RESUMEN
Considering the toxicological effects of some heavy metals (HMs) in which directly related to mortality and carcinogenicity in the population by their entrance from plants through livestock grazing, and medical skin cream, the rehabilitation of contaminated sites through phytoremediation by native plants might be quite challenging. Diplotaenia damavandica Mozaff. ex-Hedge & Lamond, is used as medical skin creams due to the existence of specific ingredients, which can be effective in treating skin disease. In the present study, the plant and associated soil sampling were performed around the boundary of D. damavandica. The concentration was measured using the Inductively coupled plasma mass spectrometry (ICP-MS). The results revealed the effect of existing endemic plants on reducing the average concentration of lead and zinc in soil by 40 and 60%, respectively, due to phytoremediation. EDX confirmed the presence of Pb and Zn in root and shoot tissues. Based on the results of this study, D. damavandica is an endemic perennial herbaceous plant with 60% biomass and prosperous root systems, which can grow in low contaminated areas of Pb in the southeast of Damavand Mt. Hence, the HMs pattern indicated less often in the aerial parts except for lead, which should be examined more carefully for skin cream uses.
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Biodegradación Ambiental , Metales Pesados , Contaminantes del Suelo , Contaminantes del Suelo/análisis , Contaminantes del Suelo/toxicidad , Contaminantes del Suelo/metabolismo , Metales Pesados/análisis , Metales Pesados/metabolismo , Metales Pesados/toxicidad , Irán , Suelo/química , Plomo/toxicidad , Plomo/análisis , Plomo/metabolismo , Humanos , Zinc/análisis , Zinc/metabolismo , Zinc/toxicidad , Monitoreo del Ambiente/métodos , Raíces de Plantas/metabolismo , Raíces de Plantas/químicaRESUMEN
INTRODUCTION: Every year, children are poisoned with lead with irreversible effects. This exposure most often occurs in older housing built before 1978 with chipping paint from windowsills where children play and ingest the lead particulates. Exposure to lead can cause neurological and psychological dysfunction, among other health issues. OBJECTIVE: This quality improvement study aims to evaluate our knowledge of at-risk children through a public health approach by analyzing the current public health data and possible barriers to lead screening, testing follow-up, and identifying at-risk children. METHODS: We received data on lead-poisoned children and inspected properties from the City of Milwaukee Health Department. We analyzed each child's initial blood lead level, as well as follow-up tests recorded, ZIP code of residence, and family renter versus home ownership. RESULTS: Over 90% of children in the database had recorded follow-up blood lead testing following an initial elevated blood lead level. There was no difference in initial recorded blood lead levels between children with recorded follow-up blood lead levels and children without (21.40, SD = 11.26); t[1.17], P = 0.24). Most affected children were from economically disadvantaged ZIP codes (53206, 53208, 53215), and 94% lived in rented properties. CONCLUSIONS: Over 90% of children in the database had recorded follow-up blood lead testing following an initial elevated blood lead level. There was no difference in initial recorded blood lead levels between children with recorded follow-up blood lead levels and children without (21.40, SD = 11.26); t[1.17], P = 0.24). Most affected children were from economically disadvantaged ZIP codes (53206, 53208, 53215), and 94% lived in rented properties.
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Intoxicación por Plomo , Humanos , Intoxicación por Plomo/epidemiología , Wisconsin/epidemiología , Masculino , Femenino , Preescolar , Niño , Exposición a Riesgos Ambientales/efectos adversos , Mejoramiento de la Calidad , Lactante , Salud Pública , Factores de Riesgo , Plomo/sangreRESUMEN
Background: Exposure to environmental metals has been increasingly associated with systemic inflammation, which is implicated in the pathogenesis of various chronic diseases, including those with neurodegenerative aspects. However, the complexity of exposure and response relationships, particularly for mixtures of metals, has not been fully elucidated. Objective: This study aims to assess the individual and combined effects of lead, cadmium, and mercury exposure on systemic inflammation as measured by C-reactive protein (CRP) levels, using data from the National Health and Nutrition Examination Survey (NHANES) 2017-2018. Methods: We employed Bayesian Kernel Machine Regression (BKMR) to analyze the NHANES 2017-2018 data, allowing for the evaluation of non-linear exposure-response functions and interactions between metals. Posterior Inclusion Probabilities (PIP) were calculated to determine the significance of each metal's contribution to CRP levels. Results: The PIP results highlighted mercury's significant contribution to CRP levels (PIP = 1.000), followed by cadmium (PIP = 0.6456) and lead (PIP = 0.3528). Group PIP values confirmed the importance of considering the metals as a collective group in relation to CRP levels. Our BKMR analysis revealed non-linear relationships between metal exposures and CRP levels. Univariate analysis showed a flat relationship between lead and CRP, with cadmium having a positive relationship. Mercury exhibited a U-shaped association, indicating both low and high exposures as potential risk factors for increased inflammation. Bivariate analysis confirmed this relationship when contaminants were combined with lead and cadmium. Analysis of single-variable effects suggested that cadmium and lead are associated with higher values of the h function, a flexible function that takes multiple metals and combines them in a way that captures the complex and potentially nonlinear relationship between the metals and CRP. The overall exposure effect of all metals on CRP revealed that exposures below the 50th percentile exposure level are associated with an increase in CRP levels, while exposures above the 60th percentile are linked to a decrease in CRP levels. Conclusions: Our findings suggest that exposure to environmental metals, particularly mercury, is associated with systemic inflammation. These results highlight the need for public health strategies that address the cumulative effects of metal exposure and reinforce the importance of using advanced statistical methods to understand the health impact of environmental contaminants. Future research should focus on the mechanistic pathways of metal-induced inflammation and longitudinal studies to ascertain the long-term effects of these exposures.
