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Lv S, Li Y, Li X, Zhu L, Zhu Y, Guo C, Li Y. Silica nanoparticles triggered epithelial ferroptosis via miR-21-5p/GCLM signaling to contribute to fibrogenesis in the lungs. Chem Biol Interact 2024; 399:111121. [PMID: 38944326 DOI: 10.1016/j.cbi.2024.111121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2024] [Revised: 06/24/2024] [Accepted: 06/27/2024] [Indexed: 07/01/2024]
Abstract
The toxicity of silica nanoparticles (SiNPs) to lung is known. We previously demonstrated that exposure to SiNPs promoted pulmonary impairments, but the precise pathogenesis remains elucidated. Ferroptosis has now been identified as a unique form of oxidative cell death, but whether it participated in SiNPs-induced lung injury remains unclear. In this work, we established a rat model with sub-chronic inhalation exposure of SiNPs via intratracheal instillation, and conducted histopathological examination, iron detection, and ferroptosis-related lipid peroxidation and protein assays. Moreover, we evaluated the effect of SiNPs on epithelial ferroptosis, possible mechanisms using in vitro-cultured human bronchial epithelial cells (16HBE), and also assessed the ensuing impact on fibroblast activation for fibrogenesis. Consequently, fibrotic lesions occurred in the rat lungs, concomitantly by enhanced lipid peroxidation, iron overload, and ferroptosis. Consistently, the in vitro data showed SiNPs triggered oxidative stress and caused the accumulation of lipid peroxides, resulting in ferroptosis. Importantly, the mechanistic investigation revealed miR-21-5p as a key player in the epithelial ferroptotic process induced by SiNPs via targeting GCLM for GSH depletion. Of note, ferrostatin-1 could greatly suppress ferroptosis and alleviate epithelial injury and ensuing fibroblast activation by SiNPs. In conclusion, our findings first revealed SiNPs triggered epithelial ferroptosis through miR-21-5p/GCLM signaling and thereby promoted fibroblast activation for fibrotic lesions, and highlighted the therapeutic potential of inhibiting ferroptosis against lung impairments upon SiNPs exposure.
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Affiliation(s)
- Songqing Lv
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing, 100069, China; Beijing Key Laboratory of Mental Disorders, National Clinical Research Center for Mental Disorders & National Center for Mental Disorders, Beijing Anding Hospital, Capital Medical University, Beijing, 100088, China
| | - Yan Li
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, Beijing, 100069, China
| | - Xueyan Li
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, Beijing, 100069, China
| | - Lingnan Zhu
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, Beijing, 100069, China
| | - Yurou Zhu
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing, 100069, China
| | - Caixia Guo
- Department of Occupational Health and Environmental Health, School of Public Health, Capital Medical University, Beijing, 100069, China.
| | - Yanbo Li
- Department of Toxicology and Sanitary Chemistry, School of Public Health, Capital Medical University, Beijing, 100069, China.
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2
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Khan F, Chen Y, Hartwell HJ, Yan J, Lin YH, Freedman A, Zhang Z, Zhang Y, Lambe AT, Turpin BJ, Gold A, Ault AP, Szmigielski R, Fry RC, Surratt JD. Heterogeneous Oxidation Products of Fine Particulate Isoprene Epoxydiol-Derived Methyltetrol Sulfates Increase Oxidative Stress and Inflammatory Gene Responses in Human Lung Cells. Chem Res Toxicol 2023; 36:1814-1825. [PMID: 37906555 DOI: 10.1021/acs.chemrestox.3c00278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2023]
Abstract
Hydroxyl radical (·OH)-initiated oxidation of isoprene, the most abundant nonmethane hydrocarbon in the atmosphere, is responsible for substantial amounts of secondary organic aerosol (SOA) within ambient fine particles. Fine particulate 2-methyltetrol sulfate diastereoisomers (2-MTSs) are abundant SOA products formed via acid-catalyzed multiphase chemistry of isoprene-derived epoxydiols with inorganic sulfate aerosols under low-nitric oxide conditions. We recently demonstrated that heterogeneous ·OH oxidation of particulate 2-MTSs leads to the particle-phase formation of multifunctional organosulfates (OSs). However, it remains uncertain if atmospheric chemical aging of particulate 2-MTSs induces toxic effects within human lung cells. We show that inhibitory concentration-50 (IC50) values decreased from exposure to fine particulate 2-MTSs that were heterogeneously aged for 0 to 22 days by ·OH, indicating increased particulate toxicity in BEAS-2B lung cells. Lung cells further exhibited concentration-dependent modulation of oxidative stress- and inflammatory-related gene expression. Principal component analysis was carried out on the chemical mixtures and revealed positive correlations between exposure to aged multifunctional OSs and altered expression of targeted genes. Exposure to particulate 2-MTSs alone was associated with an altered expression of antireactive oxygen species (ROS)-related genes (NQO-1, SOD-2, and CAT) indicative of a response to ROS in the cells. Increased aging of particulate 2-MTSs by ·OH exposure was associated with an increased expression of glutathione pathway-related genes (GCLM and GCLC) and an anti-inflammatory gene (IL-10).
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Affiliation(s)
- Faria Khan
- Institute of Physical Chemistry,Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Yuzhi Chen
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Hadley J Hartwell
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Jin Yan
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Ying-Hsuan Lin
- Department of Environmental Sciences, University of California, Riverside, California 92521, United States
| | - Anastasia Freedman
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Zhenfa Zhang
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Yue Zhang
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Department of Atmospheric Sciences, Texas A&M University, College Station Texas 77843, United States
| | - Andrew T Lambe
- Aerodyne Research Inc, Billerica, Massachusetts 01821, United States
| | - Barbara J Turpin
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Avram Gold
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Andrew P Ault
- Department of Chemistry, College of Literature, Science, and the Arts, University of Michigan, Ann Arbor, Michigan 48109, United States
| | - Rafal Szmigielski
- Institute of Physical Chemistry,Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Rebecca C Fry
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Jason D Surratt
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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3
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Schaupp CM, Botta D, White CC, Scoville DK, Srinouanprachanh S, Bammler TK, MacDonald J, Kavanagh TJ. Persistence of improved glucose homeostasis in Gclm null mice with age and cadmium treatment. Redox Biol 2022; 49:102213. [PMID: 34953454 PMCID: PMC8715110 DOI: 10.1016/j.redox.2021.102213] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Revised: 12/07/2021] [Accepted: 12/13/2021] [Indexed: 12/23/2022] Open
Abstract
Antioxidant signaling/communication is among the most important cellular defense and survival pathways, and the importance of redox signaling and homeostasis in aging has been well-documented. Intracellular levels of glutathione (GSH), a very important endogenous antioxidant, both govern and are governed by the Nrf2 pathway through expression of genes involved in its biosynthesis, including the subunits of the rate-limiting enzyme (glutamate cysteine ligase, GCL) in GSH production, GCLC and GCLM. Mice homozygous null for the Gclm gene are severely deficient in GSH compared to wild-type controls, expressing approximately 10% of normal GSH levels. To compensate for GSH deficiency, Gclm null mice have upregulated redox-regulated genes, and, surprisingly, are less susceptible to certain types of oxidative damage. Furthermore, young Gclm null mice display an interesting lean phenotype, resistance to high fat diet-induced diabetes and obesity, improved insulin and glucose tolerance, and decreased expression of genes involved in lipogenesis. However, the persistence of this phenotype has not been investigated into old age, which is important in light of studies which suggest aging attenuates antioxidant signaling, particularly in response to exogenous stimuli. In this work, we addressed whether aging compromises the favorable phenotype of increased antioxidant activity and improved glucose homeostasis observed in younger Gclm null mice. We present data showing that under basal conditions and in response to cadmium exposure (2 mg/kg, dosed once via intraperitoneal injection), the phenotype previously described in young (<6 months) Gclm null mice persists into old age (24+ months). We also provide evidence that transcriptional activation of the Nrf2, AMPK, and PPARγ pathways underlie the favorable metabolic phenotype observed previously in young Gclm null mice.
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Affiliation(s)
- Christopher M Schaupp
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, 98195, USA
| | - Dianne Botta
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, 98195, USA
| | - Collin C White
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, 98195, USA
| | - David K Scoville
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, 98195, USA
| | - Sengkeo Srinouanprachanh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, 98195, USA
| | - Theo K Bammler
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, 98195, USA
| | - James MacDonald
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, 98195, USA
| | - Terrance J Kavanagh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, 98195, USA.
