scholarly journals Variation in Arsenic metabolism in schistosomiasis associated bladder pathology in a rural community, Eggua, Ogun State, Nigeria

2021 ◽  
Vol 25 (9) ◽  
pp. 1645-1652
Author(s):  
A.T. Adeboye ◽  
H.O. Awobode ◽  
A.S. Adebayo ◽  
J.R. Djouaka ◽  
R.D. Isokpehi ◽  
...  
Keyword(s):  
Arsenic Concentration ◽  
Arsenic Exposure ◽  
Inorganic Arsenic ◽  
Urogenital Schistosomiasis ◽  
Arsenic Metabolism ◽  
Ogun State ◽  
Specific Pcr ◽  
Urinary Arsenic ◽  
Increased Risk ◽  
Bladder Pathology

Exposure to toxic inorganic Arsenic (iAs) in areas endemic for urogenital schistosomiasis may confer increased risk for bladder cancer. The severity of the adverse effects of iAs however depends on its metabolism, which is highly variable among individuals. Genetic polymorphism in Arsenic (+3) Methyl Transferase enzyme, accounts significantly for these variations. To investigate the relationship of AS3MT gene polymorphisms and Arsenic metabolism to schistosomiasis and/or associated bladder pathology, 119 individualsfrom Eggua in southwest Nigeria were recruited for this study. Screening for schistosomiasis and bladder pathology was done by microscopy and ultrasonography respectively. Wagtech Digital Arsenator was used to assess total urinary arsenic concentrations and thus determine the level of arsenic exposure. The single nucleotide polymorphism AS3MT/Met287Thr T>C (rs11191439) was genotyped using Alelle-Specific PCR. Of the participants who tested positive for schistosomiasis, 33.3% exhibited bladder pathology. Total urinary arsenic concentration in 80% of the participants was above the WHO limit of 0.05mg/L. The Met287Thr allelic distribution conformed to the Hardy-Weinberg equilibrium (X2= 0.161, P> 0.05). Observed allelic frequencies were 0.96 and 0.04 for wild-type T and mutant C alleles respectively. There was no significant relationship between AS3MT SNP, arsenic concentrations and schistosomiasis associated bladder pathology. In conclusion, the community is highly exposed to arsenic, although with a possible genetic advantage of increased AS3MT catalytic activity. However, we see the need for urgent intervention as inter-individual differences in arsenic metabolism may influence the bladder pathology status of individuals in the community. And although urogenital schistosomiasis is waning in Eggua, it is not known what synergy the infection and high arsenic exposure may wield on bladder pathology.

Effects of low-level arsenic exposure on urinary N-acetyl-β-D-glucosaminidase activity

2011 ◽  
Vol 30 (12) ◽  
pp. 1885-1891 ◽  
Author(s):  
S-Y Eom ◽  
Y-C Lee ◽  
D-H Yim ◽  
C-H Lee ◽  
Y-D Kim ◽  
...  
Keyword(s):  
Arsenic Concentration ◽  
Arsenic Exposure ◽  
Inorganic Arsenic ◽  
Tubular Damage ◽  
Seafood Consumption ◽  
Arsenic Level ◽  
Urine Sampling ◽  
Low Level ◽  
Urinary Arsenic ◽  
Renal Tubular

This study was aimed to evaluate whether renal tubular function is impaired by exposure to relatively low concentrations of arsenic. Mean urinary arsenic concentrations and N-acetyl-β-d-glucosaminidase (NAG) activities were compared among 365 and 502 Korean men and women, respectively, in relation to gender, smoking, alcohol consumption, and recent seafood consumption. The study subjects were divided into 4 groups according to urinary NAG activity and seafood consumption prior to urine sampling, and the correlation between arsenic concentration and urinary NAG activity was tested for each group. The mean urinary arsenic level was higher in women, non-smokers, and non-drinkers in comparison to men, smokers, and drinkers, respectively. Individuals who consumed seafood within 3 days prior to urine sampling showed a higher mean urinary arsenic level than those who did not. The correlation between urinary arsenic concentration and NAG activity in urine was significant only in subjects who did not consume seafood within 3 days prior to urine sampling and whose urinary NAG activity was 7.44 U/g creatinine (75th percentile) or higher. The urinary arsenic concentration was a significant determinant of urinary NAG activity in subjects with NAG activity higher than 7.44 U/g creatinine and especially in those who had not consumed seafood recently. These facts suggest that a relatively low-level exposure to inorganic arsenic produces renal tubular damage in humans.