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Proteína C-Reactiva , Cadmio , Exposición a Riesgos Ambientales , Inflamación , Plomo , Mercurio , Encuestas Nutricionales , Humanos , Plomo/sangre , Proteína C-Reactiva/metabolismo , Proteína C-Reactiva/análisis , Femenino , Masculino , Exposición a Riesgos Ambientales/efectos adversos , Adulto , Persona de Mediana Edad , Teorema de Bayes , Contaminantes Ambientales/toxicidadRESUMEN
BACKGROUND: Exposure to lead during childhood is detrimental to children's health. The extent to which the association between lead exposure and elementary school academic outcomes varies across geography is not known. OBJECTIVE: Estimate associations between blood lead levels (BLLs) and fourth grade standardized test scores in reading and mathematics in North Carolina using models that allow associations between BLL and test scores to vary spatially across communities. METHODS: We link geocoded, individual-level, standardized test score data for North Carolina public school students in fourth grade (2013-2016) with detailed birth records and blood lead testing data retrieved from the North Carolina childhood blood lead state registry on samples typically collected at 1-6 y of age. BLLs were categorized as: 1µg/dL (reference), 2µg/dL, 3-4µg/dL and ≥5µg/dL. We then fit spatially varying coefficient models that incorporate information sharing (smoothness), across neighboring communities via a Gaussian Markov random field to provide a global estimate of the association between BLL and test scores, as well as census tract-specific estimates (i.e., spatial coefficients). Models adjusted for maternal- and child-level covariates and were fit separately for reading and math. RESULTS: The average BLL across the 91,706 individuals in the analysis dataset was 2.84µg/dL. Individuals were distributed across 2,002 (out of 2,195) census tracts in North Carolina. In models adjusting for child sex, birth weight percentile for gestational age, and Medicaid participation as well as maternal race/ethnicity, educational attainment, marital status, and tobacco use, BLLs of 2µg/dL, 3-4µg/dL and ≥5µg/dL were associated with overall lower reading test scores of -0.28 [95% confidence interval (CI): -0.43, -0.12], -0.53 (-0.69, -0.38), and -0.79 (-0.99, -0.604), respectively. For BLLs of 1µg/dL, 2µg/dL, 3-4µg/dL and ≥5µg/dL, spatial coefficients-that is, tract-specific adjustments in reading test score relative to the "global" coefficient-ranged from -9.70 to 2.52, -3.19 to 3.90, -11.14 to 7.85, and -4.73 to 4.33, respectively. Results for mathematics were similar to those for reading. CONCLUSION: The association between lead exposure and reading and mathematics test scores exhibits considerable heterogeneity across North Carolina communities. These results emphasize the need for prevention and mitigation efforts with respect to lead exposures everywhere, with special attention to locations where the cognitive impact is elevated. https://doi.org/10.1289/EHP13898.
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Exposición a Riesgos Ambientales , Plomo , Instituciones Académicas , Estudiantes , Humanos , North Carolina , Niño , Plomo/sangre , Femenino , Masculino , Exposición a Riesgos Ambientales/estadística & datos numéricos , Estudiantes/estadística & datos numéricos , Contaminantes Ambientales/sangre , Lectura , Preescolar , MatemáticaRESUMEN
Although the hierarchical manganese dioxide film electrode shows promise as a durable and catalytically active anode for zinc electrowinning, it often fails and deactivates when it is exposed to fluoride-rich environments. The lack of understanding regarding the mechanism behind fluoride-induced irreversible interface reconstruction hinders their practical application in large-scale energy-saving and pollution-reduction efforts. Here, we conducted multidimensional operando investigations to gain insights into the dynamic evolution across the film electrode interface with temporal and spatial resolution. Our findings reveal that electroosmosis of F- initially triggers structural collapse and subsequent reconstruction of [MnO6] units, followed by interaction with the spontaneous oxide film at the surface of lead substrate. Experimental studies and theoretical calculations indicate that F- facilitates the irreversible transformation of γ-MnO2 into more stable yet protective catalytic dual-defective α-MnO2. Additionally, lower levels of F- at the interface promote a change in microenvironmental pH within porous PbSO4, triggering the development of microporous corrosion-resistant ß-PbO2 as the dominant phase. The combined effects of MnO2 and interphase evolution effectively explain the abnormally elevated oxygen evolution overpotential. Then, the proposed appropriate application scenarios based on the corrosion behavior will serve as a practical guide for the implementation of the hierarchical manganese dioxide film electrode.
