMID: 36773760 DOI: 10.1016/j.arr.2023.101880] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 01/24/2023] [Accepted: 02/07/2023] [Indexed: 02/12/2023]
Abstract
Numerous pesticides are inhibitors of the oxidative phosphorylation system. Oxidative phosphorylation dysfunction adversely affects neurogenesis and often accompanies Parkinson disease. Since brain development occurs mainly in the prenatal period, early exposure to pesticides could alter the development of the nervous system and increase the risk of Parkinson disease. Different rodent models have been used to confirm this hypothesis. However, more precise considerations of the selected strain, the xenobiotic, its mode of administration, and the timing of animal analysis, are necessary to resemble the model to the human clinical condition and obtain more reliable results.
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Affiliation(s)
- Irene Jiménez-Salvador
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza, 50009- and 50013 Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, 50009 Zaragoza, Spain.
| | - Patricia Meade
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza, 50009- and 50013 Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, 50009 Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), 28029 Madrid, Spain; Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Universidad de Zaragoza, 50018 Zaragoza, Spain.
| | - Eldris Iglesias
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza, 50009- and 50013 Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, 50009 Zaragoza, Spain; Facultad de Ciencias de la Salud, Universidad San Jorge, 50830 Villanueva de Gállego, Zaragoza, Spain.
| | - Pilar Bayona-Bafaluy
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza, 50009- and 50013 Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, 50009 Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), 28029 Madrid, Spain; Instituto de Biocomputación y Física de Sistemas Complejos (BIFI), Universidad de Zaragoza, 50018 Zaragoza, Spain.
| | - Eduardo Ruiz-Pesini
- Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza, 50009- and 50013 Zaragoza, Spain; Instituto de Investigación Sanitaria (IIS) de Aragón, 50009 Zaragoza, Spain; Centro de Investigaciones Biomédicas en Red de Enfermedades Raras (CIBERER), 28029 Madrid, Spain.
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Liu C, Sun Z, Wang M, Yang Z, Zhang W, Ren Y, Han X, Zhang B, Yao M, Nie S. Mitoquinone mitigates paraquat-induced A549 lung epithelial cell injury by promoting MFN1/MFN2-mediated mitochondrial fusion. J Biochem Mol Toxicol 2022; 36:e23127. [PMID: 35686354 DOI: 10.1002/jbt.23127] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 04/16/2022] [Accepted: 05/29/2022] [Indexed: 12/21/2022]
Abstract
Paraquat (PQ) poisoning often leads to severe lung injuries, in which the mitochondria damage plays a critical role. Mitoquinone (MitoQ), a newly designed mitochondria-targeted antioxidant, has been proved for its benefit in mitochondria protection. However, the role of MitoQ in PQ-induced lung injury remains unclear. Thus, this study was performed to investigate the effect of MitoQ on PQ-induced lung injury and its underlying mechanisms. Our work showed that PQ caused the inhibition of A549 lung epithelial cell viability in a dose-dependent manner, while MitoQ remarkably mitigated the PQ-induced cell viability suppression. Besides this, PQ-mediated apoptosis of A549 cells was significantly attenuated by MitoQ, as indicated by the TUNEL assay and mitochondria membrane potential assay. Moreover, the intracellular reactive oxygen species (ROS) production was also dramatically suppressed when cotreated MitoQ with PQ. This could be ascribed to enhanced mitochondrial fusion mediated by Mitofusin 1 (MFN1)/Mitofusin 2 (MFN2), because MitoQ preserved mitochondrial network integrity, as reflected by MitoTracker staining, and MitoQ also increased the expression of MFN1/MFN2 in A549 cells after PQ treatment. Our data suggested MitoQ mitigated PQ-induced lung epithelial cell injury by promoting MFN1/MFN2-mediated mitochondrial fusion, and MitoQ might be a potential candidate drug for the treatment of PQ-induced lung injury.
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Affiliation(s)
- Chao Liu
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Zhaorui Sun
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Mengmeng Wang
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Zhizhou Yang
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Wei Zhang
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Yi Ren
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Xiaoqin Han
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Bo Zhang
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Mengya Yao
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
| | - Shinan Nie
- Department of Emergency Medicine, Jinling Hospital, Medical School of Nanjing University, Nanjing, PR China
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6
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Tatjana V, Domitille S, Jean-Charles S. Paraquat-induced cholesterol biosynthesis proteins dysregulation in human brain microvascular endothelial cells. Sci Rep 2021; 11:18137. [PMID: 34518572 PMCID: PMC8438088 DOI: 10.1038/s41598-021-97175-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Accepted: 08/23/2021] [Indexed: 12/25/2022] Open
Abstract
Despite Paraquat (PQ) being banned in several countries, it is still one of the most commonly used herbicides in agriculture. This compound is known to induce damaging effects on human and animal brain cells by generating Reactive Oxygen Species (ROS). However, there is few evidence of PQ effect on Human Brain Microvascular Endothelial Cells (HBMECs), one of the major component of the Blood–Brain Barrier (BBB). The present study aimed at unraveling biological mechanisms associated to the exposure of 1, 10 and 100 µM of PQ for 24 h on HBMECs. High-throughput mass spectrometry-based proteomics using data-independent acquisition (DIA) was applied. Biological pathway enrichment and cellular assays such as mitochondrial respiration and cholesterol level were performed to verify proteomics results. A total of 3753 proteins were quantified out of which 419 were significantly modulated by paraquat exposure. Biological pathway enrichment revealed the ubiquinone metabolism, a pathway directly linked to mitochondrial complex I proteins, confirming the well-known mechanism of PQ inducing oxidative stress. Additionally, this study also described the cholesterol biosynthesis modulation on HBMECs not yet described. In conclusion, our data indicate the toxic effect of PQ on HBMECs by downregulating proteins involved in mitochondrial complex I and cholesterol pathways.
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Affiliation(s)
- Vujić Tatjana
- Department of Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Swiss Center for Applied Human Toxicology, Geneva, Switzerland
| | - Schvartz Domitille
- Department of Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland.,Swiss Center for Applied Human Toxicology, Geneva, Switzerland
| | - Sanchez Jean-Charles
- Department of Medicine, Faculty of Medicine, University of Geneva, Geneva, Switzerland. .,Swiss Center for Applied Human Toxicology, Geneva, Switzerland.
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7
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Ubiquinone Metabolism and Transcription HIF-1 Targets Pathway Are Toxicity Signature Pathways Present in Extracellular Vesicles of Paraquat-Exposed Human Brain Microvascular Endothelial Cells. Int J Mol Sci 2021; 22:ijms22105065. [PMID: 34064677 PMCID: PMC8150401 DOI: 10.3390/ijms22105065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2021] [Revised: 05/03/2021] [Accepted: 05/08/2021] [Indexed: 11/24/2022] Open
Abstract
Over the last decade, the knowledge in extracellular vesicles (EVs) biogenesis and modulation has increasingly grown. As their content reflects the physiological state of their donor cells, these “intercellular messengers” progressively became a potential source of biomarker reflecting the host cell state. However, little is known about EVs released from the human brain microvascular endothelial cells (HBMECs). The current study aimed to isolate and characterize EVs from HBMECs and to analyze their EVs proteome modulation after paraquat (PQ) stimulation, a widely used herbicide known for its neurotoxic effect. Size distribution, concentration and presence of well-known EV markers were assessed. Identification and quantification of PQ-exposed EV proteins was conducted by data-independent acquisition mass spectrometry (DIA-MS). Signature pathways of PQ-treated EVs were analyzed by gene ontology terms and pathway enrichment. Results highlighted that EVs exposed to PQ have modulated pathways, namely the ubiquinone metabolism and the transcription HIF-1 targets. These pathways may be potential molecular signatures of the PQ-induced toxicity carried by EVs that are reflecting their cell of origin by transporting with them irreversible functional changes.
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8
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Dostal V, Wood SD, Thomas CT, Han Y, Lau E, Lam MPY. Proteomic signatures of acute oxidative stress response to paraquat in the mouse heart. Sci Rep 2020; 10:18440. [PMID: 33116222 PMCID: PMC7595225 DOI: 10.1038/s41598-020-75505-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Accepted: 10/15/2020] [Indexed: 01/11/2023] Open
Abstract
The heart is sensitive to oxidative damage but a global view on how the cardiac proteome responds to oxidative stressors has yet to fully emerge. Using quantitative tandem mass spectrometry, we assessed the effects of acute exposure of the oxidative stress inducer paraquat on protein expression in mouse hearts. We observed widespread protein expression changes in the paraquat-exposed heart especially in organelle-containing subcellular fractions. During cardiac response to acute oxidative stress, proteome changes are consistent with a rapid reduction of mitochondrial metabolism, coupled with activation of multiple antioxidant proteins, reduction of protein synthesis and remediation of proteostasis. In addition to differential expression, we saw evidence of spatial reorganizations of the cardiac proteome including the translocation of hexokinase 2 to more soluble fractions. Treatment with the antioxidants Tempol and MitoTEMPO reversed many proteomic signatures of paraquat but this reversal was incomplete. We also identified a number of proteins with unknown function in the heart to be triggered by paraquat, suggesting they may have functions in oxidative stress response. Surprisingly, protein expression changes in the heart correlate poorly with those in the lung, consistent with differential sensitivity or stress response in these two organs. The results and data set here could provide insights into oxidative stress responses in the heart and avail the search for new therapeutic targets.
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Affiliation(s)
- Vishantie Dostal
- Department of Medicine, Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Department of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Department of Biochemistry and Molecular Genetics, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Consortium for Fibrosis Research & Translation, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Silas D Wood
- Department of Medicine, Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Department of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Department of Biochemistry and Molecular Genetics, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Consortium for Fibrosis Research & Translation, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Cody T Thomas
- Department of Medicine, Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Department of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Yu Han
- Department of Medicine, Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Department of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Department of Biochemistry and Molecular Genetics, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Consortium for Fibrosis Research & Translation, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Edward Lau
- Department of Medicine, Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Department of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.,Consortium for Fibrosis Research & Translation, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA
| | - Maggie P Y Lam
- Department of Medicine, Division of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA. .,Department of Cardiology, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA. .,Department of Biochemistry and Molecular Genetics, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA. .,Consortium for Fibrosis Research & Translation, University of Colorado Anschutz Medical Campus, Aurora, CO, 80045, USA.
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9
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Kim CS, Li JH, Barco B, Park HB, Gatsios A, Damania A, Wang R, Wyche TP, Piizzi G, Clay NK, Crawford JM. Cellular Stress Upregulates Indole Signaling Metabolites in Escherichia coli. Cell Chem Biol 2020; 27:698-707.e7. [PMID: 32243812 PMCID: PMC7306003 DOI: 10.1016/j.chembiol.2020.03.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 02/04/2020] [Accepted: 03/02/2020] [Indexed: 12/13/2022]
Abstract
Escherichia coli broadly colonize the intestinal tract of humans and produce a variety of small molecule signals. However, many of these small molecules remain unknown. Here, we describe a family of widely distributed bacterial metabolites termed the "indolokines." In E. coli, the indolokines are upregulated in response to a redox stressor via aspC and tyrB transaminases. Although indolokine 1 represents a previously unreported metabolite, four of the indolokines (2-5) were previously shown to be derived from indole-3-carbonyl nitrile (ICN) in the plant pathogen defense response. We show that the indolokines are produced in a convergent evolutionary manner relative to plants, enhance E. coli persister cell formation, outperform ICN protection in an Arabidopsis thaliana-Pseudomonas syringae infection model, trigger a hallmark plant innate immune response, and activate distinct immunological responses in primary human tissues. Our molecular studies link a family of cellular stress-induced metabolites to defensive responses across bacteria, plants, and humans.
