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Han Y, Gao T, Li X, Wāng Y. Didactical approaches and insights into environmental processes and cardiovascular hazards of arsenic contaminants. CHEMOSPHERE 2024; 352:141381. [PMID: 38360414 DOI: 10.1016/j.chemosphere.2024.141381] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 01/16/2024] [Accepted: 02/02/2024] [Indexed: 02/17/2024]
Abstract
Arsenic, as a metalloid, has the ability to move and transform in different environmental media. Its widespread contamination has become a significant environmental problem and public concern. Arsenic can jeopardize multiple organs through various pathways, influenced by environmental bioprocesses. This article provides a comprehensive overview of current research on the cardiovascular hazards of arsenic. A bibliometric analysis revealed that there are 376 papers published in 145 journals, involving 40 countries, 631 institutions, and 2093 authors, all focused on arsenic-related concerns regarding cardiovascular health. China and the U.S. have emerged as the central hubs of collaborative relationships and have the highest number of publications. Hypertension and atherosclerosis are the most extensively studied topics, with redox imbalance, apoptosis, and methylation being the primary mechanistic clues. Cardiovascular damage caused by arsenic includes arrhythmia, cardiac remodeling, vascular leakage, and abnormal angiogenesis. However, the current understanding is still inadequate over cardiovascular impairments, underlying mechanisms, and precautionary methods of arsenic, thus calling an urgent need for further studies to bridge the gap between environmental processes and arsenic hazards.
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Affiliation(s)
- Yapeng Han
- Department of Toxicology, School of Public Health & Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, Anhui Medical University, Hefei 230032, China
| | - Tiantian Gao
- Department of Toxicology, School of Public Health & Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, Anhui Medical University, Hefei 230032, China
| | - Xiaozhi Li
- Department of Toxicology, School of Public Health & Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, Anhui Medical University, Hefei 230032, China
| | - Yán Wāng
- Department of Toxicology, School of Public Health & Key Laboratory of Environmental Toxicology of Anhui Higher Education Institutes, Anhui Medical University, Hefei 230032, China.
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Gowda BR, Prakash N, Santhosh CR, Pavithra BH, Rajashekaraiah R, Sathyanarayana ML, Rao S, Waghe P, Kumar KRA, Shivaprasad GR, Muralidhar Y. Effect of Telmisartan on Arsenic-Induced (Sub-chronic) Perturbations in Redox Homeostasis, Pro-inflammatory Cascade and Aortic Dysfunction in Wistar Rats. Biol Trace Elem Res 2022; 200:1776-1790. [PMID: 34339004 DOI: 10.1007/s12011-021-02804-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Accepted: 06/19/2021] [Indexed: 11/26/2022]
Abstract
An experimental study was conducted in male Wistar rats to explore the antioxidant potential of telmisartan (an AT1 receptor blocker) to overcome arsenic ('As')-induced perturbations in redox homeostasis pro-inflammatory cytokines, prostaglandin-E2 levels and aortic dysfunction in Wistar rats. Wistar rats were randomly divided into four groups of six each. Group-I served as untreated control, while group-II received sodium (meta) arsenite (NaAsO2) (10 mg/kg b.wt. p.o) for a period of 60 days. Experimental rats in group-III received treatment similar to group-II, but in addition received telmisartan (with 1% aqueous solution of Tween 80) @ 10 mg/kg b.wt. (p.o) for a similar duration, while rats in group-IV received telmisartan alone. Arsenic exposure resulted in significant (p < 0.05) elevation in the levels of superoxide anion ([Formula: see text]) radicals (control: 768.20 ± 126.77 vs group-II: 1232.75 ± 97.85 pmol of NBT reduced/min/mg protein). Telmisartan administration showed significant (p < 0.05) reduction in [Formula: see text] generation (815.34 ± 43.41 pmol of NBT reduced/min/mg protein). Sub-chronic exposure to 'As' significantly (p < 0.05) decreased the activities of SOD, CAT, GPx and GR activity and GSH levels in the aorta, thus induced lipid peroxidation (LPO) measured as measured in terms of thiobarbituric acid reactive substances (TBARS) called as malondialdehyde (MDA). However, the administration of telmisartan effectively countered the LPO (24.03 ± 1.18 nmol of MDA/g) on account of restoring the levels of aforesaid antioxidant defense system. Telmisartan administration effectively attenuated the 'As'-induced surge in pro-inflammatory cytokines (viz., IL-1β, IL-6 and