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Electrodos , Fluoruros , Plomo , Zinc , Fluoruros/química , Zinc/química , Óxidos/química , Compuestos de Manganeso/químicaRESUMEN
The reaction of dissolved Pb2+ with calcite surfaces at near-equilibrium conditions involves adsorption of Pb2+ and precipitation of secondary heteroepitaxial Pb-carbonate minerals. A more complex behavior is observed under far-from-equilibrium conditions, including strong inhibition of calcite dissolution, development of microtopography, and near-surface incorporation of multiple monolayers (ML) of Pb2+ without precipitation of secondary phases [where 1 ML ≡ 1 Ca/20.2 Å2, the crystallographic site density of the calcite (104) lattice plane]. However, the mechanistic controls governing far-from-equilibrium reactivity are not well understood. Here, we observe the interfacial incorporation of dissolved Pb2+ during the dissolution of calcite (104) surfaces at pH â¼ 3.7 in a flow-through reaction cell, revealing the formation of a â¼1 nm thick Pb-rich calcite layer with a total Pb coverage of â¼1.4 ML. These observations of the sorbed Pb distribution used resonant anomalous X-ray reflectivity, X-ray fluorescence, and nanoinfrared atomic force microscopy. We propose that this altered surface layer represents a novel sorption mode that is stabilized by conditions of sustained disequilibrium. This behavior may significantly impact the transport of dissolved metals during disequilibrium processes occurring in acid mine drainage and subsurface CO2 injection and, if appropriately accounted for, could improve the predictive capability of geochemical reactive-transport models.
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Carbonato de Calcio , Plomo , Plomo/química , Carbonato de Calcio/química , Adsorción , Propiedades de Superficie , IonesRESUMEN
The heavy metal lead (Pb) pollution in marine environment has been widely concerned. The liver and intestine are important for the health of fish. In this study, the grouper were exposed to 1 µg/L Pb for 14 days, and the physiological homeostasis changes were explored via gut-liver axis. The results showed that Pb stress caused liver morphological changes, oxidative stress, and the accumulation and peroxidation of the lipids. The liver metabolism were disturbed, especially amino acid metabolism and the synthesis and degradation of ketone bodies. Pb stress also caused intestinal mucosal ablation, tight junction dysfunction and inflammatory response. Additionally, intestinal microbial diversity was decreased, and the community composition was altered especially several bacteria genera (Ruminococcus UCG-005, Ruminococcus UCG-014, Oscillibacter, and Streptococcus) were significantly correlated with the physiological indexes and metabolites of the liver. These results reveal that Pb stress negatively affect the physiological homeostasis of the grouper via gut-liver axis.
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Microbioma Gastrointestinal , Homeostasis , Plomo , Hígado , Contaminantes Químicos del Agua , Animales , Plomo/toxicidad , Hígado/efectos de los fármacos , Contaminantes Químicos del Agua/toxicidad , Microbioma Gastrointestinal/efectos de los fármacos , Estrés Oxidativo , Lubina/fisiologíaRESUMEN
KEY MESSAGE: Cd induces photosynthetic inhibition and oxidative stress damage in H. citrina, which mobilizes the antioxidant system and regulates the expression of corresponding genes to adapt to Cd and Pb stress. Cd and Pb are heavy metals that cause severe pollution and are highly hazardous to organisms. Physiological measurements and transcriptomic analysis were combined to investigate the effect of 5 mM Cd or Pb on Hemerocallis citrina Baroni. Cd significantly inhibited H. citrina growth, while Pb had a minimal impact. Both Cd and Pb suppressed the expression levels of key chlorophyll synthesis genes, resulting in decreased chlorophyll content. At the same time, Cd accelerated chlorophyll degradation. It reduced the maximum photochemical efficiency of photosystem (PS) II, damaging the oxygen-evolving complex and leading to thylakoid dissociation. In contrast, no such phenomena were observed under Pb stress. Cd also inhibited the Calvin cycle by down-regulating the expression of Rubisco and SBPase genes, ultimately disrupting the photosynthetic process. Cd impacted the light reaction processes by damaging the antenna proteins, PS II and PS I activities, and electron transfer rate, while the impact of Pb was weaker. Cd significantly increased reactive oxygen species and malondialdehyde accumulation, and inhibited the activities of antioxidant enzymes and the expression levels of the corresponding genes. However, H. citrina adapted to Pb stress by the recruitment of antioxidant enzymes and the up-regulation of their corresponding genes. In summary, Cd and Pb inhibited chlorophyll synthesis and hindered the light capture and electron transfer processes, with Cd exerting great toxicity than Pb. These results elucidate the physiological and molecular mechanisms by which H. citrina responds to Cd and Pb stress and provide a solid basis for the potential utilization of H. citrina in the greening of heavy metal-polluted lands.