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4
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Valderrama A, Zapata MI, Hernandez JC, Cardona-Arias JA. Systematic review of preclinical studies on the neutrophil-mediated immune response to air pollutants, 1980-2020. Heliyon 2022; 8:e08778. [PMID: 35128092 PMCID: PMC8810373 DOI: 10.1016/j.heliyon.2022.e08778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 09/24/2021] [Accepted: 01/12/2022] [Indexed: 12/11/2022] Open
Abstract
Preclinical evidence about the neutrophil-mediated response in exposure to air pollutants is scattered and heterogeneous. This has prevented the consolidation of this research field around relevant models that could advance towards clinical research. The purpose of this study was to systematic review the studies of the neutrophils response to air pollutants, following the recommendations of the Cochrane Collaboration and the PRISMA guide, through 54 search strategies in nine databases. We include 234 studies (in vitro, and in vivo), being more frequent using primary neutrophils, Balb/C and C57BL6/J mice, and Sprague-Dawley and Wistar rats. The most frequent readouts were cell counts, cytokines and histopathology. The temporal analysis showed that in the last decade, the use of mice with histopathological and cytokine measurement have predominated. This systematic review has shown that study of the neutrophils response to air pollutants started 40 years ago, and composed of 100 different preclinical models, 10 pollutants, and 11 immunological outcomes. Mechanisms of neutrophils-mediated immunopathology include cellular activation, ROS production, and proinflammatory effects, leading to cell-death, oxidative stress, and inflammatory infiltrates in lungs. This research will allow consolidating the research efforts in this field, optimizing the study of causal processes, and facilitating the advance to clinical studies.
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Affiliation(s)
- Andrés Valderrama
- Infettare, Facultad de Medicina, Universidad Cooperativa de Colombia, Colombia
| | - Maria Isabel Zapata
- Infettare, Facultad de Medicina, Universidad Cooperativa de Colombia, Colombia
| | - Juan C. Hernandez
- Infettare, Facultad de Medicina, Universidad Cooperativa de Colombia, Colombia
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5
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Nicholas TP, Boyes WK, Scoville DK, Workman TW, Kavanagh TJ, Altemeier WA, Faustman EM. The effects of gene × environment interactions on silver nanoparticle toxicity in the respiratory system: An adverse outcome pathway. WILEY INTERDISCIPLINARY REVIEWS. NANOMEDICINE AND NANOBIOTECHNOLOGY 2021; 13:e1708. [PMID: 33768701 DOI: 10.1002/wnan.1708] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 01/07/2021] [Accepted: 01/30/2021] [Indexed: 11/07/2022]
Abstract
The Adverse Outcome Pathway (AOP) framework is serving as a basis to integrate new data streams in order to enhance the power of predictive toxicology. AOP development for engineered nanomaterials (ENM), including silver nanoparticles (AgNP), is currently lagging behind other chemicals of regulatory interest due to our limited understanding of the mechanism by which underlying genetics or diseases directly modify host response to AgNP exposures. This also highlights the importance of considering the Aggregate Exposure Pathway (AEP) framework, which precedes the AOP framework and outlines source to target site exposure. The AEP and AOP frameworks interface at the target site, where a molecular initiating event (MIE) occurs and is followed by key events (KE) for adverse cellular and organ responses along a biological pathway and ends with the adverse organism response. The primary goal of this study is to use AgNP to interrogate the AEP-AOP framework by organizing and integrating in vitro dose-response data and in vivo exposure-response data from previous studies to evaluate the effects of interactions between host genetic and acquired factors, or gene × environment interactions (G × E), on AgNP toxicity in the respiratory system. Using this framework will help us to identify plausible key event relationships (KER) between MIE and adverse organism responses when KE are not measured using the same assay in order to derive future predictive models, guide research, and support development of tools for making risk-based, regulatory decisions on ENM. This article is categorized under: Toxicology and Regulatory Issues in Nanomedicine > Toxicology of Nanomaterials Toxicology and Regulatory Issues in Nanomedicine > Regulatory and Policy Issues in Nanomedicine.
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Affiliation(s)
- Tyler P Nicholas
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, University of Washington, Seattle, Washington, USA
| | - William K Boyes
- Center for Public Health and Environmental Assessment, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
| | - David K Scoville
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
| | - Tomomi W Workman
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
| | - Terrance J Kavanagh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, University of Washington, Seattle, Washington, USA
| | - William A Altemeier
- Department of Medicine, Division of Pulmonary, Critical Care, and Sleep Medicine, University of Washington, Seattle, Washington, USA
| | - Elaine M Faustman
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
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6
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Nicholas TP, Haick AK, Workman TW, Griffith WC, Nolin JD, Kavanagh TJ, Faustman EM, Altemeier WA. The effects of genotype × phenotype interactions on silver nanoparticle toxicity in organotypic cultures of murine tracheal epithelial cells. Nanotoxicology 2020; 14:908-928. [PMID: 32574512 DOI: 10.1080/17435390.2020.1777475] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Silver nanoparticles (AgNP) are used in multiple applications but primarily in the manufacturing of antimicrobial products. Previous studies have identified AgNP toxicity in airway epithelial cells, but no in vitro studies to date have used organotypic cultures as a high-content in vitro model of the conducting airway to characterize the effects of interactions between host genetic and acquired factors, or gene × phenotype interactions (G × P), on AgNP toxicity. In the present study, we derived organotypic cultures from primary murine tracheal epithelial cells (MTEC) to characterize nominal and dosimetric dose-response relationships for AgNPs with a gold core on barrier dysfunction, glutathione (GSH) depletion, reactive oxygen species (ROS) production, lipid peroxidation, and cytotoxicity across two genotypes (A/J and C57BL/6J mice), two phenotypes ('Normal' and 'Type 2 [T2]-Skewed'), and two exposures (an acute exposure of 24 h and a subacute exposure of 4 h, every other day, over 5 days [5 × 4 h]). We characterized the 'T2-Skewed' phenotype as an in vitro model of chronic respiratory diseases, which was marked by increased sensitivity to AgNP-induced barrier dysfunction, GSH depletion, ROS production, lipid peroxidation, and cytotoxicity, suggesting that asthmatics are a sensitive population to AgNP exposures in occupational settings. This also suggests that exposure limits, which should be based upon the most sensitive population, should be derived using in vitro and in vivo models of chronic respiratory diseases. This study highlights the importance of considering dosimetry as well as G × P effects when screening and prioritizing potential respiratory toxicants. Such in vitro studies can be used to inform regulatory policy aimed at special protections for all populations.
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Affiliation(s)
- Tyler P Nicholas
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA.,Center for Lung Biology, University of Washington, Seattle, WA, USA
| | - Anoria K Haick
- Vaccine and Infectious Disease Division, Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Tomomi W Workman
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - William C Griffith
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - James D Nolin
- Center for Lung Biology, University of Washington, Seattle, WA, USA
| | - Terrance J Kavanagh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA.,Center for Lung Biology, University of Washington, Seattle, WA, USA
| | - Elaine M Faustman
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - William A Altemeier
- Center for Lung Biology, University of Washington, Seattle, WA, USA.,Department of Medicine, University of Washington, Seattle, WA, USA
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7
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Scoville DK, Li CY, Wang D, Dempsey JL, Raftery D, Mani S, Gu H, Cui JY. Polybrominated Diphenyl Ethers and Gut Microbiome Modulate Metabolic Syndrome-Related Aqueous Metabolites in Mice. Drug Metab Dispos 2019; 47:928-940. [PMID: 31123037 DOI: 10.1124/dmd.119.086538] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 05/07/2019] [Indexed: 12/13/2022] Open
Abstract
Polybrominated diphenyl ethers (PBDEs) are persistent environmental toxicants associated with increased risk for metabolic syndrome. Intermediary metabolism is influenced by the intestinal microbiome. To test the hypothesis that PBDEs reduce host-beneficial intermediary metabolites in an intestinal microbiome-dependent manner, 9-week old male conventional (CV) and germ-free (GF) C57BL/6 mice were orally gavaged once daily with vehicle, BDE-47, or BDE-99 (100 μmol/kg) for 4 days. Intestinal microbiome (16S rDNA sequencing), liver transcriptome (RNA-Seq), and intermediary metabolites in serum, liver, as well as small and large intestinal contents (SIC and LIC; LC-MS) were examined. Changes in intermediary metabolite abundances in serum, liver, and SIC, were observed under basal conditions (CV vs. GF mice) and by PBDE exposure. PBDEs altered the largest number of metabolites in the LIC; most were regulated by PBDEs in GF conditions. Importantly, intestinal microbiome was necessary for PBDE-mediated decreases in branched-chain and aromatic amino acid metabolites, including 3-indolepropionic acid, a tryptophan metabolite recently shown to be protective against inflammation and diabetes. Gene-metabolite networks revealed a positive association between the hepatic glycan synthesis gene α-1,6-mannosyltransferase (Alg12) mRNA and mannose, which are important for protein glycosylation. Glycome changes have been observed in patients with metabolic syndrome. In LIC of CV mice, 23 bacterial taxa were regulated by PBDEs. Correlations of certain taxa with distinct serum metabolites further highlight a modulatory role of the microbiome in mediating PBDE effects. In summary, PBDEs impact intermediary metabolism in an intestinal microbiome-dependent manner, suggesting that dysbiosis may contribute to PBDE-mediated toxicities that include metabolic syndrome.