TNF-α) levels, as well as countered the activity of cyclooxygenase (COX2) as indicated by a significant (p < 0.05) decrease in PGE2 level in the aorta. In addition to it, there was a significant (p < 0.05) decrease in plasma angiotensin II (Ang-II) levels in experimental rats receiving telmisartan. Quantitative RT-PCR studies revealed that sub-chronic exposure to 'As' upregulated the Nox2 mRNA expression, but there was a 1.2-fold reduction in expression level upon co-administration of telmisartan. Histopathological examination revealed marked recovery from 'As'-induced disruption of tunica adventitia and loss of connective tissue in experimental rats receiving telmisartan. The study concludes that telmisartan can overcome aortic dysfunction induced by sub-chronic exposure to arsenic through drinking water in experimental rats through restoration of redox balance, attenuation of pro-inflammatory cytokines and mediators and downregulation of Nox2 mRNA expression.
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Affiliation(s)
- B Rudresh Gowda
- Department of Veterinary Pharmacology and Toxicology, Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Hebbal, Bengaluru, Karnataka, 560 024, India
| | - N Prakash
- Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Vinobanagar, Shivamogga, Karnataka, 577 204, India.
| | - C R Santhosh
- Department of Veterinary Pharmacology and Toxicology, Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Hebbal, Bengaluru, Karnataka, 560 024, India
| | - B H Pavithra
- Department of Veterinary Pharmacology and Toxicology, Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Hebbal, Bengaluru, Karnataka, 560 024, India
| | - Rashmi Rajashekaraiah
- Department of Veterinary Pharmacology and Toxicology, Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Hebbal, Bengaluru, Karnataka, 560 024, India
| | - M L Sathyanarayana
- Department of Veterinary Pathology, Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Hebbal, Bengaluru, Karnataka, 560 024, India
| | - Suguna Rao
- Department of Veterinary Pathology, Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Hebbal, Bengaluru, Karnataka, 560 024, India
| | - Prashantkumar Waghe
- Department of Veterinary Pharmacology and Toxicology, Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Nandinagar, Bidar, Karnataka, 585 226, India
| | - K R Anjan Kumar
- Department of Veterinary Pathology, Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Hebbal, Bengaluru, Karnataka, 560 024, India
| | - G R Shivaprasad
- Department of Veterinary Pharmacology and Toxicology, Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Hebbal, Bengaluru, Karnataka, 560 024, India
| | - Y Muralidhar
- Department of Veterinary Pharmacology and Toxicology, Veterinary College, Karnataka Veterinary, Animal and Fisheries Sciences University, Hebbal, Bengaluru, Karnataka, 560 024, India
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Zhao Y, Li M, Tian X, Xie J, Liu P, Ying X, Wang M, Yuan J, Gao Y, Tian F, Yan X. Effects of arsenic exposure on lipid metabolism: a systematic review and meta-analysis. Toxicol Mech Methods 2021; 31:188-196. [PMID: 33472496 DOI: 10.1080/15376516.2020.1864537] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Lipid metabolism dysfunction is a risk factor for cardiovascular diseases. Reportedly, arsenic exposure could affect lipid metabolism, but this finding remains controversial. Herein, we updated and reevaluated evidence regarding the relationship between arsenic exposure and lipid metabolism. Electronic and manual searches were performed to determine the effect of arsenic exposure on lipid metabolism from inception up to 30 November 2019. Overall, five studies were included in our meta-analysis. Two reviewers independently extracted information. Standardized mean difference (SMD) and 95% confidence intervals (CI) were used to analyze the combined effects of four indicators related to lipid metabolism (total cholesterol [TC], triglyceride [TG], high-density lipoprotein [HDL], low-density lipoprotein [LDL]). Afterwards, subgroup and sensitivity analyses were performed to explore the source of heterogeneity. Publication bias was tested using funnel plots and Begg's test. In this study, we observed that arsenic exposure can affect lipid metabolism by reducing serum HDL levels and increasing serum LDL levels. Following subgroup analysis, the arsenic concentration appeared to affect lipid metabolism. Funnel plot and Begg's test suggested no asymmetry. In conclusion, we recommend that potential influencing factors, including age, exposure time, and multiple concentration gradients, should be considered to further explore the relationship between arsenic exposure and lipid metabolism.
