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Wojcik KM, Holle AV, O’Brien KM, White AJ, Karagas MR, Levine KE, Jackson BP, Weinberg CR. Seasonal patterns in trace elements assessed in toenails. Environ Adv 2024; 15:100496. [PMID: 38405619 PMCID: PMC10883685 DOI: 10.1016/j.envadv.2024.100496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/27/2024]
Abstract
BACKGROUND Seasonal patterns in measured exposure biomarkers can cause measurement error in epidemiological studies. There is little research about the seasonality of metals and trace elements when assessed in toenail samples. Adjusting for such patterns in models for estimating associations between long-term exposures and health outcomes can potentially improve precision and reduce bias. OBJECTIVES Assess and describe seasonal patterns in toenail measurements of trace elements. METHODS The Sister Study enrolled women residing in the US, including Puerto Rico, whose sister had been diagnosed with breast cancer. At the time of enrollment, participants removed nail polish and collected their toenail clippings, which were cleaned before analysis. We considered the following elements: iron, vanadium, aluminum, chromium, manganese, cobalt, nickel, copper, zinc, arsenic, selenium, molybdenum, cadmium, tin, antimony, mercury, and lead. For two subsamples of the cohort, we fit trigonometric regression models with toenail element measures as the outcome, using sine and cosine functions of the collection day (transformed to an angle) to capture seasonal patterns. These models can estimate the amplitude and timing of the peaks in measures. We evaluated the evidence for a seasonal effect by comparing for each measured element the trigonometric model to a model that was constant across time. RESULTS There was a seasonal trend in toenail element concentration for iron, aluminum, vanadium, chromium, manganese, cobalt, arsenic, molybdenum, cadmium, tin, and lead, all of which peaked near mid-August. Seasonal patterns were concordant across two non-overlapping samples of women, analyzed in different labs. DISCUSSION Given the evidence supporting seasonal patterns for 11 of the 17 elements measured in toenails, correcting for seasonality of toenail levels of those trace elements in models estimating the association between those exposures and health outcomes is important. The basis for higher concentrations in toenails collected during the summer remains unknown.
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Affiliation(s)
- Kaitlyn M. Wojcik
- Brown School of Social Work and Public Health, Washington University in St. Louis, St. Louis, MO, United States
- Biostatistics and Computational Biology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, United States
- Health Equity and Decision Sciences Laboratory, National Institute on Minority Health and Health Disparities, Bethesda, MD, United States
| | - Ann Von Holle
- Biostatistics and Computational Biology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, United States
| | - Katie M. O’Brien
- Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, United States
| | - Alexandra J. White
- Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, United States
| | - Margaret R. Karagas
- Department of Epidemiology, Geisel School of Medicine at Dartmouth, Dartmouth College, Hanover, NH, United States
| | - Keith E. Levine
- Research Triangle Institute International, Research Triangle Park, NC, United States
| | - Brian P. Jackson
- Department of Earth Sciences, Dartmouth College, Hanover, NH, United States
| | - Clarice R. Weinberg
- Biostatistics and Computational Biology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, United States
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Von Holle A, O'Brien KM, Sandler DP, Janicek R, Karagas MR, White AJ, Niehoff NM, Levine KE, Jackson BP, Weinberg CR. Toenail and serum levels as biomarkers of iron status in pre- and postmenopausal women: correlations and stability over eight-year follow-up. Sci Rep 2024; 14:1682. [PMID: 38242893 PMCID: PMC10798942 DOI: 10.1038/s41598-023-50506-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Accepted: 12/20/2023] [Indexed: 01/21/2024] Open
Abstract
Iron status is often assessed in epidemiologic studies, and toenails offer a convenient alternative to serum because of ease of collection, transport, and storage, and the potential to reflect a longer exposure window. Very few studies have examined the correlation between serum and toenail levels for trace metals. Our aim was to compare iron measures using serum and toenails on both a cross-sectional and longitudinal basis. Using a subset of the US-wide prospective Sister Study cohort, we compared toenail iron measures to serum concentrations for iron, ferritin and percent transferrin saturation. Among 146 women who donated both blood and toenails at baseline, a subsample (59%, n = 86) provided specimens about 8 years later. Cross-sectional analyses included nonparametric Spearman's rank correlations between toenail and serum biomarker levels. We assessed within-woman maintenance of rank across time for the toenail and serum measures and fit mixed effects models to measure change across time in relation to change in menopause status. Spearman correlations at baseline (follow-up) were 0.08 (0.09) for serum iron, 0.08 (0.07) for transferrin saturation, and - 0.09 (- 0.17) for ferritin. The within-woman Spearman correlation for toenail iron between the two time points was higher (0.47, 95% CI 0.30, 0.64) than for serum iron (0.30, 95% CI 0.09, 0.51) and transferrin saturation (0.34, 95% CI 0.15, 0.54), but lower than that for ferritin (0.58, 95% CI 0.43, 0.73). Serum ferritin increased over time while nail iron decreased over time for women who experienced menopause during the 8-years interval. Based on cross-sectional and repeated assessments, our evidence does not support an association between serum biomarkers and toenail iron levels. Toenail iron concentrations did appear to be moderately stable over time but cannot be taken as a proxy for serum iron biomarkers and they may reflect physiologically distinct fates for iron.
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Affiliation(s)
- Ann Von Holle
- Biostatistics and Computational Biology Branch National Institute of Environmental Health Sciences, Mail Drop A3-03, P.O. Box 12233, Research Triangle Park, Durham, NC, 27709, USA
| | - Katie M O'Brien
- Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
| | - Dale P Sandler
- Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
| | - Robert Janicek
- Advanced Research and Diagnostic Laboratory, University of Minnesota, Minneapolis, MN, USA
| | - Margaret R Karagas
- Department of Epidemiology, Geisel School of Medicine at Dartmouth, Dartmouth College, Hanover, NH, USA
| | - Alexandra J White
- Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
| | - Nicole M Niehoff
- Epidemiology Branch, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
- Ontada, Durham, NC, USA
| | | | - Brian P Jackson
- Department of Earth Sciences, Dartmouth College, Hanover, NH, USA
| | - Clarice R Weinberg
- Biostatistics and Computational Biology Branch National Institute of Environmental Health Sciences, Mail Drop A3-03, P.O. Box 12233, Research Triangle Park, Durham, NC, 27709, USA.
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Gadi S, Niture S, Hoang H, Qi Q, Hatcher C, Huang X, Haider J, Norford DC, Leung T, Levine KE, Kumar D. Deficiency of spns1 exacerbates per- and polyfluoroalkyl substances mediated hepatic toxicity and steatosis in zebrafish (Danio rerio). Toxicology 2023; 499:153641. [PMID: 37806615 DOI: 10.1016/j.tox.2023.153641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2023] [Revised: 09/26/2023] [Accepted: 10/05/2023] [Indexed: 10/10/2023]
Abstract
Per- and polyfluoroalkyl substances (PFAS) are man-made long-lasting chemical compounds that are found in everyday household items. Today they occur in the environment as a major group of pollutants. These compounds are broadly used in commercial product preparation such as, for food packaging, nonstick coatings, and firefighting foam. In humans, PFAS can cause immune disorders, impaired fetal development, abnormal skeletal tissue development, osteoarthritis, thyroid dysfunctions, cholesterol changes, affect insulin regulation and lipid metabolism, and are also involved in the development of fatty liver disease. In the current study, we investigated the effect of low, but physiologically relevant, concentrations of perfluorooctanoic acid (PFOA), heptafluorobutyric acid (HFBA), and perfluorotetradecanoic acid (PFTA) on gene expression markers of an inflammatory response (tnfa, il-1b, il-6, rplp0, edem1, and dnajc3a), unfolded protein response (UPR) (bip, atf4a, atf6, xbp1, and ddit3), senescence (p21, pai1, smp30, mdm2, and baxa), lipogenesis (scd1, acc, srebp1, pparγ, and fasn) and autophagy (p62, atg3, atg7, rab7, lc3b, and becn1) in AB wild-type (+/+), spns1-wt sibling (+/+), (+/-) and spns1 homozygous mutant (-/-) zebrafish embryos. Exposure to PFOA and HFBA (50 and 100 nM) specifically modulated inflammatory, UPR, senescence, lipogenic, and autophagy signaling in spns1-wt (+/+), (+/-), and spns1-mutant (-/-) zebrafish embryos. Furthermore, PFOA, but not HFBA, upregulated lipogenic-related gene expression and enhanced hepatic steatosis in spns1-wt (+/+), (+/-) zebrafish embryos. Combined exposure to PFOA, HFBA, and PFTA differentially expressed inflammatory, senescence, lipogenic, and autophagy-associated gene expression in spns1-mutant (-/-) zebrafish embryos compared with spns1-wt (+/+), (+/-) and AB-wt (+/+) zebrafish embryos. In addition, chronic exposure (∼2 months) to PFOA (120-600 nM) upregulated the expression of hepatic lipogenic and steatosis biomarkers in AB-wt (+/+) zebrafish. Collectively, our data suggest that acute/chronic physiologically relevant concentrations of PFOA upregulate inflammatory, UPR, senescence, and lipogenic signaling in spns1-wt (+/+), (+/-) and spns1-mutant (-/-) zebrafish embryos as well as in two-month-old AB-wt zebrafish, by targeting autophagy and hence induces toxicity that could promote nonalcoholic fatty liver disease.
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Affiliation(s)
- Sashi Gadi
- The Julius L. Chambers Biomedical/Biotechnology Research Institute (JLC-BBRI), North Carolina Central University (NCCU), Durham, NC, USA
| | - Suryakant Niture
- The Julius L. Chambers Biomedical/Biotechnology Research Institute (JLC-BBRI), North Carolina Central University (NCCU), Durham, NC, USA; NCCU-RTI Center for Applied Research in Environmental Sciences (CARES), RTI International, Research Triangle Park, Durham, NC, USA.
| | - Hieu Hoang
- The Julius L. Chambers Biomedical/Biotechnology Research Institute (JLC-BBRI), North Carolina Central University (NCCU), Durham, NC, USA
| | - Qi Qi
- The Julius L. Chambers Biomedical/Biotechnology Research Institute (JLC-BBRI), North Carolina Central University (NCCU), Durham, NC, USA
| | - Charles Hatcher
- The Julius L. Chambers Biomedical/Biotechnology Research Institute (JLC-BBRI), North Carolina Central University (NCCU), Durham, NC, USA
| | - Xiaoyan Huang
- The NCCU, JLC-BBRI North Carolina Research Campus, Kannapolis, NC, USA
| | - Jamil Haider
- The NCCU, JLC-BBRI North Carolina Research Campus, Kannapolis, NC, USA
| | - Derek C Norford
- The Julius L. Chambers Biomedical/Biotechnology Research Institute (JLC-BBRI), North Carolina Central University (NCCU), Durham, NC, USA
| | - TinChung Leung
- The NCCU, JLC-BBRI North Carolina Research Campus, Kannapolis, NC, USA
| | - Keith E Levine
- NCCU-RTI Center for Applied Research in Environmental Sciences (CARES), RTI International, Research Triangle Park, Durham, NC, USA
| | - Deepak Kumar
- The Julius L. Chambers Biomedical/Biotechnology Research Institute (JLC-BBRI), North Carolina Central University (NCCU), Durham, NC, USA; NCCU-RTI Center for Applied Research in Environmental Sciences (CARES), RTI International, Research Triangle Park, Durham, NC, USA.
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Wojcik KM, Holle AV, O'Brien KM, White AJ, Karagas MR, Levine KE, Jackson BP, Weinberg CR. Seasonal patterns in trace elements assessed in toenails. Res Sq 2023:rs.3.rs-3093700. [PMID: 37461592 PMCID: PMC10350174 DOI: 10.21203/rs.3.rs-3093700/v1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
Seasonal patterns in measured exposure biomarkers can cause measurement error in epidemiological studies. There is little known about the seasonality of trace elements when measured in toenails. Adjusting for such patterns when estimating associations between long-term exposures and health outcomes could be needed to improve precision and reduce bias. Our goal was to assess seasonal patterns in toenail measurements of trace elements. At enrollment, Sister Study participants, who were US residents, removed polish and collected toenail clippings, which were cleaned before analysis. We measured: iron, vanadium, aluminum, chromium, manganese, cobalt, nickel, copper, zinc, arsenic, selenium, molybdenum, cadmium, tin, antimony, mercury, and lead. For a sample of the cohort we fit trigonometric regression models with toenail element measures as the outcome, using sine and cosine functions of the collection day of the year (transformed to an angle) to assess seasonality. Results were replicated in a second sample of women, with measurements done in a separate lab. There was a seasonal association between day of collection and toenail measures for iron, aluminum, vanadium, chromium, manganese, cobalt, arsenic, molybdenum, cadmium, tin, and lead, all of which peaked near mid-August. Seasonal patterns were concordant across the two samples of women. Given the evidence supporting seasonal patterns for 11 of the 17 elements measured in toenails, correcting for seasonality of toenail levels of those trace elements in models estimating the association between those exposures and health outcomes is important. The basis for higher concentrations in toenails collected during the summer remains unknown.