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Affiliation(s)
- David K Scoville
- Department of Environmental and Occupational Health Sciences (D.K.S., C.Y.L., J.L.D., J.Y.C.) and Northwest Metabolomics Research Center, Department of Anesthesiology and Pain Medicine (D.W., D.R.), University of Washington, Seattle, Washington; Department of Laboratorial Science and Technology, School of Public Health, Peking University, Beijing, P. R. China (D.W.); Albert Einstein College of Medicine, Bronx, New York (S.M.); and Arizona Metabolomics Laboratory, School of Nutrition and Health Promotion, College of Health Solutions, Arizona State University, Phoenix, Arizona (H.G.)
| | - Cindy Yanfei Li
- Department of Environmental and Occupational Health Sciences (D.K.S., C.Y.L., J.L.D., J.Y.C.) and Northwest Metabolomics Research Center, Department of Anesthesiology and Pain Medicine (D.W., D.R.), University of Washington, Seattle, Washington; Department of Laboratorial Science and Technology, School of Public Health, Peking University, Beijing, P. R. China (D.W.); Albert Einstein College of Medicine, Bronx, New York (S.M.); and Arizona Metabolomics Laboratory, School of Nutrition and Health Promotion, College of Health Solutions, Arizona State University, Phoenix, Arizona (H.G.)
| | - Dongfang Wang
- Department of Environmental and Occupational Health Sciences (D.K.S., C.Y.L., J.L.D., J.Y.C.) and Northwest Metabolomics Research Center, Department of Anesthesiology and Pain Medicine (D.W., D.R.), University of Washington, Seattle, Washington; Department of Laboratorial Science and Technology, School of Public Health, Peking University, Beijing, P. R. China (D.W.); Albert Einstein College of Medicine, Bronx, New York (S.M.); and Arizona Metabolomics Laboratory, School of Nutrition and Health Promotion, College of Health Solutions, Arizona State University, Phoenix, Arizona (H.G.)
| | - Joseph L Dempsey
- Department of Environmental and Occupational Health Sciences (D.K.S., C.Y.L., J.L.D., J.Y.C.) and Northwest Metabolomics Research Center, Department of Anesthesiology and Pain Medicine (D.W., D.R.), University of Washington, Seattle, Washington; Department of Laboratorial Science and Technology, School of Public Health, Peking University, Beijing, P. R. China (D.W.); Albert Einstein College of Medicine, Bronx, New York (S.M.); and Arizona Metabolomics Laboratory, School of Nutrition and Health Promotion, College of Health Solutions, Arizona State University, Phoenix, Arizona (H.G.)
| | - Daniel Raftery
- Department of Environmental and Occupational Health Sciences (D.K.S., C.Y.L., J.L.D., J.Y.C.) and Northwest Metabolomics Research Center, Department of Anesthesiology and Pain Medicine (D.W., D.R.), University of Washington, Seattle, Washington; Department of Laboratorial Science and Technology, School of Public Health, Peking University, Beijing, P. R. China (D.W.); Albert Einstein College of Medicine, Bronx, New York (S.M.); and Arizona Metabolomics Laboratory, School of Nutrition and Health Promotion, College of Health Solutions, Arizona State University, Phoenix, Arizona (H.G.)
| | - Sridhar Mani
- Department of Environmental and Occupational Health Sciences (D.K.S., C.Y.L., J.L.D., J.Y.C.) and Northwest Metabolomics Research Center, Department of Anesthesiology and Pain Medicine (D.W., D.R.), University of Washington, Seattle, Washington; Department of Laboratorial Science and Technology, School of Public Health, Peking University, Beijing, P. R. China (D.W.); Albert Einstein College of Medicine, Bronx, New York (S.M.); and Arizona Metabolomics Laboratory, School of Nutrition and Health Promotion, College of Health Solutions, Arizona State University, Phoenix, Arizona (H.G.)
| | - Haiwei Gu
- Department of Environmental and Occupational Health Sciences (D.K.S., C.Y.L., J.L.D., J.Y.C.) and Northwest Metabolomics Research Center, Department of Anesthesiology and Pain Medicine (D.W., D.R.), University of Washington, Seattle, Washington; Department of Laboratorial Science and Technology, School of Public Health, Peking University, Beijing, P. R. China (D.W.); Albert Einstein College of Medicine, Bronx, New York (S.M.); and Arizona Metabolomics Laboratory, School of Nutrition and Health Promotion, College of Health Solutions, Arizona State University, Phoenix, Arizona (H.G.)
| | - Julia Yue Cui
- Department of Environmental and Occupational Health Sciences (D.K.S., C.Y.L., J.L.D., J.Y.C.) and Northwest Metabolomics Research Center, Department of Anesthesiology and Pain Medicine (D.W., D.R.), University of Washington, Seattle, Washington; Department of Laboratorial Science and Technology, School of Public Health, Peking University, Beijing, P. R. China (D.W.); Albert Einstein College of Medicine, Bronx, New York (S.M.); and Arizona Metabolomics Laboratory, School of Nutrition and Health Promotion, College of Health Solutions, Arizona State University, Phoenix, Arizona (H.G.)
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8
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Modulation of Pseudomonas aeruginosa Quorum Sensing by Glutathione. J Bacteriol 2019; 201:JB.00685-18. [PMID: 30782628 DOI: 10.1128/jb.00685-18] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Accepted: 02/07/2019] [Indexed: 01/24/2023] Open
Abstract
Pseudomonas aeruginosa uses quorum sensing (QS) to regulate the production of a battery of secreted products. At least some of these products are shared among the population and serve as public goods. When P. aeruginosa is grown on casein as the sole carbon and energy source, the QS-induced extracellular protease elastase is required for growth. We isolated a P. aeruginosa variant, which showed increased production of QS-induced factors after repeated transfers in casein broth. This variant, P. aeruginosa QS*, had a mutation in the glutathione synthesis gene gshA We describe several experiments that show a gshA coding variant and glutathione affect the QS response. The P. aeruginosa QS transcription factor LasR has a redox-sensitive cysteine (C79). We report that GshA variant cells with a LasR C79S substitution show a similar QS response to that of wild-type P. aeruginosa Surprisingly, it is not LasR but the QS transcription factor RhlR that is more active in bacteria containing the variant gshA Our results demonstrate that QS integrates information about cell density and the cellular redox state via glutathione levels.IMPORTANCE Pseudomonas aeruginosa and other bacteria coordinate group behaviors using a chemical communication system called quorum sensing (QS). The QS system of P. aeruginosa is complex, with several regulators and signals. We show that decreased levels of glutathione lead to increased gene activation in P. aeruginosa, which did not occur in a strain carrying the redox-insensitive variant of a transcription factor. The ability of P. aeruginosa QS transcription factors to integrate information about cell density and cellular redox state shows these transcription factors can fine-tune levels of the gene products they control in response to at least two types of signals or cues.
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9
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Scoville DK, Nolin JD, Ogden HL, An D, Afsharinejad Z, Johnson BW, Bammler TK, Gao X, Frevert CW, Altemeier WA, Hallstrand TS, Kavanagh TJ. Quantum dots and mouse strain influence house dust mite-induced allergic airway disease. Toxicol Appl Pharmacol 2019; 368:55-62. [PMID: 30682383 DOI: 10.1016/j.taap.2019.01.018] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Revised: 01/20/2019] [Accepted: 01/21/2019] [Indexed: 01/19/2023]
Abstract
Quantum dot nanoparticles (QDs) are engineered nanomaterials (ENMs) that have utility in many industries due to unique optical properties not available in small molecules or bulk materials. QD-induced acute lung inflammation and toxicity in rodent models raise concerns about potential human health risks. Recent studies have also shown that some ENMs can exacerbate allergic airway disease (AAD). In this study, C57BL/6J and A/J mice were exposed to saline, house dust mite (HDM), or a combination of HDM and QDs on day 1 of the sensitization protocol. Mice were then challenged on days 8, 9 and 10 with HDM or saline only. Significant differences in cellular and molecular markers of AAD induced by both HDM and HDM + QD were observed between C57BL/6J and A/J mice. Among A/J mice, HDM + QD co-exposure, but not HDM exposure alone, significantly increased levels of bronchoalveolar lavage fluid (BALF). IL-33 compared to saline controls. BALF total protein levels in both mouse strains were also only significantly increased by HDM + QD co-exposure. In addition, A/J mice had significantly more lung type 2 innate lymphoid cells (ILC2s) cells than C57BL/6J mice. A/J lung ILC2s were inversely correlated with lung glutathione and MHC-IIhigh resident macrophages, and positively correlated with MHC-IIlow resident macrophages. The results from this study suggest that 1) QDs influence HDM-induced AAD by potentiating and/or enhancing select cytokine production; 2) that genetic background modulates the impact of QDs on HDM sensitization; and 3) that potential ILC2 contributions to HDM induced AAD are also likely to be modulated by genetic background.