scholarly journals Determinants of arsenic methylation efficiency and urinary arsenic level in pregnant women in Bangladesh

2019 ◽  
Vol 18 (1) ◽  
Author(s):  
Shangzhi Gao ◽  
Pi-I Lin ◽  
Golam Mostofa ◽  
Quazi Quamruzzaman ◽  
Mahmudur Rahman ◽  
...  
Keyword(s):  
Pregnant Women ◽  
Energy Intake ◽  
Protein Intake ◽  
Arsenic Concentration ◽  
Arsenic Species ◽  
Exposure Level ◽  
Arsenic Level ◽  
Arsenic Metabolism ◽  
Arsenic Methylation ◽  
Urinary Arsenic

Abstract Background Prenatal inorganic arsenic (iAs) exposure is associated with pregnancy outcomes. Maternal capabilities of arsenic biotransformation and elimination may influence the susceptibility of arsenic toxicity. Therefore, we examined the determinants of arsenic metabolism of pregnant women in Bangladesh who are exposed to high levels of arsenic. Methods In a prospective birth cohort, we followed 1613 pregnant women in Bangladesh and collected urine samples at two prenatal visits: one at 4–16 weeks, and the second at 21–37 weeks of pregnancy. We measured major arsenic species in urine, including iAs (iAs%) and methylated forms. The proportions of each species over the sum of all arsenic species were used as biomarkers of arsenic methylation efficiency. We examined the difference in arsenic methylation using a paired t-test between first and second visits. Using linear regression, we examined determinants of arsenic metabolism, including age, BMI at enrollment, education, financial provider income, arsenic exposure level, and dietary folate and protein intake, adjusted for daily energy intake. Results Comparing visit 2 to visit 1, iAs% decreased 1.1% (p <  0.01), and creatinine-adjusted urinary arsenic level (U-As) increased 21% (95% CI: 15, 26%; p <  0.01). Drinking water arsenic concentration was positively associated with iAs% at both visits. When restricted to participants with higher adjusted urinary arsenic levels (adjusted U-As > 50 μg/g-creatinine) gestational age at measurement was strongly associated with DMA% (β = 0.38, p <  0.01) only at visit 1. Additionally, DMA% was negatively associated with daily protein intake (β = − 0.02, p <  0.01) at visit 1, adjusting for total energy intake and other covariates. Conclusions Our findings indicate that arsenic metabolism and adjusted U-As level increase during pregnancy. We have identified determinants of arsenic methylation efficiency at visit 1.

scholarly journals Arsenic metabolism and urothelial cancer risk: a systematic review and meta-analysis

2019 ◽  
Vol 29 (Supplement_4) ◽  
Author(s):  
G Di Martino ◽  
P Di Giovanni ◽  
P Scampoli ◽  
F Meo ◽  
F Cedrone ◽  
...  
Keyword(s):  
Systematic Review ◽  
Risk Assessment ◽  
Cancer Risk ◽  
Urothelial Cancer ◽  
Meta Analysis ◽  
Arsenic Exposure ◽  
World Health ◽  
Arsenic Toxicity ◽  
Arsenic Metabolism ◽  
Increased Risk