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Niture S, Gadi S, Qi Q, Rios-Colon L, Khatiwada S, Vandana, Fernando RA, Levine KE, Kumar D. Cyanotoxins Increase Cytotoxicity and Promote Nonalcoholic Fatty Liver Disease Progression by Enhancing Cell Steatosis. Toxins (Basel) 2023; 15:411. [PMID: 37505679 PMCID: PMC10467139 DOI: 10.3390/toxins15070411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2023] [Revised: 06/12/2023] [Accepted: 06/21/2023] [Indexed: 07/29/2023] Open
Abstract
Freshwater prokaryotic cyanobacteria within harmful algal blooms produce cyanotoxins which are considered major pollutants in the aquatic system. Direct exposure to cyanotoxins through inhalation, skin contact, or ingestion of contaminated drinking water can target the liver and may cause hepatotoxicity. In the current study, we investigated the effect of low concentrations of cyanotoxins on cytotoxicity, inflammation, modulation of unfolded protein response (UPR), steatosis, and fibrosis signaling in human hepatocytes and liver cell models. Exposure to low concentrations of microcystin-LR (MC-LR), microcystin-RR (MC-RR), nodularin (NOD), and cylindrospermopsin (CYN) in human bipotent progenitor cell line HepaRG and hepatocellular carcinoma (HCC) cell lines HepG2 and SK-Hep1 resulted in increased cell toxicity. MC-LR, NOD, and CYN differentially regulated inflammatory signaling, activated UPR signaling and lipogenic gene expression, and induced cellular steatosis and fibrotic signaling in HCC cells. MC-LR, NOD, and CYN also regulated AKT/mTOR signaling and inhibited autophagy. Chronic exposure to MC-LR, NOD, and CYN upregulated the expression of lipogenic and fibrosis biomarkers. Moreover, RNA sequencing (RNA seq) data suggested that exposure of human hepatocytes, HepaRG, and HCC HepG2 cells to MC-LR and CYN modulated expression levels of several genes that regulate non-alcoholic fatty liver disease (NAFLD). Our data suggest that low concentrations of cyanotoxins can cause hepatotoxicity and cell steatosis and promote NAFLD progression.
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Affiliation(s)
- Suryakant Niture
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
| | - Sashi Gadi
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
| | - Qi Qi
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
| | - Leslimar Rios-Colon
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
| | - Sabin Khatiwada
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
| | - Vandana
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
| | - Reshan A. Fernando
- NCCU-RTI Center for Applied Research in Environmental Sciences (CARES), RTI International, Durham, NC 27707, USA
| | - Keith E. Levine
- NCCU-RTI Center for Applied Research in Environmental Sciences (CARES), RTI International, Durham, NC 27707, USA
| | - Deepak Kumar
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
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Trottier BA, Niehoff NM, Keil AP, Jones RR, Levine KE, MacNell NS, White AJ. Residential Proximity to Metal-Containing Superfund Sites and Their Potential as a Source of Disparities in Metal Exposure among U.S. Women. Environ Health Perspect 2023; 131:37701. [PMID: 36917478 PMCID: PMC10013684 DOI: 10.1289/ehp11045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Revised: 02/06/2023] [Accepted: 02/21/2023] [Indexed: 06/18/2023]
Affiliation(s)
- Brittany A Trottier
- Hazardous Substances Research Branch, Division of Extramural Research and Training, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
| | - Nicole M Niehoff
- Epidemiology Branch, Division of Intramural Research, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Alexander P Keil
- Department of Epidemiology, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
- Epidemiology Branch, Division of Intramural Research, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Rena R Jones
- Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, Maryland, USA
| | - Keith E Levine
- RTI International, Research Triangle Park, North Carolina, USA
| | | | - Alexandra J White
- Epidemiology Branch, Division of Intramural Research, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
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Niture S, Gadi S, Lin M, Qi Q, Niture SS, Moore JT, Bodnar W, Fernando RA, Levine KE, Kumar D. Cadmium modulates steatosis, fibrosis, and oncogenic signaling in liver cancer cells by activating notch and AKT/mTOR pathways. Environ Toxicol 2023; 38:783-797. [PMID: 36602393 DOI: 10.1002/tox.23731] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2022] [Revised: 12/17/2022] [Accepted: 12/23/2022] [Indexed: 06/17/2023]
Abstract
Cadmium (Cd) is an environmental pollutant that increases hepatotoxicity and the risk of liver diseases. In the current study, we investigated the effect of a physiologically relevant, low concentration of Cd on the regulation of liver cancer cell proliferation, steatosis, and fibrogenic/oncogenic signaling. Exposure to low concentrations of Cd increased endogenous reactive oxygen species (ROS) production and enhanced cell proliferation in a human bipotent progenitor cell line HepaRG and hepatocellular carcinoma (HCC) cell lines. Acute exposure of Cd increased Jagged-1 expression and activated Notch signaling in HepaRG and HCC cells HepG2 and SK-Hep1. Cd activated AKT/mTOR signaling by increasing phosphorylation of AKT-S473 and mTOR-S-4448 residues. Moreover, a low concentration of Cd also promoted cell steatosis and induced fibrogenic signaling in HCC cells. Chronic exposure to low concentrations of Cd-activated Notch and AKT/mTOR signaling induced the expression of pro-inflammatory cytokines tumor necrosis factor-alpha (TNFα) and its downstream target TNF-α-Induced Protein 8 (TNFAIP8). RNA-Seq data revealed that chronic exposure to low concentrations of Cd modulated the expression of several fatty liver disease-related genes involved in cell steatosis/fibrosis in HepaRG and HepG2 cells. Collectively, our data suggest that low concentrations of Cd modulate steatosis along with fibrogenic and oncogenic signaling in HCC cells by activating Notch and AKT/mTOR pathways.
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Affiliation(s)
- Suryakant Niture
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University Durham, North Carolina, USA
- NCCU-RTI Center for Applied Research in Environmental Sciences (CARES), RTI International, Durham, North Carolina, USA
| | - Sashi Gadi
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University Durham, North Carolina, USA
| | - Minghui Lin
- The Fourth People's Hospital of Ningxia Hui Autonomous Region, Yinchuan, China
| | - Qi Qi
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University Durham, North Carolina, USA
| | - Samiksha S Niture
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University Durham, North Carolina, USA
| | - John T Moore
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University Durham, North Carolina, USA
| | - Wanda Bodnar
- NCCU-RTI Center for Applied Research in Environmental Sciences (CARES), RTI International, Durham, North Carolina, USA
| | - Reshan A Fernando
- NCCU-RTI Center for Applied Research in Environmental Sciences (CARES), RTI International, Durham, North Carolina, USA
| | - Keith E Levine
- NCCU-RTI Center for Applied Research in Environmental Sciences (CARES), RTI International, Durham, North Carolina, USA
| | - Deepak Kumar
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University Durham, North Carolina, USA
- NCCU-RTI Center for Applied Research in Environmental Sciences (CARES), RTI International, Durham, North Carolina, USA
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Qi Q, Niture S, Gadi S, Arthur E, Moore J, Levine KE, Kumar D. Per- and polyfluoroalkyl substances activate UPR pathway, induce steatosis and fibrosis in liver cells. Environ Toxicol 2023; 38:225-242. [PMID: 36251517 PMCID: PMC10092267 DOI: 10.1002/tox.23680] [Citation(s) in RCA: 10] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 09/20/2022] [Accepted: 09/25/2022] [Indexed: 05/07/2023]
Abstract
Per- and polyfluoroalkyl substances (PFAS), which include perfluorooctanoic acid (PFOA), heptafluorobutyric acid (HFBA), and perfluorotetradecanoic acid (PFTA), are commonly occurring organic pollutants. Exposure to PFAS affects the immune system, thyroid and kidney function, lipid metabolism, and insulin signaling and is also involved in the development of fatty liver disease and cancer. The molecular mechanisms by which PFAS cause fatty liver disease are not understood in detail. In the current study, we investigated the effect of low physiologically relevant concentrations of PFOA, HFBA, and PFTA on cell survival, steatosis, and fibrogenic signaling in liver cell models. Exposure of PFOA and HFBA (10 to 1000 nM) specifically promoted cell survival in HepaRG and HepG2 cells. PFAS increased the expression of TNFα and IL6 inflammatory markers, increased endogenous reactive oxygen species (ROS) production, and activated unfolded protein response (UPR). Furthermore, PFAS enhanced cell steatosis and fibrosis in HepaRG and HepG2 cells which were accompanied by upregulation of steatosis (SCD1, ACC, SRBP1, and FASN), and fibrosis (TIMP2, p21, TGFβ) biomarkers expression, respectively. RNA-seq data suggested that chronic exposures to PFOA modulated the expression of fatty acid/lipid metabolic genes that are involved in the development of NFALD and fatty liver disease. Collectively our data suggest that acute/chronic physiologically relevant concentrations of PFAS enhance liver cell steatosis and fibrosis by the activation of the UPR pathway and by modulation of NFALD-related gene expression.
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Affiliation(s)
- Qi Qi
- Julius L. Chambers Biomedical Biotechnology Research InstituteNorth Carolina Central UniversityDurhamNorth CarolinaUSA
| | - Suryakant Niture
- Julius L. Chambers Biomedical Biotechnology Research InstituteNorth Carolina Central UniversityDurhamNorth CarolinaUSA
- NCCU‐RTI Center for Applied Research in Environmental Sciences (CARES)RTI International, Research Triangle ParkDurhamNorth CarolinaUSA
| | - Sashi Gadi
- Julius L. Chambers Biomedical Biotechnology Research InstituteNorth Carolina Central UniversityDurhamNorth CarolinaUSA
| | - Elena Arthur
- Julius L. Chambers Biomedical Biotechnology Research InstituteNorth Carolina Central UniversityDurhamNorth CarolinaUSA
| | - John Moore
- Julius L. Chambers Biomedical Biotechnology Research InstituteNorth Carolina Central UniversityDurhamNorth CarolinaUSA
| | - Keith E. Levine
- NCCU‐RTI Center for Applied Research in Environmental Sciences (CARES)RTI International, Research Triangle ParkDurhamNorth CarolinaUSA
| | - Deepak Kumar
- Julius L. Chambers Biomedical Biotechnology Research InstituteNorth Carolina Central UniversityDurhamNorth CarolinaUSA
- NCCU‐RTI Center for Applied Research in Environmental Sciences (CARES)RTI International, Research Triangle ParkDurhamNorth CarolinaUSA
- Department of Pharmaceutical SciencesNorth Carolina Central UniversityDurhamNorth CarolinaUSA
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Harrington JM, Poitras EP, Weber FX, Fernando RA, Liyanapatirana C, Robinson VG, Levine KE, Waidyanatha S. Validation of Analytical Method for Determination of Thallium in Rodent Plasma and Tissues by Inductively Coupled Plasma-Mass Spectrometry (ICP-MS). ANAL LETT 2022; 55:1269-1280. [PMID: 35571259 PMCID: PMC9103374 DOI: 10.1080/00032719.2021.1993876] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Thallium (Tl) can be released as a byproduct of smelting, mining, and other industries, causing human exposure. There are knowledge gaps on the toxicity of thallium compounds, so the National Toxicology Program is investigating the toxicity of thallium (I) sulfate in rodents. We developed and validated a method to quantitate Tl in rodent plasma and secondary matrices. Primary matrix standards and validation samples were digested with nitric acid and analyzed for Tl by inductively-coupled plasma - mass spectrometry (ICP-MS). Method performance was validated for linearity, accuracy, precision, and other criteria. Calibration was linear from 1.25 to 500 ng Tl/mL plasma; accuracy (RE) was -5.9 to 2.6% for all calibration standards. The lower limit of quantitation (LLOQ) was 1.25 ng Tl/mL plasma, and the limit of detection was 0.0370 ng Tl/mL plasma. Intra- and interday RE and precision (RSD) were -5.6 to -1.7% and ≤0.8% (intraday) and -4.8 to -1.3% and ≤4.3% (interday), respectively, at three sample concentration levels. Standards up to 10.0 × 103 ng/mL could be analyzed by dilution with digested blank matrix, with -6.4% RE and 5.4% RSD. Method was also evaluated in post-natal day 4 (PND4) Hsd:Sprague Dawley SD (HSD) dam and pup plasma, gestation day 18 (GD 18) HSD rat fetal homogenate, HSD rat urine, female HSD rat brain homogenate, female B6C3F1 mouse plasma. Background Tl was detected in control fetal and brain homogenates and urine at < 30% of LLOQ response. Results demonstrate that the method is suitable for determination of Tl in rodent matrices for toxicology studies.
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Affiliation(s)
- James M. Harrington
- RTI International, Research Triangle Park, NC, United States,† Corresponding author, Phone: 919-541-8777,
| | - Eric P. Poitras
- RTI International, Research Triangle Park, NC, United States
| | - Frank X. Weber
- RTI International, Research Triangle Park, NC, United States
| | | | | | - Veronica G. Robinson
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Keith E. Levine
- RTI International, Research Triangle Park, NC, United States
| | - Suramya Waidyanatha
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
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Harrington JM, Haines LG, Essader AS, Liyanapatirana C, Poitras EA, Weber FX, Levine KE, Fernando RA, Robinson VG, Waidyanatha S. Quantitation of Total Vanadium in Rodent Plasma and Urine by Inductively Coupled Plasma - Mass Spectrometry (ICP-MS). ANAL LETT 2021; 54:2777-2788. [PMID: 34898679 DOI: 10.1080/00032719.2021.1890107] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
Human exposure to vanadium (V) is anticipated because it is a drinking water contaminant. Due to limited data on soluble V salts, the National Toxicology Program is investigating the toxicity in rodents following drinking water exposure. Measurement of internal V dose allows for interpretation of toxicology data. The objective of this study was to develop and validate an inductively coupled plasma-mass spectrometric method to quantitate total V in rat plasma. The method was linear (r ≥ 0.99) from 5.00 - 1,000 ng V/mL. Intra- and inter-day relative error (% RE) and relative standard deviation (% RSD) of spiked plasma samples were 8.5% - 15.6% RE and ≤ 1.8% RSD and 7.3% - 11.7% RE and ≤ 3.1% RSD, respectively. The limit of detection was 0.268 ng V/mL plasma and absolute percent recovery was 113%. Standards up to 7,500 ng V/mL plasma were diluted into the validated range (5.6% RE, 0.9% RSD). V in extracted plasma samples over 15 days at ambient and refrigerated conditions was from 97.7 - 126% of day 0. Determined plasma V concentrations after three freeze-thaw cycles and after frozen storage for up to 63 days ranged from 100 - 106% and 100 - 122% of day 0, respectively. The method was extended to rat urine (accuracy and precision -2.0 - 0.3% RE and <0.6% RSD, respectively for same linear range). These data demonstrate that the method is suitable to quantitate V in rat plasma and urine.