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Affiliation(s)
- David K Scoville
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - James D Nolin
- Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - H Luke Ogden
- Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Dowon An
- Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Zahra Afsharinejad
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Brian W Johnson
- Department of Comparative Medicine, University of Washington, Seattle, WA 98195, USA
| | - Theo K Bammler
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Xiaohu Gao
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Charles W Frevert
- Department of Comparative Medicine, University of Washington, Seattle, WA 98195, USA
| | | | - Teal S Hallstrand
- Department of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Terrance J Kavanagh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA.
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10
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Scoville DK, White CC, Botta D, An D, Afsharinejad Z, Bammler TK, Gao X, Altemeier WA, Kavanagh TJ. Quantum dot induced acute changes in lung mechanics are mouse strain dependent. Inhal Toxicol 2018; 30:397-403. [DOI: 10.1080/08958378.2018.1542046] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- David K. Scoville
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Collin C. White
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Dianne Botta
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Dowon An
- Department of Medicine, University of Washington, Seattle, WA, USA
| | - Zahra Afsharinejad
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Theo K. Bammler
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Xiaohu Gao
- Department of Bioengineering, University of Washington, Seattle, WA, USA
| | | | - Terrance J. Kavanagh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
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11
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Costa LG, Chang YC, Cole TB. Developmental Neurotoxicity of Traffic-Related Air Pollution: Focus on Autism. Curr Environ Health Rep 2017; 4:156-165. [PMID: 28417440 PMCID: PMC5952375 DOI: 10.1007/s40572-017-0135-2] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
PURPOSE OF REVIEW Epidemiological and animal studies suggest that air pollution may negatively affect the central nervous system (CNS) and contribute to CNS diseases. Traffic-related air pollution is a major contributor to global air pollution, and diesel exhaust (DE) is its most important component. RECENT FINDINGS Several studies suggest that young individuals may be particularly susceptible to air pollution-induced neurotoxicity and that perinatal exposure may cause or contribute to developmental disabilities and behavioral abnormalities. In particular, a number of recent studies have found associations between exposures to traffic-related air pollution and autism spectrum disorders (ASD), which are characterized by impairment in socialization and in communication and by the presence of repetitive and unusual behaviors. The cause(s) of ASD are unknown, and while it may have a hereditary component, environmental factors are increasingly suspected as playing a pivotal role in its etiology, particularly in genetically susceptible individuals. Autistic children present higher levels of neuroinflammation and systemic inflammation, which are also hallmarks of exposure to traffic-related air pollution. Gene-environment interactions may play a relevant role in determining individual susceptibility to air pollution developmental neurotoxicity. Given the worldwide presence of elevated air pollution, studies on its effects and mechanisms on the developing brain, genetic susceptibility, role in neurodevelopmental disorders, and possible therapeutic interventions are certainly warranted.
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Affiliation(s)
- Lucio G Costa
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, 4225 Roosevelt, Suite No. 100, Seattle, WA, 98105, USA.
- Department of Neuroscience, University of Parma, Parma, Italy.
| | - Yu-Chi Chang
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, 4225 Roosevelt, Suite No. 100, Seattle, WA, 98105, USA
| | - Toby B Cole
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, 4225 Roosevelt, Suite No. 100, Seattle, WA, 98105, USA
- Center on Human Development and Disability, University of Washington, Seattle, WA, USA
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12
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Luderer U, Myers MB, Banda M, McKim KL, Ortiz L, Parsons BL. Ovarian effects of prenatal exposure to benzo[a]pyrene: Roles of embryonic and maternal glutathione status. Reprod Toxicol 2017; 69:187-195. [PMID: 28279692 PMCID: PMC5422106 DOI: 10.1016/j.reprotox.2017.03.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2017] [Revised: 02/27/2017] [Accepted: 03/01/2017] [Indexed: 01/27/2023]
Abstract
Females deficient in the glutamate cysteine ligase modifier subunit (Gclm) of the rate-limiting enzyme in glutathione synthesis are more sensitive to ovarian follicle depletion and tumorigenesisby prenatal benzo[a]pyrene (BaP) exposure than Gclm+/+ mice. We investigated effects of prenatal exposure to BaP on reproductive development and ovarian mutations in Kras, a commonly mutated gene in epithelial ovarian tumors. Pregnantmice were dosed from gestational day 6.5 through 15.5 with 2mg/kg/day BaP or vehicle. Puberty onset occurred 5 days earlier in F1 daughters of all Gclm genotypes exposed to BaP compared to controls. Gclm+/- F1 daughters of Gclm+/- mothers and wildtype F1 daughters of wildtype mothers had similar depletion of ovarian follicles following prenatal exposure to BaP, suggesting that maternal Gclm genotype does not modify ovarian effects of prenatal BaP. We observed no BaP treatment or Gclm genotype related differences in ovarian Kras codon 12 mutations in F1 offspring.
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Affiliation(s)
- Ulrike Luderer
- Division of Occupational and Environmental Medicine, Department of Medicine, University of California Irvine, Irvine, CA 92617, United States; Department of Developmental and Cell Biology, UC Irvine, Irvine, CA 92617, United States; Program in Public Health, UC Irvine, Irvine, CA 92617, United States.
| | - Meagan B Myers
- U.S. Food, Drug Administration, Division of Genetic, Reproductive Toxicology, National Center for Toxicological Research, Jefferson, AR, United States
| | - Malathi Banda
- U.S. Food, Drug Administration, Division of Genetic, Reproductive Toxicology, National Center for Toxicological Research, Jefferson, AR, United States.
| | - Karen L McKim
- U.S. Food, Drug Administration, Division of Genetic, Reproductive Toxicology, National Center for Toxicological Research, Jefferson, AR, United States
| | - Laura Ortiz
- Division of Occupational and Environmental Medicine, Department of Medicine, University of California Irvine, Irvine, CA 92617, United States
| | - Barbara L Parsons
- U.S. Food, Drug Administration, Division of Genetic, Reproductive Toxicology, National Center for Toxicological Research, Jefferson, AR, United States
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13
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Costa LG, Cole TB, Coburn J, Chang YC, Dao K, Roqué PJ. Neurotoxicity of traffic-related air pollution. Neurotoxicology 2017; 59:133-139. [PMID: 26610921 PMCID: PMC4875879 DOI: 10.1016/j.neuro.2015.11.008] [Citation(s) in RCA: 244] [Impact Index Per Article: 34.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2015] [Revised: 11/10/2015] [Accepted: 11/15/2015] [Indexed: 12/31/2022]
Abstract
The central nervous system is emerging as an important target for adverse health effects of air pollution, where it may contribute to neurodevelopmental and neurodegenerative disorders. Air pollution comprises several components, including particulate matter (PM) and ultrafine particulate matter (UFPM), gases, organic compounds, and metals. An important source of ambient PM and UFPM is represented by traffic-related air pollution, primarily diesel exhaust (DE). Human epidemiological studies and controlled animal studies have shown that exposure to air pollution, and to traffic-related air pollution or DE in particular, may lead to neurotoxicity. In particular, air pollution is emerging as a possible etiological factor in neurodevelopmental (e.g. autism spectrum disorders) and neurodegenerative (e.g. Alzheimer's disease) disorders. The most prominent effects caused by air pollution in both humans and animals are oxidative stress and neuro-inflammation. Studies in mice acutely exposed to DE (250-300μg/m3 for 6h) have shown microglia activation, increased lipid peroxidation, and neuro-inflammation in various brain regions, particularly the hippocampus and the olfactory bulb. An impairment of adult neurogenesis was also found. In most cases, the effects of DE were more pronounced in male mice, possibly because of lower antioxidant abilities due to lower expression of paraoxonase 2.