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Affiliation(s)
- Yannan Zhao
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Meng Li
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Xiaolin Tian
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China.,Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi, China
| | - Jiaxin Xie
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Penghui Liu
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Xiaodong Ying
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Meng Wang
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Jiyu Yuan
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Yi Gao
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Fengjie Tian
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
| | - Xiaoyan Yan
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi, China
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Durappanavar PN, Nadoor P, Waghe P, Pavithra BH, Jayaramu GM. Melatonin Ameliorates Neuropharmacological and Neurobiochemical Alterations Induced by Subchronic Exposure to Arsenic in Wistar Rats. Biol Trace Elem Res 2019; 190:124-139. [PMID: 30306420 DOI: 10.1007/s12011-018-1537-1] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/18/2018] [Accepted: 09/25/2018] [Indexed: 02/07/2023]
Abstract
An experimental study was conducted in Wistar rats to characterize the arsenic ("As")-induced alterations in neurobiochemistry in brain and its impact on neuropharmacological activities with or without the melatonin (MLT) as an antioxidant given exogenously. Male Wistar rats were randomly divided in to four groups of six each. Group I served as untreated control, while group II received As [sodium (meta) arsenite; NaAsO2] at 10 mg/kg bw (p.o.) for a period of 56 days. Experimental rats in group III received treatment similar to group II but in addition received MLT at 10 mg/kg bw (p.o.) from day 32 onwards. Rats in group IV received MLT alone from day 32 onwards similar to group III. Sub-chronic exposure to As (group II) significantly reduced both voluntary locomotor and forced motor activities and melatonin supplementation (group III) showed a significant improvement in motor activities, when subjected to test on day 42 or 56. Rats exposed to As showed a significant increase in anxiety level and a marginal nonsignificant reduction in pain latency. Sub-chronic administration of As induced (group II) significant increase in the levels of thiobarbituric acid reactive substance (TBARS) called malondialdehyde (MDA) in the brain tissue (5.55 ± 0.57 nmol g-1), and their levels were significantly reduced by MLT supplementation (group III 3.96 ± 0.15 nmol g-1). The increase in 3-nitrotyrosine (3-NT) levels in As-exposed rats indicated nitrosative stress due to the formation of peroxynitrite (ONOO-). However, exogenously given MLT significantly reduced the 3-NT formation as well as prostaglandin (PGE2) levels in the brain. Similarly, MLT administration have suppressed the release of pro-inflammatory cytokines (viz., IL-1β, IL-6, and TNF-α) and amyloid-β1-40 (Aβ) deposition in the brain tissues of experimental rats. To conclude, exogenous administration of melatonin can overcome the sub-chronic As-induced oxidative and nitrosative stress in the CNS, suppressed pro-inflammatory cytokines, and restored certain disturbed neuropharmacological activities in Wistar rats.