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Affiliation(s)
| | - Laura G Haines
- Analytical Sciences, RTI International, Research Triangle Park, NC, USA
| | - Amal S Essader
- Analytical Sciences, RTI International, Research Triangle Park, NC, USA
| | | | - Eric A Poitras
- Analytical Sciences, RTI International, Research Triangle Park, NC, USA
| | - Frank X Weber
- Analytical Sciences, RTI International, Research Triangle Park, NC, USA
| | - Keith E Levine
- Analytical Sciences, RTI International, Research Triangle Park, NC, USA
| | - Reshan A Fernando
- Analytical Sciences, RTI International, Research Triangle Park, NC, USA
| | - Veronica G Robinson
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
| | - Suramya Waidyanatha
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, NC, USA
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11
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Niehoff NM, O’Brien KM, Keil AP, Levine KE, Liyanapatirana C, Haines LG, Waidyanatha S, Weinberg CR, White AJ. Metals and Breast Cancer Risk: A Prospective Study Using Toenail Biomarkers. Am J Epidemiol 2021; 190:2360-2373. [PMID: 34268559 PMCID: PMC8799900 DOI: 10.1093/aje/kwab204] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Revised: 07/08/2021] [Accepted: 07/12/2021] [Indexed: 12/12/2022] Open
Abstract
The role of metals in breast cancer is of interest because of their carcinogenic and endocrine-disrupting capabilities. Evidence from epidemiologic studies remains elusive, and prior studies have not investigated metal mixtures. In a case cohort nested within the Sister Study (enrolled in 2003-2009; followed through September 2017), we measured concentrations of 15 metals in toenails collected at enrollment in a race/ethnicity-stratified sample of 1,495 cases and a subcohort of 1,605 women. We estimated hazard ratios and 95% confidence intervals for each metal using Cox regression and robust variance. We used quantile g-computation to estimate the joint association between multiple metals and breast cancer risk. The average duration of follow-up was 7.5 years. There was little evidence supporting an association between individual metals and breast cancer. An exception was molybdenum, which was associated with reduced incidence of overall breast cancer risk (third tertile vs. first tertile: hazard ratio = 0.82, 95% confidence interval: 0.67, 1.00). An inverse association for antimony was observed among non-Hispanic Black women. Predefined groups of metals (all metals, nonessential metals, essential metals, and metalloestrogens) were not strongly associated with breast cancer. This study offers little support for metals, individually or as mixtures, as risk factors for breast cancer. Mechanisms for inverse associations with some metals warrant further study.
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Affiliation(s)
- Nicole M Niehoff
- Correspondence to Dr. Nicole M. Niehoff, Epidemiology Branch, National Institute of Environmental Health Sciences, 111 T.W. Alexander Drive, Room A344, Research Triangle Park, NC 27709 (e-mail: )
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12
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Niture S, Lin M, Qi Q, Moore JT, Levine KE, Fernando RA, Kumar D. Role of Autophagy in Cadmium-Induced Hepatotoxicity and Liver Diseases. J Toxicol 2021; 2021:9564297. [PMID: 34422041 PMCID: PMC8371627 DOI: 10.1155/2021/9564297] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 07/12/2021] [Accepted: 08/03/2021] [Indexed: 12/12/2022] Open
Abstract
Cadmium (Cd) is a toxic pollutant that is associated with several severe human diseases. Cd can be easily absorbed in significant quantities from air contamination/industrial pollution, cigarette smoke, food, and water and primarily affects the liver, kidney, and lungs. Toxic effects of Cd include hepatotoxicity, nephrotoxicity, pulmonary toxicity, and the development of various human cancers. Cd is also involved in the development and progression of fatty liver diseases and hepatocellular carcinoma. Cd affects liver function via modulation of cell survival/proliferation, differentiation, and apoptosis. Moreover, Cd dysregulates hepatic autophagy, an endogenous catabolic process that detoxifies damaged cell organelles or dysfunctional cytosolic proteins through vacuole-mediated sequestration and lysosomal degradation. In this article, we review recent developments and findings regarding the role of Cd in the modulation of hepatotoxicity, autophagic function, and liver diseases at the molecular level.
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Affiliation(s)
- Suryakant Niture
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
| | - Minghui Lin
- The Fourth People's Hospital of Ningxia Hui Autonomous Region, Yinchuan 750021, China
| | - Qi Qi
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
| | - John T. Moore
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
| | - Keith E. Levine
- RTI International, Research Triangle Park, Durham, NC 27709, USA
| | | | - Deepak Kumar
- Julius L. Chambers Biomedical Biotechnology Research Institute, North Carolina Central University, Durham, NC 27707, USA
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Harrington JM, Haines LG, Levine KE, Liyanapatirana C, Essader AS, Fernando RA, Robinson VG, Roberts GK, Stout MD, Hooth MJ, Waidyanatha S. Corrigendum to "Internal dose of vanadium in rats following repeated exposure to vanadyl sulfate and sodium orthovanadate via drinking water" [Toxicology and Applied Pharmacology 412 (2021) 115395]. Toxicol Appl Pharmacol 2021; 423:115546. [PMID: 33905758 DOI: 10.1016/j.taap.2021.115546] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Laura G Haines
- RTI International, Research Triangle Park, NC, United States
| | - Keith E Levine
- RTI International, Research Triangle Park, NC, United States
| | | | - Amal S Essader
- RTI International, Research Triangle Park, NC, United States
| | | | - Veronica G Robinson
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Georgia K Roberts
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Matthew D Stout
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Michelle J Hooth
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Suramya Waidyanatha
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States.
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Harrington JM, Haines LG, Levine KE, Liyanapatirana C, Essader AS, Fernando RA, Robinson VG, Roberts GK, Stout MD, Hooth MJ, Waidyanatha S. Internal dose of vanadium in rats following repeated exposure to vanadyl sulfate and sodium orthovanadate via drinking water. Toxicol Appl Pharmacol 2021; 412:115395. [PMID: 33421504 PMCID: PMC8631130 DOI: 10.1016/j.taap.2021.115395] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 12/28/2020] [Accepted: 12/31/2020] [Indexed: 11/24/2022]
Abstract
Vanadium is a ubiquitous environmental contaminant that exists in multiple oxidation states. Humans are exposed to vanadyl (V4+) and vanadate (V5+) from dietary supplements, food, and drinking water and hence there is a concern for adverse human health. The current investigation is aimed at identifying vanadium oxidation states in vitro and in vivo and internal concentrations following exposure of rats to vanadyl sulfate (V4+) or sodium metavanadate (V5+) via drinking water for 14 d. Investigations in simulated gastric and intestinal fluids showed that V4+ was stable in gastric fluid while V5+ was stable in intestinal fluid. Analysis of rodent plasma showed that the only vanadium present was V4+, regardless of the exposed compound suggesting conversion of V5+ to V4+ in vivo and/or instability of V5+ species in biological matrices. Plasma, blood, and liver concentrations of total vanadium, after normalizing for vanadium dose consumed, were higher in male and female rats following exposure to V5+ than to V4+. Following exposure to either V4+ or V5+, the total vanadium concentration in plasma was 2- to 3-fold higher than in blood suggesting plasma as a better matrix than blood for measuring vanadium in future work. Liver to blood ratios were 4-7 demonstrating significant tissue retention following exposure to both compounds. In conclusion, these data point to potential differences in absorption and disposition properties of V4+ and V5+ salts and may explain the higher sensitivity in rats following drinking water exposure to V5+ than V4+ and highlights the importance of internal dose determination in toxicology studies.
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Affiliation(s)
| | - Laura G Haines
- RTI International, Research Triangle Park, NC, United States
| | - Keith E Levine
- RTI International, Research Triangle Park, NC, United States
| | | | - Amal S Essader
- RTI International, Research Triangle Park, NC, United States
| | | | - Veronica G Robinson
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Georgia K Roberts
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Matthew D Stout
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Michelle J Hooth
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Suramya Waidyanatha
- Division of the National Toxicology Program, NIEHS, Research Triangle Park, NC, United States.
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15
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Redmon JH, Levine KE, Lebov J, Harrington J, Kondash AJ. A comparative review: Chronic Kidney Disease of unknown etiology (CKDu) research conducted in Latin America versus Asia. Environ Res 2021; 192:110270. [PMID: 33035557 DOI: 10.1016/j.envres.2020.110270] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 09/19/2020] [Accepted: 09/19/2020] [Indexed: 06/11/2023]
Abstract
INTRODUCTION The incidence of chronic kidney disease of unknown or uncertain etiology (CKDu) is recognized as a global non-communicable health crisis. The goal of this work is to compare the types of research studies in Latin America and Asia, two regions with increasing CKDu incidence. METHODS A comparative literature review was conducted to evaluate the CKDu research design for peer-reviewed articles published from 2015 to 2019. Full texts were reviewed to identify study location, study type, study design, risk factors evaluated, and if applicable, sample type and number. RESULTS In Asia and Latin America, 82 and 65 articles were identified in total, respectively, with 55 field studies in Asia versus 34 in Latin America. In Asia, research was focused on drinking water (34), heavy metals (20), and agrochemical product usage (19) as potential risk factors. In Latin America, research focused mostly on heat stress/dehydration (36) and agrochemical product usage (18) as potential CKDu risk factors. Biological samples were collected more frequently than environmental samples, especially in Latin America. DISCUSSION Research to pinpoint the risk factors associated with CKDu to date is not standardized and typically limited in geographical scope. The emphasis of CKDu research varies by geographic region, with a greater priority placed on water quality and chemical exposure in Asia, versus dehydration and heat stress in Latin America. Using a harmonized approach to CKDu research would yield improved understanding of the risk factors associated with CKDu and how they compare across affected regions.
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Affiliation(s)
| | | | - Jill Lebov
- RTI International, Research Triangle Park, NC, USA
| | | | - A J Kondash
- RTI International, Research Triangle Park, NC, USA
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16
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Deubler EL, Gapstur SM, Diver WR, Gaudet MM, Hodge JM, Stevens VL, McCullough ML, Haines LG, Levine KE, Teras LR. Erythrocyte levels of cadmium and lead and risk of B-cell non-Hodgkin lymphoma and multiple myeloma. Int J Cancer 2020; 147:3110-3118. [PMID: 32506449 DOI: 10.1002/ijc.33136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2019] [Revised: 04/28/2020] [Accepted: 05/26/2020] [Indexed: 12/20/2022]
Abstract
Cadmium and lead are persistent environmental toxins that are known or probable carcinogens, based on evidence for causality for nonhematologic cancers. Associations of these metals with risk of non-Hodgkin lymphoma (NHL) and multiple myeloma (MM) are unknown but biologically plausible. To examine the associations of circulating levels of lead and cadmium exposure with risk of B-cell NHL (B-NHL) and multiple myeloma, we conducted a nested case-control study among 299 incident B-cell NHLs and 76 MM cases within the Cancer Prevention Study-II Nutrition Cohort (CPS-II NC). Each case was incidence-density matched to two eligible controls on age, race, sex and blood draw date. Conditional logistic regression was used to estimate relative risks (RR) and 95% confidence intervals (CI) for lymphoid malignancies overall and stratified by subtype. We observed a significant positive association between high erythrocyte lead concentration and risk of lymphoid malignancies overall (RR = 1.16, 95% CI: 1.02-1.33 per 17.6 μg/L (1 standard deviation [SD])) and follicular lymphoma in particular (RR = 1.80, 95% CI: 1.15-2.80 per SD). In contrast, there was no association between erythrocyte cadmium and risk of B-NHL (RR = 0.89, 95% CI: 0.75-1.06 per 0.37 μg/L [1 SD]), or any B-NHL subtypes; but a strong inverse association with MM risk (RR = 0.59, 95% CI: 0.38-0.89, per SD). Results from our study suggest a positive association between erythrocyte lead level and risk of lymphoid malignancies and a possible inverse association between cadmium and myeloma. Additional research is needed to confirm and further explore these findings.
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Affiliation(s)
- Emily L Deubler
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, Georgia, USA
| | - Susan M Gapstur
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, Georgia, USA
| | - W Ryan Diver
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, Georgia, USA
| | - Mia M Gaudet
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, Georgia, USA
| | - James M Hodge
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, Georgia, USA
| | - Victoria L Stevens
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, Georgia, USA
| | - Marjorie L McCullough
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, Georgia, USA
| | | | | | - Lauren R Teras
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, Georgia, USA
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17
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Dombek T, Poitras E, Hand J, Schichtel B, Harrington JM, Levine KE. Total sulfur analysis of fine particulate mass on nylon filters by ICP-OES. J Environ Qual 2020; 49:762-768. [PMID: 33016392 DOI: 10.1002/jeq2.20066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 02/07/2020] [Accepted: 02/13/2020] [Indexed: 06/11/2023]
Abstract
Sulfur (S) and sulfate (SO4 2- ) in fine particulate matter (PM2.5 ) are monitored by the Interagency Monitoring of Protected Visual Environments (IMPROVE) network at remote and rural sites across the United States. Within the IMPROVE network, S is determined from X-ray fluorescence (XRF) spectroscopy from a Teflon filter, and SO4 2- is determined via ion chromatography (IC) from a nylon filter. Differences in S and SO4 2- estimates may indicate the presence of organosulfur (OS) species or biases between sampling and analytical methods. To reduce potential biases, an inductively coupled plasma-optical emission spectroscopy (ICP-OES) method was developed to allow for analysis of SO4 2- and S from a single filter extract. Sulfur (ICP-OES) and SO4 2- (IC) estimates from 2016 IMPROVE filters correlated strongly, suggesting that, on average, ICP-OES accurately estimated S. However, observed differences between slopes suggested the presence of water-soluble OS species, especially during summer. Organosulfur species are important indicators of secondary organic aerosols formed through reactions of biogenic and anthropogenic pollutants and can be quantified through laboratory techniques such as reverse-phase liquid chromatography (RPLC) or hydrophilic liquid interaction chromatography (HILIC) coupled to electrospray ionization-high-resolution tandem mass spectrometry (RPLC/ESI-HR-MS/MS and HILIC/ESI-HR-MS/MS, respectively), and field techniques using Aerodyne aerosol mass spectrometry (AMS). However, these methods are costly and introduce relatively large uncertainties when scaled for large networks such as IMPROVE. The method described in this report provides an inexpensive complement to XRF, which measures total S (insoluble and water-soluble S) to estimate water-soluble S and OS concentrations in PM.