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Affiliation(s)
- Lucio G Costa
- Dept. of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA; Dept. of Neuroscience, University of Parma, Italy.
| | - Toby B Cole
- Dept. of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA; Center on Human Development and Disability, University of Washington, Seattle, WA, USA
| | - Jacki Coburn
- Dept. of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Yu-Chi Chang
- Dept. of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Khoi Dao
- Dept. of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Pamela J Roqué
- Dept. of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA, USA
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14
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Photo-pollution stress in skin: Traces of pollutants (PAH and particulate matter) impair redox homeostasis in keratinocytes exposed to UVA1. J Dermatol Sci 2017; 86:162-169. [PMID: 28153538 DOI: 10.1016/j.jdermsci.2017.01.007] [Citation(s) in RCA: 88] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2016] [Revised: 12/13/2016] [Accepted: 01/11/2017] [Indexed: 01/06/2023]
Abstract
BACKGROUND It is likely that skin is exposed to low concentrations of pollutants such as Polycyclic Aromatic Hydrocarbons (PAH) either through topical penetration by ultrafine particles or by systemic distribution. No precise estimation of pollutants in living skin is available, but literature has reported contamination of blood by PAH at concentrations in the nanomolar range. Some pollutants (PAH for example) are photo-reactive and phototoxic: sunlight and pollution might thus synergistically compromise skin health. OBJECTIVE Here, the biological effects of particulate matter, PM extract and various PAH were compared in normal human epidermal keratinocytes (NHEK) and reconstructed skin model exposed to either daily UV (d-UV 300-400nm) or UVA1 (350-400nm). Impact of pollutants (PM, PAH or PM extract) combined to UV was studied on NHEK by measuring toxicity, redox homeostasis and GSH metabolism in NHEK. METHODS NHEK were exposed to UV from solar simulator (either d-UV or UVA1) combined with pollutants. Viability, clonogenic efficiency, redox homeostasis and GSH metabolism were assessed. RESULTS Pollutants (PAH, PM or PM extract) ±UVA1 irradiation was associated with a significant phototoxic effect that was equal to or greater than that produced by d-UV. This result is interesting considering that UVA1 represents around 80% of daily UV and reaches the dermal-epidermal junction with ease. Moreover, among PAH studied, benzo[a]pyrene and indeno[1,2,3-cd]pyrene were phototoxic at very low concentrations (nanomolar range) on cultured cells or in reconstructed epidermis and also impaired keratinocyte clonogenic potential at sub-toxic doses. ROS generation within cells and in the inner mitochondrial compartment, mitochondrial membrane depolarization and/or reduced ATP production were also noted. Meanwhile, intracellular glutathione concentrations transiently decreased several hours post-treatment and reduction of its synthesis by buthionine sulfoximine potentiated PAH phototoxicity. Consequently, expression of GSH neo-synthesis genes such as SLC7A11 or GCLc was upregulated several hours post-treatment. CONCLUSION These results obtained using PAH concentrations in the range of those reported in blood of pollution-exposed people suggest that exposure to such a photo-pollution stress, particularly if chronic, may impair cutaneous homeostasis and aggravate sunlight-induced skin damage.
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15
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Traffic-Related Air Pollution and Neurodegenerative Diseases: Epidemiological and Experimental Evidence, and Potential Underlying Mechanisms. ADVANCES IN NEUROTOXICOLOGY 2017. [DOI: 10.1016/bs.ant.2017.07.001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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16
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Cole TB, Coburn J, Dao K, Roqué P, Chang YC, Kalia V, Guilarte TR, Dziedzic J, Costa LG. Sex and genetic differences in the effects of acute diesel exhaust exposure on inflammation and oxidative stress in mouse brain. Toxicology 2016; 374:1-9. [PMID: 27865893 PMCID: PMC5154914 DOI: 10.1016/j.tox.2016.11.010] [Citation(s) in RCA: 92] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 10/28/2016] [Accepted: 11/14/2016] [Indexed: 10/20/2022]
Abstract
In addition to increased morbidity and mortality caused by respiratory and cardiovascular diseases, air pollution may also contribute to central nervous system (CNS) diseases. Traffic-related air pollution is a major contributor to global air pollution, and diesel exhaust (DE) is its most important component. DE contains more than 40 toxic air pollutants and is a major constituent of ambient particulate matter (PM), particularly of ultrafine-PM. Limited information suggests that exposure to DE may cause oxidative stress and neuroinflammation in the CNS. We hypothesized that males may be more susceptible than females to DE neurotoxicity, because of a lower level of expression of paraoxonase 2 (PON2), an intracellular anti-oxidant and anti-inflammatory enzyme. Acute exposure of C57BL/6 mice to DE (250-300μg/m3 for 6h) caused significant increases in lipid peroxidation and of pro-inflammatory cytokines (IL-1α, IL-1β, IL-3, IL-6, TNF-α) in various brain regions (particularly olfactory bulb and hippocampus). In a number of cases the observed effects were more pronounced in male than in female mice. DE exposure also caused microglia activation, as measured by increased Iba1 (ionized calcium-binding adapter molecule 1) expression, and of TSPO (translocator protein) binding. Mice heterozygotes for the modifier subunit of glutamate cysteine ligase (the limiting enzyme in glutathione biosynthesis; Gclm+/- mice) appeared to be significantly more susceptible to DE-induced neuroinflammation than wild type mice. These findings indicate that acute exposure to DE causes neuroinflammation and oxidative stress in brain, and suggest that sex and genetic background may play important roles in modulating susceptibility to DE neurotoxicity.
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Affiliation(s)
- Toby B Cole
- Dept. of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, USA; Center on Human Development and Disability, University of Washington, Seattle, WA, USA
| | - Jacki Coburn
- Dept. of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, USA
| | - Khoi Dao
- Dept. of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, USA
| | - Pam Roqué
- Dept. of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, USA
| | - Yu-Chi Chang
- Dept. of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, USA
| | - Vrinda Kalia
- Dept. of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Tomas R Guilarte
- Dept. of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Jennifer Dziedzic
- Dept. of Environmental Health Sciences, Mailman School of Public Health, Columbia University, New York, NY, USA
| | - Lucio G Costa
- Dept. of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, USA; Dept. of Neuroscience, University of Parma, Italy.
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17
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Cartwright MM, Schmuck SC, Corredor C, Wang B, Scoville DK, Chisholm CR, Wilkerson HW, Afsharinejad Z, Bammler TK, Posner JD, Shutthanandan V, Baer DR, Mitra S, Altemeier WA, Kavanagh TJ. The pulmonary inflammatory response to multiwalled carbon nanotubes is influenced by gender and glutathione synthesis. Redox Biol 2016; 9:264-275. [PMID: 27596734 PMCID: PMC5013253 DOI: 10.1016/j.redox.2016.08.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 08/15/2016] [Accepted: 08/18/2016] [Indexed: 12/14/2022] Open
Abstract
Inhalation of multiwalled carbon nanotubes (MWCNTs) during their manufacture or incorporation into various commercial products may cause lung inflammation, fibrosis, and oxidative stress in exposed workers. Some workers may be more susceptible to these effects because of differences in their ability to synthesize the major antioxidant and immune system modulator glutathione (GSH). Accordingly, in this study we examined the influence of GSH synthesis and gender on MWCNT-induced lung inflammation in C57BL/6 mice. GSH synthesis was impaired through genetic manipulation of Gclm, the modifier subunit of glutamate cysteine ligase, the rate-limiting enzyme in GSH synthesis. Twenty-four hours after aspirating 25µg of MWCNTs, all male mice developed neutrophilia in their lungs, regardless of Gclm genotype. However, female mice with moderate (Gclm heterozygous) and severe (Gclm null) GSH deficiencies developed significantly less neutrophilia. We found no indications of MWCNT-induced oxidative stress as reflected in the GSH content of lung tissue and epithelial lining fluid, 3-nitrotyrosine formation, or altered mRNA or protein expression of several redox-responsive enzymes. Our results indicate that GSH-deficient female mice are rendered uniquely susceptible to an attenuated neutrophil response. If the same effects occur in humans, GSH-deficient women manufacturing MWCNTs may be at greater risk for impaired neutrophil-dependent clearance of MWCNTs from the lung. In contrast, men may have effective neutrophil-dependent clearance, but may be at risk for lung neutrophilia regardless of their GSH levels.
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Affiliation(s)
- Megan M Cartwright
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Stefanie C Schmuck
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Charlie Corredor
- Department of Chemical Engineering, University of Washington, Seattle, WA 98195, USA
| | - Bingbing Wang
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - David K Scoville
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Claire R Chisholm
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Hui-Wen Wilkerson
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Zahra Afsharinejad
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Theodor K Bammler
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Jonathan D Posner
- Department of Chemical Engineering, University of Washington, Seattle, WA 98195, USA; Department of Mechanical Engineering, University of Washington, Seattle, WA 98195, USA
| | | | - Donald R Baer
- Environmental Molecular Sciences Laboratory, Pacific Northwest National Laboratory, Richland, WA 99354, USA
| | - Somenath Mitra
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, NJ 07102, USA
| | | | - Terrance J Kavanagh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA.