Abstract Background Arsenic is a toxic metalloid element frequently found in the environment. Chronic arsenic exposure is a critical public health issue in many countries since the identification of arsenic and its compounds as human carcinogens by the World Health Organization. After absorption, inorganic arsenic (iAs) is mainly methylated into monomethylated and dimethylated compounds (MMA, DMA), which are then excreted through the kidney together with unmethylated iAs. Whether the methylation process is to detoxify or potentiate arsenic toxicity, however, remains an ongoing debate. The purpose of this systematic review was to conduct a comprehensive meta-analysis to estimate the association between arsenic exposure and urothelial cancer. Methods 10 observational studies met the inclusion criteria and were included in the systematic review. IAs%, MMA% and DMA% were extracted from each paper. Weighted Mean Differences with 95% confidence intervals were defined according to Cases minus Controls. Pooled risk estimates from individual studies were assessed using random effects models. Meta-regression analysis was performed to estimate the extent of urothelial cancer risk as a function of iAs%, MMA% and DMA%. Results Results showed as patients with urothelial cancer presented higher level of urinary iAs% (WMD 2.70, 95%CI 0.64-4.76), MMA% (WMD 2.81, 95%CI 1.43-4.20) and DMA% (WMD-3.44, 95%CI-6.57–0.30). Conclusions These findings suggest that higher level of iAs% and MMA% and lower level of DMA% were associated with an increased risk of urothelial cancer. Additional population based studies are needed to understand the role of arsenic in cancer development. Understanding the meaning of arsenic metabolism could improve the risk assessment of arsenic toxicity and provide a potential tool for disease prediction and prevention. Key messages Higher level of iAs%, MMA% and DMA% were associated with an increased risk of urothelial cancer. Understanding the meaning of arsenic metabolism could improve the risk assessment of arsenic toxicity.

scholarly journals Mendelian randomization of inorganic arsenic metabolism as a risk factor for hypertension- and diabetes-related traits among adults in the Hispanic Community Health Study/Study of Latinos (HCHS/SOL) cohort

2019 ◽  
Vol 48 (3) ◽  
pp. 876-886 ◽  
Author(s):  
Molly Scannell Bryan ◽  
Tamar Sofer ◽  
Yasmin Mossavar-Rahmani ◽  
Bharat Thyagarajan ◽  
Donglin Zeng ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Arsenic Exposure ◽  
Inorganic Arsenic ◽  
Health Study ◽  
Arsenic Metabolism ◽  
Percentage Point Increase ◽  
Hispanic Community ◽  
Point Increase ◽  
Rice Consumption ◽  
Never Smokers

Abstract Background Hypertension and diabetes have been associated with inefficient arsenic metabolism, primarily through studies undertaken in populations exposed through drinking water. Recently, rice has been recognized as a source of arsenic exposure, but it remains unclear whether populations with high rice consumption but no known water exposure are at risk for the health problems associated with inefficient arsenic metabolism. Methods The relationships between arsenic metabolism efficiency (% inorganic arsenic, % monomethylarsenate and % dimethylarsinate in urine) and three hypertension- and seven diabetes-related traits were estimated among 12 609 participants of the Hispanic Community Health Study/Study of Latinos (HCHS/SOL). A two-sample Mendelian randomization approach incorporated genotype-arsenic metabolism relationships from literature, and genotype-trait relationships from HCHS/SOL, with a mixed-effect linear model. Analyses were stratified by rice consumption and smoking. Results Among never smokers with high rice consumption, each percentage point increase in was associated with increases of 1.96 mmHg systolic blood pressure (P = 0.034) and 1.85 mmHg inorganic arsenic diastolic blood pressure (P = 0.003). Monomethylarsenate was associated with increased systolic (1.64 mmHg/percentage point increase; P = 0.021) and diastolic (1.33 mmHg/percentage point increase; P = 0.005) blood pressure. Dimethylarsinate, a marker of efficient metabolism, was associated with lower systolic (−0.92 mmHg/percentage point increase; P = 0.025) and diastolic (-0.79 mmHg/percentage point increase; P = 0.004) blood pressure. Among low rice consumers and ever smokers, the results were consistent with no association. Evidence for a relationship with diabetes was equivocal. Conclusions Less efficient arsenic metabolism was associated with increased blood pressure among never smokers with high rice consumption, suggesting that arsenic exposure through rice may contribute to high blood pressure in the Hispanic/Latino community.