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Affiliation(s)
- Tracy Dombek
- Analytical Sciences, RTI International, 3040 E. Cornwallis Rd., PO Box 12194, Research Triangle Park, NC, 27709-2194, USA
| | - Eric Poitras
- Analytical Sciences, RTI International, 3040 E. Cornwallis Rd., PO Box 12194, Research Triangle Park, NC, 27709-2194, USA
| | - Jenny Hand
- Cooperative Institute for Research in the Atmosphere, Colorado State Univ., Fort Collins, CO, 80523, USA
| | - Bret Schichtel
- National Park Service, Air Resources Division, Lakewood, CO, 80235, USA
| | - James M Harrington
- Analytical Sciences, RTI International, 3040 E. Cornwallis Rd., PO Box 12194, Research Triangle Park, NC, 27709-2194, USA
| | - Keith E Levine
- Analytical Sciences, RTI International, 3040 E. Cornwallis Rd., PO Box 12194, Research Triangle Park, NC, 27709-2194, USA
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18
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Redmon JH, Levine KE, Aceituno AM, Litzenberger K, Gibson JM. Lead in drinking water at North Carolina childcare centers: Piloting a citizen science-based testing strategy. Environ Res 2020; 183:109126. [PMID: 32062181 DOI: 10.1016/j.envres.2020.109126] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2019] [Revised: 11/13/2019] [Accepted: 01/07/2020] [Indexed: 06/10/2023]
Abstract
BACKGROUND Drinking water is a lingering hazard in the effort to eliminate childhood exposure to lead (Pb), a neurotoxin that affects cognitive and behavioral development. This study characterized Pb in municipal drinking water at North Carolina, US, childcare centers. The study also demonstrates a scalable, citizen science-based drinking water testing strategy for Pb at childcare centers. METHODS Licensed childcare centers in four North Carolina counties were recruited. One administrator per center completed a survey and was trained to collect first-draw drinking water samples in their center. Samples were shipped with pre-paid labels for laboratory analysis using inductively coupled plasma mass spectrometry. Multilevel logistic regression and Bayesian network analysis were used to identify factors associated with a risk of exceeding the 1 μg/L American Academy of Pediatrics reference level and the US Environmental Protection Agency (US EPA) 15 μg/L treatment-based action level. Results were provided to centers along with risk mitigation recommendations. RESULTS Of 103 enrolled centers, 86 completed the study, submitting 1,266 drinking water samples in total. Approximately 77% of drinking water samples contained detectable Pb (≥0.1 μg/L), and 97% of centers had at least one drinking water sample with detectable Pb. More than 63% of centers had at least one drinking water sample with >1 μg/L Pb, and 17% of centers had at least one drinking water sample with Pb above 15 μg/L. There was high variability in Pb concentrations at water points within the same center. DISCUSSION This study demonstrated a high prevalence and variability of Pb in first-draw samples of drinking water at childcare centers in North Carolina, US. Results underscore the importance of testing for Pb at every tap used for drinking and cooking in childcare centers. The use of employees as citizen scientists is a feasible strategy to identify Pb in specific drinking water taps.
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Deubler EL, Gapstur SM, Diver WR, Gaudet MM, Hodge JM, Stevens VL, McCullough ML, Haines LG, Levine KE, Teras LR. Abstract 5037: Erythrocyte levels of cadmium and lead and risk of B-cell non-Hodgkin lymphoma and multiple myeloma. Cancer Res 2019. [DOI: 10.1158/1538-7445.am2019-5037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Abstract
Heavy metals such as cadmium and lead are ubiquitous in the environment and have been classified as carcinogens by the International Agency for Research on Cancer. While research is limited, associations of heavy metals with risk of lymphoid malignancies is plausible given that other environmental factors have been associated with these cancers. To further explore associations of cadmium and lead exposure with risk of lymphoid malignancies, we conducted a nested case-control study within the Cancer Prevention Study-II (CPS-II) Nutrition cohort, a U.S. prospective cohort of men and women. Incident B-cell non-Hodgkin lymphomas (B-NHL) and multiple myelomas (MM) were identified from 32,704 CPS-II participants who were cancer-free at time of blood collection between 1998-2001. Cases included the following histologic subtypes: chronic lymphocytic leukemia/small lymphocytic lymphoma (CLL/SLL), diffuse large B-cell lymphoma (DLBCL), follicular lymphoma (FL), multiple myeloma (MM), and other B-cell lymphoma. Each case was matched to two eligible controls that were selected among those who were cancer-free at the time of the case’s diagnosis. The matching factors included race, age, gender, and blood draw date. Cadmium and lead levels were measured in stored erythrocytes from the blood draw. Conditional logistic regression models were used to estimate relative risks (RR) and 95% confidence intervals (CI) for lymphoid malignancy overall and stratified by NHL subtype. The final analytic cohort consisted of 375 B-NHL or MM cases (95 DBLCL, 90 CLL/SLL, 62 FL, 76 MM, and 52 other B-cell lymphoma), and 750 matched controls. The cohort was 56% male, and an average of 69.9 years of age at the time of blood draw. There was a significant, positive association between erythrocyte levels of lead and risk of lymphoid malignancy overall (RR: 1.17, 95% CI: 1.03 - 1.33 per 1 standard deviation (SD; 17.6 µg/L) increase in lead level). This association appeared to be driven by FL (per SD of lead RR: 1.76, 95% CI: 1.21 - 2.57). No associations between lead and DLBCL, CLL/SLL, MM, or other B-cell lymphoma were observed. Results appeared similar when additionally controlling for alcohol use and smoking status. There was no association between cadmium and lymphoid malignancies overall; however, cadmium was inversely associated with risk of multiple myeloma (Q4 vs Q1 RR: 0.30, 95% CI: 0.12 - 0.75). Preliminary results from this nested case-control analysis suggests that a positive association between erythrocyte lead levels and risk of lymphoid malignancies (particularly follicular lymphoma) may exist. Reasons for an inverse association between cadmium and risk of multiple myeloma are unclear but might be due to chance. Further research is needed to fully explore and confirm these findings.
Citation Format: Emily L. Deubler, Susan M. Gapstur, W. Ryan Diver, Mia M. Gaudet, James M. Hodge, Victoria L. Stevens, Marjorie L. McCullough, Laura G. Haines, Keith E. Levine, Lauren R. Teras. Erythrocyte levels of cadmium and lead and risk of B-cell non-Hodgkin lymphoma and multiple myeloma [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 5037.
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Gaudet MM, Deubler EL, Kelly RS, Ryan Diver W, Teras LR, Hodge JM, Levine KE, Haines LG, Lundh T, Lenner P, Palli D, Vineis P, Bergdahl IA, Gapstur SM, Kyrtopoulos SA. Blood levels of cadmium and lead in relation to breast cancer risk in three prospective cohorts. Int J Cancer 2018; 144:1010-1016. [PMID: 30117163 DOI: 10.1002/ijc.31805] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2018] [Revised: 07/10/2018] [Accepted: 07/26/2018] [Indexed: 01/05/2023]
Abstract
Cadmium and lead have been classified as carcinogens by the International Agency for Research on Cancer. However, their associations with breast cancer risk are unknown despite their persistence in the environment and ubiquitous human exposure. We examined associations of circulating levels of cadmium and lead with breast cancer risk in three case-control studies nested within the Cancer Prevention Study-II (CPS-II) LifeLink Cohort, European Prospective Investigation into Cancer and Nutrition - Italy (EPIC-Italy) and the Northern Sweden Health and Disease Study (NSHDS) cohorts. Metal levels were measured in stored erythrocytes from 1,435 cases and 1,433 controls using inductively coupled plasma-mass spectrometry. Summary relative risks (RR) and 95% confidence intervals (CI) were calculated using random-effects models with each study result weighted by the within- and between-study variances. I2 values were calculated to estimate proportion of between study variation. Using common cut-points, cadmium levels were not associated with breast cancer risk in the CPS-II cohort (continuous RR = 1.01, 95% CI 0.76-1.34), but were inversely associated with risk in the EPIC- Italy (continuous RR = 0.80, 95% CI 0.61-1.03) and NSHDS cohorts (continuous RR = 0.73, 95% CI 0.54-0.97). The inverse association was also evident in the meta-analysis (continuous RR = 0.84, 95% CI 0.69-1.01) with low between-study heterogeneity. Large differences in lead level distributions precluded a meta-analysis of their association with breast cancer risk; no associations were found in the three studies. Adult cadmium and lead levels were not associated with higher risk of breast cancer in our large meta-analysis.
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Affiliation(s)
- Mia M Gaudet
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, GA
| | - Emily L Deubler
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, GA
| | - Rachel S Kelly
- Channing Division of Network Medicine, Brigham and Women's Hospital Harvard Medical School, Boston, MA
| | - W Ryan Diver
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, GA
| | - Lauren R Teras
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, GA
| | - James M Hodge
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, GA
| | | | | | - Thomas Lundh
- Division of Occupational and Environmental MedicineLund University, Lund, Sweden
| | - Per Lenner
- Department of Radiation Science, Umeå University, Umeå, Sweden
| | - Domenico Palli
- Molecular and Nutritional Epidemiology Unit, ISPO, Cancer Prevention and Research Institute, Florence, Italy
| | - Paolo Vineis
- Grantham Institute, Imperial College, London, United Kingdom
| | - Ingvar A Bergdahl
- Department of Public Health and Clinical Medicine, Occupational and Environmental Medicine, Umeå University, Umeå, Sweden.,Department of Biobank Research, Umeå University, Umeå, Sweden
| | - Susan M Gapstur
- Behavioral and Epidemiology Research Group, American Cancer Society, Atlanta, GA
| | - Soterios A Kyrtopoulos
- National Hellenic Research Foundation, Institute of Biology, Medicinal Chemistry and Biotechnology, Athens, Greece
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21
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Redmon JH, Gibson JM, Woodward KP, Aceituno AM, Levine KE. Safeguarding Children's Health: Time to Enact a Health-Based Standard and Comprehensive Testing, Mitigation, and Communication Protocol for Lead in Drinking Water. N C Med J 2018; 79:313-317. [PMID: 30228138 DOI: 10.18043/ncm.79.5.313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Lead was a known toxin before the Roman Empire, yet exposure remains a public health concern today. Although there is no safe lead exposure level, a health-based drinking water standard has not been established. The Clean Water for Carolina Kids Study highlights the need for a health-based standard.
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Affiliation(s)
- Jennifer Hoponick Redmon
- senior environmental health scientist, RTI International, Research Triangle Park, North Carolina
| | - Jacqueline MacDonald Gibson
- associate professor, Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina
| | - Katherine P Woodward
- research environmental health scientist, RTI International, Research Triangle Park, North Carolina
| | - Anna M Aceituno
- public health scientist, RTI International, Research Triangle Park, North Carolina
| | - Keith E Levine
- director, Analytical Sciences, RTI International, Research Triangle Park, North Carolina
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22
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Roswall N, Hvidtfeldt UA, Harrington J, Levine KE, Sørensen M, Tjønneland A, Meliker JR, Raaschou-Nielsen O. Predictors of Urinary Arsenic Levels among Postmenopausal Danish Women. Int J Environ Res Public Health 2018; 15:ijerph15071340. [PMID: 29949863 PMCID: PMC6068487 DOI: 10.3390/ijerph15071340] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Revised: 06/18/2018] [Accepted: 06/23/2018] [Indexed: 11/16/2022]
Abstract
Arsenic is a risk factor for several noncommunicable diseases, even at low doses. Urinary arsenic (UAs) concentration is a good biomarker for internal dose, and demographic, dietary, and lifestyle factors are proposed predictors in nonoccupationally exposed populations. However, most predictor studies are limited in terms of size and number of predictors. We investigated demographic, dietary, and lifestyle determinants of UAs concentrations in 744 postmenopausal Danish women who had UAs measurements and questionnaire data on potential predictors. UAs concentrations were determined using mass spectrometry (ICP-MS), and determinants of the concentration were investigated using univariate and multivariate regression models. We used a forward selection procedure for model optimization. In all models, fish, alcohol, and poultry intake were associated with higher UAs concentration, and tap water, fruit, potato, and dairy intake with lower concentration. A forward regression model explained 35% (R2) of the variation in concentrations. Age, smoking, education, and area of residence did not predict concentration. The results were relatively robust across sensitivity analyses. The study suggested that UAs concentration in postmenopausal women was primarily determined by dietary factors, with fish consumption showing the strongest direct association. However, the majority of variation in UAs concentration in this study population is still unexplained.
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Affiliation(s)
- Nina Roswall
- Danish Cancer Society Research Center, Strandboulevarden 49, 2100 Copenhagen, Denmark.
| | - Ulla A Hvidtfeldt
- Danish Cancer Society Research Center, Strandboulevarden 49, 2100 Copenhagen, Denmark.
| | - James Harrington
- Analytical Sciences Division, Research Triangle Institute, 3040 East Cornwallis Road, PO Box 12194, Research Triangle Park, NC 27709-2194, USA.
| | - Keith E Levine
- Analytical Sciences Division, Research Triangle Institute, 3040 East Cornwallis Road, PO Box 12194, Research Triangle Park, NC 27709-2194, USA.
| | - Mette Sørensen
- Danish Cancer Society Research Center, Strandboulevarden 49, 2100 Copenhagen, Denmark.
- Department of Natural Science and Environment, Roskilde University, Universitetsvej 1, 4000 Roskilde, Denmark.
| | - Anne Tjønneland
- Danish Cancer Society Research Center, Strandboulevarden 49, 2100 Copenhagen, Denmark.
| | - Jaymie R Meliker
- Program in Public Health, Department of Family, Population, and Preventive Medicine, Stony Brook University, 101 Nicolls Road, Stony Brook, NY 11794, USA.
| | - Ole Raaschou-Nielsen
- Danish Cancer Society Research Center, Strandboulevarden 49, 2100 Copenhagen, Denmark.
- Department of Environmental Science, Aarhus University, Frederiksborgvej 399, 4000 Roskilde, Denmark.