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Antioxidantes , Cadmio , Clorofila , Regulación de la Expresión Génica de las Plantas , Plomo , Fotosíntesis , Fotosíntesis/efectos de los fármacos , Cadmio/toxicidad , Plomo/toxicidad , Antioxidantes/metabolismo , Regulación de la Expresión Génica de las Plantas/efectos de los fármacos , Clorofila/metabolismo , Perfilación de la Expresión Génica , Estrés Oxidativo/efectos de los fármacos , Especies Reactivas de Oxígeno/metabolismo , Complejo de Proteína del Fotosistema II/metabolismo , Transcriptoma/efectos de los fármacos , Amaranthaceae/efectos de los fármacos , Amaranthaceae/genética , Amaranthaceae/fisiología , Complejo de Proteína del Fotosistema I/metabolismo , Malondialdehído/metabolismoRESUMEN
Lead is one of the major environmental pollutants which is highly toxic to plants and living beings. The current investigation thoroughly evaluated the synergistic effects of oxalic acid (OA) and salicylic acid (SA) on Zea mays L. plants subjected to varying durations (15, 30, 30, and 45 days) of lead (Pb) stress. Besides, the effects of oxalic acid (OA) combined with salicylic acid (SA) for different amino acids at various periods of Pb stress were also investigated on Zea mays L. The soil was treated with lead nitrate Pb (NO3)2 (0.5 mM) to induce Pb stress while the stressed plants were further treated using oxalic acid (25 mg/L), salicylic acid (25 mg/L), and their combination OA + SA (25 mg/L each). Measurements of protein content, malondialdehyde (MDA) levels, guaiacol peroxidase (GPOX) activity, catalase (CAT) activity, GSH content, and Pb concentration in maize leaves were done during this study. MDA levels increased by 71% under Pb stress, while protein content decreased by 56%, GSH content by 35%, and CAT activity by 46%. After treatment with SA, OA, and OA+SA, there was a significant reversal of these damages, with the OA+SA combination showing the highest improvement. Specifically, OA+SA treatment led to a 45% increase in protein content and a 39% reduction in MDA levels compared to Pb treatment alone. Moreover, amino acid concentrations increased by 68% under the Pb+OA+SA treatment, reflecting the most significant recovery (p < 0.0001).
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Aminoácidos , Plomo , Malondialdehído , Ácido Oxálico , Ácido Salicílico , Estrés Fisiológico , Zea mays , Zea mays/efectos de los fármacos , Zea mays/metabolismo , Plomo/toxicidad , Ácido Oxálico/metabolismo , Ácido Oxálico/farmacología , Ácido Salicílico/farmacología , Aminoácidos/metabolismo , Malondialdehído/metabolismo , Estrés Fisiológico/efectos de los fármacos , Catalasa/metabolismo , Peroxidasa/metabolismo , Glutatión/metabolismo , Hojas de la Planta/efectos de los fármacos , Hojas de la Planta/metabolismo , Sinergismo Farmacológico , Proteínas de Plantas/metabolismoRESUMEN
The Virginia opossum (Didelphis virginiana) is the only marsupial in North America with a natural range north of Mexico. Its range is widespread throughout the United States, including Illinois. Virginia opossums are opportunistic omnivores that will eat a variety of fruits, grains, insects, and even carrion. They are a ground-foraging species, with frequent soil contact allowing for potential exposure to heavy metal contaminants in terrestrial environments. They are also opportunists that thrive in human-altered ecosystems, including peri-urban environments. Lead is a naturally occurring element and highly toxic metal that is abundant in the soil, primarily due to anthropogenic factors such as fossil fuel use, paint, industrial production waste, and battery recycling. Furthermore, carrion and offal piles containing lead bullet fragments remaining from hunting result in environmental contamination of this heavy metal. Few studies exist on lead exposure in the Virginia opossum. This pilot study evaluates the blood lead burden of 16 free-ranging Virginia opossums presented to a wildlife rehabilitation facility, compared with 16 wild-caught Virginia opossums trapped in grassland, maintained forest, or mixed ecotones. In other species, lead toxicosis has been associated with cognitive dysfunction that may increase the likelihood of trauma or injury in a free-ranging setting. In addition, a high incidence of Virginia opossums presenting for wildlife rehabilitation do so as result of human-animal conflict. Therefore, it was anticipated that individuals presenting for wildlife rehabilitation would have significantly higher blood lead concentrations than their free-roaming counterparts. In this study, every Virginia opossum had measurable blood lead concentrations and the average blood lead concentration of the rehabilitated group was 2.7 times higher than that measured in wild-caught Virginia opossums. These results suggest that Virginia opossums are exposed and susceptible to lead toxicosis due to their diet and foraging behaviors, making them more prone to subsequent injury and presentation to wildlife rehabilitation centers.