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Affiliation(s)
- Prasada Ningappa Durappanavar
- Department of Veterinary Pharmacology and Toxicology; Karnataka Veterinary, Animal and Fisheries Sciences University; Veterinary College, Vinobanagar, Shivamogga, Karnataka, 577 204, India
| | - Prakash Nadoor
- Department of Veterinary Pharmacology and Toxicology; Karnataka Veterinary, Animal and Fisheries Sciences University, Veterinary College, Veterinary College, Hebbal, Bengaluru, Karnataka, 560 024, India.
| | - Prashantkumar Waghe
- Department of Veterinary Pharmacology and Toxicology Veterinary College, Nandinagar, Bidar, Karnataka, 585401, India
| | - B H Pavithra
- Department of Veterinary Pharmacology and Toxicology; Karnataka Veterinary, Animal and Fisheries Sciences University, Veterinary College, Veterinary College, Hebbal, Bengaluru, Karnataka, 560 024, India
| | - G M Jayaramu
- Department of Veterinary Pathology, Karnataka Veterinary, Animal and Fisheries Sciences University, Veterinary College, Vinobanagar, Shivamogga, Karnataka, 577 204, India
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Wei M, Guo F, Rui D, Wang H, Feng G, Li S, Song G. Alleviation of Arsenic-Induced Pulmonary Oxidative Damage by GSPE as Shown during In vivo and In vitro Experiments. Biol Trace Elem Res 2018; 183:80-91. [PMID: 28803342 DOI: 10.1007/s12011-017-1111-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/20/2017] [Accepted: 07/27/2017] [Indexed: 12/29/2022]
Abstract
A long-term exposure to arsenic may lead to lung damage due to oxidative stress. In this context, GSPE can play a major role as a strong antioxidant. Our study attempted to reveal the connection between arsenic-induced lung injury and the antagonistic effect of GSPE. For this purpose, BEAS-2B cells and Kunming mice were exposed to different dosages of As2O3 and GSPE. Oxidative stress indicators were detected both in vivo and in vitro. Cell survival rate and morphological changes in the lung tissue (H&E staining) were evaluated as well. It was exhibited that As2O3 increased oxidative stress both in vivo and in vitro and decreased cells viability. In contrast, higher cell survival rate was revealed in the group treated with arsenic plus GSPE after 24 h as compared to that in the arsenic group. GSPE effectively reduced oxidative stress levels, along with increasing antioxidant capacity. In vivo experiments in arsenic-exposed group showed alveolar septum to be significantly thickened with considerable capillary congestion and invasion by inflammatory cells. After the intervention with GSPE, there seemed to be a dramatic reversal of morphology with thinning of the alveolar septum, decrease in capillary congestion, and number of inflammatory cells. This had shown that GSPE can effectively reduce the levels of oxidative stress, induced by arsenic in mice lung tissue. Conversely, antioxidant enzymes or products were increased. The experiment proved that GSPE can protect the lungs from oxidative damage induced by arsenic, and it may also be used as an antagonist against arsenic injuries.
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Affiliation(s)
- Meng Wei
- Shihezi University School of Medicine, Shihezi, Xinjiang, 832000, China
| | - Fangming Guo
- Shihezi University School of Medicine, Shihezi, Xinjiang, 832000, China
| | - Dongsheng Rui
- Shihezi University School of Medicine, Shihezi, Xinjiang, 832000, China
| | - Haixia Wang
- Shihezi University School of Medicine, Shihezi, Xinjiang, 832000, China
| | - Gangling Feng
- Shihezi University School of Medicine, Shihezi, Xinjiang, 832000, China
| | - Shugang Li
- Shihezi University School of Medicine, Shihezi, Xinjiang, 832000, China.
| | - Guanling Song
- Shihezi University School of Medicine, Shihezi, Xinjiang, 832000, China.