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18
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Roqué PJ, Dao K, Costa LG. Microglia mediate diesel exhaust particle-induced cerebellar neuronal toxicity through neuroinflammatory mechanisms. Neurotoxicology 2016; 56:204-214. [PMID: 27543421 DOI: 10.1016/j.neuro.2016.08.006] [Citation(s) in RCA: 61] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2016] [Revised: 08/15/2016] [Accepted: 08/15/2016] [Indexed: 10/21/2022]
Abstract
In addition to the well-established effects of air pollution on the cardiovascular and respiratory systems, emerging evidence has implicated it in inducing negative effects on the central nervous system. Diesel exhaust particulate matter (DEP), a major component of air pollution, is a complex mixture of numerous toxicants. Limited studies have shown that DEP-induced dopaminergic neuron dysfunction is mediated by microglia, the resident immune cells of the brain. Here we show that mouse microglia similarly mediate primary cerebellar granule neuron (CGN) death in vitro. While DEP (0, 25, 50, 100μg/2cm2) had no effect on CGN viability after 24h of treatment, in the presence of primary cortical microglia neuronal cell death increased by 2-3-fold after co-treatment with DEP, suggesting that microglia are important contributors to DEP-induced CGN neurotoxicity. DEP (50μg/2cm2) treatment of primary microglia for 24h resulted in morphological changes indicative of microglia activation, suggesting that DEP may induce the release of cytotoxic factors. Microglia-conditioned medium after 24h treatment with DEP, was also toxic to CGNs. DEP caused a significant increase in reactive oxygen species in microglia, however, antioxidants failed to protect neurons from DEP/microglia-induced toxicity. DEP increased mRNA levels of the pro-inflammatory cytokines IL-6 and IL1-β, and the release of IL-6. The antibiotic minocycline (50μM) and the peroxisome proliferator-activated receptor-γ agonist pioglitazone (50μM) attenuated DEP-induced CGN death in the co-culture system. Microglia and CGNs from male mice appeared to be somewhat more susceptible to DEP neurotoxicity than cells from female mice possibly because of lower paraoxonase-2 expression. Together, these results suggest that microglia-induced neuroinflammation may play a critical role in modulating the effect of DEP on neuronal viability. .
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Affiliation(s)
- Pamela J Roqué
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, USA
| | - Khoi Dao
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, USA
| | - Lucio G Costa
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, USA; Department of Neuroscience, University of Parma, Italy.
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19
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Scoville DK, White CC, Botta D, McConnachie LA, Zadworny ME, Schmuck SC, Hu X, Gao X, Yu J, Dills RL, Sheppard L, Delaney MA, Griffith WC, Beyer RP, Zangar RC, Pounds JG, Faustman EM, Kavanagh TJ. Susceptibility to quantum dot induced lung inflammation differs widely among the Collaborative Cross founder mouse strains. Toxicol Appl Pharmacol 2015; 289:240-50. [PMID: 26476918 DOI: 10.1016/j.taap.2015.09.019] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Revised: 08/24/2015] [Accepted: 09/24/2015] [Indexed: 10/22/2022]
Abstract
Quantum dots (QDs) are engineered semiconductor nanoparticles with unique physicochemical properties that make them potentially useful in clinical, research and industrial settings. However, a growing body of evidence indicates that like other engineered nanomaterials, QDs have the potential to be respiratory hazards, especially in the context of the manufacture of QDs and products containing them, as well as exposures to consumers using these products. The overall goal of this study was to investigate the role of mouse strain in determining susceptibility to QD-induced pulmonary inflammation and toxicity. Male mice from 8 genetically diverse inbred strains (the Collaborative Cross founder strains) were exposed to CdSe-ZnS core-shell QDs stabilized with an amphiphilic polymer. QD treatment resulted in significant increases in the percentage of neutrophils and levels of cytokines present in bronchoalveolar lavage fluid (BALF) obtained from NOD/ShiLtJ and NZO/HlLtJ mice relative to their saline (Sal) treated controls. Cadmium measurements in lung tissue indicated strain-dependent differences in disposition of QDs in the lung. Total glutathione levels in lung tissue were significantly correlated with percent neutrophils in BALF as well as with lung tissue Cd levels. Our findings indicate that QD-induced acute lung inflammation is mouse strain dependent, that it is heritable, and that the choice of mouse strain is an important consideration in planning QD toxicity studies. These data also suggest that formal genetic analyses using additional strains or recombinant inbred strains from these mice could be useful for discovering potential QD-induced inflammation susceptibility loci.
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Affiliation(s)
- David K Scoville
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Collin C White
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Dianne Botta
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Lisa A McConnachie
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Megan E Zadworny
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Stefanie C Schmuck
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Xiaoge Hu
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Xiaohu Gao
- Department of Bioengineering, University of Washington, Seattle, WA 98195, USA
| | - Jianbo Yu
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Russell L Dills
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Lianne Sheppard
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA; Department of Biostatistics, University of Washington, Seattle, WA 98195, USA
| | - Martha A Delaney
- Department of Comparative Medicine, University of Washington, Seattle, WA 98195, USA; Department of Pathology, University of Washington, Seattle, WA 98195, USA
| | - William C Griffith
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Richard P Beyer
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Richard C Zangar
- Systems Toxicology Group - Division of Biological Sciences, Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Joel G Pounds
- Systems Toxicology Group - Division of Biological Sciences, Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Elaine M Faustman
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Terrance J Kavanagh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA.
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Gould NS, Min E, Huang J, Chu HW, Good J, Martin RJ, Day BJ. Glutathione Depletion Accelerates Cigarette Smoke-Induced Inflammation and Airspace Enlargement. Toxicol Sci 2015; 147:466-74. [PMID: 26149495 DOI: 10.1093/toxsci/kfv143] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
The study objective was to assess age-related changes in glutathione (GSH) adaptive response to cigarette smoke (CS) exposure. Older cigarette smokers show a decline (67%) in lung epithelial lining fluid (ELF) GSH and a 1.8-fold decreased GSH adaptive response to cigarette smoking with a concomitant elevation (47%) of exhaled nitric oxide compared with younger smokers. In order to isolate the changes in tissue GSH from other age-related effects, pharmacological inhibition of the rate limiting step in GSH synthesis was employed to examine the lung's response to CS exposure in young mice. The γ-glutamylcysteine ligase inhibitor L-buthionine-sulfoximine (BSO) was administered in the drinking water (20 mM) to decrease by half the in vivo GSH levels to those found in aged mice and humans. Mice were then exposed to CS (3 h/day) for 5 or 15 days. Biochemical analysis of the ELF and lung tissue revealed an inhibition of the CS-induced GSH adaptive response by BSO with a concurrent increase in mixed protein-GSH disulfides indicating increased cysteine oxidation. The prevention of the GSH adaptive response led to an increase in pro-inflammatory cytokines present in the lung. Airspace enlargement is a hallmark of lung emphysema and was observed in mice treated with BSO and exposed to CS for as little as 15 days, whereas these types of changes normally take up to 6 months in this model. BSO treatment potentiated both lung elastase and matrix metalloproteinase activity in the CS group. These data suggest that age-related decline in the GSH adaptive response can markedly accelerate many of the factors thought to drive CS-induced emphysema.
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Affiliation(s)
- Neal S Gould
- *Department of Medicine, National Jewish Health, Denver, Colorado 80206; Departments of Pharmaceutical Sciences
| | - Elysia Min
- *Department of Medicine, National Jewish Health, Denver, Colorado 80206
| | - Jie Huang
- *Department of Medicine, National Jewish Health, Denver, Colorado 80206
| | - Hong Wei Chu
- *Department of Medicine, National Jewish Health, Denver, Colorado 80206; Medicine and Immunology, University of Colorado at Denver, Aurora, Colorado 80045
| | - Jim Good
- *Department of Medicine, National Jewish Health, Denver, Colorado 80206
| | - Richard J Martin
- *Department of Medicine, National Jewish Health, Denver, Colorado 80206; Medicine and
| | - Brian J Day
- *Department of Medicine, National Jewish Health, Denver, Colorado 80206; Departments of Pharmaceutical Sciences, Medicine and Immunology, University of Colorado at Denver, Aurora, Colorado 80045
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Grahame TJ, Klemm R, Schlesinger RB. Public health and components of particulate matter: the changing assessment of black carbon. JOURNAL OF THE AIR & WASTE MANAGEMENT ASSOCIATION (1995) 2014; 64:620-60. [PMID: 25039199 DOI: 10.1080/10962247.2014.912692] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
UNLABELLED In 2012, the WHO classified diesel emissions as carcinogenic, and its European branch suggested creating a public health standard for airborne black carbon (BC). In 2011, EU researchers found that life expectancy could be extended four to nine times by reducing a unit of BC, vs reducing a unit of PM2.5. Only recently could such determinations be made. Steady improvements in research methodologies now enable such judgments. In this Critical Review, we survey epidemiological and toxicological literature regarding carbonaceous combustion emissions, as research methodologies improved over time. Initially, we focus on studies of BC, diesel, and traffic emissions in the Western countries (where daily urban BC emissions are mainly from diesels). We examine effects of other carbonaceous emissions, e.g., residential burning of biomass and coal without controls, mainly in developing countries. Throughout the 1990s, air pollution epidemiology studies rarely included species not routinely monitored. As additional PM2.5. chemical species, including carbonaceous species, became more widely available after 1999, they were gradually included in epidemiological studies. Pollutant species concentrations which more accurately reflected subject exposure also improved models. Natural "interventions"--reductions in emissions concurrent with fuel changes or increased combustion efficiency; introduction of ventilation in highway tunnels; implementation of electronic toll payment systems--demonstrated health benefits of reducing specific carbon emissions. Toxicology studies provided plausible biological mechanisms by which different PM species, e.g, carbonaceous species, may cause harm, aiding interpretation of epidemiological studies. Our review finds that BC from various sources appears to be causally involved in all-cause, lung cancer and cardiovascular mortality, morbidity, and perhaps adverse birth and nervous system effects. We recommend that the US. EPA rubric for judging possible causality of PM25. mass concentrations, be used to assess which PM2.5. species are most harmful to public health. IMPLICATIONS Black carbon (BC) and correlated co-emissions appear causally related with all-cause, cardiovascular, and lung cancer mortality, and perhaps with adverse birth outcomes and central nervous system effects. Such findings are recent, since widespread monitoring for BC is also recent. Helpful epidemiological advances (using many health relevant PM2.5 species in models; using better measurements of subject exposure) have also occurred. "Natural intervention" studies also demonstrate harm from partly combusted carbonaceous emissions. Toxicology studies consistently find biological mechanisms explaining how such emissions can cause these adverse outcomes. A consistent mechanism for judging causality for different PM2.5 species is suggested.