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Didelphis , Plomo , Animales , Plomo/sangre , Illinois , Didelphis/sangre , Femenino , Masculino , Animales Salvajes , Proyectos PilotoRESUMEN
The removal of pollutants, including heavy metals, from the aquatic environment is an urgent problem worldwide. Actively developing nanotechnology areas is becoming increasingly important for solving problems in the field of the remediation of aquatic ecosystems. In particular, methods for removing pollutants using nanoparticles (NPs) are proposed, which raises the question of the effect of a combination of NPs and heavy metals on living organisms. In this work, we investigated the role of CuO-NPs in changing the toxicity of Cd and Pb salts, as well as the bioaccumulation of these elements in a culture of the microalga Desmodesmus communis. It was found that CuO-NPs at concentrations of 10, 100, and 1000 µg L-1 had no effect on the viability of microalgae cells. On the 14th day of the experiment, Cd at a concentration of 1 mg L-1 reduced the viability index by 30% and, when combined with CuO-NPs, by 25%, i.e., CuO-NPs slightly reduced the toxic effect of Cd. At the same time, in this experiment, when CuO-NPs and Cd were used together, the level of oxidative stress increased, including on the first day in mixtures with 1 mg L-1 Cd. Under the influence of Pb, the cell viability index decreased by 70% by the end of the experiment, regardless of the metal concentration. The presence of CuO-NPs slightly reduced the toxicity of Pb in terms of viability and reactive oxygen species (ROS). At the same time, unlike Cd, Pb without NPs caused ROS production on the first day, whereas the addition of CuO-NPs completely detoxified Pb at the beginning and had a dose-dependent effect on mixtures at the end of the experiment. Also, the introduction of CuO-NPs slightly reduced the negative effect of Pb on pigment synthesis. As a molecular mechanism of the observed effects, we prioritized the provocation of oxidative stress by nanoparticles and related gene expression and biochemical reactions of algae cells. Analysis of the effect of CuO-NPs on the Cd and Pb content in microalgae cells showed increased accumulation of heavy metals. Thus, when algae were cultured in an environment with Cd and CuO-NPs, the Cd content per cell increased 4.2 times compared to the variant where cells were cultured only with Cd. In the case of Pb, the increase in its content per one cell increased 6.2 times when microalgae were cultured in an environment containing CuO-NPs. Thus, we found that CuO-NPs reduce the toxic effects of Cd and Pb, as well as significantly enhance the bioaccumulation of these toxic elements in the cells of D. communis microalgae. The results obtained can form the basis of technology for the nanobioremediation of aquatic ecosystems from heavy metals using microalgae.
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Cadmio , Cobre , Plomo , Nanopartículas del Metal , Microalgas , Estrés Oxidativo , Plomo/toxicidad , Plomo/metabolismo , Cobre/metabolismo , Cadmio/toxicidad , Cadmio/metabolismo , Microalgas/metabolismo , Microalgas/efectos de los fármacos , Nanopartículas del Metal/química , Estrés Oxidativo/efectos de los fármacos , Bioacumulación , Contaminantes Químicos del Agua/toxicidad , Especies Reactivas de Oxígeno/metabolismoRESUMEN
This study investigates the phytoremediation potential of non-productive seedlings of Ailanthus altissima, Acer pseudoplatanus, and Fraxinus excelsior for lead, cadmium, and zinc accumulation in contaminated soils of Zanjan Province, an industrial area with significant pollution. The evaluation employed a completely randomized design, with three treatment levels for each element, alongside a control treatment, replicated three times over a two-year period. A total of 810 one-year-old seedlings from the three species were involved in the study. Soil contamination levels, ranging from 0 to 2000 mg/kg for lead and zinc and from 0 to 200 mg/kg for cadmium, were administered through soil pot irrigation. Sampling of seedling stems and pot soils was conducted in November of 2021 and 2022. The absorption levels of elements in the samples were determined using the dry acid digestion method and an ICP-OES atomic absorption spectrometer. Results indicate species-specific variations in metal absorption, with Ailanthus showing the highest accumulation rates. Findings suggest Ailanthus as a promising candidate for soil improvement in polluted environments, particularly in contaminated soils of Zanjan Province.
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Acer , Ailanthus , Biodegradación Ambiental , Fraxinus , Metales Pesados , Plantones , Contaminantes del Suelo , Contaminantes del Suelo/metabolismo , Contaminantes del Suelo/análisis , Fraxinus/metabolismo , Ailanthus/metabolismo , Metales Pesados/metabolismo , Metales Pesados/análisis , Acer/metabolismo , Plantones/metabolismo , Suelo/química , Zinc/metabolismo , Zinc/análisis , Cadmio/metabolismo , Cadmio/análisis , Plomo/metabolismo , Plomo/análisisRESUMEN
BACKGROUND: Neurodevelopmental performance tasks are often separately analyzed, even when they tap into a similar construct. This may yield mixed findings for associations of an exposure-neurobehavioral outcome. We develop an item response theory (IRT) approach to integrate multiple task variables together to improve measurement precision of the underlying construct. We apply this approach to create an integrative measure of childhood inhibitory control, and study impacts of pre/post-natal lead exposure. METHODS: Using data from a prospective cohort based in Mexico (N = 533), we created an inhibitory control scale that integrates accuracy and reaction time information from four inhibitory control tasks (Go/NoGo Letter, Go/NoGo Neutral, Go/NoGo Happy, Delis-Kaplan Executive Function System (D-KEFS) Color-Word Interference Test, Condition 3). Using a generalized partial credit item response theory model, we estimated an inhibitory control index for each participant. We then assessed adjusted associations between umbilical cord blood and 4-year lead and childhood inhibitory control. We developed a resampling approach to incorporate error estimates from the inhibitory control variable to confirm the consistency of the lead-inhibitory control associations. We modeled time-varying associations of lead with each inhibitory control measure separately. RESULTS: Participants had a median age of 9 years; 51.4% were males. Umbilical cord blood [-0.06 (95% CI: -0.11, -0.01)] and 4-year lead [-0.07 (95% CI: -0.12, -0.02)] were associated with inhibitory control index at 8-10 years. A resampling approach confirmed that 4-year lead was consistently associated with childhood inhibitory control index. Umbilical cord blood and 4-year lead were each associated with 3 out of 8 measures in separate models. CONCLUSION: This is the first application of IRT in environmental epidemiology to create a latent variable for inhibitory control that integrates accuracy and reaction time information from multiple, related tasks. This framework can be applied to other correlated neurobehavioral assessments or other phenotype data.
