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Mitochondrial dysfunction promotes the necroptosis of Purkinje cells in the cerebellum of acrylamide-exposed rats. Food Chem Toxicol 2022; 171:113522. [PMID: 36417989 DOI: 10.1016/j.fct.2022.113522] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 10/27/2022] [Accepted: 11/18/2022] [Indexed: 11/21/2022]
Abstract
Acrylamide (ACR) is a common neurotoxicant that can induce central-peripheral neuropathy in human beings. ACR from occupational setting and foods poses a potential threat to people's health. Purkinje cells are the only efferent source of cerebellum, and their output is responsible for coordinating motor activity. Recent studies have reported that Purkinje cell injury is one of the earliest neurotoxicity at any dose rate of ACR. However, the mechanism underlying ACR-mediated damage to Purkinje cells remains unclear. This research aimed to investigate whether necroptosis is involved in ACR-induced Purkinje cell death and its regulatory mechanism. In this study, rats were treated with ACR (40 mg/kg/every other day) for 6 weeks to establish an animal model of ACR neuropathy. Furthermore, an intervention experiment was achieved by rapamycin (RAPA), which is commonly used to activate mitophagy and maintain mitochondrial homeostasis. The results demonstrated ACR exposure caused necroptosis of Purkinje cells, mitochondrial dysfunction, and inflammatory response. By contrast, RAPA alleviated mitochondrial dysfunction and inhibited activation of necroptosis signaling pathway following ACR. In conclusion, our findings suggest that mitochondrial dysfunction and activation of necroptotic signaling are associated with the loss of Purkinje cells in ACR poisoning, which can be a potential therapeutic target for ACR neurotoxicity.
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Khoramjouy M, Naderi N, Kobarfard F, Heidarli E, Faizi M. An Intensified Acrolein Exposure Can Affect Memory and Cognition in Rat. Neurotox Res 2021; 39:277-291. [PMID: 32876917 DOI: 10.1007/s12640-020-00278-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 08/22/2020] [Accepted: 08/25/2020] [Indexed: 12/13/2022]
Abstract
Acrolein is a clear, colorless liquid and a highly reactive α, β-unsaturated aldehyde. Acrolein, a byproduct and initiator of oxidative stress, has a major role in the pathogenesis of disorders including pulmonary, cardiovascular, atherosclerosis, and neurodegenerative diseases. Environmental or dietary exposure and endogenous production are common sources of acrolein. Widespread exposure to acrolein is a major risk for human health; therefore, we decided to investigate the neurological effects of acrolein. In this study, we used male Sprague-Dawley rats and exposed them orally to acrolein (0.5, 1, 3, and 5 mg/kg/day) for 90 days and investigated the neurobehavioral and electrophysiological disturbances. We also assessed the correlation between neurotoxicity and CSF concentration of acrolein in the rats. The results showed that chronic oral administration of acrolein at 5 mg/kg/day impaired learning and memory in the neurobehavioral tests. In addition, acrolein decreased the release of excitatory neurotransmitters such as glutamate in electrophysiological studies. Our data demonstrated that chronic oral exposure of acrolein at a dose of 5 mg/kg leads to a direct correlation between neurotoxicity and its CSF concentration. In conclusion, exposure to acrolein as a major pollutant in the environment may cause cognitive problems and may have serious neurocognitive effects on humans.
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Affiliation(s)
- Mona Khoramjouy
- Department of Pharmacology and Toxicology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, 2660 Vali-e-Asr Ave., Tehran, 19919-53381, Iran
| | - Nima Naderi
- Department of Pharmacology and Toxicology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, 2660 Vali-e-Asr Ave., Tehran, 19919-53381, Iran
| | - Farzad Kobarfard
- Department of Medicinal Chemistry, School of Pharmacy, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Elmira Heidarli
- Department of Pharmacology and Toxicology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, 2660 Vali-e-Asr Ave., Tehran, 19919-53381, Iran
| | - Mehrdad Faizi
- Department of Pharmacology and Toxicology, School of Pharmacy, Shahid Beheshti University of Medical Sciences, 2660 Vali-e-Asr Ave., Tehran, 19919-53381, Iran.
