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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Abbreviations
- Aβ:
-
Amyloid-beta peptide
- AD:
-
Alzheimer’s disease
- Akt:
-
Protein Kinase B
- AMPA:
-
α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid
- AMPAR:
-
α-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor
- AMPK:
-
AMP-dependent protein kinase
- APP:
-
Amyloid precursor protein
- AQP:
-
Aqua(glycerol)porins
- As:
-
Arsenic
- As(GS)3 :
-
Arsenic triglutathione
- As2O3 :
-
Arsenic trioxide
- AS3MT:
-
Arsenite methyltransferase
- AsIII:
-
Arsenite
- AsV:
-
Arsenate
- BACE-1:
-
β-Secretase
- BBB:
-
Blood–brain barrier
- BHMT:
-
Betaine hydroxy methyltransferase
- Ca:
-
Calcium
- CBS:
-
Cystathionine beta synthase
- Cd:
-
Cadmium
- CNS:
-
Central nervous system
- CoA:
-
Coenzyme A
- COX:
-
Cyclooxygenase
- CTH:
-
Cystathionine-γ-lyase or γ-cystathionase
- Cys:
-
Cysteine
- DMAIII(GS):
-
Dimethylarsinic GSH
- DMAIII:
-
Dimethylarsinous acid
- DMAV:
-
Dimethylarsinic acid
- DMAH:
-
Dimethylarsine
- DMA·:
-
Dimethylarsine radical
- DMAOO·:
-
Dimethylarsine peroxyl radical
- DMAOOH:
-
Dimethylated arsenic peroxide
- EAAT:
-
Excitatory amino acid transporter
- ER:
-
Endoplasmic reticulum
- ERK:
-
Extracellular-signal-regulated kinase
- γ-GCL:
-
Gamma-glutamylcysteine ligase (or synthase γ-GCS)
- G3P:
-
Glyceraldehyde 3-phosphate
- GAPDH:
-
Glyceraldehyde 3-phosphate dehydrogenase
- GLUT:
-
Glucose transporters
- GS:
-
Glutamine synthetase
- GSH:
-
Glutathione
- GSTs:
-
Glutathione-S transferases
- HAT:
-
Histone acetyltransferases
- iAs:
-
Inorganic As
- iAsV-3-P-glycerate:
-
1-Arsenato-3-phospho-d-glycerate
- IFNγ:
-
Interferon-gamma
- IQ:
-
Intelligence quotient
- IL-1β:
-
Interleukin 1-beta
- iNOS:
-
Inducible NOS
- JNK:
-
C-Jun N-terminal kinase
- Keap1:
-
Kelch-like ECH-associated protein 1
- LTP:
-
Long-term potentiation
- MAPK:
-
Mitogen-activated protein kinase
- MAT:
-
Methionine adenosyltransferase
- 5,10-MeTHF:
-
5,10-Methylene tetrahydrofolate
- MeTs:
-
Methyltransferases
- 2-MG:
-
2-Methyl glycine
- MMA(GS)2 :
-
Monomethylarsinic diglutathione
- MMAIII:
-
Momomethylarsonous acid
- MMAV:
-
Monomethylarsonic acid
- MRP:
-
Multidrug resistance protein
- MS:
-
Methionine synthase
- MT:
-
Metallothionenin
- MTF1:
-
Metal-responsive transcription factor-1
- 5-MTHF:
-
5-Methyl tetrahydrofolate
- MTHFR:
-
Methyl tetrahydrofolate reductase
- mTOR:
-
Mechanistic (or mammalian) target of rapamycin
- NaAsO2 :
-
Sodium arsenite
- NADPH:
-
Nicotinamide adenine dinucleotide phosphate
- NF-κB:
-
Nuclear factor kappa-light-chain-enhancer of activated B cells
- NMDA:
-
Glutamate/N-methyl-d-aspartate
- NMDAR:
-
Glutamate/N-methyl-d-aspartate receptor
- NO:
-
Nitric oxide
- NOS:
-
Nitric oxide synthase
- NOX:
-
NADPH oxidase
- NQO1:
-
NADPH dehydrogenase quinone 1
- Nrf2:
-
Nuclear factor (erythroid-derived 2)-like 2
- p62:
-
Autophagic receptor sequestosome-1, p62/SQSTM1
- Pb:
-
Lead
- PD:
-
Parkinson’s disease
- PDH:
-
Pyruvate dehydrogenase
- PGC-1α:
-
Peroxisome proliferator-activated receptor gamma coactivator 1-alpha
- PI3K:
-
Class III phosphatidylinositol 3-kinase
- PNS:
-
Peripheral nervous system
- Pi:
-
Phosphate
- PPi:
-
Diphosphate
- PTGEs:
-
Prostaglandin E synthase
- RAGE:
-
Advanced glycation-end products
- RNS:
-
Reactive nitrogen species
- ROS:
-
Reactive oxygen species
- SAH:
-
s-Adenosylhomocysteine
- SAHH:
-
SAH hydrolase
- SAM:
-
s-Adenosylmethionine
- SOD:
-
Superoxide dismutase
- TCA:
-
Tricarboxylic acid
- TFAM:
-
Mitochondrial transcription factor A
- TNF-α:
-
Tumor necrosis factor alpha
- TR:
-
Trx reductase
- Trx:
-
Thioredoxin
- xCT:
-
Cystine/glutamate exchanger system
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Acknowledgements
This work was supported by the National Institutes of Health Grant P20RR17675 Centers of Biomedical Research Excellence (COBRE), the Research Council, and the Office of Research at the University of Nebraska-Lincoln.
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Garza-Lombó, C., Pappa, A., Panayiotidis, M.I. et al. Arsenic-induced neurotoxicity: a mechanistic appraisal. J Biol Inorg Chem 24, 1305–1316 (2019). https://doi.org/10.1007/s00775-019-01740-8
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DOI: https://doi.org/10.1007/s00775-019-01740-8