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Affiliation(s)
- Chung Sub Kim
- Department of Chemistry, Yale University, New Haven, CT 06520, USA; Chemical Biology Institute, Yale University, West Haven, CT 06516, USA
| | - Jhe-Hao Li
- Department of Chemistry, Yale University, New Haven, CT 06520, USA; Chemical Biology Institute, Yale University, West Haven, CT 06516, USA
| | - Brenden Barco
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06511, USA
| | - Hyun Bong Park
- Department of Chemistry, Yale University, New Haven, CT 06520, USA; Chemical Biology Institute, Yale University, West Haven, CT 06516, USA
| | - Alexandra Gatsios
- Department of Chemistry, Yale University, New Haven, CT 06520, USA; Chemical Biology Institute, Yale University, West Haven, CT 06516, USA
| | - Ashiti Damania
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06511, USA
| | - Rurun Wang
- Exploratory Science Center, Merck & Co., Inc., Cambridge, MA 02141, USA
| | - Thomas P Wyche
- Exploratory Science Center, Merck & Co., Inc., Cambridge, MA 02141, USA
| | - Grazia Piizzi
- Exploratory Science Center, Merck & Co., Inc., Cambridge, MA 02141, USA
| | - Nicole K Clay
- Department of Molecular, Cellular and Developmental Biology, Yale University, New Haven, CT 06511, USA
| | - Jason M Crawford
- Department of Chemistry, Yale University, New Haven, CT 06520, USA; Chemical Biology Institute, Yale University, West Haven, CT 06516, USA; Department of Microbial Pathogenesis, Yale School of Medicine, New Haven, CT 06536, USA.
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10
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Neuroprotective action of Eicosapentaenoic (EPA) and Docosahexaenoic (DHA) acids on Paraquat intoxication in Drosophila melanogaster. Neurotoxicology 2019; 70:154-160. [DOI: 10.1016/j.neuro.2018.11.013] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2018] [Revised: 11/23/2018] [Accepted: 11/26/2018] [Indexed: 11/19/2022]
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11
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Aw WC, Towarnicki SG, Melvin RG, Youngson NA, Garvin MR, Hu Y, Nielsen S, Thomas T, Pickford R, Bustamante S, Vila-Sanjurjo A, Smyth GK, Ballard JWO. Genotype to phenotype: Diet-by-mitochondrial DNA haplotype interactions drive metabolic flexibility and organismal fitness. PLoS Genet 2018; 14:e1007735. [PMID: 30399141 PMCID: PMC6219761 DOI: 10.1371/journal.pgen.1007735] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2018] [Accepted: 10/02/2018] [Indexed: 02/07/2023] Open
Abstract
Diet may be modified seasonally or by biogeographic, demographic or cultural shifts. It can differentially influence mitochondrial bioenergetics, retrograde signalling to the nuclear genome, and anterograde signalling to mitochondria. All these interactions have the potential to alter the frequencies of mtDNA haplotypes (mitotypes) in nature and may impact human health. In a model laboratory system, we fed four diets varying in Protein: Carbohydrate (P:C) ratio (1:2, 1:4, 1:8 and 1:16 P:C) to four homoplasmic Drosophila melanogaster mitotypes (nuclear genome standardised) and assayed their frequency in population cages. When fed a high protein 1:2 P:C diet, the frequency of flies harbouring Alstonville mtDNA increased. In contrast, when fed the high carbohydrate 1:16 P:C food the incidence of flies harbouring Dahomey mtDNA increased. This result, driven by differences in larval development, was generalisable to the replacement of the laboratory diet with fruits having high and low P:C ratios, perturbation of the nuclear genome and changes to the microbiome. Structural modelling and cellular assays suggested a V161L mutation in the ND4 subunit of complex I of Dahomey mtDNA was mildly deleterious, reduced mitochondrial functions, increased oxidative stress and resulted in an increase in larval development time on the 1:2 P:C diet. The 1:16 P:C diet triggered a cascade of changes in both mitotypes. In Dahomey larvae, increased feeding fuelled increased β-oxidation and the partial bypass of the complex I mutation. Conversely, Alstonville larvae upregulated genes involved with oxidative phosphorylation, increased glycogen metabolism and they were more physically active. We hypothesise that the increased physical activity diverted energy from growth and cell division and thereby slowed development. These data further question the use of mtDNA as an assumed neutral marker in evolutionary and population genetic studies. Moreover, if humans respond similarly, we posit that individuals with specific mtDNA variations may differentially metabolise carbohydrates, which has implications for a variety of diseases including cardiovascular disease, obesity, and perhaps Parkinson's Disease.
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Affiliation(s)
- Wen C. Aw
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Samuel G. Towarnicki
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Richard G. Melvin
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Neil A. Youngson
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Michael R. Garvin
- School of Biological Sciences, Washington State University, Pullman, Washington, United States of America
| | - Yifang Hu
- The Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria, Australia
| | - Shaun Nielsen
- Centre for Marine Bio-Innovation and School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Torsten Thomas
- Centre for Marine Bio-Innovation and School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, NSW, Australia
| | - Russell Pickford
- Bioanalytical Mass Spectrometry Facility, Mark Wainwright Analytical Center, The University of New South Wales, Sydney, NSW, Australia
| | - Sonia Bustamante
- Bioanalytical Mass Spectrometry Facility, Mark Wainwright Analytical Center, The University of New South Wales, Sydney, NSW, Australia
| | - Antón Vila-Sanjurjo
- Grupo GIBE, Bioloxía Celular e Molecular, Facultade de Ciencias, Universidade da Coruña (UDC), Campus Zapateira s/n, A Coruña, Spain
| | - Gordon K. Smyth
- The Walter and Eliza Hall Institute of Medical Research, Melbourne, Victoria, Australia
- School of Mathematics and Statistics, The University of Melbourne, Melbourne, Victoria, Australia
| | - J. William O. Ballard
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
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12
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Chen T, Tan J, Wan Z, Zou Y, Afewerky HK, Zhang Z, Zhang T. Effects of Commonly Used Pesticides in China on the Mitochondria and Ubiquitin-Proteasome System in Parkinson's Disease. Int J Mol Sci 2017; 18:ijms18122507. [PMID: 29168786 PMCID: PMC5751110 DOI: 10.3390/ijms18122507] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2017] [Revised: 11/12/2017] [Accepted: 11/20/2017] [Indexed: 02/08/2023] Open
Abstract
Evidence continues to accumulate that pesticides are the leading candidates of environmental toxins that may contribute to the pathogenesis of Parkinson’s disease. The mechanisms, however, remain largely unclear. According to epidemiological studies, we selected nine representative pesticides (paraquat, rotenone, chlorpyrifos, pendimethalin, endosulfan, fenpyroximate, tebufenpyrad, trichlorphon and carbaryl) which are commonly used in China and detected the effects of the pesticides on mitochondria and ubiquitin-proteasome system (UPS) function. Our results reveal that all the nine studied pesticides induce morphological changes of mitochondria at low concentrations. Paraquat, rotenone, chlorpyrifos, pendimethalin, endosulfan, fenpyroximate and tebufenpyrad induced mitochondria fragmentation. Furthermore, some of them (paraquat, rotenone, chlorpyrifos, fenpyroximate and tebufenpyrad) caused a significant dose-dependent decrease of intracellular ATP. Interestingly, these pesticides which induce mitochondria dysfunction also inhibit 26S and 20S proteasome activity. However, two out of the nine pesticides, namely trichlorphon and carbaryl, were found not to cause mitochondrial fragmentation or functional damage, nor inhibit the activity of the proteasome, which provides significant guidance for selection of pesticides in China. Moreover, our results demonstrate a potential link between inhibition of mitochondria and the UPS, and pesticide-induced Parkinsonism.
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Affiliation(s)
- Tingting Chen
- State Key Laboratory of Medical Genetics, Xiangya Medical School, Central South University, Changsha 410078, China.
| | - Jieqiong Tan
- State Key Laboratory of Medical Genetics, Xiangya Medical School, Central South University, Changsha 410078, China.
| | - Zhengqing Wan
- State Key Laboratory of Medical Genetics, Xiangya Medical School, Central South University, Changsha 410078, China.
| | - Yongyi Zou
- State Key Laboratory of Medical Genetics, Xiangya Medical School, Central South University, Changsha 410078, China.
| | - Henok Kessete Afewerky
- State Key Laboratory of Medical Genetics, Xiangya Medical School, Central South University, Changsha 410078, China.
- Department of Physiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
- The Institute of Brain Research, Huazhong University of Science and Technology, Wuhan 430030, China.
| | - Zhuohua Zhang
- State Key Laboratory of Medical Genetics, Xiangya Medical School, Central South University, Changsha 410078, China.
| | - Tongmei Zhang
- State Key Laboratory of Medical Genetics, Xiangya Medical School, Central South University, Changsha 410078, China.
- Department of Physiology, School of Basic Medicine, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China.
- The Institute of Brain Research, Huazhong University of Science and Technology, Wuhan 430030, China.
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13
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Smeyne RJ, Breckenridge CB, Beck M, Jiao Y, Butt MT, Wolf JC, Zadory D, Minnema DJ, Sturgess NC, Travis KZ, Cook AR, Smith LL, Botham PA. Assessment of the Effects of MPTP and Paraquat on Dopaminergic Neurons and Microglia in the Substantia Nigra Pars Compacta of C57BL/6 Mice. PLoS One 2016; 11:e0164094. [PMID: 27788145 PMCID: PMC5082881 DOI: 10.1371/journal.pone.0164094] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 09/20/2016] [Indexed: 12/21/2022] Open
Abstract
The neurotoxicity of paraquat dichloride (PQ) was assessed in two inbred strains of 9- or 16-week old male C57BL/6 mice housed in two different laboratories and compared to the effects of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). PQ was administered by intraperitoneal injections; either once (20 mg/kg) or twice (10 mg/kg) weekly for 3 weeks, while MPTP-HCl was injected 4 times on a single day (20 mg/kg/dose). Brains were collected 8, 16, 24, 48, 96 or 168 hours after the last PQ treatment, and 48 or 168 hours after MPTP treatment. Dopamine neurons in the substantia nigra pars compacta (SNpc) were identified by antibodies to tyrosine hydroxylase (TH+) and microglia were identified using Iba-1 immunoreactivity. The total number of TH+ neurons and the number of resting and activated microglia in the SNpc at 168 hours after the last dose were estimated using model- or design-based stereology, with investigators blinded to treatment. In a further analysis, a pathologist, also blinded to treatment, evaluated the SNpc and/or striatum for loss of TH+ neurons (SNpc) or terminals (striatum), cell death (as indicated by amino cupric silver uptake, TUNEL and/or caspase 3 staining) and neuroinflammation (as indicated by Iba-1 and/or GFAP staining). PQ, administered either once or twice weekly to 9- or 16-week old mice from two suppliers, had no effect on the number of TH+ neurons or microglia in the SNpc, as assessed by two groups, each blinded to treatment, using different stereological methods. PQ did not induce neuronal cell loss or degeneration in the SNpc or striatum. Additionally, there was no evidence of apoptosis, microgliosis or astrogliosis. In MPTP-treated mice, the number of TH+ neurons in the SNpc was significantly decreased and the number of activated microglia increased. Histopathological assessment found degenerating neurons/terminals in the SNpc and striatum but no evidence of apoptotic cell death. MPTP activated microglia in the SNpc and increased the number of astrocytes in the SNpc and striatum.