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Abiko Y, Aoki H, Kumagai Y. Effect of combined exposure to environmental aliphatic electrophiles from plants on Keap1/Nrf2 activation and cytotoxicity in HepG2 cells: A model of an electrophile exposome. Toxicol Appl Pharmacol 2021; 413:115392. [PMID: 33428920 DOI: 10.1016/j.taap.2020.115392] [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: 08/25/2020] [Revised: 12/24/2020] [Accepted: 12/30/2020] [Indexed: 11/25/2022]
Abstract
Electrophiles, ubiquitously found in the environment, modify thiol groups of sensor proteins, leading to activation of redox signaling pathways such as the Kelch-like ECH-associated protein 1 (Keap1)/nuclear factor E2 related factor 2 (Nrf2) pathway. Nrf2 activation by exposure to single electrophiles has been established. However, the effect of exposure to a combination of electrophiles on Nrf2 activation has not been well evaluated. The current study examined whether combined exposure to electrophiles enhances the modification of thiol groups and Keap1/Nrf2 activation in HepG2 cells. Six electrophiles [1,2-naphthoquinone (1,2-NQ), 1,4-NQ, 1,4-benzoquinone, (E)-2-hexenal (hexenal), (E)-2-decenal, and (E)-2-butenal] were tested for S-modification of albumin in vitro and for cytotoxicity to HepG2 cells. Interestingly, a mixture of the electrophiles enhanced S-modification of albumin and cytotoxicity compared with exposure to each electrophile separately. Herein, we focused on 1,2-NQ, 1,4-NQ, and hexenal to clarify the combined effect of electrophiles on Keap1/Nrf2 activation in HepG2 cells. A concentration addition model revealed that 1,2-NQ and/or 1,4-NQ additively enhanced hexenal-mediated S-modification of GSH in vitro, whereas the cytotoxicity of hexenal was synergistically increased by simultaneous exposure of HepG2 cells to the NQs. Furthermore, an NQ cocktail (2.5 μM each) that does not activate Nrf2 enhanced hexenal-mediated Nrf2 activation. These results suggest that combined exposure to electrophiles at low concentrations induces stronger activation of redox signaling compared with exposure to each electrophile alone and worsens their cytotoxicity.
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Affiliation(s)
- Yumi Abiko
- Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan; Doctoral Program in Biomedical Sciences, Graduate School of Comprehensive Human, Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Hanako Aoki
- Doctoral Program in Biomedical Sciences, Graduate School of Comprehensive Human, Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan
| | - Yoshito Kumagai
- Faculty of Medicine, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan; Doctoral Program in Biomedical Sciences, Graduate School of Comprehensive Human, Sciences, University of Tsukuba, Tsukuba, Ibaraki 305-8575, Japan.
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Role of microglial activation and neuroinflammation in neurotoxicity of acrylamide in vivo and in vitro. Arch Toxicol 2019; 93:2007-2019. [PMID: 31073625 DOI: 10.1007/s00204-019-02471-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 05/02/2019] [Indexed: 12/17/2022]
Abstract
Acrylamide, a soft electrophile, is widely used in the industry and laboratories, and also contaminates certain foods. Neurotoxicity and neurodegenerative effects of acrylamide have been reported in humans and experimental animals, although the underlying mechanism remains obscure. Activation of microglia and neuroinflammation has been demonstrated in various neurodegenerative diseases as well as other pathologies of the brain. The present study aimed to investigate the role of microglial activation and neuroinflammation in acrylamide neurotoxicity. Male 10-week-old Wistar rats were exposed to acrylamide by gavage at 0, 0.2, 2, or 20 mg/kg BW, once per day for 5 weeks. The results showed that 5-week exposure to acrylamide induced inflammatory responses in the cerebral cortex, evident by upregulated mRNA and protein expression of pro-inflammatory cytokines IL-1β, IL-6, and IL-18. Acrylamide also induced activation of microglia, indicated by increased expression of microglial markers, CD11b and CD40, and increased CD11b/c-positive microglial area and microglial process length. In vitro studies using BV-2 microglial cells confirmed microglial inflammatory response, as evident by time- (0-36 h; 50 μM) and dose- (0-500 μM; 24 h) dependent increase in mRNA expression of IL-1β and IL-18, as well as the inflammatory marker iNOS. Furthermore, acrylamide-induced upregulation of pro-inflammatory cytokines was mediated through the NLRP3 inflammasome pathway, as evident by increased expression of NLRP3, caspase 1, and ASC in the rat cerebral cortex, and by the inhibitory effects of NLRP3 inflammasome inhibitor on the acrylamide-induced upregulation of NLRP3, caspase 1, IL-1β, and IL-18 in BV-2 microglia.
