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Vázquez Cervantes GI, González Esquivel DF, Ramírez Ortega D, Blanco Ayala T, Ramos Chávez LA, López-López HE, Salazar A, Flores I, Pineda B, Gómez-Manzo S, Pérez de la Cruz V. Mechanisms Associated with Cognitive and Behavioral Impairment Induced by Arsenic Exposure. Cells 2023; 12:2537. [PMID: 37947615 PMCID: PMC10649068 DOI: 10.3390/cells12212537] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 10/25/2023] [Accepted: 10/27/2023] [Indexed: 11/12/2023] Open
Abstract
Arsenic (As) is a metalloid naturally present in the environment, in food, water, soil, and air; however, its chronic exposure, even with low doses, represents a public health concern. For a long time, As was used as a pigment, pesticide, wood preservative, and for medical applications; its industrial use has recently decreased or has been discontinued due to its toxicity. Due to its versatile applications and distribution, there is a wide spectrum of human As exposure sources, mainly contaminated drinking water. The fact that As is present in drinking water implies chronic human exposure to this metalloid; it has become a worldwide health problem, since over 200 million people live where As levels exceed safe ranges. Many health problems have been associated with As chronic exposure including cancer, cardiovascular diseases, gastrointestinal disturbances, and brain dysfunctions. Because As can cross the blood-brain barrier (BBB), the brain represents a target organ where this metalloid can exert its long-term toxic effects. Many mechanisms of As neurotoxicity have been described: oxidative stress, inflammation, DNA damage, and mitochondrial dysfunction; all of them can converge, thus leading to impaired cellular functions, cell death, and in consequence, long-term detrimental effects. Here, we provide a current overview of As toxicity and integrated the global mechanisms involved in cognitive and behavioral impairment induced by As exposure show experimental strategies against its neurotoxicity.
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Affiliation(s)
- Gustavo Ignacio Vázquez Cervantes
- Neurobiochemistry and Behavior Laboratory, National Institute of Neurology and Neurosurgery “Manuel Velasco Suárez”, Mexico City 14269, Mexico; (G.I.V.C.); (D.F.G.E.); (T.B.A.); (H.E.L.-L.)
| | - Dinora Fabiola González Esquivel
- Neurobiochemistry and Behavior Laboratory, National Institute of Neurology and Neurosurgery “Manuel Velasco Suárez”, Mexico City 14269, Mexico; (G.I.V.C.); (D.F.G.E.); (T.B.A.); (H.E.L.-L.)
| | - Daniela Ramírez Ortega
- Neuroimmunology Department, National Institute of Neurology and Neurosurgery “Manuel Velasco Suárez”, Mexico City 14269, Mexico; (D.R.O.); (A.S.); (I.F.); (B.P.)
| | - Tonali Blanco Ayala
- Neurobiochemistry and Behavior Laboratory, National Institute of Neurology and Neurosurgery “Manuel Velasco Suárez”, Mexico City 14269, Mexico; (G.I.V.C.); (D.F.G.E.); (T.B.A.); (H.E.L.-L.)
| | - Lucio Antonio Ramos Chávez
- Departamento de Neuromorfología Funcional, Dirección de Investigaciones en Neurociencias, Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz, Mexico City 14370, Mexico;
| | - Humberto Emanuel López-López
- Neurobiochemistry and Behavior Laboratory, National Institute of Neurology and Neurosurgery “Manuel Velasco Suárez”, Mexico City 14269, Mexico; (G.I.V.C.); (D.F.G.E.); (T.B.A.); (H.E.L.-L.)
| | - Alelí Salazar
- Neuroimmunology Department, National Institute of Neurology and Neurosurgery “Manuel Velasco Suárez”, Mexico City 14269, Mexico; (D.R.O.); (A.S.); (I.F.); (B.P.)
| | - Itamar Flores
- Neuroimmunology Department, National Institute of Neurology and Neurosurgery “Manuel Velasco Suárez”, Mexico City 14269, Mexico; (D.R.O.); (A.S.); (I.F.); (B.P.)