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Función Ejecutiva , Inhibición Psicológica , Plomo , Humanos , Plomo/sangre , Masculino , Femenino , México , Preescolar , Embarazo , Efectos Tardíos de la Exposición Prenatal , Contaminantes Ambientales/sangre , Estudios Prospectivos , Niño , Exposición a Riesgos Ambientales/análisisRESUMEN
Lead and cadmium are heavy metals widely distributed in the environment and contribute significantly to cardiovascular morbidity and mortality. Using Leadmium Green dye, we have shown that lead and cadmium enter cardiomyocytes, distributing throughout the cell. Using an in vitro motility assay, we have shown that sliding velocity of actin and native thin filaments over myosin decreases with increasing concentrations of Pb2+ and Cd2+. Significantly lower concentrations of Pb2+ and Cd2+ (0.6 mM) were required to stop sliding of thin filaments over myosin compared to the stopping actin sliding over the same myosin (1.1-1.6 mM). Lower concentration of Cd2+ (1.1 mM) needed to stop actin sliding over myosin compared to the Pb2++Cd2+ combination (1.3 mM) and lead alone (1.6 mM). There were no differences found in the effects of lead and cadmium cations on relative force developed by myosin heads or number of actin filaments bound to myosin. Sliding velocity of actin over myosin in the left atrium, right and left ventricles changed equally when exposed to the same dose of the same metal. Thus, we have demonstrated for the first time that Pb2+ and Cd2+ can directly affect myosin and thin filament function, with Cd2+ exerting a more toxic influence on myosin function compared to Pb2+.
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Citoesqueleto de Actina , Cadmio , Cationes Bivalentes , Plomo , Cadmio/farmacología , Animales , Citoesqueleto de Actina/metabolismo , Citoesqueleto de Actina/efectos de los fármacos , Miosinas Cardíacas/metabolismo , Miocitos Cardíacos/efectos de los fármacos , Miocitos Cardíacos/metabolismo , Actinas/metabolismo , ConejosRESUMEN
Lead (Pb) is an environmentally widespread bone toxic pollutant, contributes to the development of osteoporosis. Butyric acid, mainly produced by the fermentation of indigestible dietary fiber by gut microbiota, plays a pivotal role in the maintenance of bone homeostasis. However, the effects of butyric acids on the Pb induced osteoporosis have not yet been elucidated. In this study, our results showed that Pb exposure was negatively related to the abundance of butyric acid, in the Pb-exposed population and Pb-exposed mice. Pb exposure caused gut microbiota disorders, resulting in the decline of butyric acid-producing bacteria, such as Butyrivibrio_crossotus, Clostridium_sp._JN9, and the butyrate-producing enzymes through the acetyl-CoA pathway. Moreover, results from the NHANES data suggested that dietary intake of butyrate was associated with a reduced risk of osteoporosis in lead-burdened populations, particularly among men or participants aged 18-60 years. In addition, butyrate supplementation in mice with chronic Pb exposure improved the bone microarchitectures, repaired intestinal damage, upregulated the proportion of Treg cells. Taken together, these results demonstrated that chronic Pb exposure disturbs the gut-bone axis, which can be restored by butyric acid supplement. Our results suggest that butyrate supplementation is a possible therapeutic strategy for lead-induced bone toxicity.