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Xu M, Rui D, Yan Y, Xu S, Niu Q, Feng G, Wang Y, Li S, Jing M. Oxidative Damage Induced by Arsenic in Mice or Rats: A Systematic Review and Meta-Analysis. Biol Trace Elem Res 2017; 176:154-175. [PMID: 27498811 DOI: 10.1007/s12011-016-0810-4] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/03/2016] [Accepted: 07/11/2016] [Indexed: 01/25/2023]
Abstract
In this meta-analysis, studies reporting arsenic-induced oxidative damage in mouse models were systematically evaluated to provide a scientific understanding of oxidative stress mechanisms associated with arsenic poisoning. Fifty-eight relevant peer-reviewed publications were identified through exhaustive database searching. Oxidative stress indexes assessed included superoxide dismutase (SOD), catalase (CAT), glutathione (GSH), glutathione peroxidase (GPx), glutathione-s-transferase (GST), glutathione reductase (GR), oxidized glutathione (GSSG), malondialdehyde (MDA), and reactive oxygen species (ROS). Our meta-analysis showed that arsenic exposure generally suppressed measured levels of the antioxidants, SOD, CAT, GSH, GPx, GST, and GR, but increased levels of the oxidants, GSSG, MDA, and ROS. Arsenic valence was important and GR and MDA levels increased to a significantly (P < 0.05) greater extent upon exposure to As3+ than to As5+. Other factors that contributed to a greater overall oxidative effect from arsenic exposure included intervention time, intervention method, dosage, age of animals, and the sample source from which the indexes were estimated. Our meta-analysis effectively summarized a wide range of studies and detected a positive relationship between arsenic exposure and oxidative damage. These data provide a scientific basis for the prevention and treatment of arsenic poisoning.
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Affiliation(s)
- Mengchuan Xu
- School of Medicine, Shihezi University, Shihezi, Xinjiang, 832000, China
| | - Dongsheng Rui
- School of Medicine, Shihezi University, Shihezi, Xinjiang, 832000, China
| | - Yizhong Yan
- School of Medicine, Shihezi University, Shihezi, Xinjiang, 832000, China
| | - Shangzhi Xu
- School of Medicine, Shihezi University, Shihezi, Xinjiang, 832000, China
| | - Qiang Niu
- School of Medicine, Shihezi University, Shihezi, Xinjiang, 832000, China
| | - Gangling Feng
- School of Medicine, Shihezi University, Shihezi, Xinjiang, 832000, China
| | - Yan Wang
- School of Medicine, Shihezi University, Shihezi, Xinjiang, 832000, China
| | - Shugang Li
- School of Medicine, Shihezi University, Shihezi, Xinjiang, 832000, China.
| | - Mingxia Jing
- School of Medicine, Shihezi University, Shihezi, Xinjiang, 832000, China.
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He Y, Sun B, Li S, Sun X, Guo Y, Zhao H, Wang Y, Jiang G, Xing M. Simultaneous analysis 26 mineral element contents from highly consumed cultured chicken overexposed to arsenic trioxide by inductively coupled plasma mass spectrometry. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:21741-21750. [PMID: 27522209 DOI: 10.1007/s11356-016-7318-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Accepted: 07/22/2016] [Indexed: 06/06/2023]
Abstract
This study assessed the impacts of dietary arsenic trioxide (As2O3) on 26 mineral element contents in the liver and kidney of chicken. A total of 100 male Hy-line cocks were randomly divided into 2 groups (50 chickens in each group), including an arsenic-treated group (basic diet supplemented with As2O3 at 30 mg/kg) and a control group (basal diet). The feeding experiment lasted for 90 days and the experimental animals were given free access to feed and water. We determined 26 mineral elements in the liver and kidney by inductively coupled plasma mass spectrometry (ICP-MS). The results showed that nine element levels (Al, Mn, Co, Cu, Zn, Se, Cd, Ba, and Pb) were significantly decreased (P < 0.05) in the liver of chickens exposed to As2O3 compared to the control chickens where three element levels (Ni, As, and Hg) increased significantly (P < 0.05). The results in the kidney showed that nine element levels (Al, K, Ca, Cr, Mn, Ni, Sb, Ba, and Pb) were significantly decreased (P < 0.05) in the chickens exposed to As2O3 compared to the control chickens where four element levels (Mo, As, Cd, and Hg) increased significantly (P < 0.05). These results suggest that supplementation of high levels of arsenic affected trace mineral levels in the liver and kidney of chicken, and the effects vary from organ to organ. The aim of this study is to provide references for further study of heavy metal poisoning by detecting the contents of minerals induced by arsenic in chicken.