| | - Benjamín Pineda
- Neuroimmunology Department, National Institute of Neurology and Neurosurgery “Manuel Velasco Suárez”, Mexico City 14269, Mexico; (D.R.O.); (A.S.); (I.F.); (B.P.)
| | - Saúl Gómez-Manzo
- Laboratorio de Bioquímica Genética, Instituto Nacional de Pediatría, Secretaría de Salud, México City 04530, Mexico;
| | - Verónica Pérez de la Cruz
- Neurobiochemistry and Behavior Laboratory, National Institute of Neurology and Neurosurgery “Manuel Velasco Suárez”, Mexico City 14269, Mexico; (G.I.V.C.); (D.F.G.E.); (T.B.A.); (H.E.L.-L.)
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Yan N, Jing H, Wang J, Li Z, Xu K, Wang Q, Zheng J, Shi L, Cao X, Duan X. Arsenic Induces Blood‒Brain Barrier Disruption and Regulates T Lymphocyte Subpopulation Differentiation in the Cerebral Cortex and Hippocampus Associated with the Nrf2 Pathway In Vivo. Biol Trace Elem Res 2022:10.1007/s12011-022-03500-3. [PMID: 36435854 DOI: 10.1007/s12011-022-03500-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Accepted: 11/18/2022] [Indexed: 11/28/2022]
Abstract
Increasing evidence has confirmed that the nervous system shows innate and adaptive immunity, which also participates in nerve damage. This study aimed to explore the neuroimmune imbalance induced by arsenic and its possible mechanism. Mice were exposed to NaAsO2 (0, 5, 10, 25, and 50 mg/L) for 1 month by drinking water. Y-maze and Morris water maze tests revealed that arsenic impaired learning and memory. The optical density of Evans blue showed a marked dose-dependent increase in the brain, and the mRNA and protein levels of the BBB tight junctions (TJs), occludin at 25 and 50 mg/L arsenic, and claudin-5 at 50 mg/L arsenic, were markedly decreased in the cerebral cortex. Arsenic downregulated occludin and claudin-5 mRNA expression at 50 mg/L and protein expression at 25 and 50 mg/L in the hippocampus. Immunohistochemical staining showed that 50 mg/L arsenic increased corticocerebral and hippocampal CD3+ T, CD4+ T, and CD8+ T cells; CD4 and CD8 proteins were increased with 25 and 50 mg/L arsenic. Arsenic decreased the corticocerebral and hippocampal Th1, Th17, and regulatory Treg transcription factors T-bet, Rorγt, and Foxp3 and the cytokine IFN-γ, IL-17, and TGF-β mRNA levels and increased the Th2 transcription factor GATA3 and cytokine IL-4 mRNA levels. Moreover, arsenic enhanced the expression of nuclear factor E2-related factor (Nrf2) and its downstream enzymes heme oxygenase-1 (HO-1) and glutathione-S-transferase (GST). In conclusion, these results demonstrate that arsenic exposure induces BBB dysfunction and T lymphocyte infiltration and affects CD4+ T lymphocyte differentiation, which may be associated with Nrf2 activation.
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Affiliation(s)
- Nan Yan
- Department of Medical Applied Technology, Shenyang Medical College, Liaoning, Shenyang, China
| | - Hui Jing
- Department of Toxicology, School of Public Health, Shenyang Medical College, Liaoning, Shenyang, China
| | - Jie Wang
- Department of Scientific Research, Shenyang Medical College, Liaoning, Shenyang, China
| | - Zhou Li
- Department of Toxicology, School of Public Health, Shenyang Medical College, Liaoning, Shenyang, China
| | - Kangjie Xu
- Department of Toxicology, School of Public Health, Shenyang Medical College, Liaoning, Shenyang, China
| | - Qian Wang
- Department of Toxicology, School of Public Health, Shenyang Medical College, Liaoning, Shenyang, China
| | - Jingwen Zheng
- Department of Toxicology, School of Public Health, Shenyang Medical College, Liaoning, Shenyang, China
| | - Lei Shi
- Affiliated Health School, Shenyang Medical College, Liaoning, Shenyang, China
| | - Xiankui Cao
- Department of General Surgery, Liaoning Province Cancer Hospital and Institute (Cancer Hospital of China Medical University), Liaoning, Shenyang, China.
| | - Xiaoxu Duan
- Department of Toxicology, School of Public Health, Shenyang Medical College, Liaoning, Shenyang, China.