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Butiratos , Microbioma Gastrointestinal , Plomo , Osteoporosis , Animales , Microbioma Gastrointestinal/efectos de los fármacos , Osteoporosis/inducido químicamente , Ratones , Plomo/toxicidad , Masculino , Femenino , Butiratos/farmacología , Ácido Butírico/farmacología , Humanos , Adulto , Huesos/efectos de los fármacos , Persona de Mediana Edad , Adulto Joven , Adolescente , Ratones Endogámicos C57BLRESUMEN
BACKGROUND: Previous studies reported that lead (Pb) exposure induced adverse health effects at high exposure concentrations, however, there have been limited data on sensitivity comparisons among different health outcomes at low blood Pb levels. OBJECTIVES: To compare sensitivity between blood parameters and a genotoxic biomarker among workers exposed to low blood Pb levels (< 20⯵g/dl), and to estimate a benchmark dose (BMD). METHODS: Pb-exposed workers were recruited from a lead-acid storage battery plant. Their blood lead levels (BLLs) were measured. Blood parameters and micronuclei (MN) frequencies were determined. Multivariate linear or Poisson regression was used to analyze relationships between blood parameters or MN frequencies with BLLs. Two BMD software were used to calculate BMD and its 95â¯% lower confidence limit (BMDL) for BLLs. RESULTS: The median BLL for 611 workers was 10.44⯵g/dl with the 25th and 75th percentile being 7.37 and 14.62⯵g/dl among all participants. There were significantly negative correlations between blood parameters and BLLs. However, MN frequencies correlated positively with BLLs (all P<0.05). Results from the two BMD software revealed that the dichotomous model was superior to the continuous model, and the BMDL for BLL derived from red blood cell (RBC) was 15.11⯵g/dl, from hemoglobin (HGB) was 8.50⯵g/dl, from mean corpuscular hemoglobin (MCH) was 7.87⯵g/dl, from mean corpuscular hemoglobin concentration (MCHC) was 3.98⯵g/dl, from mean corpuscular volume (MCV) was 11.44⯵g/dl, and from hematocrit (HCT) was 6.65⯵g/dl. The conservative BMDL obtained from the MN data was 7.52⯵g/dl. CONCLUSION: Our study shows that low dose Pb exposure caused decrease of blood parameters and increase of MN frequencies. The genotoxic biomarker was more sensitive than most blood parameters. BMDLs for BLL derived from MN frequencies and the red blood cell indicators should be considered as new occupational exposure limits. Our results suggest that MN assay can be considered as a part of occupational health examination items.
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Biomarcadores , Plomo , Pruebas de Micronúcleos , Exposición Profesional , Humanos , Plomo/sangre , Plomo/toxicidad , Exposición Profesional/efectos adversos , Masculino , Adulto , Biomarcadores/sangre , Femenino , Persona de Mediana Edad , Adulto Joven , Hemoglobinas/análisisRESUMEN
The cultivation of forage crops on wastewater-irrigated soils, while common in many developing countries, poses significant risks due to heavy metal pollution, particularly Lead (Pb) and Nickel (Ni). This practice, aimed at addressing water scarcity challenges and providing affordable irrigation, was investigated for its ecological and human health implications across three diverse sites (site A, site B, and site C). Our study unveiled increases in Pb concentrations in contaminated soil, cultivated with Sesbania bispinosa showing the highest Pb accumulation. The Ni concentrations ranged from 5.34 to 10.43 across all forage crop samples, with S. fruticosa from site C displaying the highest Ni concentration and S. bicolor from site A exhibiting the lowest. Trace element concentrations in the specimens were determined using an atomic absorption spectrophotometer. The Pb levels in the blood, hair, and feces of farm ruminants (cows, buffaloes, and sheep) varied across the sites, with buffaloes consistently displaying the highest Pb levels. Insights into daily Pb intake by ruminant's highlighted variations influenced by plant species, animal types, and sites, with site C, the cows exhibiting the highest Health Risk Index (HRI) associated with lead exposure from consuming forage crops. Soil and forage samples showed Pb concentrations ranging from 8.003 to 12.29â¯mg/kg and 6.69-10.52â¯mg/kg, respectively, emphasizing the severe health risks associated with continuous sewage usage. Variations in Ni concentrations across animal blood, hair, and feces samples underscored the importance of monitoring Ni exposure in livestock, with sheep at site B consistently showing the highest Ni levels. These findings highlight the necessity of vigilance in monitoring trace element (Pb and Ni) exposure in forage crops and livestock, to mitigate potential health risks associated with their consumption, with variations dependent on species, site, and trace element concentrations.
Asunto(s)
Productos Agrícolas , Plomo , Níquel , Contaminantes del Suelo , Níquel/análisis , Níquel/toxicidad , Animales , Contaminantes del Suelo/análisis , Plomo/análisis , Monitoreo del Ambiente , Rumiantes , Ovinos , Bovinos , Suelo/química , GranjasRESUMEN
Contamination of the environment with toxic metals such as cadmium or lead is a worldwide issue. The accumulator of metals Cannabis sativa L. has potential to be utilized in phytoremediation, which is an environmentally friendly way of soil decontamination. Novel non-thermal plasma-based technologies may be a helpful tool in this process. Plasma activated water (PAW), prepared by contact of gaseous plasma with water, contains reactive oxygen and nitrogen species, which enhance the growth of plants. In this study, C. sativa was grown in a short-term toxicity test in a medium which consisted of plasma activated water prepared by dielectric barrier discharge with liquid electrode and different concentrations of cadmium or lead. Application of PAW on heavy metal contaminated C. sativa resulted in increased growth under Pb contamination as was determined by ecotoxicology tests. Furthermore, the PAW influence on the bioaccumulation of these metals as well as the influence on the nutrient composition of plants was studied primarily by applying Laser-induced breakdown spectroscopy (LIBS). The LIBS elemental maps show that C. sativa accumulates heavy metals mainly in the roots. The results present a new proof-of-concept in which PAW could be used to improve the growth of plants in heavy metal contaminated environment, while LIBS can be implemented to study the phytoremediation efficiency.