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Affiliation(s)
- Richard Jay Smeyne
- St. Jude Children’s Research Hospital, Dept. of Developmental Neurobiology, 262 Danny Thomas Place, Memphis, TN 38105, United States of America
- * E-mail:
| | - Charles B. Breckenridge
- Syngenta Crop Protection, LLC, P.O. Box 18300, Greensboro, NC 27419–8300, United States of America
| | - Melissa Beck
- WIL Research Laboratories, LLC., Ashland, OH 44805, United States of America
| | - Yun Jiao
- St. Jude Children’s Research Hospital, Dept. of Developmental Neurobiology, 262 Danny Thomas Place, Memphis, TN 38105, United States of America
| | - Mark T. Butt
- Tox Path Specialists, LLC, 8747 Chestnut Grove Road, Frederick, MD 21701–2607, United States of America
| | - Jeffrey C. Wolf
- Experimental Pathology Laboratories, Inc., 45600 Terminal Drive, Sterling, VA 20166, United States of America
| | - Dan Zadory
- Experimental Pathology Laboratories, Inc., 45600 Terminal Drive, Sterling, VA 20166, United States of America
| | - Daniel J. Minnema
- Syngenta Crop Protection, LLC, P.O. Box 18300, Greensboro, NC 27419–8300, United States of America
| | - Nicholas C. Sturgess
- Syngenta Limited, Jealott's Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, United Kingdom
| | - Kim Z. Travis
- Syngenta Limited, Jealott's Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, United Kingdom
| | - Andrew R. Cook
- Syngenta Limited, Jealott's Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, United Kingdom
| | - Lewis L. Smith
- University of Leicester, University Road, Leicester LE1 7RH, United Kingdom
| | - Philip A. Botham
- Syngenta Limited, Jealott's Hill International Research Centre, Bracknell, Berkshire, RG42 6EY, United Kingdom
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14
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Li-Byarlay H, Huang MH, Simone-Finstrom M, Strand MK, Tarpy DR, Rueppell O. Honey bee (Apis mellifera) drones survive oxidative stress due to increased tolerance instead of avoidance or repair of oxidative damage. Exp Gerontol 2016; 83:15-21. [PMID: 27422326 DOI: 10.1016/j.exger.2016.07.003] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2015] [Revised: 06/10/2016] [Accepted: 07/11/2016] [Indexed: 11/25/2022]
Abstract
Oxidative stress can lead to premature aging symptoms and cause acute mortality at higher doses in a range of organisms. Oxidative stress resistance and longevity are mechanistically and phenotypically linked; considerable variation in oxidative stress resistance exists among and within species and typically covaries with life expectancy. However, it is unclear whether stress-resistant, long-lived individuals avoid, repair, or tolerate molecular damage to survive longer than others. The honey bee (Apis mellifera L.) is an emerging model system that is well-suited to address this question. Furthermore, this species is the most economically important pollinator, whose health may be compromised by pesticide exposure, including oxidative stressors. Here, we develop a protocol for inducing oxidative stress in honey bee males (drones) via Paraquat injection. After injection, individuals from different colony sources were kept in common social conditions to monitor their survival compared to saline-injected controls. Oxidative stress was measured in susceptible and resistant individuals. Paraquat drastically reduced survival but individuals varied in their resistance to treatment within and among colony sources. Longer-lived individuals exhibited higher levels of lipid peroxidation than individuals dying early. In contrast, the level of protein carbonylation was not significantly different between the two groups. This first study of oxidative stress in male honey bees suggests that survival of an acute oxidative stressor is due to tolerance, not prevention or repair, of oxidative damage to lipids. It also demonstrates colony differences in oxidative stress resistance that might be useful for breeding stress-resistant honey bees.
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Affiliation(s)
- Hongmei Li-Byarlay
- Department of Entomology, North Carolina State University, Raleigh, NC, USA; W.M. Keck Center for Behavioral Biology, North Carolina State University, Raleigh, NC, USA; Department of Biology, University of North Carolina at Greensboro, Greensboro, NC, USA.
| | | | | | - Micheline K Strand
- Life Sciences Division, U.S. Army Research Office, Research Triangle Park, NC, USA
| | - David R Tarpy
- Department of Entomology, North Carolina State University, Raleigh, NC, USA; W.M. Keck Center for Behavioral Biology, North Carolina State University, Raleigh, NC, USA
| | - Olav Rueppell
- Department of Biology, University of North Carolina at Greensboro, Greensboro, NC, USA.
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15
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Jiao Y, Dou Y, Lockwood G, Pani A, Jay Smeyne R. Acute Effects of 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) or Paraquat on Core Temperature in C57BL/6J Mice. JOURNAL OF PARKINSONS DISEASE 2016; 5:389-401. [PMID: 25633843 PMCID: PMC4923733 DOI: 10.3233/jpd-140424] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Background: MPTP and paraquat are two compounds that have been used to model Parkinson’s disease in mice. Previous studies in two non-traditional strains of mice have shown that a single dose of MPTP can induce changes in body temperature, while the effects of paraquat have not been examined. Examination of body temperature is important since small fluctuations in an animal’s core temperature can significantly affect drug metabolism, and if significant enough can even culminate in an animal’s death. Objective: To determine how external heating can alter the survival of C57BL/6J mice following MPTP administration. Methods: In this study, we examine the effects of MPTP (4×20 mg/kg, 2 hours apart) and paraquat (2×10 mg/kg/week for 3 weeks) on core temperature of C57BL/6J mice. Correlations of purine and catecholamine levels were also done in mice treated with MPTP. Results: We find that MPTP induces a significant hypothermia in C57BL/6J mice that reduces their core temperature below the limit of fatal hypothermia. Unlike MPTP, paraquat did not induce a significant hypothermia. Placement of animals on heating pads significantly abrogates the loss of core temperature. In both heated and non-heated conditions, mice treated with MPTP showed a significant depletion of ATP within 2 hours of administration in both striatum and SN that started to recover 2 hours after MPTP administration was complete. Striatal DA and DOPAC are significantly reduced starting 4–6 hours after MPTP. Conclusions: The fatal hypothermic effects of MPTP can be abrogated through use of external heating.
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Affiliation(s)
- Yun Jiao
- Department of Developmental Neurobiology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Yuchen Dou
- Department of Developmental Neurobiology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Georgina Lockwood
- Department of Developmental Neurobiology, St. Jude Children's Research Hospital, Memphis, TN, USA.,Department of Biochemistry, University of Bath, Bath, UK
| | - Amar Pani
- Department of Developmental Neurobiology, St. Jude Children's Research Hospital, Memphis, TN, USA
| | - Richard Jay Smeyne
- Department of Developmental Neurobiology, St. Jude Children's Research Hospital, Memphis, TN, USA
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16
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Novaes RD, Gonçalves RV, Cupertino MC, Santos EC, Bigonha SM, Fernandes GJM, Maldonado IRSC, Natali AJ. Acute paraquat exposure determines dose-dependent oxidative injury of multiple organs and metabolic dysfunction in rats: impact on exercise tolerance. Int J Exp Pathol 2016; 97:114-24. [PMID: 27277193 DOI: 10.1111/iep.12183] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2015] [Accepted: 03/10/2016] [Indexed: 01/08/2023] Open
Abstract
This study investigated the pathological morphofunctional adaptations related to the imbalance of exercise tolerance triggered by paraquat (PQ) exposure in rats. The rats were randomized into four groups with eight animals each: (a) SAL (control): 0.5 ml of 0.9% NaCl solution; (b) PQ10: PQ 10 mg/kg; (c) PQ20: PQ 20 mg/kg; and (d) PQ30: PQ 30 mg/kg. Each group received a single injection of PQ. After 72 hours, the animals were subjected to an incremental aerobic running test until fatigue in order to determine exercise tolerance, blood glucose and lactate levels. After the next 24 h, lung, liver and skeletal muscle were collected for biometric, biochemical and morphological analyses. The animals exposed to PQ exhibited a significant anticipation of anaerobic metabolism during the incremental aerobic running test, a reduction in exercise tolerance and blood glucose levels as well as increased blood lactate levels during exercise compared to control animals. PQ exposure increased serum transaminase levels and reduced the glycogen contents in liver tissue and skeletal muscles. In the lung, the liver and the skeletal muscle, PQ exposure also increased the contents of malondialdehyde, protein carbonyl, 8-hydroxy-2'-deoxyguanosine, superoxide dismutase and catalase, as well as a structural remodelling compared to the control group. All these changes were dose-dependent. Reduced exercise tolerance after PQ exposure was potentially influenced by pathological remodelling of multiple organs, in which glycogen depletion in the liver and skeletal muscle and the imbalance of glucose metabolism coexist with the induction of lipid, protein and DNA oxidation, a destructive process not counteracted by the upregulation of endogenous antioxidant enzymes.
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Affiliation(s)
- Rômulo D Novaes
- Department of Structural Biology, Federal University of Alfenas, Alfenas, MG, Brazil
| | | | - Marli C Cupertino
- Department of General Biology, Federal University of Viçosa, Viçosa, MG, Brazil
| | - Eliziária C Santos
- Department of General Biology, Federal University of Viçosa, Viçosa, MG, Brazil
| | - Solange M Bigonha
- Department of Nutrition and Health, Federal University of Viçosa, Viçosa, MG, Brazil
| | | | | | - Antônio J Natali
- Department of Physical Education, Federal University of Viçosa, Viçosa, MG, Brazil
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17
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Multifactorial theory applied to the neurotoxicity of paraquat and paraquat-induced mechanisms of developing Parkinson's disease. J Transl Med 2016; 96:496-507. [PMID: 26829122 DOI: 10.1038/labinvest.2015.161] [Citation(s) in RCA: 57] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 10/07/2015] [Accepted: 10/12/2015] [Indexed: 11/08/2022] Open
Abstract
Laboratory studies involving repeated exposure to paraquat (PQ) in different animal models can induce many of the pathological features of Parkinson's disease (PD), such as the loss of dopaminergic neurons in the nigrostriatal dopamine system. Epidemiological studies identify an increased risk of developing PD in human populations living in areas where PQ exposure is likely to occur and among workers lacking appropriate protective equipment. The mechanisms involved in developing PD may not be due to any single cause, but rather a multifactorial situation may exist where PQ exposure may cause PD in some circumstances. Multifactorial theory is adopted into this review that includes a number of sub-cellular mechanisms to explain the pathogenesis of PD. The theory is placed into an environmental context of chronic low-dose exposure to PQ that consequently acts as an oxidative stress inducer. Oxidative stress and the metabolic processes of PQ-inducing excitotoxicity, α-synuclein aggregate formation, autophagy, alteration of dopamine catabolism, and inactivation of tyrosine hydroxylase are positioned as causes for the loss of dopaminergic cells. The environmental context and biochemistry of PQ in soils, water, and organisms is also reviewed to identify potential routes that can lead to chronic rates of low-dose exposure that would replicate the type of response that is observed in animal models, epidemiological studies, and other types of laboratory investigations involving PQ exposure. The purpose of this review is to synthesize key relations and summarize hypotheses linking PD to PQ exposure by using the multifactorial approach. Recommendations are given to integrate laboratory methods to the environmental context as a means to improve on experimental design. The multifactorial approach is necessary for conducting valid tests of causal relations, for understanding of potential relations between PD and PQ exposure, and may prevent further delay in solving what has proven to be an evasive etiological problem.