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Neurotoxicants are in the air: convergence of human, animal, and in vitro studies on the effects of air pollution on the brain. BIOMED RESEARCH INTERNATIONAL 2014; 2014:736385. [PMID: 24524086 PMCID: PMC3912642 DOI: 10.1155/2014/736385] [Citation(s) in RCA: 134] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 11/06/2013] [Revised: 12/23/2013] [Accepted: 12/24/2013] [Indexed: 12/19/2022]
Abstract
In addition to increased morbidity and mortality caused by respiratory and cardiovascular diseases, air pollution may also negatively affect the brain and contribute to central nervous system diseases. Air pollution is a mixture comprised of several components, of which ultrafine particulate matter (UFPM; <100 nm) is of much concern, as these particles can enter the circulation and distribute to most organs, including the brain. A major constituent of ambient UFPM is represented by traffic-related air pollution, mostly ascribed to diesel exhaust (DE). Human epidemiological studies and controlled animal studies have shown that exposure to air pollution may lead to neurotoxicity. In addition to a variety of behavioral abnormalities, two prominent effects caused by air pollution are oxidative stress and neuroinflammation, which are seen in both humans and animals and are confirmed by in vitro studies. Among factors which can affect neurotoxic outcomes, age is considered the most relevant. Human and animal studies suggest that air pollution (and DE) may cause developmental neurotoxicity and may contribute to the etiology of neurodevelopmental disorders, including autistic spectrum disorders. In addition, air pollution exposure has been associated with increased expression of markers of neurodegenerative disease pathologies.
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Liu Y, Chien WM, Medvedev IO, Weldy CS, Luchtel DL, Rosenfeld ME, Chin MT. Inhalation of diesel exhaust does not exacerbate cardiac hypertrophy or heart failure in two mouse models of cardiac hypertrophy. Part Fibre Toxicol 2013; 10:49. [PMID: 24093778 PMCID: PMC3851491 DOI: 10.1186/1743-8977-10-49] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2013] [Accepted: 10/01/2013] [Indexed: 12/05/2022] Open
Abstract
Background Strong associations have been observed between exposure to fine ambient particulate matter (PM2.5) and adverse cardiovascular outcomes. In particular, exposure to traffic related PM2.5 has been associated with increases in left ventricular hypertrophy, a strong risk factor for cardiovascular mortality. As much of traffic related PM2.5 is derived from diesel exhaust (DE), we investigated the effects of chronic DE exposure on cardiac hypertrophy and heart failure in the adult mouse by exposing mice to DE combined with either of two mouse models of cardiac hypertrophy: angiotensin II infusion or pressure overload induced by transverse aortic banding. Methods Wild type male C57BL/6 J mice were either infused with angiotensin II (800 ng/kg/min) via osmotic minipump implanted subcutaneously for 1 month, or underwent transverse aortic banding (27 gauge needle 1 week for observing acute reactions, 26 gauge needle 3 months or 6 months for observing chronic reactions). Vehicle (saline) infusion or sham surgery was used as a control. Shortly after surgery, mice were transferred to our exposure facility and randomly assigned to either diesel exhaust (300 or 400 μg/m3) or filtered air exposures. After reaching the end of designated time points, echocardiography was performed to measure heart structure and function. Gravimetric analysis was used to measure the ventricular weight to body weight ratio. We also measured heart rate by telemetry using implanted ambulatory ECG monitors. Results Both angiotensin II and transverse aortic banding promoted cardiac hypertrophy compared to vehicle or sham controls. Transverse aortic banding for six months also promoted heart failure in addition to cardiac hypertrophy. In all cases, DE failed to exacerbate the development of hypertrophy or heart failure when compared to filtered air controls. Prolonged DE exposure also led to a decrease in average heart rate. Conclusions Up to 6-months of DE exposure had no effect on cardiac hypertrophy and heart function induced by angiotensin II stimulation or pressure overload in adult C57BL/6 J mice. This study highlights the potential importance of particle constituents of ambient PM2.5 to elicit cardiotoxic effects. Further investigations on particle constituents and cardiotoxicity are warranted.
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Affiliation(s)
- Yonggang Liu
- Division of Cardiology, Department of Medicine, University of Washington, Seattle, WA, USA.
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Weldy CS, Luttrell IP, White CC, Morgan-Stevenson V, Cox DP, Carosino CM, Larson TV, Stewart JA, Kaufman JD, Kim F, Chitaley K, Kavanagh TJ. Glutathione (GSH) and the GSH synthesis gene Gclm modulate plasma redox and vascular responses to acute diesel exhaust inhalation in mice. Inhal Toxicol 2013; 25:444-54. [PMID: 23808636 DOI: 10.3109/08958378.2013.801004] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONTEXT Inhalation of fine particulate matter (PM₂.₅) is associated with acute pulmonary inflammation and impairments in cardiovascular function. In many regions, PM₂.₅ is largely derived from diesel exhaust (DE), and these pathophysiological effects may be due in part to oxidative stress resulting from DE inhalation. The antioxidant glutathione (GSH) is important in limiting oxidative stress-induced vascular dysfunction. The rate-limiting enzyme in GSH synthesis is glutamate cysteine ligase and polymorphisms in its catalytic and modifier subunits (GCLC and GCLM) have been shown to influence vascular function and risk of myocardial infarction in humans. OBJECTIVE We hypothesized that compromised de novo synthesis of GSH in Gclm⁻/⁺ mice would result in increased sensitivity to DE-induced lung inflammation and vascular effects. MATERIALS AND METHODS WT and Gclm⁻/⁺ mice were exposed to DE via inhalation (300 μg/m³) for 6 h. Neutrophil influx into the lungs, plasma GSH redox potential, vascular reactivity of aortic rings and aortic nitric oxide (NO•) were measured. RESULTS DE inhalation resulted in mild bronchoalveolar neutrophil influx in both genotypes. DE-induced effects on plasma GSH oxidation and acetylcholine (ACh)-relaxation of aortic rings were only observed in Gclm⁻/⁺ mice. Contrary to our hypothesis, DE exposure enhanced ACh-induced relaxation of aortic rings in Gclm⁻/⁺ mice. DISCUSSION AND CONCLUSION THESE data support the hypothesis that genetic determinants of antioxidant capacity influence the biological effects of acute inhalation of DE. However, the acute effects of DE on the vasculature may be dependent on the location and types of vessels involved. Polymorphisms in GSH synthesis genes are common in humans and further investigations into these potential gene-environment interactions are warranted.