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Carmona A, Roudeau S, Ortega R. Molecular Mechanisms of Environmental Metal Neurotoxicity: A Focus on the Interactions of Metals with Synapse Structure and Function. TOXICS 2021; 9:toxics9090198. [PMID: 34564349 PMCID: PMC8471991 DOI: 10.3390/toxics9090198] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/25/2021] [Accepted: 08/25/2021] [Indexed: 02/07/2023]
Abstract
Environmental exposure to neurotoxic metals and metalloids such as arsenic, cadmium, lead, mercury, or manganese is a global health concern affecting millions of people worldwide. Depending on the period of exposure over a lifetime, environmental metals can alter neurodevelopment, neurobehavior, and cognition and cause neurodegeneration. There is increasing evidence linking environmental exposure to metal contaminants to the etiology of neurological diseases in early life (e.g., autism spectrum disorder) or late life (e.g., Alzheimer’s disease). The known main molecular mechanisms of metal-induced toxicity in cells are the generation of reactive oxygen species, the interaction with sulfhydryl chemical groups in proteins (e.g., cysteine), and the competition of toxic metals with binding sites of essential metals (e.g., Fe, Cu, Zn). In neurons, these molecular interactions can alter the functions of neurotransmitter receptors, the cytoskeleton and scaffolding synaptic proteins, thereby disrupting synaptic structure and function. Loss of synaptic connectivity may precede more drastic alterations such as neurodegeneration. In this article, we will review the molecular mechanisms of metal-induced synaptic neurotoxicity.
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Azubuike-Osu SO, Famurewa AC, David JC, Abi I, Ogbu PN, Oparaji CK, Nwaeze KG, Akunna GG. Virgin Coconut Oil Resists Arsenic-Induced Cerebral Neurotoxicity and Cholesterol Imbalance via Suppression of Oxidative Stress, Adenosine Deaminase and Acetylcholinesterase Activities in Rats. Nat Prod Commun 2021. [DOI: 10.1177/1934578x211016962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Arsenic (As) is a classic neurotoxicant; its pathogenesis is associated with oxidative stress and oxidative stress-mediated cholinergic deficits. This study explored antioxidant activity of virgin coconut oil (VCO) against sodium arsenite-induced oxidative stress-mediated cerebral neurotoxicity in rats. Eighteen rats were divided into 3 groups- Normal control, As control and VCO + As. The VCO (5 mL/kg) was given once daily by oral gavage from day 1 to day 21, while As (10 mg/kg) was given once daily by oral gavage from day 15 to day 21. Cerebral superoxide dismutase (SOD), catalase (CAT), glutathione peroxidase (GPx), malondialdehyde (MDA), adenosine deaminase (ADA) and acetylcholinesterase (AchE) activities were analysed. Nitric oxide (NO), lipid profile, phospholipid (PL), and reduced glutathione (GSH) were also evaluated in cerebral homogenate. The cerebrum was sectioned for histological analysis. Administration of As induced significant depressions in antioxidant enzymes, GSH, PL, and HDL-c compared to normal control. Levels of MDA, NO, total cholesterol and activities of ADA, AchE in the cerebrum were markedly increased by As compared to normal rats. Lipid profile indices and PL were prominently altered by As. Histopathological study supported the biochemical findings through extensive cerebral damage. In contrast, oral supplementation of VCO prior to and along with As treatment significantly attenuated the As-induced biochemical alterations and restored near-normal histology. VCO attenuates cerebral neurotoxicity by strengthening endogenous antioxidant defence and cholinergic function via counteracting free-radical-mediated arsenic toxicity.