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18
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Affiliation(s)
- Rebecca E. Koch
- Department of Biological Sciences Auburn University 101 Life Sciences Hall Auburn AL 36830 USA
| | - Geoffrey E. Hill
- Department of Biological Sciences Auburn University 101 Life Sciences Hall Auburn AL 36830 USA
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19
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de Oliveira MR, Ferreira GC, Schuck PF. Protective effect of carnosic acid against paraquat-induced redox impairment and mitochondrial dysfunction in SH-SY5Y cells: Role for PI3K/Akt/Nrf2 pathway. Toxicol In Vitro 2015; 32:41-54. [PMID: 26686574 DOI: 10.1016/j.tiv.2015.12.005] [Citation(s) in RCA: 69] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2015] [Revised: 09/29/2015] [Accepted: 12/09/2015] [Indexed: 12/31/2022]
Abstract
Carnosic acid (CA) is a phenolic diterpene isolated from Rosmarinus officinalis and exerts anti-inflammatory, antioxidant, and anticarcinogenic activities in different cell types. It has been reported that CA is able to cause protective effects on experimental models of neurodegeneration. However, the exact mechanism by which CA prevents neuronal degeneration remains to be better studied. We investigated here whether there is a role for CA as a neuroprotective agent in a paraquat (PQ) model of Parkinson's disease (PD) regarding cellular and mitochondrial-related redox parameters. SH-SY5Y cells were treated with CA for 12h and were exposed to 100 μM PQ for 24h. It was found that CA at different concentrations prevented the effects of PQ on cell viability and redox parameters. CA alleviated reactive oxygen and nitrogen species production elicited by PQ, as well as decreased the toxic effect on mitochondrial function. Inhibition of Pi3K/Akt pathway with LY294002 or silencing of Nrf2 expression partially blocked the reversal of redox impairment induced by CA. Therefore, CA activated Nrf2 through modulation of PI3K/Akt pathway resulting in increased levels of antioxidant enzymes and consequent neuroprotection. Thus, CA may be viewed as a potential neuroprotective agent to be used in cases of Parkinson's disease (PD).
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Affiliation(s)
- Marcos Roberto de Oliveira
- Programa de Pós-Graduação em Química, Departamento de Química (DQ), Instituto de Ciências Exatas e da Terra (ICET), Universidade Federal de Mato Grosso (UFMT), Av. Fernando Corrêa da Costa, 2367, CEP 78060-900 Cuiabá, MT, Brazil.
| | - Gustavo Costa Ferreira
- Laboratório de Erros Inatos do Metabolismo, Unidade Acadêmica de Ciências da Saúde, Universidade do Extremo Sul Catarinense (UNESC), Programa de Pós-Graduação em Ciências da Saúde, Criciúma, SC, Brazil
| | - Patrícia Fernanda Schuck
- Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, RJ, Brazil
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20
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Contribution of dopamine to mitochondrial complex I inhibition and dopaminergic deficits caused by methylenedioxymethamphetamine in mice. Neuropharmacology 2015; 93:124-33. [DOI: 10.1016/j.neuropharm.2015.01.025] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 12/19/2014] [Accepted: 01/27/2015] [Indexed: 11/13/2022]
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21
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Nisar R, Hanson PS, He L, Taylor RW, Blain PG, Morris CM. Diquat causes caspase-independent cell death in SH-SY5Y cells by production of ROS independently of mitochondria. Arch Toxicol 2015; 89:1811-25. [PMID: 25693864 PMCID: PMC4572080 DOI: 10.1007/s00204-015-1453-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Accepted: 01/06/2015] [Indexed: 01/23/2023]
Abstract
Evidence indicates that Parkinson's disease (PD), in addition to having a genetic aetiology, has an environmental component that contributes to disease onset and progression. The exact nature of any environmental agent contributing to PD is unknown in most cases. Given its similarity to paraquat, an agrochemical removed from registration in the EU for its suspected potential to cause PD, we have investigated the in vitro capacity of the related herbicide Diquat to cause PD-like cell death. Diquat showed greater toxicity towards SH-SY5Y neuroblastoma cells and human midbrain neural cells than paraquat and also MPTP, which was independent of dopamine transporter-mediated uptake. Diquat caused cell death independently of caspase activation, potentially via RIP1 kinase, with only a minor contribution from apoptosis, which was accompanied by enhanced reactive oxygen species production in the absence of major inhibition of complex I of the mitochondrial respiratory chain. No changes in α-synuclein expression were observed following 24-h or 4-week exposure. Diquat may, therefore, kill neural tissue by programmed necrosis rather than apoptosis, reflecting the pathological changes seen following high-level exposure, although its ability to promote PD is unclear.
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Affiliation(s)
- R Nisar
- The Medical Toxicology Centre, and NIHR HPRU in Chemical and Radiation Threats and Hazards, Wolfson Building, Newcastle University, Claremont Place, Newcastle upon Tyne, Tyne and Wear, NE2 4AA, UK
| | - P S Hanson
- The Medical Toxicology Centre, and NIHR HPRU in Chemical and Radiation Threats and Hazards, Wolfson Building, Newcastle University, Claremont Place, Newcastle upon Tyne, Tyne and Wear, NE2 4AA, UK
| | - L He
- Mitochondrial Research Group, Institute of Neuroscience, The Medical School, Newcastle University, Framlington Place, Newcastle upon Tyne, Tyne and Wear, NE2 4HH, UK
| | - R W Taylor
- Mitochondrial Research Group, Institute of Neuroscience, The Medical School, Newcastle University, Framlington Place, Newcastle upon Tyne, Tyne and Wear, NE2 4HH, UK
| | - P G Blain
- The Medical Toxicology Centre, and NIHR HPRU in Chemical and Radiation Threats and Hazards, Wolfson Building, Newcastle University, Claremont Place, Newcastle upon Tyne, Tyne and Wear, NE2 4AA, UK
| | - C M Morris
- The Medical Toxicology Centre, and NIHR HPRU in Chemical and Radiation Threats and Hazards, Wolfson Building, Newcastle University, Claremont Place, Newcastle upon Tyne, Tyne and Wear, NE2 4AA, UK.
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22
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Jackson-Lewis V, Lester D, Kozina E, Przedborski S, Smeyne RJ. From Man to Mouse. Mov Disord 2015. [DOI: 10.1016/b978-0-12-405195-9.00017-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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23
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Fukushima T, Tanaka K, Lim H, Moriyama M. Mechanism of cytotoxicity of paraquat. Environ Health Prev Med 2012; 7:89-94. [PMID: 21432289 DOI: 10.1265/ehpm.2002.89] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2002] [Accepted: 03/14/2002] [Indexed: 11/09/2022] Open
Abstract
Acute paraquat poisoning seems to be very complex because many possible mechanisms of paraquat cytotoxicity have been reported. Some may not be the cause of paraquat poisoning but the result or an accompanying phenomenon of paraquat action. The mechanism critical for cell damage is still unknown. Paraquat poisoning is probably a combination of several paraquat actions. Arguing which mechanism is more critical may not be important, and these clarified mechanisms should be connected and utilized in the development of treatment for paraquat poisoning. Many people still die of pulmonary fibrosis after paraquat exposure. The next target of study will be to verify the mechanism of pulmonary fibrosis by paraquat on the basis of the outcome of studies such as this review.
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Affiliation(s)
- Tetsuhito Fukushima
- Department of Public Health, School of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, 814-0180, Fukuoka, Japan,
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24
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Djukic MM, Jovanovic MD, Ninkovic M, Stevanovic I, Ilic K, Curcic M, Vekic J. Protective role of glutathione reductase in paraquat induced neurotoxicity. Chem Biol Interact 2012; 199:74-86. [DOI: 10.1016/j.cbi.2012.05.008] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2012] [Revised: 05/19/2012] [Accepted: 05/21/2012] [Indexed: 11/16/2022]
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25
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Jiao Y, Lu L, Williams RW, Smeyne RJ. Genetic dissection of strain dependent paraquat-induced neurodegeneration in the substantia nigra pars compacta. PLoS One 2012; 7:e29447. [PMID: 22291891 PMCID: PMC3265472 DOI: 10.1371/journal.pone.0029447] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2011] [Accepted: 11/28/2011] [Indexed: 02/03/2023] Open
Abstract
The etiology of the vast majority of Parkinson's disease (PD) cases is unknown. It is generally accepted that there is an interaction between exposures to environmental agents with underlying genetic sensitivity. Recent epidemiological studies have shown that people living in agricultural communities have an increased risk of PD. Within these communities, paraquat (PQ) is one of the most utilized herbicides. PQ acts as a direct redox cycling agent to induce formation of free radicals and when administered to mice induces the cardinal symptoms of parkinsonism, including loss of TH+-positive dopaminergic (DA) neurons in the ventral midbrain's substantia nigra pars compacta (SNpc). Here we show that PQ-induced SNpc neuron loss is highly dependent on genetic background: C57BL/6J mice rapidly lose ∼50% of their SNpc DA neurons, whereas inbred Swiss-Webster (SWR/J) mice do not show any significant loss. We intercrossed these two strains to map quantitative trait loci (QTLs) that underlie PQ-induced SNpc neuron loss. Using genome-wide linkage analysis we detected two significant QTLs. The first is located on chromosome 5 (Chr 5) centered near D5Mit338, whereas the second is on Chr 14 centered near D14Mit206. These two QTLs map to different loci than a previously identified QTL (Mptp1) that controls a significant portion of strain sensitivity to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP), suggesting that the mechanism of action of these two parkinsonian neurotoxins are different.