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Affiliation(s)
- Chad S Weldy
- Department of Environmental and Occupational Health Sciences, University of Washington, Box 354695, Seattle, WA 98195, USA
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McConnachie LA, Botta D, White CC, Weldy CS, Wilkerson HW, Yu J, Dills R, Yu X, Griffith WC, Faustman EM, Farin FM, Gill SE, Parks WC, Hu X, Gao X, Eaton DL, Kavanagh TJ. The glutathione synthesis gene Gclm modulates amphiphilic polymer-coated CdSe/ZnS quantum dot-induced lung inflammation in mice. PLoS One 2013; 8:e64165. [PMID: 23724032 PMCID: PMC3664581 DOI: 10.1371/journal.pone.0064165] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Accepted: 04/10/2013] [Indexed: 11/18/2022] Open
Abstract
Quantum dots (QDs) are unique semi-conductor fluorescent nanoparticles with potential uses in a variety of biomedical applications. However, concerns exist regarding their potential toxicity, specifically their capacity to induce oxidative stress and inflammation. In this study we synthesized CdSe/ZnS core/shell QDs with a tri-n-octylphosphine oxide, poly(maleic anhydride-alt-1-tetradecene) (TOPO-PMAT) coating and assessed their effects on lung inflammation in mice. Previously published in vitro data demonstrated these TOPO-PMAT QDs cause oxidative stress resulting in increased expression of antioxidant proteins, including heme oxygenase, and the glutathione (GSH) synthesis enzyme glutamate cysteine ligase (GCL). We therefore investigated the effects of these QDs in vivo in mice deficient in GSH synthesis (Gclm +/− and Gclm −/− mice). When mice were exposed via nasal instillation to a TOPO-PMAT QD dose of 6 µg cadmium (Cd) equivalents/kg body weight, neutrophil counts in bronchoalveolar lavage fluid (BALF) increased in both Gclm wild-type (+/+) and Gclm heterozygous (+/−) mice, whereas Gclm null (−/−) mice exhibited no such increase. Levels of the pro-inflammatory cytokines KC and TNFα increased in BALF from Gclm +/+ and +/− mice, but not from Gclm −/− mice. Analysis of lung Cd levels suggested that QDs were cleared more readily from the lungs of Gclm −/− mice. There was no change in matrix metalloproteinase (MMP) activity in any of the mice. However, there was a decrease in whole lung myeloperoxidase (MPO) content in Gclm −/− mice, regardless of treatment, relative to untreated Gclm +/+ mice. We conclude that in mice TOPO-PMAT QDs have in vivo pro-inflammatory properties, and the inflammatory response is dependent on GSH synthesis status. Because there is a common polymorphism in humans that influences GCLM expression, these findings imply that humans with reduced GSH synthesis capabilities may be more susceptible to the pro-inflammatory effects of QDs.
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Affiliation(s)
- Lisa A. McConnachie
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Dianne Botta
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Collin C. White
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Chad S. Weldy
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Hui-Wen Wilkerson
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Jianbo Yu
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Russell Dills
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Xiaozhong Yu
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - William C. Griffith
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Elaine M. Faustman
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Federico M. Farin
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Sean E. Gill
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - William C. Parks
- Department of Medicine, University of Washington, Seattle, Washington, United States of America
| | - Xiaoge Hu
- Department of Bioengineering, University of Washington, Seattle, Washington, United States of America
| | - Xiaohu Gao
- Department of Bioengineering, University of Washington, Seattle, Washington, United States of America
| | - David L. Eaton
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
| | - Terrance J. Kavanagh
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, United States of America
- * E-mail:
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Giordano G, Kavanagh TJ, Faustman EM, White CC, Costa LG. Low-level domoic acid protects mouse cerebellar granule neurons from acute neurotoxicity: role of glutathione. Toxicol Sci 2013; 132:399-408. [PMID: 23315585 PMCID: PMC3693515 DOI: 10.1093/toxsci/kft002] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2012] [Accepted: 12/28/2012] [Indexed: 11/14/2022] Open
Abstract
Domoic acid (DomA) is a potent marine neurotoxin. By activating α-amino-3-hydroxy-5-methyl-4-isoxazoleproprionic acid/kainate receptors, DomA induces oxidative stress-mediated apoptotic cell death in neurons. The effect of prolonged (10 days) exposure to a low, nontoxic concentration (5nM) of DomA on acute (intermediate concentration) neurotoxicity of this toxin was investigated in cerebellar granule neurons (CGNs) from wild-type mice and mice lacking the glutamate cysteine ligase (GCL) modifier subunit (Gclm (/)). CGNs from Gclm (/) mice have very low glutathione (GSH) levels and are very sensitive to DomA toxicity. In CGNs from wild-type mice, prolonged exposure to 5nM DomA did not cause any overt toxicity but reduced oxidative stress-mediated apoptotic cell death induced by exposure to an intermediate concentration (100nM for 24h) of DomA. This protection was not observed in CGNs from Gclm (/) mice. Prolonged DomA exposure increased GSH levels in CGNs of wild-type but not Gclm (/) mice. Levels of GCLC (the catalytic subunit of GCL) protein and mRNA were increased in CGNs of both mouse strains, whereas levels of GCLM protein and mRNA, activity of GCL, and levels of GCL holoenzyme were only increased in CGNs of wild-type mice. Chronic DomA exposure also protected wild-type CGNs from acute toxicity of other oxidants. The results indicate that CGNs from Gclm (/) mice, which are already more sensitive to DomA toxicity, are unable to upregulate their GSH levels. As Gclm (/) mice may represent a model for a common human polymorphism in GCLM, such individuals may be at particular risk for DomA-induced neurotoxicity.
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Affiliation(s)
- Gennaro Giordano
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington 98105, USA.
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27
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Weldy CS, Luttrell IP, White CC, Morgan-Stevenson V, Bammler TK, Beyer RP, Afsharinejad Z, Kim F, Chitaley K, Kavanagh TJ. Glutathione (GSH) and the GSH synthesis gene Gclm modulate vascular reactivity in mice. Free Radic Biol Med 2012; 53:1264-78. [PMID: 22824862 PMCID: PMC3625031 DOI: 10.1016/j.freeradbiomed.2012.07.006] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Revised: 06/26/2012] [Accepted: 07/07/2012] [Indexed: 12/13/2022]
Abstract
Oxidative stress has been implicated in the development of vascular disease and in the promotion of endothelial dysfunction via the reduction in bioavailable nitric oxide (NO()). Glutathione (GSH) is a tripeptide thiol antioxidant that is utilized by glutathione peroxidase (GPx) to scavenge reactive oxygen species such as hydrogen peroxide and phospholipid hydroperoxides. Relatively frequent single-nucleotide polymorphisms (SNPs) within the 5' promoters of the GSH synthesis genes GCLC and GCLM are associated with impaired vasomotor function, as measured by decreased acetylcholine-stimulated coronary artery dilation, and with increased risk of myocardial infarction. Although the influence of genetic knockdown of GPx on vascular function has been investigated in mice, no work to date has been published on the role of genetic knockdown of GSH synthesis genes on vascular reactivity. We therefore investigated the effects of targeted disruption of Gclm in mice and the subsequent depletion of GSH on vascular reactivity, NO() production, aortic nitrotyrosine protein modification, and whole-genome transcriptional responses as measured by DNA microarray. Gclm(-/+) and Gclm(-/-) mice had 72 and 12%, respectively, of wild-type (WT) aortic GSH content. Gclm(-/+) mice had a significant impairment in acetylcholine (ACh)-induced relaxation in aortic rings as well as increased aortic nitrotyrosine protein modification. Surprisingly, Gclm(-/-) aortas showed enhanced relaxation compared to Gclm(-/+) aortas, as well as increased NO() production. Although aortic rings from Gclm(-/-) mice had enhanced ACh relaxation, they had a significantly increased sensitivity to phenylephrine (PE)-induced contraction. Alternatively, the PE response of Gclm(-/+) aortas was nearly identical to that of their WT littermates. To examine the role of NO() or other potential endothelium-derived factors in differentially regulating vasomotor activity, we incubated aortic rings with the NO() synthase inhibitor L-NAME or physically removed the endothelium before PE treatment. L-NAME treatment and endothelium removal enhanced PE-induced contraction in WT and Gclm(-/+) mice, but this effect was severely diminished in Gclm(-/-) mice, indicating a potentially unique role for GSH in mediating vessel contraction. Whole-genome assessment of aortic mRNA in Gclm(-/-) and WT mice revealed altered expression of genes within the canonical Ca(2+) signaling pathway, which may have a role in mediating these observed functional effects. These findings provide additional evidence that the de novo synthesis of GSH can influence vascular reactivity and provide insights regarding possible mechanisms by which SNPs within GCLM and GCLC influence the risk of developing vascular diseases in humans.
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Affiliation(s)
- Chad S. Weldy
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, 98195
| | - Ian P. Luttrell
- Department of Urology, School of Medicine, University of Washington, Seattle, WA, 98195
| | - Collin C. White
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, 98195
| | - Vicki Morgan-Stevenson
- Department of Medicine, Division of Cardiology, School of Medicine, University of Washington, Seattle, WA, 98195
| | - Theo K. Bammler
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, 98195
| | - Richard P. Beyer
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, 98195
| | - Zahra Afsharinejad
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, 98195
| | - Francis Kim
- Department of Medicine, Division of Cardiology, School of Medicine, University of Washington, Seattle, WA, 98195
| | - Kanchan Chitaley
- Department of Urology, School of Medicine, University of Washington, Seattle, WA, 98195
| | - Terrance J. Kavanagh
- Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, WA, 98195
- Correspondence should be addressed to: Terrance J. Kavanagh, Ph.D., Department of Environmental and Occupational Health Sciences, Box 354695, University of Washington, Seattle, WA 98195, Phone: (206), 685-8479, Fax: (206) 685-4696
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