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Affiliation(s)
- Sharon O. Azubuike-Osu
- Department of Physiology, Faculty of Basic Medical Sciences, College of Medicine, Alex Ekwueme Federal University, Ndufu-Alike, Ikwo, Nigeria
| | - Ademola C. Famurewa
- Department of Medical Biochemistry, Faculty of Basic Medical Sciences, College of Medicine, Alex-Ekwueme Federal University, Ndufu-Alike, Ikwo, Nigeria
| | - Japheth C. David
- Department of Physiology, Faculty of Basic Medical Sciences, College of Medicine, Alex Ekwueme Federal University, Ndufu-Alike, Ikwo, Nigeria
| | - Innocent Abi
- Department of Physiology, Benue State University, Makurdi, Nigeria
| | - Patience N. Ogbu
- Department of Medical Biochemistry, Faculty of Basic Medical Sciences, College of Medicine, Alex-Ekwueme Federal University, Ndufu-Alike, Ikwo, Nigeria
| | - Chiedozie K. Oparaji
- Department of Physiology, Faculty of Basic Medical Sciences, College of Medicine, Alex Ekwueme Federal University, Ndufu-Alike, Ikwo, Nigeria
| | - Konyefom G. Nwaeze
- Department of Physiology, Faculty of Basic Medical Sciences, College of Medicine, Alex Ekwueme Federal University, Ndufu-Alike, Ikwo, Nigeria
| | - Godson G. Akunna
- Department of Anatomy, College of Medicine and Health Sciences, Bowen University, Nigeria
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Dominguez S, Lencinas I, Bartos M, Gallegos C, Bras C, Mónaco N, Minetti A, Gumilar F. Neurobehavioral and neurochemical effects in rats offspring co-exposed to arsenic and fluoride during development. Neurotoxicology 2021; 84:30-40. [PMID: 33609566 DOI: 10.1016/j.neuro.2021.02.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2020] [Revised: 02/11/2021] [Accepted: 02/14/2021] [Indexed: 11/29/2022]
Abstract
Arsenic (iAs) and fluoride (F) are ubiquitous in the environment. All over the world, in many countries, thousands of people are suffering from the toxic effects of arsenicals ad fluorides. These two elements are recognized worldwide as the most serious inorganic contaminants in drinking water. When two different types of toxicants are simultaneously going inside the human body they may function independently or can act as synergistic or antagonistic to one another. Although there have been reports in literature of individual toxicity of iAs and F, however, not much is known about the effects following the combined exposure to the toxicants above mentioned. In this work, we investigated the effect of the co-exposure to low levels of iAs/F through drinking water during pregnancy and lactation on central nervous system functionality in the exposed rats offspring. Wistar rats were exposed to one of these solutions: 0.05 mg/L iAs and 5 mg/L F (Concentration A) or 0.10 mg/L iAs and 10 mg/L F (Concentration B) from gestational day 0 up to post-gestational day 21. Sensory-motor reflexes a Functional Observational Battery and the locomotor activity in an open field were assessed in offspring. Additionally, the transaminases, acethylcholinesterase and catalase levels in the striatum were determined to elucidate the possible molecular mechanisms involved in locomotor and neurobehavioral disorders. The results showed that iAs/F exposition during development produces a delay reach the maturity of sensorimotor reflexes. A decrease in the nociceptive reflex response, and increase in the locomotor activity in adult rats offspring were observed. The increase in oxidative stress, the inhibition of transaminases enzymes and the inhibition of AChE in the striatum may partially regulate all the neurobehavioral disorders observed.