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Affiliation(s)
- Yun Jiao
- Department of Developmental Neurobiology, Saint Jude Children's Research Hospital, Memphis, Tennessee, United States of America
| | - Lu Lu
- Department of Anatomy and Neurobiology, Center for Integrative and Translational Genomics, University of Tennessee Health Science Center, Memphis, Tennessee, United States of America
| | - Robert W. Williams
- Department of Anatomy and Neurobiology, Center for Integrative and Translational Genomics, University of Tennessee Health Science Center, Memphis, Tennessee, United States of America
| | - Richard J. Smeyne
- Department of Developmental Neurobiology, Saint Jude Children's Research Hospital, Memphis, Tennessee, United States of America
- * E-mail:
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Zhao H, Kim G, Liu C, Levine RL. Transgenic mice overexpressing methionine sulfoxide reductase A: characterization of embryonic fibroblasts. Free Radic Biol Med 2010; 49:641-8. [PMID: 20510353 PMCID: PMC3391185 DOI: 10.1016/j.freeradbiomed.2010.05.017] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/09/2010] [Revised: 05/13/2010] [Accepted: 05/17/2010] [Indexed: 01/09/2023]
Abstract
Methionine residues in protein can be oxidized by reactive oxygen species to generate methionine sulfoxide. Aerobic organisms have methionine sulfoxide reductases capable of reducing methionine sulfoxide back to methionine. Methionine sulfoxide reductase A acts on the S-epimer of methionine sulfoxide, and it is known that altering its cellular level by genetic ablation or overexpression has notable effects on resistance to oxidative stress and on life span in species from microorganisms to animals. In mammals, the enzyme is present in both the cytosol and the mitochondria, and this study was undertaken to assess the contribution of each subcellular compartment's reductase activity to resistance against oxidative stresses. Nontransgenic mouse embryonic fibroblasts lack methionine sulfoxide reductase A activity, providing a convenient cell type to determine the effects of expression of the enzyme in each compartment. We created transgenic mice with methionine sulfoxide reductase A targeted to the cytosol, mitochondria, or both and studied embryonic fibroblasts derived from each line. Unexpectedly, none of the transgenic cells gained resistance to a variety of oxidative stresses even though the expressed enzymes were catalytically active when assayed in vitro. Noting that activity in vivo requires thioredoxin and thioredoxin reductase, we determined the levels of these proteins in the fibroblasts and found that they were very low in both the nontransgenic and the transgenic cells. We conclude that overexpression of methionine sulfoxide reductase A did not confer resistance to oxidative stress because the cells lacked other proteins required to constitute a functional methionine sulfoxide reduction system.
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Affiliation(s)
- Hang Zhao
- Laboratory of Biochemistry, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Geumsoo Kim
- Laboratory of Biochemistry, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Chengyu Liu
- Transgenic Mouse Core Facility, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
| | - Rodney L. Levine
- Laboratory of Biochemistry, National Heart, Lung and Blood Institute, National Institutes of Health, Bethesda, Maryland 20892, USA
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Abdulwahid Arif I, Ahmad Khan H. Environmental toxins and Parkinson's disease: putative roles of impaired electron transport chain and oxidative stress. Toxicol Ind Health 2010; 26:121-8. [PMID: 20207656 DOI: 10.1177/0748233710362382] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Despite recent advancements in the biomedical fields, the etiology and pathogenesis of Parkinson's disease (PD) is still poorly understood, though the crucial roles of oxidative stress and impaired mitochondrial respiration have been suggested in the development of PD. The oxidative modification of the proteins of mitochondrial electron transport chain alters their normal function leading to the state of energy crisis in neurons. Exposure of environmental chemicals such as 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) and rotenone in mouse produces the symptoms akin to PD and therefore these neurotoxins are commonly used in experimental studies on PD. Another environmental toxin, paraquat (a commonly used herbicide) has also been implicated with the onset of PD. The neurotoxicity of these chemicals is accompanied by the blockade of electron flow from NADH dehydrogenase to coenzyme Q. The agents with the ability to improve mitochondrial respiration and ATP production have been shown to exert beneficial effects in PD patients as well as in the animal models of PD. This review summarizes the current research implicating the impairment of mitochondrial respiratory chain and the role of environmental toxins in the pathogenesis of PD.
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Affiliation(s)
- Ibrahim Abdulwahid Arif
- Environmental Analysis Unit, Prince Sultan Research Chair for Environment and Wildlife, College of Sciences, King Saud University, Riyadh, Saudi Arabia
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Glycogen synthase kinase 3β and its phosphorylated form (Y216) in the paraquat-induced model of parkinsonism. Neurotox Res 2010; 19:162-71. [PMID: 20143200 DOI: 10.1007/s12640-010-9153-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2009] [Revised: 01/08/2010] [Accepted: 01/18/2010] [Indexed: 12/21/2022]
Abstract
Parkinson's disease is a slowly progressing disease, due to a lesion of dopaminergic neurons in the substantia nigra and a dramatic loss of dopamine in the striatum. It is now accepted that several environmental agents including the herbicide paraquat (PQ) may contribute to its pathogenesis. However, till now nothing is known about the role of glycogen synthase kinase-3β (GSK-3β) in the PQ toxicity. Therefore, the aim of this study was to examine the influence of 37-week administration of PQ in rats on the immunohistochemically measured levels of the total GSK-3β and its active, tyrosine 216 (pY216)-phosphorylated form in subcellular fractions of the midbrain with pons, as well as of the striatum. The present results revealed that the long-term PQ administration increased the levels of total and active forms of GSK-3β in the midbrain with pons, whereas decreased them in the striatum. Examination of the lesion extent showed a decrease in the number of tyrosine-immunoreactive neurons in the substantia nigra pars compacta, ventral tegmental area, and locus coeruleus, as well as lower DOPAC/dopamine ratio and noradrenaline level in the striatum in rats treated with PQ. The long-term PQ administration disturbed also motor activity of rats. Summarizing, the present data indicate that the long-term exposure of rats to PQ, a commonly used herbicide, diversely alters levels of GSK-3β in different brain structures, which may be associated with their vulnerability to its toxicity.
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Abstract
Mutations in leucine-rich repeat kinase 2 (LRRK2) cause autosomal-dominant familial Parkinson's disease. We generated lines of Caenorhabditis elegans expressing neuronally directed human LRRK2. Expressing human LRRK2 increased nematode survival in response to rotenone or paraquat, which are agents that cause mitochondrial dysfunction. Protection by G2019S, R1441C, or kinase-dead LRRK2 was less than protection by wild-type LRRK2. Knockdown of lrk-1, the endogenous ortholog of LRRK2 in C. elegans, reduced survival associated with mitochondrial dysfunction. C. elegans expressing LRRK2 showed rapid loss of dopaminergic markers (DAT::GFP fluorescence and dopamine levels) beginning in early adulthood. Loss of dopaminergic markers was greater for the G2019S LRRK2 line than for the wild-type line. Rotenone treatment induced a larger loss of dopamine markers in C. elegans expressing G2019S LRRK2 than in C. elegans expressing wild-type LRRK2; however, loss of dopaminergic markers in the G2019S LRRK2 nematode lines was not statistically different from that in the control line. These data suggest that LRRK2 plays an important role in modulating the response to mitochondrial inhibition and raises the possibility that mutations in LRRK2 selectively enhance the vulnerability of dopaminergic neurons to a stressor associated with Parkinson's disease.
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Mitochondrial complex I inhibition is not required for dopaminergic neuron death induced by rotenone, MPP+, or paraquat. Proc Natl Acad Sci U S A 2008; 105:15136-41. [PMID: 18812510 DOI: 10.1073/pnas.0807581105] [Citation(s) in RCA: 190] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Inhibition of mitochondrial complex I is one of the leading hypotheses for dopaminergic neuron death associated with Parkinson's disease (PD). To test this hypothesis genetically, we used a mouse strain lacking functional Ndufs4, a gene encoding a subunit required for complete assembly and function of complex I. Deletion of the Ndufs4 gene abolished complex I activity in midbrain mesencephalic neurons cultured from embryonic day (E) 14 mice, but did not affect the survival of dopaminergic neurons in culture. Although dopaminergic neurons were more sensitive than other neurons in these cultures to cell death induced by rotenone, MPP(+), or paraquat treatments, the absence of complex I activity did not protect the dopaminergic neurons, as would be expected if these compounds act by inhibiting complex 1. In fact, the dopaminergic neurons were more sensitive to rotenone. These data suggest that dopaminergic neuron death induced by treatment with rotenone, MPP(+), or paraquat is independent of complex I inhibition.
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Mohammadi-Bardbori A, Ghazi-Khansari M. Alternative electron acceptors: Proposed mechanism of paraquat mitochondrial toxicity. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2008; 26:1-5. [PMID: 21783880 DOI: 10.1016/j.etap.2008.02.009] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/05/2007] [Revised: 02/14/2008] [Accepted: 02/19/2008] [Indexed: 05/31/2023]
Abstract
Paraquat (PQ) is a relatively safe and effective herbicide used all over the world. PQ is very toxic to all living organisms; and many cases of acute poisoning and death have been reported over the past decade. The main suggested potential mechanism for PQ toxicity is the production of superoxide radicals from the metabolism of the PQ by microsomal enzyme systems, and by inducing mitochondrial toxicity. Mitochondria are considered to be a major source of reactive oxygen species in cells and according to this hypothesis, PQ, through suitable oxidation and reduction processes, is able to participate in the redox system in mitochondria. The potential ability of PQ to accept electrons from complex (I, II, III, IV) leads to rapid reaction with molecular oxygen to yield superoxide anion which can lead to the formation of more toxic reactive oxygen species, e.g., hydroxyl radical, often taken as the main toxicant. Lipid peroxidation due to PQ has been implicated in a number of deleterious effects such as increased membrane rigidity, osmotic fragility, decreased mitochondrial components, reduced mitochondrial survival and lipid fluidity. The biological effect of reactive oxygen species (ROS) is controlled by a wide spectrum of enzymatic and non-enzymatic defense mechanisms such as superoxide dismutas (SOD), catalase (CAT) and glutathione. According to this hypothesis, the chemical cascades lead to the reduction of PQ, which reacts quite rapidly with molecular oxygen to yield superoxide anion. The generation of free radicals and lipid peroxidation are the main factors that lead to mitochondrial damage.
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Affiliation(s)
- A Mohammadi-Bardbori
- Shiraz University of Medical Sciences, Faculty of Pharmacy, P.O. Box 71345-1583, Shiraz, Iran; Department of Pharmacology, School of Medicine, P. O. Box 13145-784, Medical Sciences/University of Tehran, Tehran, Iran
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Runko AP, Griswold AJ, Min KT. Overexpression of frataxin in the mitochondria increases resistance to oxidative stress and extends lifespan in Drosophila. FEBS Lett 2008; 582:715-9. [PMID: 18258192 DOI: 10.1016/j.febslet.2008.01.046] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2007] [Revised: 01/02/2008] [Accepted: 01/28/2008] [Indexed: 11/20/2022]
Abstract
In Friedreich's ataxia, reduction of the mitochondria protein frataxin results in the accumulation of iron and reactive oxygen species, which leads to oxidative damage, neurodegeneration and a diminished lifespan. Recent studies propose that frataxin might play a role in the antioxidative process. Here we show that overexpression of Drosophila frataxin in the mitochondria of female transgenic animals increases antioxidant capability, resistance to oxidative stress insults, and longevity. This suggests that Drosophila frataxin may function to protect the mitochondria from oxidative stresses and the ensuing cellular damage.