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Burcham PC. Carbonyl scavengers as pharmacotherapies in degenerative disease: Hydralazine repurposing and challenges in clinical translation. Biochem Pharmacol 2018; 154:397-406. [PMID: 29883705 DOI: 10.1016/j.bcp.2018.06.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Accepted: 06/04/2018] [Indexed: 12/26/2022]
Abstract
During cellular metabolism, spontaneous oxidative damage to unsaturated lipids generates many electrophilic carbonyl compounds that readily attack cell macromolecules, forming adducts that are potential drivers of tissue dysfunction. Since such damage is heightened in many degenerative conditions, researchers have assessed the efficacy of nucleophilic carbonyl-trapping drugs in animal models of such disorders, anticipating that they will protect tissues by intercepting toxic lipid-derived electrophiles (LDEs) within cells. This Commentary explores recent animal evidence for carbonyl scavenger efficacy in two disparate yet significant conditions known to involve LDE production, namely spinal cord injury (SCI) and alcoholic liver disease (ALD). Primary emphasis is placed on studies that utilised hydralazine, a clinically-approved "broad-spectrum" scavenger known to trap multiple LDEs. In addition to reviewing recent studies of hydralazine efficacy in animal SCI and ALD models, the Commentary reviews new insights concerning novel lifespan- and healthspan-extending properties of hydralazine obtained during studies in model invertebrate organisms, since the mechanisms involved seem of likely benefit during the treatment of degenerative disease. Finally, noting that human translation of the histoprotective properties of hydralazine have been limited, the final section of the Commentary will address two obstacles that hamper clinical translation of LDE-trapping therapies while also suggesting potential strategies for overcoming these problems.
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Affiliation(s)
- Philip C Burcham
- Discipline of Pharmacology, School of Biomedical Science, The University of Western Australia, Crawley, WA 6007, Australia.
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Pals JA, Wagner ED, Plewa MJ, Xia M, Attene-Ramos MS. Monohalogenated acetamide-induced cellular stress and genotoxicity are related to electrophilic softness and thiol/thiolate reactivity. J Environ Sci (China) 2017; 58:224-230. [PMID: 28774613 PMCID: PMC6239421 DOI: 10.1016/j.jes.2017.04.027] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 04/25/2017] [Accepted: 04/26/2017] [Indexed: 05/08/2023]
Abstract
Haloacetamides (HAMs) are cytotoxic, genotoxic, and mutagenic byproducts of drinking water disinfection. They are soft electrophilic compounds that form covalent bonds with the free thiol/thiolate in cysteine residues through an SN2 reaction mechanism. Toxicity of the monohalogenated HAMs (iodoacetamide, IAM; bromoacetamide, BAM; or chloroacetamide, CAM) varied depending on the halogen substituent. The aim of this research was to investigate how the halogen atom affects the reactivity and toxicological properties of HAMs, measured as induction of oxidative/electrophilic stress response and genotoxicity. Additionally, we wanted to determine how well in silico estimates of electrophilic softness matched thiol/thiolate reactivity and in vitro toxicological endpoints. Each of the HAMs significantly induced nuclear Rad51 accumulation and ARE signaling activity compared to a negative control. The rank order of effect was IAM>BAM>CAM for Rad51, and BAM≈IAM>CAM for ARE. In general, electrophilic softness and in chemico thiol/thiolate reactivity provided a qualitative indicator of toxicity, as the softer electrophiles IAM and BAM were more thiol/thiolate reactive and were more toxic than CAM.
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Affiliation(s)
- Justin A Pals
- Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Department of Environmental and Occupational Health, Milken Institute School of Public Health, George Washington University, Washington, DC, United States
| | - Elizabeth D Wagner
- Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Safe Global Water Institute, University of Illinois at Urbana-Champaign, Urbana, IL, United States
| | - Michael J Plewa
- Department of Crop Sciences, University of Illinois at Urbana-Champaign, Urbana, IL, United States; Safe Global Water Institute, University of Illinois at Urbana-Champaign, Urbana, IL, United States
| | - Menghang Xia
- National Center for Advancing Translational Sciences, National Institutes of Health (NIH), Department of Health and Human Services (DHHS), Bethesda, MD, United States
| | - Matias S Attene-Ramos
- Department of Environmental and Occupational Health, Milken Institute School of Public Health, George Washington University, Washington, DC, United States.
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Burcham PC. Acrolein and Human Disease: Untangling the Knotty Exposure Scenarios Accompanying Several Diverse Disorders. Chem Res Toxicol 2016; 30:145-161. [DOI: 10.1021/acs.chemrestox.6b00310] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Philip C. Burcham
- Pharmacology, Pharmacy & Anaesthesiology Unit, School of Medicine and Pharmacology, The University of Western Australia, Crawley, Western Australia 6007, Australia
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