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23
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Vacchi-Suzzi C, Porucznik CA, Cox KJ, Zhao Y, Ahn H, Harrington JM, Levine KE, Demple B, Marsit CJ, Gonzalez A, Luft B, Meliker JR. Temporal variability of urinary cadmium in spot urine samples and first morning voids. J Expo Sci Environ Epidemiol 2017; 27:306-312. [PMID: 27168395 PMCID: PMC5461949 DOI: 10.1038/jes.2016.28] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2015] [Accepted: 04/02/2016] [Indexed: 05/25/2023]
Abstract
Cadmium is a carcinogenic heavy metal. Urinary levels of cadmium are considered to be an indicator of long-term body burden, as cadmium accumulates in the kidneys and has a half-life of at least 10 years. However, the temporal stability of the biomarker in urine samples from a non-occupationally exposed population has not been rigorously established. We used repeated measurements of urinary cadmium (U-Cd) in spot urine samples and first morning voids from two separate cohorts, to assess the temporal stability of the samples. Urine samples from two cohorts including individuals of both sexes were measured for cadmium and creatinine. The first cohort (Home Observation of Perinatal Exposure (HOPE)) consisted of 21 never-smokers, who provided four first morning urine samples 2-5 days apart, and one additional sample roughly 1 month later. The second cohort (World Trade Center-Health Program (WTC-HP)) consisted of 78 individuals, including 52 never-smokers, 22 former smokers and 4 current smokers, who provided 2 spot urine samples 6 months apart, on average. Intra-class correlation was computed for groups of replicates from each individual to assess temporal variability. The median creatinine-adjusted U-Cd level (0.19 and 0.21 μg/g in the HOPE and WTC-HP, respectively) was similar to levels recorded in the United States by the National Health and Nutrition Examination Survey. The intra-class correlation (ICC) was high (0.76 and 0.78 for HOPE and WTC-HP, respectively) and similar between cohorts, irrespective of whether samples were collected days or months apart. Both single spot or first morning urine cadmium samples show good to excellent reproducibility in low-exposure populations.
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Affiliation(s)
- Caterina Vacchi-Suzzi
- Program in Public Health, Department of Family, Population and
Preventive Medicine, Stony Brook University, Stony Brook, New York 11794, USA
| | - Christina A. Porucznik
- Department of Family and Preventive Medicine, University of Utah,
Salt Lake City, Utah 84108, USA
| | - Kyley J. Cox
- Department of Family and Preventive Medicine, University of Utah,
Salt Lake City, Utah 84108, USA
| | - Yuan Zhao
- Department of Applied Mathematics and Statistics, Stony Brook
University, Stony Brook, New York 11794, USA
| | - Hongshik Ahn
- Department of Applied Mathematics and Statistics, Stony Brook
University, Stony Brook, New York 11794, USA
| | - James M. Harrington
- Analytical Sciences Department, Innovation, Technology and
Development, RTI International, Research Triangle Park, North Carolina 27709,
USA
| | - Keith E. Levine
- Analytical Sciences Department, Innovation, Technology and
Development, RTI International, Research Triangle Park, North Carolina 27709,
USA
| | - Bruce Demple
- Department of Pharmacological Sciences, Stony Brook University,
Stony Brook, New York 11794, USA
| | - Carmen J. Marsit
- Department of Pharmacology and Toxicology, Norris Cotton Cancer
Center, Dartmouth Medical School, New Hampshire 03755, USA
- Department of Family and Community Medicine, Norris Cotton Cancer
Center, Dartmouth Medical School, New Hampshire 03755, USA
| | - Adam Gonzalez
- Department of Psychiatry, Stony Brook University, Stony Brook, New
York 11794, USA
| | - Benjamin Luft
- Department of Medicine, Stony Brook University, Stony Brook, New
York 11794, USA
| | - Jaymie R. Meliker
- Program in Public Health, Department of Family, Population and
Preventive Medicine, Stony Brook University, Stony Brook, New York 11794, USA
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24
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Levine KE, Collins BJ, Stout MD, Wyde M, Afton SE, Essader AS, Ennis TJ, Amato KE, McWilliams AC, Fletcher BL, Fernando RA, Harrington JM, Catlin N, Robinson VG, Waidyanatha S. Characterization of Zinc Carbonate Basic as a Source of Zinc in a Rodent Study Investigating the Effects of Dietary Deficiency or Excess. ANAL LETT 2017; 50:2447-2464. [PMID: 30930463 DOI: 10.1080/00032719.2017.1293073] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
Zinc deficiency and excess can result in adverse health outcomes. There is conflicting evidence regarding whether excess or deficient zinc in the diet can contribute to carcinogenicity. The objective of this study was to characterize zinc carbonate basic for use as a source of dietary zinc in a rodent toxicity and carcinogenicity study investigating the effects of zinc deficiency and excess. Because of the complex chemistries of zinc carbonate basic compounds, inconsistent nomenclature, and literature and reference spectra gaps, it was necessary to employ multiple analytical techniques, including Karl Fischer titration, combustion analysis, inductively coupled plasma-optical emission spectrometry, X-ray diffraction, infrared spectroscopy, X-ray fluorescence spectrometry, and thermogravimetric analysis to characterize the test article. Based on the collective evidence and through the process of elimination, the test article was found to be composed mainly of zinc carbonate basic with zinc oxide as a minor component. The zinc content was determined to be 56.6% (w/w) with heavy metals such as arsenic, cadmium, mercury and lead below the limit of quantitation of less than or equal to 0.01%. The test material was stable at ambient temperature. Based on the work described in this manuscript, the test article was suitable for use as a source of zinc in studies of deficiency and excess in the diet.
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Affiliation(s)
- Keith E Levine
- RTI International, 3040 E. Cornwallis Road, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Bradley J Collins
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, MD EC-06, P.O. Box 12233, 111 T.W. Alexander Drive, Research Triangle Park, NC, 27709, USA
| | - Matthew D Stout
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, MD EC-06, P.O. Box 12233, 111 T.W. Alexander Drive, Research Triangle Park, NC, 27709, USA
| | - Michael Wyde
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, MD EC-06, P.O. Box 12233, 111 T.W. Alexander Drive, Research Triangle Park, NC, 27709, USA
| | - Scott E Afton
- RTI International, 3040 E. Cornwallis Road, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Amal S Essader
- RTI International, 3040 E. Cornwallis Road, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Todd J Ennis
- RTI International, 3040 E. Cornwallis Road, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Kelly E Amato
- RTI International, 3040 E. Cornwallis Road, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Andrea C McWilliams
- RTI International, 3040 E. Cornwallis Road, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Brenda L Fletcher
- RTI International, 3040 E. Cornwallis Road, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Reshan A Fernando
- RTI International, 3040 E. Cornwallis Road, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - James M Harrington
- RTI International, 3040 E. Cornwallis Road, P.O. Box 12194, Research Triangle Park, NC, 27709, USA
| | - Natasha Catlin
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, MD EC-06, P.O. Box 12233, 111 T.W. Alexander Drive, Research Triangle Park, NC, 27709, USA
| | - Veronica G Robinson
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, MD EC-06, P.O. Box 12233, 111 T.W. Alexander Drive, Research Triangle Park, NC, 27709, USA
| | - Suramya Waidyanatha
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, MD EC-06, P.O. Box 12233, 111 T.W. Alexander Drive, Research Triangle Park, NC, 27709, USA
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25
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Eriksen KT, McElroy JA, Harrington JM, Levine KE, Pedersen C, Sørensen M, Tjønneland A, Meliker JR, Raaschou-Nielsen O. Urinary Cadmium and Breast Cancer: A Prospective Danish Cohort Study. J Natl Cancer Inst 2016; 109:djw204. [DOI: 10.1093/jnci/djw204] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2015] [Accepted: 08/05/2016] [Indexed: 11/13/2022] Open
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26
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Fennell TR, Mortensen NP, Black SR, Snyder RW, Levine KE, Poitras E, Harrington JM, Wingard CJ, Holland NA, Pathmasiri W, Sumner SCJ. Disposition of intravenously or orally administered silver nanoparticles in pregnant rats and the effect on the biochemical profile in urine. J Appl Toxicol 2016; 37:530-544. [PMID: 27696470 DOI: 10.1002/jat.3387] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2016] [Revised: 08/09/2016] [Accepted: 08/11/2016] [Indexed: 11/08/2022]
Abstract
Few investigations have been conducted on the disposition and fate of silver nanoparticles (AgNP) in pregnancy. The distribution of a single dose of polyvinylpyrrolidone (PVP)-stabilized AgNP was investigated in pregnant rats. Two sizes of AgNP, 20 and 110 nm, and silver acetate (AgAc) were used to investigate the role of AgNP diameter and particle dissolution in tissue distribution, internal dose and persistence. Dams were administered AgNP or AgAc intravenously (i.v.) (1 mg kg-1 ) or by gavage (p.o.) (10 mg kg-1 ), or vehicle alone, on gestation day 18 and euthanized at 24 or 48 h post-exposure. The silver concentration in tissues was measured using inductively-coupled plasma mass spectrometry. The distribution of silver in dams was influenced by route of administration and AgNP size. The highest concentration of silver (μg Ag g-1 tissue) at 48 h was found in the spleen for i.v. administered AgNP, and in the lungs for AgAc. At 48 h after p.o. administration of AgNP, the highest concentration was measured in the cecum and large intestine, and for AgAc in the placenta. Silver was detected in placenta and fetuses for all groups. Markers of cardiovascular injury, oxidative stress marker, cytokines and chemokines were not significantly elevated in exposed dams compared to vehicle-dosed control. NMR metabolomics analysis of urine indicated that AgNP and AgAc exposure impact the carbohydrate, and amino acid metabolism. This study demonstrates that silver crosses the placenta and is transferred to the fetus regardless of the form of silver. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Timothy R Fennell
- Discovery - Science - Technology, RTI International, Research Triangle Park, NC, 27709, USA
| | - Ninell P Mortensen
- Discovery - Science - Technology, RTI International, Research Triangle Park, NC, 27709, USA
| | - Sherry R Black
- Discovery - Science - Technology, RTI International, Research Triangle Park, NC, 27709, USA
| | - Rodney W Snyder
- Discovery - Science - Technology, RTI International, Research Triangle Park, NC, 27709, USA
| | - Keith E Levine
- Discovery - Science - Technology, RTI International, Research Triangle Park, NC, 27709, USA
| | - Eric Poitras
- Discovery - Science - Technology, RTI International, Research Triangle Park, NC, 27709, USA
| | - James M Harrington
- Discovery - Science - Technology, RTI International, Research Triangle Park, NC, 27709, USA
| | - Christopher J Wingard
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Nathan A Holland
- Department of Physiology, Brody School of Medicine, East Carolina University, Greenville, NC, 27834, USA
| | - Wimal Pathmasiri
- Discovery - Science - Technology, RTI International, Research Triangle Park, NC, 27709, USA
| | - Susan C J Sumner
- Discovery - Science - Technology, RTI International, Research Triangle Park, NC, 27709, USA
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27
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Levine KE, Redmon JH, Elledge MF, Wanigasuriya KP, Smith K, Munoz B, Waduge VA, Periris-John RJ, Sathiakumar N, Harrington JM, Womack DS, Wickremasinghe R. Quest to identify geochemical risk factors associated with chronic kidney disease of unknown etiology (CKDu) in an endemic region of Sri Lanka-a multimedia laboratory analysis of biological, food, and environmental samples. Environ Monit Assess 2016; 188:548. [PMID: 27591985 DOI: 10.1007/s10661-016-5524-8] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 08/01/2016] [Indexed: 05/09/2023]
Abstract
The emergence of a new form of chronic kidney disease of unknown etiology (CKDu) in Sri Lanka's North Central Province (NCP) has become a catastrophic health crisis. CKDu is characterized as slowly progressing, irreversible, and asymptomatic until late stages and, importantly, not attributed to diabetes, hypertension, or other known risk factors. It is postulated that the etiology of CKDu is multifactorial, involving genetic predisposition, nutritional and dehydration status, exposure to one or more environmental nephrotoxins, and lifestyle factors. The objective of this limited geochemical laboratory analysis was to determine the concentration of a suite of heavy metals and trace element nutrients in biological samples (human whole blood and hair) and environmental samples (drinking water, rice, soil, and freshwater fish) collected from two towns within the endemic NCP region in 2012 and 2013. This broad panel, metallomics/mineralomics approach was used to shed light on potential geochemical risk factors associated with CKDu. Based on prior literature documentation of potential nephrotoxins that may play a role in the genesis and progression of CKDu, heavy metals and fluoride were selected for analysis. The geochemical concentrations in biological and environmental media areas were quantified. Basic statistical measurements were subsequently used to compare media against applicable benchmark values, such as US soil screening levels. Cadmium, lead, and mercury were detected at concentrations exceeding US reference values in many of the biological samples, suggesting that study participants are subjected to chronic, low-level exposure to these elements. Within the limited number of environmental media samples, arsenic was determined to exceed initial risk screening and background concentration values in soil, while data collected from drinking water samples reflected the unique hydrogeochemistry of the region, including the prevalence of hard or very hard water, and fluoride, iron, manganese, sodium, and lead exceeding applicable drinking water standards in some instances. Current literature suggests that the etiology of CKDu is likely multifactorial, with no single biological or hydrogeochemical parameter directly related to disease genesis and progression. This preliminary screening identified that specific constituents may be present above levels of concern, but does not compare results against specific kidney toxicity values or cumulative risk related to a multifactorial disease process. The data collected from this limited investigation are intended to be used in the subsequent study design of a comprehensive and multifactorial etiological study of CKDu risk factors that includes sample collection, individual surveys, and laboratory analyses to more fully evaluate the potential environmental, behavioral, genetic, and lifestyle risk factors associated with CKDu.