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Affiliation(s)
- Alexander P Runko
- Porter Neuroscience Research Center, MSC 3705, NINDS, NIH, Bethesda, MD 20892, USA
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Kuter K, Smiałowska M, Wierońska J, Zieba B, Wardas J, Pietraszek M, Nowak P, Biedka I, Roczniak W, Konieczny J, Wolfarth S, Ossowska K. Toxic influence of subchronic paraquat administration on dopaminergic neurons in rats. Brain Res 2007; 1155:196-207. [PMID: 17493592 DOI: 10.1016/j.brainres.2007.04.018] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2007] [Revised: 04/04/2007] [Accepted: 04/07/2007] [Indexed: 10/23/2022]
Abstract
Paraquat is a toxin suggested to contribute to pathogenesis of Parkinson's disease. The aim of the present study was to examine toxic influence of subchronic treatment with this pesticide (5 days, one injection per day, 2-3 days of withdrawal) on dopaminergic, serotonergic, noradrenergic and GABAergic neurons. Paraquat decreased the number of tyrosine hydroxylase-immunoreactive (TH-ir) neurons in the substantia nigra by 22% (measured 3 days after withdrawal). Two days after withdrawal the levels of the dopamine metabolites and dopamine turnover in the caudate-putamen, substantia nigra and prefrontal cortex were reduced by ca. 20-60%, and the binding of [(3)H]GBR 12,935 to dopamine transporter dropped by 25-40% in the caudate-putamen. Three days after paraquat withdrawal, the level of dopamine in the caudate-putamen was significantly increased, and earlier decreases in DOPAC and HVA in the substantia nigra, as well as [(3)H]GBR 12,935 binding in the caudate-putamen were reversed. Moreover, an increase in serotonin turnover in the caudate-putamen and prefrontal cortex, and noradrenaline level in the former structure was observed 2-3 days after paraquat withdrawal. Three days after the last paraquat injection 24-35% decreases in the proenkephalin mRNA levels and 5-7% reduction in glutamic acid decarboxylase (GAD)67 mRNA were found in the caudate-putamen. The present study suggests that subchronic paraquat administration triggers processes characteristic of early stages of dopaminergic neuron degeneration, and activates compensatory mechanisms involving dopaminergic, noradrenergic, serotonergic and GABAergic transmissions.
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Affiliation(s)
- Katarzyna Kuter
- Department of Neuro-Psychopharmacology, Institute of Pharmacology, Polish Academy of Sciences, Kraków, Poland
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Maracchioni A, Totaro A, Angelini DF, Di Penta A, Bernardi G, Carrì MT, Achsel T. Mitochondrial damage modulates alternative splicing in neuronal cells: implications for neurodegeneration. J Neurochem 2006; 100:142-53. [PMID: 17064354 DOI: 10.1111/j.1471-4159.2006.04204.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mitochondrial damage is linked to many neurodegenerative conditions, such as Parkinson's disease, Alzheimer's disease and amyotrophic lateral sclerosis. These diseases are associated with changes in the splicing pattern of individual mRNAs. Here, we tested the hypothesis that mitochondrial damage modulates alternative splicing, not only of a few mRNAs, but in a general manner. We incubated cultured human neuroblastoma cells with the chemical agent paraquat (a neurotoxin that interferes with mitochondrial function, causing energy deficit and oxidative stress) and analysed the splicing pattern of 13 genes by RT-PCR. For all mRNAs that are alternatively spliced, we observed a dose- and time-dependent increase of the smaller isoforms. In contrast, splicing of all constitutive splicing exons that we monitored did not change. Using other drugs, we show that the modulation of alternative splicing correlates with ATP depletion, not with oxidative stress. Such drastic changes in alternative splicing are not observed in cell lines of non-neuronal origin, suggesting a selective susceptibility of neuronal cells to modulation of splicing. As a significant percentage of all mammalian mRNAs undergo alternative splicing, we predict that mitochondrial failure will unbalance a vast number of isoform equilibriums, which would give an important contribution to neurodegeneration.
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Affiliation(s)
- Alessia Maracchioni
- Department of Experimental Neurosciences, European Centre for Brain Research, Fondazione Santa Lucia IRCCS, Rome, Italy
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Kinoshita A, Kobayashi D, Saitoh Y, Tanabe N, Uchino K, Nishiguchi K, Okumura K, Komada F. Regulation of Exogenous Gene Expression by Superoxide. Pharm Res 2006; 23:2536-41. [PMID: 17048122 DOI: 10.1007/s11095-006-9076-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2005] [Accepted: 06/02/2006] [Indexed: 10/24/2022]
Abstract
PURPOSE Regulation of gene expression after gene introduction is a problematic aspect of gene therapy. Transcription regulates gene-specific transcriptional factors, which bind to regulatory regions in the promoter. The cytomegalovirus long terminal repeat (CMV-LTR) has a TPA response element (TRE) as a binding site for activator protein 1 (AP-1), which is induced by oxidative stress. The purpose of this study was to regulate exogenous gene expression in a vector with CMV-LTR using oxygen radicals. METHODS We used two plasmids (1) pQBI25 encoding CMV-LTR and red-shift green fluorescent protein (rsGFP) cDNA and (2) pRc/CMV-SOD encoding CMV-LTR and human Cu, Zn-superoxide dismutase (SOD) cDNA. FR cells were transfected with pQBI25 (FR-pQBI25 cells), and L2 cells were transfected with pRc/CMV-SOD (L2-pRc/CMV-SOD cells). Each type of cell was exposed to oxygen radicals using paraquat for 24 h. Levels of c-fos, c-jun and rsGFP mRNAs were determined using reverse transcription polymerase chain reaction (RT-PCR). Levels of rsGFP protein were measured by fluorometry. Total SOD activity was measured using the nitrite method. RESULTS Levels of c-fos, c-jun (AP-1 composition protein) and rsGFP mRNA were induced significantly by oxygen radical exposure in FR-pQBI25 cells. A positive correlation was observed between levels of c-fos mRNA and rsGFP mRNA and also between levels of c-jun mRNA and rsGFP mRNA. Levels of rsGFP protein were also induced significantly. Total SOD activity was induced significantly by oxygen radical exposure in L2-pRc/CMV-SOD cells. CONCLUSIONS This study suggests that gene expression driven by the CMV- LTR promoter may be regulated by oxygen radicals.
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Affiliation(s)
- Atsushi Kinoshita
- Department of Drug Informatics, Faculty of Pharmaceutical Sciences, Josai University, 1-1, Keyakidai, Sakado, Saitama, 350-0248, Japan
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Dinis-Oliveira RJ, Remião F, Duarte JA, Ferreira R, Sánchez Navarro A, Bastos ML, Carvalho F. P-glycoprotein induction: an antidotal pathway for paraquat-induced lung toxicity. Free Radic Biol Med 2006; 41:1213-24. [PMID: 17015168 DOI: 10.1016/j.freeradbiomed.2006.06.012] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/06/2006] [Revised: 06/26/2006] [Accepted: 06/27/2006] [Indexed: 01/12/2023]
Abstract
The widespread use of the nonselective contact herbicide paraquat (PQ) has been the cause of thousands of deaths from both accidental and voluntary ingestion. The main target organ for PQ toxicity is the lung. No antidote or effective treatment to decrease PQ accumulation in the lung or to disrupt its toxicity has yet been developed. The present study describes a procedure that leads to a remarkable decrease in PQ accumulation in the lung, together with an increase in its fecal excretion and a subsequent decrease in several biochemical and histopathological biomarkers of toxicity. The administration of dexamethasone (100 mg/kg ip) to Wistar rats, 2 h after PQ intoxication (25 mg/kg ip), decreased the lung PQ accumulation to about 40% of the group exposed to only PQ and led to an improvement in tissue healing in just 24 h as a result of the induction of de novo synthesis of P-glycoprotein (P-gp). The involvement of P-gp in these effects was confirmed by Western blot analysis and by the use of a competitive inhibitor of this transporter, verapamil (10 mg/kg ip), which, given 1 h before dexamethasone, blocked its protective effects, causing instead an increase in lung PQ concentration and an aggravation of toxicity. In conclusion, the induction of P-gp, leading to a decrease in lung levels of PQ and the consequent prevention of toxicity, seems to be a new and promising treatment for PQ poisonings that should be further clinically tested.
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Affiliation(s)
- R J Dinis-Oliveira
- REQUIMTE, Department of Toxicology, Faculty of Pharmacy, University of Porto, 4099-030 Porto, Portugal.
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Single high dose dexamethasone treatment decreases the pathological score and increases the survival rate of paraquat-intoxicated rats. Toxicology 2006; 227:73-85. [PMID: 16956706 DOI: 10.1016/j.tox.2006.07.025] [Citation(s) in RCA: 88] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2006] [Revised: 07/13/2006] [Accepted: 07/14/2006] [Indexed: 11/27/2022]
Abstract
Dexamethasone (DEX), a synthetic corticosteroid, has been successfully used in clinical practice during paraquat (PQ) poisonings due to its anti-inflammatory activity, although, as recently observed, its effects related to de novo synthesis of P-glycoprotein (P-gp), may also strongly contribute for its healing effects. The main purpose of this study was to evaluate the effects of a single high dose DEX administration, which induces de novo synthesis of P-gp, in the histological and biochemical parameters in lung, liver, kidney and spleen of acute PQ-intoxicated rats. Four groups of rats were constituted: (i) control group, (ii) DEX group (100 mg/kg i.p.), (iii) PQ group (25mg/kg i.p.) and (iv) PQ+DEX group (DEX injected 2h after PQ). The obtained results showed that DEX ameliorated the biochemical and histological lung and liver alterations induced by PQ in Wistar rats at the end of 24 hours. This was evidenced by a significant reduction in lipid peroxidation (LPO) and carbonyl groups content, as well as by normalization of the myeloperoxidase (MPO) activities. Moreover, DEX prevented the increase of relative lung weight. On the other hand, these improvements were not observed in kidney and spleen of DEX treated rats. Conversely, an increase of LPO and carbonyl groups content and aggravation of histological damages were observed in the latter tissues. In addition, MPO activity increased in the spleen of PQ+DEX group and urinary N-acetyl-beta-D-glucosaminidase activity, a biomarker of renal tubular proximal damage, also augmented in this group. Nevertheless, it is legitimate to hypothesize that the apparent protection of high dosage DEX treatment awards to the lungs of the PQ-intoxicated animals outweighs the increased damage to their spleens and kidneys, because a higher survival rate was observed, indicating that DEX treatment may constitute an important and valuable therapeutic drug to be used against PQ-induced toxicity.