Arsenic is not stored as arsenite - phytochelatin complexes in the seaweeds Fucus spiralis and Hizikia fusiforme

2011 ◽  
Vol 8 (1) ◽  
pp. 30 ◽  
Author(s):  
B. Alan Wood ◽  
Shinichi Miyashita ◽  
Toshikazu Kaise ◽  
Andrea Raab ◽  
Andrew A. Meharg ◽  
...  
Keyword(s):  
Arsenic Concentration ◽  
Arsenic Exposure ◽  
Toxic Metal ◽  
Inorganic Arsenic ◽  
Terrestrial Plants ◽  
Generic Structure ◽  
Edible Seaweed ◽  
Hizikia Fusiforme ◽  
Toxic Metalloid ◽  
Fucus Spiralis

Environmental context Seaweeds hyperaccumulate the toxic metalloid arsenic, but seemingly achieve detoxification by transformation to arsenosugars. The edible seaweed hijiki is a notable exception because it contains high levels of toxic arsenate and arsenite. Terrestrial plants detoxify arsenic by forming arsenite–phytochelatin complexes. The hypothesis that seaweeds also synthesise phytochelatins to bind arsenite as a means of detoxification before arsenosugar synthesis is tested in this investigation. Abstract Phytochelatins (PCs), generic structure [γ-Glu-Cys]n-Gly, are peptides synthesised by terrestrial plants to bind toxic metal(loid)s such as cadmium and arsenic. Seaweeds are arsenic hyperaccumulators, seemingly achieving detoxification via arsenosugar biosynthesis. Whether seaweeds synthesise PCs to aid detoxification during arsenic exposure is unknown. Hizikia fusiforme (hijiki) and Fucus spiralis were used as model seaweeds: the former is known for its large inorganic arsenic concentration, whereas the latter contains mainly arsenosugars. F. spiralis was exposed to 0, 1 and 10 mg L–1 arsenate solutions for 24 h, whereas hijiki was analysed fresh. All samples contained AsIII, glutathione and reduced PC2, identified using HPLC-ICP-MS/ES-MS. Although hijiki contained no AsIII–PC complexes, arsenate exposed F. spiralis generated traces of numerous arsenic compounds that might be AsIII–GS or AsIII–PC2 complexes. AsIII–PC complexes seem not to be a principal storage form for long-term arsenic storage within seaweeds. However, 40 times higher glutathione concentrations were found in hijiki than F. spiralis, which may explain how hijiki deals with its high inorganic arsenic burden.

Significantly increased risk of carotid atherosclerosis with arsenic exposure and polymorphisms in arsenic metabolism genes

2011 ◽  
Vol 111 (6) ◽  
pp. 804-810 ◽  
Author(s):  
Yi-Chen Hsieh ◽  
Li-Ming Lien ◽  
Wen-Ting Chung ◽  
Fang-I Hsieh ◽  
Pei-Fan Hsieh ◽  
...  
Keyword(s):  
Carotid Atherosclerosis ◽  
Arsenic Exposure ◽  
Arsenic Metabolism ◽  
Increased Risk

Abstract P064: Inverse Associations Between Inorganic Arsenic and Obesity: Findings From the National Health and Nutrition Examination Survey

Circulation ◽  
2016 ◽  
Vol 133 (suppl_1) ◽  
Author(s):  
Catherine Bulka ◽  
Sithembile Mabila ◽  
Mary Turyk ◽  
Maria Argos
Keyword(s):  
Waist Circumference ◽  
National Health ◽  
Arsenic Concentration ◽  
Arsenic Exposure ◽  
Inorganic Arsenic ◽  
The United States ◽  
Serum Folate ◽  
Hydration Status ◽  
Nutrition Examination Survey ◽  
Health And Nutrition