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Affiliation(s)
- Keith E Levine
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA.
| | | | - Myles F Elledge
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA
| | | | - Kristin Smith
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA
| | - Breda Munoz
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA
| | | | - Roshini J Periris-John
- Section of Epidemiology and Biostatistics, School of Population Health, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Nalini Sathiakumar
- Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - James M Harrington
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA
| | - Donna S Womack
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA
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28
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Levine KE, Redmon JH, Elledge MF, Wanigasuriya KP, Smith K, Munoz B, Waduge VA, Periris-John RJ, Sathiakumar N, Harrington JM, Womack DS, Wickremasinghe R. Quest to identify geochemical risk factors associated with chronic kidney disease of unknown etiology (CKDu) in an endemic region of Sri Lanka-a multimedia laboratory analysis of biological, food, and environmental samples. Environ Monit Assess 2016; 188:548. [PMID: 27591985 DOI: 10.3768/rtipress.2014.rb.0007.1405] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2016] [Accepted: 08/01/2016] [Indexed: 05/24/2023]
Abstract
The emergence of a new form of chronic kidney disease of unknown etiology (CKDu) in Sri Lanka's North Central Province (NCP) has become a catastrophic health crisis. CKDu is characterized as slowly progressing, irreversible, and asymptomatic until late stages and, importantly, not attributed to diabetes, hypertension, or other known risk factors. It is postulated that the etiology of CKDu is multifactorial, involving genetic predisposition, nutritional and dehydration status, exposure to one or more environmental nephrotoxins, and lifestyle factors. The objective of this limited geochemical laboratory analysis was to determine the concentration of a suite of heavy metals and trace element nutrients in biological samples (human whole blood and hair) and environmental samples (drinking water, rice, soil, and freshwater fish) collected from two towns within the endemic NCP region in 2012 and 2013. This broad panel, metallomics/mineralomics approach was used to shed light on potential geochemical risk factors associated with CKDu. Based on prior literature documentation of potential nephrotoxins that may play a role in the genesis and progression of CKDu, heavy metals and fluoride were selected for analysis. The geochemical concentrations in biological and environmental media areas were quantified. Basic statistical measurements were subsequently used to compare media against applicable benchmark values, such as US soil screening levels. Cadmium, lead, and mercury were detected at concentrations exceeding US reference values in many of the biological samples, suggesting that study participants are subjected to chronic, low-level exposure to these elements. Within the limited number of environmental media samples, arsenic was determined to exceed initial risk screening and background concentration values in soil, while data collected from drinking water samples reflected the unique hydrogeochemistry of the region, including the prevalence of hard or very hard water, and fluoride, iron, manganese, sodium, and lead exceeding applicable drinking water standards in some instances. Current literature suggests that the etiology of CKDu is likely multifactorial, with no single biological or hydrogeochemical parameter directly related to disease genesis and progression. This preliminary screening identified that specific constituents may be present above levels of concern, but does not compare results against specific kidney toxicity values or cumulative risk related to a multifactorial disease process. The data collected from this limited investigation are intended to be used in the subsequent study design of a comprehensive and multifactorial etiological study of CKDu risk factors that includes sample collection, individual surveys, and laboratory analyses to more fully evaluate the potential environmental, behavioral, genetic, and lifestyle risk factors associated with CKDu.
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Affiliation(s)
- Keith E Levine
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA.
| | | | - Myles F Elledge
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA
| | | | - Kristin Smith
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA
| | - Breda Munoz
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA
| | | | - Roshini J Periris-John
- Section of Epidemiology and Biostatistics, School of Population Health, Faculty of Medical and Health Sciences, University of Auckland, Auckland, New Zealand
| | - Nalini Sathiakumar
- Department of Epidemiology, University of Alabama at Birmingham, Birmingham, AL, USA
| | - James M Harrington
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA
| | - Donna S Womack
- RTI International, 3040 East Cornwallis Road, Research Triangle Park, NC, 27709-2194, USA
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29
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Harrington JM, Young DJ, Fry RC, Weber FX, Sumner SS, Levine KE. Validation of a Metallomics Analysis of Placenta Tissue by Inductively-Coupled Plasma Mass Spectrometry. Biol Trace Elem Res 2016; 169:164-73. [PMID: 26155965 PMCID: PMC4763796 DOI: 10.1007/s12011-015-0431-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Accepted: 06/29/2015] [Indexed: 01/05/2023]
Abstract
Trace elements can play an important role in maternal health and fetal development, and deficiencies in some essential minerals including zinc and copper have been correlated in some individuals to the development of birth defects and adverse health outcomes later in life. The exact etiology of conditions like preeclampsia and the effects of fetal exposure to toxic metals has not been determined, making the assessment of trace element levels crucial to the elucidation of the causes of conditions like preeclampsia. Previous studies analyzing serum and placenta tissue have produced conflicting findings, suggesting the need for a robust, validated sample preparation and analysis method for the determination of trace elements in placenta. In this report, an acid digestion method and analysis by ICP-MS for a broad metallomics/mineralomics panel of trace elements is developed and validated over three experimental days for inter- and intraday precision and accuracy, linear range, matrix impact, and dilution verification. Spike recovery experiments were performed for the essential elements chromium (Cr), iron (Fe), cobalt (Co), nickel (Ni), copper (Cu), and zinc (Zn), and the toxic elements arsenic (As), cadmium (Cd), and lead (Pb) at levels equal to and in excess of native concentrations in control placenta tissue. The validated method will be essential for the development of scientific studies of maternal health and toxic metal exposure effects in childhood.
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Affiliation(s)
- James M Harrington
- Trace Inorganics Department, Technologies for Industry and the Environment, RTI International, Durham, NC, 27709, USA
| | - Daniel J Young
- Trace Inorganics Department, Technologies for Industry and the Environment, RTI International, Durham, NC, 27709, USA
| | - Rebecca C Fry
- Gillings School of Global Public Health, University of North Carolina, Chapel Hill, NC, 27599, USA
| | - Frank X Weber
- Trace Inorganics Department, Technologies for Industry and the Environment, RTI International, Durham, NC, 27709, USA
| | - Susan S Sumner
- Discovery Science Technology, RTI International, Research Triangle Park, NC, 27709, USA
| | - Keith E Levine
- Trace Inorganics Department, Technologies for Industry and the Environment, RTI International, Durham, NC, 27709, USA.
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30
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Vacchi-Suzzi C, Karimi R, Kruse D, Silbernagel SM, Levine KE, Rohlman DS, Meliker JR. Low-level mercury, omega-3 index and neurobehavioral outcomes in an adult US coastal population. Eur J Nutr 2015; 55:699-711. [PMID: 25832490 DOI: 10.1007/s00394-015-0890-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 03/22/2015] [Indexed: 12/18/2022]
Abstract
BACKGROUND Neurodevelopmental effects of omega-3 fatty acids and mercury from fish consumption have been characterized in children. In contrast, neurobehavioral outcomes associated with fish are not well studied in adults. OBJECTIVE This study of avid seafood consumers on Long Island (NY, USA) sought to define associations between mercury, seafood consumption, omega-3 fatty acids and neurobehavioral outcomes. METHODS A computer-based test system was used to assess neurobehavioral function. Blood total Hg (Hg) and omega-3 index were measured in 199 adult avid seafood eaters, who also completed the neurobehavioral assessment and an extensive food and fish frequency and demographic questionnaire. RESULTS For most of the outcomes considered, neither Hg nor omega-3 index was associated with neurobehavioral outcomes after adjustment for key confounding variables. Fish consumption, however, was associated with decreased odds of both self-reported fatigue (OR 0.85; 95 % CI 0.72, 1.01) and a constellation of neurologic symptoms (OR 0.79; 95 % CI 0.66, 0.96). CONCLUSIONS Results from our study provide little evidence that omega-3 fatty acids or Hg is associated with cognitive function in adult avid seafood consumers. Larger studies are needed to confirm our finding of associations between fish consumption and decreased self-reported fatigue and neurologic impairment.
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Affiliation(s)
- Caterina Vacchi-Suzzi
- Program in Public Health, Department of Preventive Medicine, Stony Brook University, Stony Brook, NY, 11794, USA.
| | - Roxanne Karimi
- School of Marine and Atmospheric Sciences, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Danielle Kruse
- School of Medicine, Stony Brook University, Stony Brook, NY, 11794, USA
| | - Susan M Silbernagel
- Division of Allergy and Infectious Diseases, Department of Medicine, University of Washington, Seattle, WA, 98195, USA
| | - Keith E Levine
- Trace Inorganics Department, Technologies for Industry and the Environment, RTI International, Research Triangle Park, NC, 27709, USA
| | - Diane S Rohlman
- Occupational and Environmental Health, University of Iowa, Iowa City, IA, 52242, USA
- Oregon Institute for Occupational Health Sciences, Oregon Health and Science University, Portland, OR, 97239, USA
| | - Jaymie R Meliker
- Program in Public Health, Department of Preventive Medicine, Stony Brook University, Stony Brook, NY, 11794, USA
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Levine KE, Young DJ, Afton SE, Harrington JM, Essader AS, Weber FX, Fernando RA, Thayer K, Hatch EE, Robinson VG, Waidyanatha S. Development, validation, and application of an ultra-performance liquid chromatography-sector field inductively coupled plasma mass spectrometry method for simultaneous determination of six organotin compounds in human serum. Talanta 2015; 140:115-121. [PMID: 26048832 DOI: 10.1016/j.talanta.2015.03.022] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Accepted: 03/15/2015] [Indexed: 11/29/2022]
Abstract
Organotin compounds (OTCs) are heavily employed by industry for a wide variety of applications, including the production of plastics and as biocides. Reports of environmental prevalence, differential toxicity between OTCs, and poorly characterized human exposure have fueled the demand for sensitive, selective speciation methods. The objective of this investigation was to develop and validate a rapid, sensitive, and selective analytical method for the simultaneous determination of a suite of organotin compounds, including butyl (mono-, di-, and tri-substituted) and phenyl (mono-, di-, and tri-substituted) species in human serum. The analytical method utilized ultra-performance liquid chromatography (UPLC) coupled with sector field inductively coupled plasma mass spectrometry (SF-ICP-MS). The small (sub-2 µm) particle size of the UPLC column stationary phase and the sensitivity of the SF-ICP-MS enabled separation and sensitive determination of the analyte suite with a runtime of approximately 3 min. Validation activities included demonstration of method linearity over the concentration range of approximately 0.250-13.661 ng mL(-1), depending on the species; intraday precision of less than 21%, interday precision of less than 18%, intraday accuracy of -5.3% to 19%, and interday accuracy of -14% to 15% for all species; specificity, and matrix impact. In addition, sensitivity, and analyte stability under different storage scenarios were evaluated. Analyte stability was found to be limited for most species in freezer, refrigerator, and freeze-thaw conditions. The validated method was then applied for the determination of the OTCs in human serum samples from women participating in the Snart-Foraeldre/MiljØ (Soon-Parents/Environment) Study. The concentration of each OTC ranged from below the experimental limit of quantitation to 10.929 ng tin (Sn) mL(-1) serum. Speciation values were confirmed by a total Sn analysis.
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Affiliation(s)
- Keith E Levine
- RTI International, Research Triangle Park, NC, United States
| | - Daniel J Young
- RTI International, Research Triangle Park, NC, United States
| | - Scott E Afton
- RTI International, Research Triangle Park, NC, United States
| | | | - Amal S Essader
- RTI International, Research Triangle Park, NC, United States
| | - Frank X Weber
- RTI International, Research Triangle Park, NC, United States
| | | | - Kristina Thayer
- Division of National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Elizabeth E Hatch
- Department of Epidemiology, Boston University School of Public Health, Boston, MA, United States
| | - Veronica G Robinson
- Division of National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
| | - Suramya Waidyanatha
- Division of National Toxicology Program, NIEHS, Research Triangle Park, NC, United States
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McWilliams AC, Martin AA, Levine MA, Levine KE, Felder L, Young DJ, Harrington JM. Preparation of Thin Films for Elemental Analysis of Nail Polish by Wavelength Dispersive X-Ray Fluorescence Spectroscopy. ANAL LETT 2015. [DOI: 10.1080/00032719.2015.1015072] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Poitras EP, Levine MA, Harrington JM, Essader AS, Fennell TR, Snyder RW, Black SL, Sumner SS, Levine KE. Development of an analytical method for assessment of silver nanoparticle content in biological matrices by inductively coupled plasma mass spectrometry. Biol Trace Elem Res 2015; 163:184-92. [PMID: 25308764 PMCID: PMC4297743 DOI: 10.1007/s12011-014-0141-2] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/25/2014] [Accepted: 09/29/2014] [Indexed: 01/30/2023]
Abstract
Silver nanoparticles (AgNPs) are a broad class of synthetic nanoparticles that are utilized in a wide variety of consumer products as antimicrobial agents. Despite their widespread use, a detailed understanding of their toxicological characteristics and biological and environmental hazards is not available. To support research into the biodistribution and toxicology of AgNPs, it is necessary to develop a suitable method for the assessment of AgNP content in biological samples. Two methods were developed and validated to analyze citrate-coated AgNP content that utilize acid digestion of rodent feces and liver tissue samples, and a third method was developed for the dilution and direct analysis of rodent urine samples. Following sample preparation, the silver content of each sample was determined by inductively coupled plasma mass spectrometry (ICP-MS) to quantify the silver and AgNP levels present. Analysis of rat feces matrix yielded analytical recoveries ranging from 82 to 93 %. Liver tissue spiked with a formulation of AgNPs over a range of concentrations yielded analytical recoveries between 88 and 90 %, providing acceptable accuracy results. The analysis of silver in urine samples exhibited recovery values ranging from 80 to 85 % for AgNP formulations and 62-84 % for standard silver ion solutions. All determinations exhibited a high degree of analytical precision. The results obtained here suggest that matrix interference plays a minimal role in AgNP recovery in feces and liver tissue, while the urine matrix can exhibit a significant effect on the determination of silver content.