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Dinis-Oliveira RJ, De Jesús Valle MJ, Bastos ML, Carvalho F, Sánchez Navarro A. Kinetics of paraquat in the isolated rat lung: Influence of sodium depletion. Xenobiotica 2006; 36:724-37. [PMID: 16891252 DOI: 10.1080/00498250600790331] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
Paraquat accumulates in the lung through a characteristic polyamine uptake system. It has been previously shown that paraquat uptake can be significantly prevented if extracellular sodium (Na+) is reduced, although the available data correspond to experiments performed using tissue slices or incubated cells. This type of in vitro study fails to give information on the actual behaviour occurring in vivo since the anatomy and physiology of the studied tissue is disrupted. Accordingly, the aim of the present study was to explore the usefulness of the isolated rat lung model when applied to characterize the kinetic behaviour of paraquat in this tissue after bolus injection under standard experimental conditions as well as to evaluate the influence of iso-osmotic replacement of Na+ by lithium (Li+) in the perfusion medium. The obtained results show that the present isolated rat lung model is useful for the analysis of paraquat toxicokinetics, which is reported herein for the first time. It was also observed that Na+ depletion in the perfusion medium leads to a decreased uptake of paraquat in the isolated rat lung, although it seems that this condition does not contribute to improve the elimination of paraquat once the herbicide reaches the extravascular structures of the tissue, since the paraquat tissue wash-out phase is similar under both experimental conditions assayed.
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Affiliation(s)
- R J Dinis-Oliveira
- Department of Toxicology, University of Porto, REQUIMTE, Porto, Portugal
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Dinis-Oliveira RJ, Remião F, Carmo H, Duarte JA, Navarro AS, Bastos ML, Carvalho F. Paraquat exposure as an etiological factor of Parkinson's disease. Neurotoxicology 2006; 27:1110-22. [PMID: 16815551 DOI: 10.1016/j.neuro.2006.05.012] [Citation(s) in RCA: 230] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2006] [Revised: 04/12/2006] [Accepted: 05/09/2006] [Indexed: 01/06/2023]
Abstract
Parkinson's disease (PD) is a multifactorial chronic progressive neurodegenerative disease influenced by age, and by genetic and environmental factors. The role of genetic predisposition in PD has been increasingly acknowledged and a number of relevant genes have been identified (e.g., genes encoding alpha-synuclein, parkin, and dardarin), while the search for environmental factors that influence the pathogenesis of PD has only recently begun to escalate. In recent years, the investigation on paraquat (PQ) toxicity has suggested that this herbicide might be an environmental factor contributing to this neurodegenerative disorder. Although the biochemical mechanism through which PQ causes neurodegeneration in PD is not yet fully understood, PQ-induced lipid peroxidation and consequent cell death of dopaminergic neurons can be responsible for the onset of the Parkinsonian syndrome, thus indicating that this herbicide may induce PD or influence its natural course. PQ has also been recently considered as an eligible candidate for inducing the Parkinsonian syndrome in laboratory animals, and can therefore constitute an alternative tool in suitable animal models for the study of PD. In the present review, the recent evidences linking PQ exposure with PD development are discussed, with the aim of encouraging new perspectives and further investigation on the involvement of environmental agents in PD.
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Affiliation(s)
- R J Dinis-Oliveira
- REQUIMTE, Department of Toxicology, Faculty of Pharmacy, University of Porto, Rua Aníbal Cunha, 164, 4099-030 Porto, Portugal.
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Ossowska K, Smiałowska M, Kuter K, Wierońska J, Zieba B, Wardas J, Nowak P, Dabrowska J, Bortel A, Biedka I, Schulze G, Rommelspacher H. Degeneration of dopaminergic mesocortical neurons and activation of compensatory processes induced by a long-term paraquat administration in rats: implications for Parkinson's disease. Neuroscience 2006; 141:2155-65. [PMID: 16797138 DOI: 10.1016/j.neuroscience.2006.05.039] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2006] [Revised: 05/18/2006] [Accepted: 05/18/2006] [Indexed: 12/28/2022]
Abstract
A deficiency of the dopaminergic transmission in the mesocortical system has been suggested to contribute to cognitive disturbances in Parkinson's disease. Therefore, the aim of the present study was to examine whether the long-term administration of a commonly used herbicide, paraquat, which has already been found to induce a slowly progressing degeneration of the nigrostriatal neurons, influences mesocortical dopaminergic neurons in rats. Paraquat at a dose of 10 mg/kg i.p. was injected either acutely or once a week for 4, 8, 12 and 24 weeks. Acute treatment with this pesticide increased the level of homovanillic acid (HVA) and HVA/dopamine ratio in the prefrontal cortex. After 8 weeks of administration paraquat increased the number of stereologically counted tyrosine hydroxylase-immunoreactive (TH-ir) neurons and their staining intensity in the ventral tegmental area (VTA), which is a source of the mesocortical dopaminergic projection. At the same time, few TH-ir neurons appeared in different regions of the cerebral cortex: in the frontal, cingulate, retrosplenial and parietal cortices. Chronic paraquat administration did not influence the level of dopamine in the prefrontal cortex but increased the levels of its metabolites: 3,4-dihydroxyphenylacetic acid (after 8-12 weeks), HVA (after 4 and 12 weeks) and HVA/dopamine ratio (4 weeks). After 24 weeks this pesticide reduced the number of TH-ir neurons in the VTA by 42% and of the Nissl-stained neurons by 26%, and induced shrinkage of this structure by ca. 25%. Moreover, TH-ir neurons in the cortex were no more visible after such a long period of administration and levels of dopamine metabolites returned to control values. The present results suggest that the long-term paraquat administration destroys dopaminergic neurons of the VTA. However, compensatory activation of the VTA neurons and cortex overcomes progressing degeneration and maintains cortical dopaminergic transmission.
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Affiliation(s)
- K Ossowska
- Department of Neuro-Psychopharmacology, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna St., PL-31-343 Kraków, Poland.
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41
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Mele J, Van Remmen H, Vijg J, Richardson A. Characterization of transgenic mice that overexpress both copper zinc superoxide dismutase and catalase. Antioxid Redox Signal 2006; 8:628-38. [PMID: 16677106 DOI: 10.1089/ars.2006.8.628] [Citation(s) in RCA: 44] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Transgenic mice overexpressing both Cu/ZnSOD and catalase [Tg(SOD1/CAT) +/o] were used to evaluate the effects of overexpression of both genes against oxidative stress. Characterization of these transgenic mice revealed that catalase or Cu/ZnSOD activities were two- to fourfold higher in the tissues of transgenic mice compared to wild-type mice, and the activities of the other major antioxidant enzymes were not altered in the tissues of the transgenic mice. The murine embryonic fibroblasts (MEFs) from the Tg(SOD1/CAT) +/o and MEFs overexpressing Cu/ZnSOD were more resistant to paraquat cytotoxicity, relative to wild-type MEFs. The MEFs from Tg(SOD1/CAT) +/o tended to be more resistant (up to 2.25-fold) to paraquat cytotoxicity than MEFs overexpressing either Cu/ZnSOD or catalase alone. MEFs from Tg(CAT) +/o and Tg(SOD1/CAT) +/o were equally as resistant to hydrogen peroxide cytotoxicity. However, there were no significant differences in whole animal survival against either paraquat or gamma-radiation.
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Affiliation(s)
- James Mele
- Department of Cellular and Structural Biology, University of Texas Health Science Center at San Antonio, San Antonio, Texas 78229-3900, USA
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42
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Ossowska K, Wardas J, Smiałowska M, Kuter K, Lenda T, Wierońska JM, Zieba B, Nowak P, Dabrowska J, Bortel A, Kwieciński A, Wolfarth S. A slowly developing dysfunction of dopaminergic nigrostriatal neurons induced by long-term paraquat administration in rats: an animal model of preclinical stages of Parkinson's disease? Eur J Neurosci 2005; 22:1294-304. [PMID: 16190885 DOI: 10.1111/j.1460-9568.2005.04301.x] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The aim of the present study was to examine the influence of the long-term paraquat administration on the dopaminergic nigrostriatal system in rats. Paraquat was injected at a dose of 10 mg/kg i.p. for 4-24 weeks. We found that this pesticide reduced the number of tyrosine hydroxylase-immunoreactive neurons of the substantia nigra; after the 4-week treatment the reduction (17%, nonsignificant) was confined to the rostrocentral region of this structure but, after 24 weeks, had spread along its whole length and was approximately 37%. Moreover, it induced a biphasic effect on dopaminergic transmission. First, levels of dopamine, its metabolites and turnover were elevated (4-8 weeks) in the caudate-putamen, then all these parameters returned to control values (12 weeks) and dropped by 25-30% after 24 weeks. The binding of [3H]GBR 12,935 to dopamine transporter in the caudate-putamen was decreased after 4-8 weeks, then returned to control values after 12 weeks but was again decreased after 24 weeks. Twenty-four-week paraquat administration also decreased the level of tyrosine hydroxylase (Western blot) in the caudate-putamen. In addition, paraquat activated serotonin and noradrenaline transmission during the first 12 weeks of treatment but no decreases in levels of these neurotransmitters were observed after 24 weeks. The above results seem to suggest that long-term paraquat administration produces a slowly progressing degeneration of nigrostriatal neurons, leading to delayed deficits in dopaminergic transmission, which may resemble early, presymptomatic, stages of Parkinson's disease.
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Affiliation(s)
- K Ossowska
- Department of Neuro-Psychopharmacology, Institute of Pharmacology, Polish Academy of Sciences, 12 Smetna St., 31-343 Kraków, Poland.
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Richardson JR, Quan Y, Sherer TB, Greenamyre JT, Miller GW. Paraquat neurotoxicity is distinct from that of MPTP and rotenone. Toxicol Sci 2005; 88:193-201. [PMID: 16141438 DOI: 10.1093/toxsci/kfi304] [Citation(s) in RCA: 163] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Paraquat, MPTP, and rotenone reproduce features of Parkinson's disease (PD) in experimental animals. The exact mechanisms by which these compounds damage the dopamine system are not firmly established, but selective damage to dopamine neurons and inhibition of complex I are thought to be involved. We and others have previously documented that the toxic metabolite of MPTP, MPP+, is transported into dopamine neurons through the dopamine transporter (DAT), while rotenone is not transported by DAT. We have also demonstrated the requirement for complex I inhibition and oxidative damage in the dopaminergic neurodegeneration produced by rotenone. Based on structural similarity to MPP+, it has been proposed that paraquat exerts selective dopaminergic toxicity through transport by the DAT and subsequent inhibition of mitochondrial complex I. In this study we report that paraquat is neither a substrate nor inhibitor of DAT. We also demonstrate that in vivo exposure to MPTP and rotenone, but not paraquat, inhibits binding of 3H-dihydrorotenone to complex I in brain mitochondria. Rotenone and MPP+ were both effective inhibitors of complex I activity in isolated brain mitochondria, while paraquat exhibited weak inhibitory effects only at millimolar concentrations. These data indicate that, despite the apparent structural similarity to MPP+, paraquat exerts its deleterious effects on dopamine neurons in a manner that is unique from rotenone and MPTP.