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Affiliation(s)
- Sergio Dominguez
- Laboratorio de Toxicología, Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR), Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Depto. de Biología, Bioquímica y Farmacia, San Juan 670, 8000, Bahía Blanca, Argentina
| | - Ileana Lencinas
- Laboratorio de Toxicología, Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR), Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Depto. de Biología, Bioquímica y Farmacia, San Juan 670, 8000, Bahía Blanca, Argentina
| | - Mariana Bartos
- Laboratorio de Toxicología, Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR), Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Depto. de Biología, Bioquímica y Farmacia, San Juan 670, 8000, Bahía Blanca, Argentina
| | - Cristina Gallegos
- Laboratorio de Toxicología, Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR), Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Depto. de Biología, Bioquímica y Farmacia, San Juan 670, 8000, Bahía Blanca, Argentina
| | - Cristina Bras
- Laboratorio de Toxicología, Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR), Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Depto. de Biología, Bioquímica y Farmacia, San Juan 670, 8000, Bahía Blanca, Argentina
| | - Nina Mónaco
- Laboratorio de Toxicología, Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR), Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Depto. de Biología, Bioquímica y Farmacia, San Juan 670, 8000, Bahía Blanca, Argentina
| | - Alejandra Minetti
- Laboratorio de Toxicología, Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR), Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Depto. de Biología, Bioquímica y Farmacia, San Juan 670, 8000, Bahía Blanca, Argentina
| | - Fernanda Gumilar
- Laboratorio de Toxicología, Instituto de Investigaciones Biológicas y Biomédicas del Sur (INBIOSUR), Departamento de Biología, Bioquímica y Farmacia, Universidad Nacional del Sur, Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Depto. de Biología, Bioquímica y Farmacia, San Juan 670, 8000, Bahía Blanca, Argentina.
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Garza-Lombó C, Pappa A, Panayiotidis MI, Gonsebatt ME, Franco R. Arsenic-induced neurotoxicity: a mechanistic appraisal. J Biol Inorg Chem 2019; 24:1305-1316. [PMID: 31748979 DOI: 10.1007/s00775-019-01740-8] [Citation(s) in RCA: 70] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2019] [Accepted: 10/24/2019] [Indexed: 12/19/2022]
Abstract
Arsenic is a metalloid found in groundwater as a byproduct of soil/rock erosion and industrial and agricultural processes. This xenobiotic elicits its toxicity through different mechanisms, and it has been identified as a toxicant that affects virtually every organ or tissue in the body. In the central nervous system, exposure to arsenic can induce cognitive dysfunction. Furthermore, iAs has been linked to several neurological disorders, including neurodevelopmental alterations, and is considered a risk factor for neurodegenerative disorders. However, the exact mechanisms involved are still unclear. In this review, we aim to appraise the neurotoxic effects of arsenic and the molecular mechanisms involved. First, we discuss the epidemiological studies reporting on the effects of arsenic in intellectual and cognitive function during development as well as studies showing the correlation between arsenic exposure and altered cognition and mental health in adults. The neurotoxic effects of arsenic and the potential mechanisms associated with neurodegeneration are also reviewed including data from experimental models supporting epidemiological evidence of arsenic as a neurotoxicant. Next, we focused on recent literature regarding arsenic metabolism and the molecular mechanisms that begin to explain how arsenic damages the central nervous system including, oxidative stress, energy failure and mitochondrial dysfunction, epigenetics, alterations in neurotransmitter homeostasis and synaptic transmission, cell death pathways, and inflammation. Outlining the specific mechanisms by which arsenic alters the cell function is key to understand the neurotoxic effects that convey cognitive dysfunction, neurodevelopmental alterations, and neurodegenerative disorders.
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Affiliation(s)
- Carla Garza-Lombó
- Redox Biology Center, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA.,School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE, 68583, USA.,Departamento de Medicina Genómica y Toxicología Ambiental, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, 04510, Mexico City, Mexico
| | - Aglaia Pappa
- Department of Molecular Biology and Genetics, Democritus University of Thrace, Alexandroupolis, Greece
| | | | - María E Gonsebatt
- Departamento de Medicina Genómica y Toxicología Ambiental, Instituto de Investigaciones Biomédicas, Universidad Nacional Autónoma de México, 04510, Mexico City, Mexico
| | - Rodrigo Franco
- Redox Biology Center, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA. .,School of Veterinary Medicine and Biomedical Sciences, University of Nebraska-Lincoln, Lincoln, NE, 68583, USA.
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