Introduction: Arsenic is ubiquitous in the environment as an element of the earth’s crust. Human exposure predominantly occurs through ingestion of contaminated drinking water and arsenic-rich foods such as seafood and rice. Chronic exposure to inorganic arsenic has been associated with certain cancers, and more recently with cardiovascular disease and diabetes that are common among the obese. However, little is known about the specific relationship between inorganic arsenic exposure and obesity. Hypothesis: We assessed the hypothesis that inorganic arsenic exposure was correlated with obesity in the general population of the United States. Methods: We analyzed a representative sample of 4,105 adults from the U.S. population using data from the 2007-2010 National Health and Nutrition Examination Survey (NHANES). Arsenobetaine and arsenocholine concentrations, which are forms of organic arsenic, were subtracted from total urinary arsenic concentrations to estimate the amount of inorganic arsenic in urine as a biomarker of exposure. These values were standardized by urinary creatinine to control for hydration status. Obesity was assessed using measured body mass index (BMI) in kg/m 2 and waist circumference in cm. Crude and adjusted survey-weighted linear regression models were performed. Results: Creatinine-adjusted urinary inorganic arsenic concentrations were inversely associated with log-transformed BMI (p for trend = 0.0003) and log-transformed waist circumference (p for trend = 0.0001). The highest quintile of inorganic arsenic concentration (>10.4 to 483.3 μg/L) was associated with a 5% (95% CI: 3 to 8%) lower BMI and a 4% (95% CI: 2 to 6%) smaller waist circumference compared to the lowest quintile (0 to 2.3 μg/L). Adjustments for age, gender, race, thyroid problems, diabetes, smoking status, seafood consumption, rice consumption, red blood cell folate, serum folate, socioeconomic status, and survey cycle did not appreciably alter these results. There was no evidence of effect modification between urinary inorganic arsenic concentrations and covariates on obesity. Conclusions: While inorganic arsenic exposure has generally been positively associated with obesity-related diseases, we observed a negative association between urinary inorganic arsenic concentrations and obesity in this representative cross-sectional analysis. It is unclear if this is a true association in which inorganic arsenic exposure is protective against obesity, or if this finding reflects differential arsenic absorption, metabolism, or storage by adiposity level.

The relationship between PNP, GSTO-1, AS3MT and ADRB3 gene polymorphisms and urinary arsenic concentration among copper smelter and refinery employers

2020 ◽  
Vol 39 (11) ◽  
pp. 1443-1453
Author(s):  
A Szymańska-Chabowska ◽  
T Matys ◽  
Ł Łaczmański ◽  
K Czerwińska ◽  
A Janus ◽  
...  
Keyword(s):  
Arsenic Concentration ◽  
Arsenic Exposure ◽  
Copper Smelter ◽  
Urinary Arsenic ◽  
Lead And Zinc ◽  
Genes Encoding ◽  
Occupationally Exposed ◽  
Cadmium Lead ◽  
The Relationship ◽  
Harmful Effects

Introduction: The aim of this study was to assess the relationship between polymorphisms of genes encoding enzymes involved in arsenic metabolism and urinary arsenic concentration in people occupationally exposed to arsenic. Materials and Methods: The data from 113 employers directly exposed to lead, cadmium, and arsenic in copper smelter in Legnica and Glogow were collected. Urinary arsenic concentration was measured. In addition, blood level of cadmium, lead, and zinc protoporphyrins was assayed. Genetic analyses included polymorphism of PNP (rs 1130650), GSTO-1 (rs 4925), AS3MT (rs 11191439), and ADRB3 (rs4994) genes. Results: Individuals occupationally exposed to arsenic compounds, who have allele T in homozygous constellation in locus rs 1130650 of PNP gene, are predisposed to lower urinary arsenic concentration, while AA homozygosity in locus rs 4925 of GSTO-1 gene may result in statistically significant higher urinary arsenic concentration. Polymorphisms of AS3MT and ADRB3 genes showed no statistically significant correlation with urinary arsenic, however, there was a tendency to higher arsenic concentration in allele A carriers in locus rs4994 of ADRB3 gene and in allele T carriers in rs 11191439 of AS3MT gene. Conclusion: This study indicates that arsenic absorption and metabolism depend on polymorphisms of genes encoding PNP and GSTO-1. Individuals with disadvantageous constellation of polymorphisms are more susceptible to harmful effects of arsenic exposure.

Exposure to inorganic arsenic in drinking water and total urinary arsenic concentration in a Chilean population

2005 ◽  
Vol 98 (2) ◽  
pp. 151-159 ◽  
Author(s):  
Dante D. Caceres ◽  
Paulina Pino ◽  
Nestor Montesinos ◽  
Eduardo Atalah ◽  
Hugo Amigo ◽  
...  
Keyword(s):  
Drinking Water ◽  
Arsenic Concentration ◽  
Inorganic Arsenic ◽  
Urinary Arsenic ◽  
Chilean Population
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