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Affiliation(s)
- Jason R Richardson
- Center for Neurodegenerative Disease, School of Medicine and Department of Environmental and Occupational Health, Rollins School of Public Health, Emory University, Atlanta, Georgia 30322, USA
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Isaev NK, Stelmashook EV, Ruscher K, Andreeva NA, Zorov DB. Menadione reduces rotenone-induced cell death in cerebellar granule neurons. Neuroreport 2005; 15:2227-31. [PMID: 15371739 DOI: 10.1097/00001756-200410050-00017] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
Oxidative stress has been implicated in neuronal death caused by cerebral ischemia or some neurologic disorders. Chemical hypoxia (term defining the simulation by using respiratory inhibitors) chosen as in vitro ischemic model, was induced in primary cultures of rat cerebellar granule neurons by inhibitors of mitochondrial electron transport such as rotenone or paraquat (complex I), 3-nitropropionic acid (3-NPA, complex II), antimycin A (complex III), or sodium azide (complex IV). All compounds caused neuronal death determined by trypan blue staining and MTT-test. On the other hand, neurotoxicity of rotenone and paraquat but not of 3-NPA, antimycin or azide was significantly abolished by menadione (vitamin K3, 2-methyl-1,4-naphthoquinone). This neuroprotective effect of menadione was associated with a decrease of rotenone-induced free radical production.
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Affiliation(s)
- Nickolay K Isaev
- Department of Bioenergetics, AN Belozersky Institute of Physico-Chemical Biology, Moscow State University, 119992 Moscow, Russia
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Kaetsu A, Fukushima T, Inoue S, Lim H, Moriyama M. Role of heat shock protein 60 (HSP60) on paraquat intoxication. J Appl Toxicol 2001; 21:425-30. [PMID: 11746186 DOI: 10.1002/jat.774] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The possibility of establishing a new method of treatment against pulmonary fibrosis caused by acute paraquat intoxication, which takes into consideration the role of heat shock protein 60 (HSP60), was investigated in paraquat-exposed rat lung mitochondria. In polyacrylamide electrophoresis, mitochondrial protein bands appeared, especially in the range of molecular weight 60 kDa and higher, whereas protein bands disappeared in the 20-40 kDa range on the 4th day after paraquat exposure. The protein profile was normalized on the 7th day and no remarkable changes were seen thereafter up to the 56th day. The changes seen during the observation period were thought to reflect the course of paraquat-induced dysfunction and subsequent repair. The malondialdehyde concentration in mitochondria decreased until the 7th day but subsequently increased and recovered to normal levels by the 56th day. The relative density of HSP60 increased until the 7th day but subsequently decreased and recovered to normal levels by the 56th day. These two parameters therefore showed symmetrical changes. The change in the malondialdehyde concentration was thought to reflect the course of activation of the antioxidation function in mitochondria and the progression of repair. The change in the relative density of HSP60 was thought to have increased to repair the proteins affected by the paraquat radical and to have normalized with the progression of healing. These results suggest that HSP60 may play an important role in preventing the progression of pulmonary fibrosis induced by paraquat.
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Affiliation(s)
- A Kaetsu
- Department of Public Health, School of Medicine, Fukuoka University, 7-45-1 Nanakuma, Jonan-ku, Fukuoka 814-0180, Japan.
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Morita K, Tokunaga I, Kubo S. Cytotoxic effect of paraquat on rat C6 glioma cells: evidence for the possibility of non-oxidative damage to the cells. JAPANESE JOURNAL OF PHARMACOLOGY 1999; 79:121-4. [PMID: 10082327 DOI: 10.1254/jjp.79.121] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Although paraquat has been shown to cause oxidative damage to neuronal cells, little is known about its effect on glial cells. Thus the effect of paraquat on glial cells was examined using rat C6 glioma cells as a model system. Paraquat reduced cell viability in a concentration- and time-dependent manner, and this toxic effect was not significantly attenuated by various kinds of antioxidants. Furthermore, paraquat failed to increase 8-hydroxy-deoxyguanosine formation in the cells. These results indicate that paraquat can be toxic to glial cells and suggest that this cytotoxic effect may not be associated with the oxidative damage to the cells.
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Affiliation(s)
- K Morita
- Department of Pharmacology, Tokushima University School of Medicine, Japan
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Shimada H, Hirai K, Simamura E, Pan J. Mitochondrial NADH-quinone oxidoreductase of the outer membrane is responsible for paraquat cytotoxicity in rat livers. Arch Biochem Biophys 1998; 351:75-81. [PMID: 9500851 DOI: 10.1006/abbi.1997.0557] [Citation(s) in RCA: 68] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We investigated the existence of an NADH-dependent paraquat (PQ) reduction system in rat liver mitochondria (Mt) in respect to the cytotoxic mechanisms of PQ. The outer membrane fractions, free from the contamination of inner membranes but with a few microsomes, catalyzed rotenone-insensitive NADH, but not NADPH, oxidation by menadione or PQ. Anti-NADH-cytochrome b5 reductase antibody and its inhibitor p-hydroxymercuribenzonate did not inhibit the NADH-PQ reduction activity. Therefore, the respiratory systems of the inner membranes and microsomal cytochrome P450 systems could not have been responsible for the reaction. Dicoumarol, an inhibitor of NAD(P)H-quinone oxidoreductase (NQO), dose dependently suppressed the NADH oxidation in the outer membrane via PQ as well as menadione, with I50 values of 190 (for menadione) and 150 microM (for PQ). Because of a lower sensitivity to NADPH and the higher doses of dicoumarol required for its inhibition, the activity in the outer membrane may be an "NADH-quinone oxidoreductase" which partly differs from the NQO previously reported. This outer membrane enzyme produced superoxide anions in the presence of both NADH and PQ and was too tightly membrane-bound to be extracted by Triton X-100 and deoxycholate. From these results, we concluded that the free radical-producing mitochondrial NADH-quinone oxidoreductase is a novel oxidation-reduction system participating in PQ toxicity. This is in good agreement with our previous results showing that PQ selectively damaged Mt in vivo and in vitro, resulting in cell death (K.-I. Hirai et al., 1992, Toxicology 72, 1-16).
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Affiliation(s)
- H Shimada
- Department of Anatomy, Kanazawa Medical University, Ishikawa, Japan.
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Vornov JJ, Park J, Thomas AG. Regional vulnerability to endogenous and exogenous oxidative stress in organotypic hippocampal culture. Exp Neurol 1998; 149:109-22. [PMID: 9454620 DOI: 10.1006/exnr.1997.6673] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Organotypic cultures of the brain provide a unique opportunity to directly examine the regional vulnerability of specific brain regions like the hippocampus. Two well-characterized models of oxidative stress were used to examine the regional vulnerability of the hippocampus. Endogenous oxidative stress was induced by blocking synthesis of the endogenous antioxidant, glutathione with buthionine sulfoximine (BSO). Exogenous oxidative stress was induced with paraquat, an intracellular generator of superoxide. Injury was measured by quantitative fluorescence microscopy using the vital dye propidium iodide. BSO caused dose- and time-dependent injury that took at more than 24 h to develop. Injury began in discrete patches in the culture. In any given culture, each patch increased in size and intensity as incubation continued. The pattern was not clearly correlated with neuronal anatomy and may demonstrate glial vulnerability. Injury caused by BSO could be prevented with the antioxidants trolox or the 21-aminosteroid U-83836E, both of which are vitamin E derivatives. Paraquat also caused dose- and time-dependent injury, but the CA1 region of the hippocampus was most vulnerable. The same pattern of selective CA1 injury was caused by brief exposures to high concentrations and by prolonged exposures to much lower concentrations. Under some conditions, paraquat injury was prevented by iron chelation with deferoxamine or by blockade of either NMDA or AMPA/ kainate glutamate receptors. During paraquat exposure, glutathione concentration in the cultures was reduced prior to onset of propidium staining. The observation that the hippocampus has a similar selective regional pattern of vulnerability to paraquat and ischemia suggests that their mechanisms of injury may be related.
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Affiliation(s)
- J J Vornov
- Department of Neurology, Johns Hopkins School of Medicine, Baltimore, Maryland 21287, USA
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49
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Mølck AM, Friis C. The cytotoxic effect of paraquat to isolated renal proximal tubular segments from rabbits. Toxicology 1997; 122:123-32. [PMID: 9274808 DOI: 10.1016/s0300-483x(97)00088-7] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Paraquat (PQ) induces lung, liver and kidney damage. Since PQ mainly is eliminated by the kidney, the kidney damage is of particular importance to the outcome of PQ poisoning. The exact toxic mechanism of PQ is still unclear but it is assumed to involve redox cycling and formation of reactive oxygen species. In this study, further investigations on the toxic mechanism and metabolic effects of PQ were performed using isolated renal proximal tubules from rabbits. Proximal tubules were isolated using a combined iron perfusion and collagenase method. Suspended tubules were incubated for varying periods and concentrations of PQ at 25 or 37 degrees C in Krebs-Ringer phosphate buffer or HCO3-/CO2 buffer. The cytotoxic effect of PQ was evaluated by (1) markers of oxidative stress: status of glutathione (GSH/GSSG) and formation of malondialdehyde (MDA); and (2) markers of tubular metabolism: oxygen consumption (QO2), transport of 14C-p-aminohippuric acid (PAH) and 14C-tetraethylammonium (TEA). Using 0.5 and 5 mM PQ, the GSH/GSSG ratio decreased whereas formation of MDA increased indicating oxidative stress. PQ reduced the accumulation of PAH and TEA, the basal QO2 and the ouabain sensitive QO2 indicating inhibition of the Na/K-ATPase. Nystatin-stimulated QO2 was reduced by PQ, excluding inhibition of Na+ entry as a possible cytotoxic mechanism and suggesting mitochondrial injury. This was confirmed by measuring FCCP-uncoupled QO2. Thus high concentrations of PQ appear to disrupt mitochondrial electron chain transfer resulting in reduction of metabolic functions.
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Affiliation(s)
- A M Mølck
- Department of Pharmacology and Pathobiology, Royal Veterinary and Agricultural University, Frederiksberg C, Denmark.
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50
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Tawara T, Fukushima T, Hojo N, Isobe A, Shiwaku K, Setogawa T, Yamane Y. Effects of paraquat on mitochondrial electron transport system and catecholamine contents in rat brain. Arch Toxicol 1996; 70:585-9. [PMID: 8831909 DOI: 10.1007/s002040050316] [Citation(s) in RCA: 77] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The effects of paraquat on rat brain were studied. Activities of complex I (NADH: ubiquinone oxidoreductase) in mitochondrial electron transport system, lipid peroxidation and the amount of catecholamines in rat brain were measured after acute paraquat exposure. Complex I activities were significantly lower and lipid peroxides were higher in the brains of a paraquat-treated group than in those of a control group. Lipid peroxide in rat serum, however, did not increase after paraquat exposure. A study of the time dependency of paraquat effects disclosed that mitochondrial complex I activities in rat brain as well as those in rat lung and liver gradually decreased prior to the appearance of respiratory dysfunction. As compared to controls, the dopamine in rat striatum was significantly lower in the paraquat-treated group. These results suggest that paraquat after crossing the blood-brain barrier might be reduced to the radical in rat brain, which may damage the brain tissue, especially dopaminergic neurons in striatum. We therefore propose that cerebral damage should be taken into consideration on paraquat exposure. Patients may therefore need to be followed up after exposure to high doses of paraquat.
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Affiliation(s)
- T Tawara
- Department of Environmental Medicine, Shimane Medical University, Izumo, Japan
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