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Affiliation(s)
- Eric P. Poitras
- Trace Inorganics Department, Discovery Sciences and Technology, RTI International, 3040 E Cornwallis Rd., PO Box 12194, Research Triangle Park, NC 27709
| | - Michael A. Levine
- Trace Inorganics Department, Discovery Sciences and Technology, RTI International, 3040 E Cornwallis Rd., PO Box 12194, Research Triangle Park, NC 27709
| | - James M. Harrington
- Trace Inorganics Department, Discovery Sciences and Technology, RTI International, 3040 E Cornwallis Rd., PO Box 12194, Research Triangle Park, NC 27709
| | - Amal S. Essader
- Trace Inorganics Department, Discovery Sciences and Technology, RTI International, 3040 E Cornwallis Rd., PO Box 12194, Research Triangle Park, NC 27709
| | - Timothy R. Fennell
- Systems and Translational Sciences, Discovery Sciences and Technology, RTI International, 3040 E Cornwallis Rd., PO Box 12194, Research Triangle Park, NC 27709
| | - Rodney W. Snyder
- Systems and Translational Sciences, Discovery Sciences and Technology, RTI International, 3040 E Cornwallis Rd., PO Box 12194, Research Triangle Park, NC 27709
| | - Sherry L. Black
- Systems and Translational Sciences, Discovery Sciences and Technology, RTI International, 3040 E Cornwallis Rd., PO Box 12194, Research Triangle Park, NC 27709
| | - Susan S. Sumner
- Systems and Translational Sciences, Discovery Sciences and Technology, RTI International, 3040 E Cornwallis Rd., PO Box 12194, Research Triangle Park, NC 27709
| | - Keith E. Levine
- Trace Inorganics Department, Discovery Sciences and Technology, RTI International, 3040 E Cornwallis Rd., PO Box 12194, Research Triangle Park, NC 27709
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34
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Pickard AJ, Liu F, Bartenstein TF, Haines LG, Levine KE, Kucera GL, Bierbach U. Redesigning the DNA-targeted chromophore in platinum-acridine anticancer agents: a structure-activity relationship study. Chemistry 2014; 20:16174-87. [PMID: 25302716 PMCID: PMC4244275 DOI: 10.1002/chem.201404845] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Indexed: 01/07/2023]
Abstract
Platinum-acridine hybrid agents show low-nanomolar potency in chemoresistant non-small cell lung cancer (NSCLC), but high systemic toxicity in vivo. To reduce the promiscuous genotoxicity of these agents and improve their pharmacological properties, a modular build-click-screen approach was used to evaluate a small library of twenty hybrid agents containing truncated and extended chromophores of varying basicities. Selected derivatives were resynthesized and tested in five NSCLC cell lines representing large cell, squamous cell, and adenocarcinomas. 7-Aminobenz[c]acridine was identified as a promising scaffold in a hybrid agent (P1-B1) that maintained submicromolar activity in several of the DNA-repair proficient and p53-mutant cancer models, while showing improved tolerability in mice by 32-fold compared to the parent platinum-acridine (P1-A1). The distribution and DNA/RNA adduct levels produced by the acridine- and benz[c]acridine-based analogues in NCI-H460 cells (confocal microscopy, ICP-MS), and their ability to bind G-quadruplex forming DNA sequences (CD spectroscopy, HR-ESMS) were studied. P1-B1 emerges as a less genotoxic, more tolerable, and potentially more target-selective hybrid agent than P1-A1.
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Affiliation(s)
- Amanda J. Pickard
- Department of Chemistry, Wake Forest University Winston-Salem, NC 27109 (USA)
| | - Fang Liu
- Department of Chemistry, Wake Forest University Winston-Salem, NC 27109 (USA)
| | | | | | | | - Gregory L. Kucera
- Department of Internal Medicine, Section on Hematology and Oncology Wake Forest University Health Sciences Winston-Salem, NC 27157 (USA)
| | - Ulrich Bierbach
- Department of Chemistry, Wake Forest University Winston-Salem, NC 27109 (USA)
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35
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Redmon JH, Elledge MF, Womack DS, Wickremashinghe R, Wanigasuriya KP, Peiris-John RJ, Lunyera J, Smith K, Raymer JH, Levine KE. Additional perspectives on chronic kidney disease of unknown aetiology (CKDu) in Sri Lanka--lessons learned from the WHO CKDu population prevalence study. BMC Nephrol 2014. [PMID: 25069485 DOI: 10.1186/1471‐2369‐15‐125] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
The recent emergence of an apparently new form of chronic kidney disease of unknown aetiology (CKDu) has become a serious public health crisis in Sri Lanka. CKDu is slowly progressive, irreversible, and asymptomatic until late stages, and is not attributable to hypertension, diabetes, or other known aetiologies. In response to the scope and severity of the emerging CKDu health crisis, the Sri Lanka Ministry of Health and the World Health Organization initiated a collaborative research project from 2009 through 2012 to investigate CKDu prevalence and aetiology. The objective of this paper is to discuss the recently published findings of this investigation and present additional considerations and recommendations that may enhance subsequent investigations designed to identify and understand CKDu risk factors in Sri Lanka or other countries.
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Affiliation(s)
- Jennifer Hoponick Redmon
- RTI International, Center for Health and Environmetnal Modeling, 3040 East Cornwallis Rd, Research Triangle Park, NC 27709-2194, USA.
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36
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Redmon JH, Elledge MF, Womack DS, Wickremashinghe R, Wanigasuriya KP, Peiris-John RJ, Lunyera J, Smith K, Raymer JH, Levine KE. Additional perspectives on chronic kidney disease of unknown aetiology (CKDu) in Sri Lanka--lessons learned from the WHO CKDu population prevalence study. BMC Nephrol 2014; 15:125. [PMID: 25069485 PMCID: PMC4120717 DOI: 10.1186/1471-2369-15-125] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2014] [Accepted: 07/16/2014] [Indexed: 11/24/2022] Open
Abstract
The recent emergence of an apparently new form of chronic kidney disease of unknown aetiology (CKDu) has become a serious public health crisis in Sri Lanka. CKDu is slowly progressive, irreversible, and asymptomatic until late stages, and is not attributable to hypertension, diabetes, or other known aetiologies. In response to the scope and severity of the emerging CKDu health crisis, the Sri Lanka Ministry of Health and the World Health Organization initiated a collaborative research project from 2009 through 2012 to investigate CKDu prevalence and aetiology. The objective of this paper is to discuss the recently published findings of this investigation and present additional considerations and recommendations that may enhance subsequent investigations designed to identify and understand CKDu risk factors in Sri Lanka or other countries.
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Affiliation(s)
- Jennifer Hoponick Redmon
- RTI International, Center for Health and Environmetnal Modeling, 3040 East Cornwallis Rd, Research Triangle Park, NC 27709-2194, USA.
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37
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Harrington JM, Young DJ, Essader AS, Sumner SJ, Levine KE. Analysis of human serum and whole blood for mineral content by ICP-MS and ICP-OES: development of a mineralomics method. Biol Trace Elem Res 2014; 160:132-42. [PMID: 24917052 PMCID: PMC4091818 DOI: 10.1007/s12011-014-0033-5] [Citation(s) in RCA: 85] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Accepted: 05/26/2014] [Indexed: 12/15/2022]
Abstract
Minerals are inorganic compounds that are essential to the support of a variety of biological functions. Understanding the range and variability of the content of these minerals in biological samples can provide insight into the relationships between mineral content and the health of individuals. In particular, abnormal mineral content may serve as an indicator of illness. The development of robust, reliable analytical methods for the determination of the mineral content of biological samples is essential to developing biological models for understanding the relationship between minerals and illnesses. This paper describes a method for the analysis of the mineral content of small volumes of serum and whole blood samples from healthy individuals. Interday and intraday precision for the mineral content of the blood (250 μL) and serum (250 μL) samples was measured for eight essential minerals--sodium (Na), calcium (Ca), magnesium (Mg), potassium (K), iron (Fe), zinc (Zn), copper (Cu), and selenium (Se)--by plasma spectrometric methods and ranged from 0.635 to 10.1% relative standard deviation (RSD) for serum and 0.348-5.98% for whole blood. A comparison of the determined ranges for ten serum samples and six whole blood samples provided good agreement with literature reference ranges. The results demonstrate that the digestion and analysis methods can be used to reliably measure the content of these minerals and potentially of other minerals.
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Affiliation(s)
- James M Harrington
- Trace Inorganics Department, Technologies for Industry and the Environment, RTI International, Research Triangle Park, NC, 27709, USA,
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38
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Levine KE, Han L, Gwinn WM, Morgan DL, Ross GT, Essader AS, Fernando RA, Haines LG, Robinson VG. Development and Optimization of a Procedure for the Determination of Indium-Tin Oxide Particle Size and Concentration in Cellular Media. ANAL LETT 2014. [DOI: 10.1080/00032719.2013.878841] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Harrington JM, Nelson CM, Weber FX, Bradham KD, Levine KE, Rice J. Evaluation of methods for analysis of lead in air particulates: an intra-laboratory and inter-laboratory comparison. Environ Sci Process Impacts 2014; 16:256-261. [PMID: 24310648 DOI: 10.1039/c3em00486d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In 2008, the United States Environmental Protection Agency (USEPA) set a new National Ambient Air Quality Standard (NAAQS) for lead in total suspended particulate matter (Pb-TSP) which called for significant decreases in the allowable limits. The Federal Reference Method (FRM) for Pb-TSP promulgated in 1978 prescribes analysis of Pb by flame atomic absorption spectroscopy (FAAS), but the new limits approach the limits of quantitation of FAAS. On August 2, 2013, the USEPA finalized a new FRM for Pb-TSP. This new FRM describes two extraction methods and analysis by inductively coupled plasma-mass spectrometry (ICP-MS). The study described here was performed to evaluate the use of ICP-MS in the analysis of Pb-TSP for implementation of this new FRM. A multi-laboratory study of the new FRM demonstrated acceptable intra- and inter-laboratory precision and comparability for glass fiber, quartz, and PTFE filters, and acceptable accuracy for the analysis of three National Institute of Standards and Technology (NIST) Standard Reference Materials (SRMs). A comparison was made between analytical results obtained using the 1978 FRM and those obtained using the new FRM. The results demonstrate that the ICP-MS method performs acceptably for the determination of Pb-TSP with lower limits of quantitation and strong inter- and intra-laboratory precision.
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Affiliation(s)
- James M Harrington
- Trace Inorganics Department, Environmental and Industrial Sciences Division, RTI International, Research Triangle Park, 3040 E Cornwallis Rd., PO Box 12194, NC 27709, USA.
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40
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Mathews JM, Watson SL, Patel PR, Black SR, Hong Y, Levine KE, Ross G, Germolec DR, Thakur SA, Waidyanatha S. Metabolism and disposition of [(14)C]dimethylamine borane in male Harlan Sprague Dawley rats following gavage administration, intravenous administration and dermal application. Xenobiotica 2014; 44:36-47. [PMID: 23786350 DOI: 10.3109/00498254.2013.800662] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
1. Dimethylamine borane (DMAB) is used as a reducing agent in the manufacturing of a variety of products and in chemical synthesis. National Toxicology Program is evaluating the toxicity of DMAB in rodents following dermal application. The objective of this study was to evaluate the metabolism and disposition of DMAB in male Harlan Sprague Dawley (HSD) rats. 2. Disposition of radioactivity was similar between gavage and intravenous administration of 1.5 mg/kg [(14)C] DMAB, with nearly 84%-89% of the administered radioactivity recovered in urine 24 h post dosing. At 72 h, only 1% or less was recovered in feces, 0.3% as CO2, and 0.5%-1.4% as volatiles and 0.3%-0.4 % in tissues. 3. The absorption of [(14)C]DMAB following dermal application was moderate; percent dose absorbed increased with the dose, with 23%, 32% and 46% of dose absorbed at 0.15, 1.5 and 15 mg/kg, respectively. Urinary and fecal excretion ranged from 18%-37% and 2%-4% of dose, respectively, and 0.1%-0.2% as CO2, and 1%-3% as volatiles. Tissue retention of the radiolabel was low ∼1%, but was higher than following the gavage or intravenous administration. 4. Following co-adminsitration of DMAB and sodium nitrite by gavage, N-nitrosodimethylamine was not detected in blood or urine above the limit of quantitation of the analytical method of 10 ng/mL. 5. Absorption of DMAB in fresh human skin in vitro was ∼41% of the applied dose: the analysis of the receptor fluid shows that the intact DMAB complex can be absorbed through the skin.
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Affiliation(s)
- James M Mathews
- RTI International, Drug Metabolism and Pharmacokinetics , Research Triangle Park , USA , and
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41
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Kilibarda N, Afton SE, Harrington JM, Yan F, Levine KE. Rapid speciation and determination of vanadium compounds using ion-pair reversed-phase ultra-high-performance liquid chromatography inductively coupled plasma-sector field mass spectrometry. J Chromatogr A 2013; 1304:121-6. [PMID: 23871564 DOI: 10.1016/j.chroma.2013.06.074] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2013] [Revised: 06/18/2013] [Accepted: 06/28/2013] [Indexed: 11/15/2022]
Abstract
Environmental vanadium contamination is a potential concern to public health, as evidenced by its place on the U.S. Environmental Protection Agency Drinking Water Contaminant Candidate List as a priority contaminant. Vanadium toxicity varies significantly between different oxidation states; therefore, it is crucial to be able to monitor the speciation of vanadium in environmental samples. In this study, a novel method is described that utilizes ion-pair reversed-phase ultra-high-performance liquid chromatography with inductively coupled plasma-sector field mass spectrometry (IP-RP-UHPLC-ICP-SFMS) to separate vanadyl and vanadate ions and resolve a major polyatomic spectral interference ((35)Cl(16)O(+)) in less than a minute. Detection limits were obtained in the low ngL(-1) (part per trillion) range with linear calibrations across several orders of magnitude (50ngL(-1)-100μgL(-1)). The mechanism of chromatographic retention was elucidated through investigation of the role of ethylenediaminetetraacetic acid, tetrabutylammonium ion and pH on elution. The optimized method was then applied to the speciation of vanadium in local lake water samples.