Asunto(s)
Bioacumulación , Biodegradación Ambiental , Cadmio , Cannabis , Rayos Láser , Plomo , Metales Pesados , Contaminantes del Suelo , Cadmio/toxicidad , Cadmio/metabolismo , Plomo/metabolismo , Plomo/toxicidad , Contaminantes del Suelo/toxicidad , Contaminantes del Suelo/metabolismo , Cannabis/metabolismo , Análisis Espectral/métodos , Agua/química , Gases em Plasma , Raíces de Plantas/metabolismoRESUMEN
Non-invasive proxies, such as fur and feathers, are likely to be increasingly used to assess the potential exposure of chemicals, including trace metals and metalloids. However, the amount of external contamination is usually unknown, and there is no standard method for removing external contamination of trace metals in fur or feathers. To date, 40â¯% of studies published related to the measurement of trace metal levels in fur or the hair of non-human mammals and 24â¯% of studies in feathers do not state any washing methods or did not wash the samples before analysis. We assessed three washing techniques to remove external contamination of arsenic (As), lead (Pb), and zinc (Zn) from bat fur. We selected the three most frequently used fur washing methods from literature. To test these methods, fur samples from great flying foxes (Pteropus neohibernicus neohibernicus, n=15 individuals) from Papua New Guinea preserved over eight decades (AMNH, USA) were used. Percentages of trace metal removed are 87.19â¯% (SD= 12.28), 92.99â¯% (SD= 5.5) and 88.57â¯% (SD= 9.33) for As, 54.72â¯% (SD= 31.64), 55.89â¯% (SD= 37.87), and 53.93â¯% (SD= 41.28) for Pb, and 74.03â¯% (SD= 22.96), 22.93â¯% (SD= 73), and 24.95â¯% (SD= 49.5) for Zn using M2, M3, and M4, respectively. We also assessed four washing techniques to remove external contamination of arsenic (As), mercury (Hg), and zinc (Zn) from bird feathers. We identified the four most prevalent washing techniques in the literature used for feathers. We used feathers from the great horned owl (Bubo virginianus) and the great blue heron (Ardea herodias) to test these methods. Percentages of trace metal removed are 34.35â¯% (SD= 44.22), 69.22â¯% (SD= 36.5), 62.59â¯% (SD= 48.37), and 80.89â¯% (SD= 14.54) for As, 66.97â¯% (SD= 13.26), 29.4â¯% (SD= 67.06), 49.68â¯% (SD= 42.33), and 28.88â¯% (SD= 69) for Hg, and <0â¯% (SD= 80.1), 0â¯% (SD= 29.55), 11.23â¯% (SD= 47.73), and 57.09â¯% (SD= 21.2) for Zn using M2, M3, M4, and M5, respectively. This study shows the importance of washing fur and feather samples prior to trace metals analyses in ecotoxicology and biomonitoring studies.
Asunto(s)
Pelaje de Animal , Arsénico , Quirópteros , Monitoreo del Ambiente , Plumas , Plomo , Oligoelementos , Zinc , Animales , Plumas/química , Oligoelementos/análisis , Monitoreo del Ambiente/métodos , Pelaje de Animal/química , Plomo/análisis , Arsénico/análisis , Zinc/análisis , Contaminantes Ambientales/análisis , Aves , Cabello/químicaRESUMEN
Fifteen poplar varieties were used in a field trial to investigate the phytoremediation efficiency, stress resistance, and wood property of poplar hybrid varieties with diverse genetic backgrounds under the composite pollution of heavy metals. The coefficient of variation and clone repeatability for growth traits and Cd concentration were large. The Cd accumulation of poplar varieties 107 and QHQ reached 1.9 and 1.7â¯mg, respectively, followed by QHB, Ti, 69, and Pa, in which Cd accumulation reached 1.3â¯mg. Most of the intra-specific hybrid varieties (69, QH1, SL4, T3, and ZL46) had low Cd concentrations and small biomass, resulting in weak Cd accumulation and low phytoremediation efficiency for Cd-polluted soil. By contrast, the inter-sectional and inter-specific hybrid varieties exhibited better growth performance and accumulated higher concentrations of heavy metals than the intra-specific hybrids. The bioconcentration factor and translocation factor of Hg, As, and Pb were less than 1, indicating that poplars have low phytoremediation efficiency for these heavy metals. The hybrids between section Aigeiros and Tacamahaca (QHQ and QHB) and the inter-specific hybrid 107 within section Aigeiros were more resistant to composite heavy metal stress than the other poplar varieties were partially because of their high levels of free proline that exceeded 93⯵g·g-1 FW. According to the correlation analysis of the concentrations of the different heavy metals, the poplar roots absorbed different heavy metals in a cooperative manner, indicating that elite poplar varieties with superior capacity for accumulating diverse heavy metals can be bred feasibly. Compared with the intra-specific hybrid varieties, the inter-sectional (QHQ and QHB) and inter-specific (107) hybrid varieties had higher pollution remediation efficiency, larger biomass, higher cellulose content, and lower lignin content, which is beneficial for pulpwood. Therefore, breeding and extending inter-sectional (QHQ and QHB) and inter-specific hybrid varieties can improve the phytoremediation of composite pollution.