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Affiliation(s)
- Ying He
- College of Wildlife Resource, Northeast Forestry University, PRC, 26 Hexing Rd, Xiangfang District, Harbin, 150040, People's Republic of China
| | - Bonan Sun
- Department of Chemical Engineering and Bioengineering, McMaster University, 1280 Main Street West, Hamilton, ON, L8S4L8, Canada
| | - Siwen Li
- College of Wildlife Resource, Northeast Forestry University, PRC, 26 Hexing Rd, Xiangfang District, Harbin, 150040, People's Republic of China
| | - Xiao Sun
- College of Wildlife Resource, Northeast Forestry University, PRC, 26 Hexing Rd, Xiangfang District, Harbin, 150040, People's Republic of China
| | - Ying Guo
- College of Wildlife Resource, Northeast Forestry University, PRC, 26 Hexing Rd, Xiangfang District, Harbin, 150040, People's Republic of China
| | - Hongjing Zhao
- College of Wildlife Resource, Northeast Forestry University, PRC, 26 Hexing Rd, Xiangfang District, Harbin, 150040, People's Republic of China
| | - Yu Wang
- College of Wildlife Resource, Northeast Forestry University, PRC, 26 Hexing Rd, Xiangfang District, Harbin, 150040, People's Republic of China
| | - Guangshun Jiang
- College of Wildlife Resource, Northeast Forestry University, PRC, 26 Hexing Rd, Xiangfang District, Harbin, 150040, People's Republic of China.
| | - Mingwei Xing
- College of Wildlife Resource, Northeast Forestry University, PRC, 26 Hexing Rd, Xiangfang District, Harbin, 150040, People's Republic of China.
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Arsenic causes aortic dysfunction and systemic hypertension in rats: Augmentation of angiotensin II signaling. Chem Biol Interact 2015; 237:104-14. [PMID: 26079204 DOI: 10.1016/j.cbi.2015.06.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 04/28/2015] [Accepted: 06/08/2015] [Indexed: 02/07/2023]
Abstract
The groundwater pollutant arsenic can cause various cardiovascular disorders. Angiotensin II, a potent vasoconstrictor, plays an important role in vascular dysfunction by promoting changes in endothelial function, vascular reactivity, tissue remodeling and oxidative stress. We investigated whether modulation of angiotensin II signaling and redox homeostasis could be a mechanism contributing to arsenic-induced vascular disorder. Rats were exposed to arsenic at 25, 50 and 100ppm of sodium arsenite through drinking water consecutively for 90 days. Blood pressure was recorded weekly. On the 91st day, the rats were sacrificed for blood collection and isolation of thoracic aorta. Angiotensin converting enzyme and angiotensin II levels were assessed in plasma. Aortic reactivity to angiotensin II was assessed in organ-bath system. Western blot of AT1 receptors and G protein (Gαq/11), ELISA of signal transducers of MAP kinase pathway and reactive oxygen species (ROS) generation were assessed in aorta. Arsenic caused concentration-dependent increase in systolic, diastolic and mean arterial blood pressure from the 10th, 8th and 7th week onwards, respectively. Arsenic caused concentration-dependent enhancement of the angiotensin II-induced aortic contractile response. Arsenic also caused concentration-dependent increase in the plasma levels of angiotensin II and angiotensin converting enzyme and the expression of aortic AT1 receptor and Gαq/11 proteins. Arsenic increased aortic protein kinase C activity and the concentrations of protein tyrosine kinase, extracellular signal-regulated kinase-1/2 and vascular endothelial growth factor. Further, arsenic increased aortic mRNA expression of Nox2, Nox4 and p22phox, NADPH oxidase activity and ROS generation. The results suggest that arsenic-mediated enhancement of angiotensin II signaling could be an important mechanism in the arsenic-induced vascular disorder, where ROS could augment the angiotensin II signaling through activation of MAP kinase pathway.
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