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Affiliation(s)
- Nikola Kilibarda
- Department of Chemistry, North Carolina Central University, Durham, NC 27707, USA
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Kim NH, Mason CC, Nelson RG, Afton SE, Essader AS, Medlin JE, Levine KE, Hoppin JA, Lin C, Knowler WC, Sandler DP. Arsenic exposure and incidence of type 2 diabetes in Southwestern American Indians. Am J Epidemiol 2013; 177:962-9. [PMID: 23504692 DOI: 10.1093/aje/kws329] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Association of urinary arsenic concentration with incident diabetes was examined in American Indians from Arizona who have a high prevalence of type 2 diabetes and were screened for diabetes between 1982 and 2007. The population resides where drinking water contains arsenic at concentrations above federally recommended limits. A total of 150 nondiabetic subjects aged ≥25 years who subsequently developed type 2 diabetes were matched by year of examination and sex to 150 controls who remained nondiabetic for ≥10 years. Total urinary arsenic concentration, adjusted for urinary creatinine level, ranged from 6.6 µg/L to 123.1 µg/L, and inorganic arsenic concentration ranged from 0.1 µg/L to 36.0 µg/L. In logistic regression models adjusted for age, sex, body mass index, and urinary creatinine level, the odds ratios for incident diabetes were 1.11 (95% confidence interval (CI): 0.79, 1.57) and 1.16 (95% CI: 0.89, 1.53) for a 2-fold increase in total arsenic and inorganic arsenic, respectively. Categorical analyses suggested a positive relationship between quartiles of inorganic arsenic and incident diabetes (P = 0.056); post-hoc comparison of quartiles 2-4 with quartile 1 revealed 2-fold higher odds of diabetes in the upper quartiles (OR = 2.14, 95% CI: 1.19, 3.85). Modestly elevated exposure to inorganic arsenic may predict type 2 diabetes in American Indians. Larger studies that include measures of speciated arsenic are required for confirmation.
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Stewart JH, Shen P, Russell G, Fenstermaker J, McWilliams L, Coldrun FM, Levine KE, Jones BT, Levine EA. Erratum to: A Phase I Trial of Oxaliplatin for Intraperitoneal Hyperthermic Chemoperfusion for the Treatment of Peritoneal Surface Dissemination from Colorectal and Appendiceal Cancers. Ann Surg Oncol 2012. [DOI: 10.1245/s10434-012-2308-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Qiao X, Zeitany AE, Wright MW, Essader AS, Levine KE, Kucera GL, Bierbach U. Analysis of the DNA damage produced by a platinum-acridine antitumor agent and its effects in NCI-H460 lung cancer cells. Metallomics 2012; 4:645-52. [PMID: 22456976 DOI: 10.1039/c2mt20031g] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
High-performance liquid chromatography in conjunction with electrospray mass spectrometry (LC-ESMS) was used to structurally characterize the adducts formed by the platinum-acridine agent [PtCl(en)(N-(2-(acridin-9-ylamino)ethyl)-N-methylpropionimidamide)](NO(3))(2) (compound 1) in cell-free DNA. Compound 1 forms monofunctional adducts exclusively with guanine, based on the fragments identified in enzymatic digests (dG*, dGMP*, dApG*, and dTpG*, where the asterisk denotes bound drug). The time course of accumulation and DNA adduct formation of compound 1 and the clinical drug cisplatin in NCI-H460 lung cancer cells at physiologically relevant drug concentrations (0.1 μM) was studied by inductively-coupled plasma mass spectrometry (ICP-MS). Compound 1 accumulates rapidly in cells and reaches intracellular levels of up to 60-fold higher than those determined for cisplatin. The hybrid agent shows unusually high DNA binding levels: while cisplatin adducts form at a maximum frequency of 5 adducts per 10(6) nucleotides, compound 1 produces 25 adducts per 10(6) nucleotides after only 3 h of continuous incubation with the lung cancer cells. The high overall levels of compound 1 in the cells and in cellular DNA over the entire 12-h treatment period translate into a rapid decrease in cell viability. Possible implications of these findings for the mechanism of action of compound 1 and the agent's potential to overcome tumor resistance to cisplatin are discussed.
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Affiliation(s)
- Xin Qiao
- Department of Chemistry, Wake Forest University, Winston-Salem, North Carolina 27109, USA
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Collins BJ, Stout MD, Levine KE, Kissling GE, Melnick RL, Fennell TR, Walden R, Abdo K, Pritchard JB, Fernando RA, Burka LT, Hooth MJ. Exposure to hexavalent chromium resulted in significantly higher tissue chromium burden compared with trivalent chromium following similar oral doses to male F344/N rats and female B6C3F1 mice. Toxicol Sci 2010; 118:368-79. [PMID: 20843897 PMCID: PMC2984535 DOI: 10.1093/toxsci/kfq263] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2010] [Accepted: 08/26/2010] [Indexed: 11/13/2022] Open
Abstract
In National Toxicology Program 2-year studies, hexavalent chromium [Cr(VI)] administered in drinking water was clearly carcinogenic in male and female rats and mice, resulting in small intestine epithelial neoplasms in mice at a dose equivalent to or within an order of magnitude of human doses that could result from consumption of chromium-contaminated drinking water, assuming that dose scales by body weight(3/4) (body weight raised to the 3/4 power). In contrast, exposure to trivalent chromium [Cr(III)] at much higher concentrations may have been carcinogenic in male rats but was not carcinogenic in mice or female rats. As part of these studies, total chromium was measured in tissues and excreta of additional groups of male rats and female mice. These data were used to infer the uptake and distribution of Cr(VI) because Cr(VI) is reduced to Cr(III) in vivo, and no methods are available to speciate tissue chromium. Comparable external doses resulted in much higher tissue chromium concentrations following exposure to Cr(VI) compared with Cr(III), indicating that a portion of the Cr(VI) escaped gastric reduction and was distributed systemically. Linear or supralinear dose responses of total chromium in tissues were observed following exposure to Cr(VI), indicating that these exposures did not saturate gastric reduction capacity. When Cr(VI) exposure was normalized to ingested dose, chromium concentrations in the liver and glandular stomach were higher in mice, whereas kidney concentrations were higher in rats. In vitro studies demonstrated that Cr(VI), but not Cr(III), is a substrate of the sodium/sulfate cotransporter, providing a partial explanation for the greater absorption of Cr(VI).
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Affiliation(s)
- Bradley J. Collins
- National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
| | - Matthew D. Stout
- National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
| | - Keith E. Levine
- Discovery and Analytical Sciences, RTI International, Research Triangle Park, North Carolina 27709
| | - Grace E. Kissling
- National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
| | - Ronald L. Melnick
- National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
| | - Timothy R. Fennell
- Discovery and Analytical Sciences, RTI International, Research Triangle Park, North Carolina 27709
| | - Ramsey Walden
- Laboratory of Pharmacology, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
| | - Kamal Abdo
- National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
| | - John B. Pritchard
- Laboratory of Pharmacology, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
| | - Reshan A. Fernando
- Discovery and Analytical Sciences, RTI International, Research Triangle Park, North Carolina 27709
| | - Leo T. Burka
- National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
| | - Michelle J. Hooth
- National Toxicology Program, National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina 27709
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Levine KE, Stout MD, Ross GT, Essader AS, Weber FX, Grohse PM, Fernando RA, Milstein LS, Hooth MJ, Collins BJ. Validation and application of a method for the determination of total chromium in rat tissues by inductively coupled plasma mass spectrometry. Arch Environ Contam Toxicol 2010; 58:883-891. [PMID: 19798462 DOI: 10.1007/s00244-009-9397-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2009] [Accepted: 09/08/2009] [Indexed: 05/26/2023]
Abstract
The validation of a method for the determination of chromium (Cr) in F-344/N rat tissues by inductively coupled plasma-mass spectrometry is described. Samples were analyzed after a rapid, open-vessel microwave digestion procedure. Performance of the method was evaluated using kidney tissue across a concentration range of 0.50-5.00 microg Cr/g tissue. Data for method linearity, accuracy, precision, digest stability, and storage stability are presented along with limits of detection and quantitation data. Data from a method cross-validation for B6C3F1 mouse kidney tissue are also presented. After validation, the method was applied to analyze samples collected in support of two chronic toxicity and carcinogenesis studies conducted by the National Toxicology Program.
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Affiliation(s)
- Keith E Levine
- RTI International, Research Triangle Park, NC 27709, USA.
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Levine KE, Stout MD, Ross GT, Essader AS, Perlmutter JM, Grohse PM, Fernando RA, Lang M, Collins BJ. Validation of a Method for the Determination of Total Chromium in Rat Feces by Inductively Coupled Plasma Optical Emission Spectrometry. ANAL LETT 2009; 42:2729-2746. [PMID: 32494086 PMCID: PMC7269159 DOI: 10.1080/00032710902721931] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The validation of a method for the determination of total chromium in Fischer-344 rat feces by inductively coupled plasma optical emission spectrometry following a rapid, atmospheric-pressure microwave digestion is described. The performance of the method was evaluated over the concentration range of 5.00 to 200 μg Cr/g feces. Data for method linearity, accuracy, precision, digest stability, and storage stability are presented along with limit of detection and limit of quantitation data. Data from a cross-validation method for B6C3F1 mouse feces are also presented. Following validation, the method was applied to analyze samples collected in support of two chronic toxicological investigations.
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Affiliation(s)
- Keith E. Levine
- RTI International, Research Triangle Park, North Carolina, USA
| | - Matthew D. Stout
- National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
| | - Glenn T. Ross
- RTI International, Research Triangle Park, North Carolina, USA
| | - Amal S. Essader
- RTI International, Research Triangle Park, North Carolina, USA
| | | | - Peter M. Grohse
- RTI International, Research Triangle Park, North Carolina, USA
| | | | - Michelle Lang
- RTI International, Research Triangle Park, North Carolina, USA
| | - Bradley J. Collins
- National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, USA
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Karouna-Renier NK, Ranga Rao K, Lanza JJ, Rivers SD, Wilson PA, Hodges DK, Levine KE, Ross GT. Mercury levels and fish consumption practices in women of child-bearing age in the Florida Panhandle. Environ Res 2008; 108:320-326. [PMID: 18814872 DOI: 10.1016/j.envres.2008.08.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2007] [Revised: 05/15/2008] [Accepted: 08/07/2008] [Indexed: 05/26/2023]
Abstract
The southeastern United States, and in particular the coastal areas along the Gulf of Mexico (Gulf Coast) in Florida, experience some of the highest levels of mercury deposition in the country. Although the State of Florida's coastal border is among the longest in the United States, and the State has issued fish consumption advisories due to mercury on multiple fish species, few data have been systematically collected to assess mercury levels in the human population of the state or to assess the efficacy of the consumption advisories. Because of the generally high rate of seafood consumption among coastal populations, the human population in the Florida Panhandle, near Pensacola, FL is potentially exposed to elevated levels of mercury. In the present study, we analyzed hair mercury levels in women of child-bearing age (16-49 years) who had resided near Pensacola, FL for at least 1 year. We also surveyed the fish consumption practices of the cohort and evaluated awareness of the Florida Fish Consumption Advisory. Hair mercury levels were significantly higher in women who consumed fish within the 30 days prior to sampling (p<0.05) and in those women who were unaware of the consumption advisory (p<0.05). Only 31% of the women reported knowledge of the consumption advisory and pregnant women exhibited lower awareness of the advisory than non-pregnant women. The data suggest that public health interventions such as education and fish advisories have not reached the majority of women in the counties surrounding Pensacola who are most at risk from consumption of fish with high levels of mercury.
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Affiliation(s)
- Natalie K Karouna-Renier
- Center for Environmental Diagnostics and Bioremediation, University of West Florida, Pensacola, FL 32514, USA.
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Stewart JH, Shen P, Russell G, Fenstermaker J, McWilliams L, Coldrun FM, Levine KE, Jones BT, Levine EA. A phase I trial of oxaliplatin for intraperitoneal hyperthermic chemoperfusion for the treatment of peritoneal surface dissemination from colorectal and appendiceal cancers. Ann Surg Oncol 2008; 15:2137-45. [PMID: 18493824 DOI: 10.1245/s10434-008-9967-1] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2008] [Revised: 04/24/2008] [Accepted: 04/24/2008] [Indexed: 01/05/2023]
Abstract
BACKGROUND Cytoreductive surgery with intraperitoneal hyperthermic chemoperfusion (IPHC) has evolved into a promising approach for peritoneal surface malignancy. A large body of literature suggests that oxaliplatin has excellent cytotoxicity against colorectal cancer. Therefore, we undertook a phase I evaluation of IPHC with oxaliplatin for peritoneal dissemination from colorectal and appendiceal cancers to establish the dose-limiting toxicity (DLT) and the maximum tolerated dose (MTD). METHODS Cohorts of three patients underwent cytoreductive surgery followed by a 2-h IPHC with escalating doses of oxaliplatin at a target outflow temperature of 40 degrees C. The initial peritoneal oxaliplatin dose was 200 mg/M(2) with increases planned in 50 mg/M(2 )increments. Plasma and perfusate samples were collected during the IPHC and evaluated using emission spectrometry techniques. Normal tissue and tumor samples were collected before and after the IPHC for analysis. DLT was defined as a grade 3 toxicity lasting 5 days. RESULTS Fifteen patients were enrolled at two dose levels. Peritoneal fluid areas under the curve (AUCs) were above those of plasma. Additionally, intratumoral oxaliplatin was similar to that of surrounding normal tissue. Dose-limiting toxicities at 250 mg/M(2 )were observed in two of three patients enrolled in this study. CONCLUSION We found that IPHC with 200 mg/M(2 )of oxaliplatin is well tolerated and is the MTD for a 2-h chemoperfusion. Higher doses are not feasible with this perfusion protocol given the significant toxicities associated with 250 mg/M(2 )oxaliplatin. Based on the data from this phase I study, we propose to conduct further studies with oxaliplatin delivered at 200 mg/M(2).
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Affiliation(s)
- John H Stewart
- Department of General Surgery, Surgical Oncology Service, Medical Center Blvd, Wake Forest University School of Medicine, Winston-Salem, NC 27157, USA.
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Levine KE, Essader AS, Weber FX, Perlmutter JM, Milstein LS, Fernando RA, Levine MA, Collins BJ, Adams JB, Grohse PM. Determination of iodine in low mass human hair samples by inductively coupled plasma mass spectrometry. Bull Environ Contam Toxicol 2007; 79:401-4. [PMID: 17721731 DOI: 10.1007/s00128-007-9264-x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2007] [Accepted: 07/11/2007] [Indexed: 05/16/2023]
Affiliation(s)
- K E Levine
- RTI International, 3040 Cornwallis Road, P.O. Box 12194, Research Triangle Park, NC 27709, USA.
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