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Buford M, Lacher S, Slattery M, Levings DC, Postma B, Holian A, Migliaccio C. A mouse model of wildfire smoke-induced health effects: sex differences in acute and sustained effects of inhalation exposures. Inhal Toxicol 2024; 36:367-377. [PMID: 38769076 PMCID: PMC11298299 DOI: 10.1080/08958378.2024.2354398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 05/07/2024] [Indexed: 05/22/2024]
Abstract
Due to climate change, wildfires have increased in intensity and duration. While wildfires threaten lives directly, the smoke has more far-reaching adverse health impacts. During an extreme 2017 wildfire event, residents of Seeley Lake, Montana were exposed to unusually high levels of wood smoke (WS) causing sustained effects on lung function (decreased FEV1/FVC). Objective: The present study utilized an animal model of WS exposure to research cellular and molecular mechanisms of the resulting health effects. Methods: Mice were exposed to inhaled WS utilizing locally harvested wood to recapitulate community exposures. WS was generated at a rate resulting in a 5 mg/m3 PM2.5 exposure for five days. Results: This exposure resulted in a similar 0.28 mg/m2 particle deposition (lung surface area) in mice that was calculated for human exposure. As with the community observations, there was a significant effect on lung function, increased resistance, and decreased compliance, that was more pronounced in males at an extended (2 months) timepoint and males were more affected than females: ex vivo assays illustrated changes to alveolar macrophage functions (increased TNFα secretion and decreased efferocytosis). Female mice had significantly elevated IL-33 levels in lungs, however, pretreatment of male mice with IL-33 resulted in an abrogation of the observed WS effects, suggesting a dose-dependent role of IL-33. Additionally, there were greater immunotoxic effects in male mice. Discussion: These findings replicated the outcomes in humans and suggest that IL-33 is involved in a mechanism of the adverse effects of WS exposures that inform on potential sex differences.
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Affiliation(s)
- Mary Buford
- University of Montana, Center for Environmental Health Sciences, Missoula, MT
| | - Sarah Lacher
- Department of Biomedical Sciences, University of Minnesota Medical School, Duluth, MN
| | - Matthew Slattery
- Department of Biomedical Sciences, University of Minnesota Medical School, Duluth, MN
| | - Daniel C. Levings
- Department of Biomedical Sciences, University of Minnesota Medical School, Duluth, MN
| | - Britten Postma
- University of Montana, Center for Environmental Health Sciences, Missoula, MT
| | - Andrij Holian
- University of Montana, Center for Environmental Health Sciences, Missoula, MT
| | - Chris Migliaccio
- University of Montana, Center for Environmental Health Sciences, Missoula, MT
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Purves J, Hussey SJK, Corscadden L, Purser L, Hall A, Misra R, Selley L, Monks PS, Ketley JM, Andrew PW, Morrissey JA. Air pollution induces Staphylococcus aureus USA300 respiratory tract colonization mediated by specific bacterial genetic responses involving the global virulence gene regulators Agr and Sae. Environ Microbiol 2022; 24:4449-4465. [PMID: 35642645 PMCID: PMC9796851 DOI: 10.1111/1462-2920.16076] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Revised: 05/06/2022] [Accepted: 05/16/2022] [Indexed: 01/07/2023]
Abstract
Exposure to particulate matter (PM), a major component of air pollution, is associated with exacerbation of chronic respiratory disease, and infectious diseases such as community-acquired pneumonia. Although PM can cause adverse health effects through direct damage to host cells, our previous study showed that PM can also impact bacterial behaviour by promoting in vivo colonization. In this study we describe the genetic mechanisms involved in the bacterial response to exposure to black carbon (BC), a constituent of PM found in most sources of air pollution. We show that Staphylococcus aureus strain USA300 LAC grown in BC prior to inoculation showed increased murine respiratory tract colonization and pulmonary invasion in vivo, as well as adhesion and invasion of human epithelial cells in vitro. Global transcriptional analysis showed that BC has a widespread effect on S. aureus transcriptional responses, altering the regulation of the major virulence gene regulators Sae and Agr and causing increased expression of genes encoding toxins, proteases and immune evasion factors. Together these data describe a previously unrecognized causative mechanism of air pollution-associated infection, in that exposure to BC can increase bacterial colonization and virulence factor expression by acting directly on the bacterium rather than via the host.
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Affiliation(s)
- Jo Purves
- Department of GeneticsUniversity of Leicester, University RoadLeicesterLE1 7RHUK
| | - Shane J. K. Hussey
- Department of GeneticsUniversity of Leicester, University RoadLeicesterLE1 7RHUK
| | - Louise Corscadden
- Department of GeneticsUniversity of Leicester, University RoadLeicesterLE1 7RHUK
| | - Lillie Purser
- Department of GeneticsUniversity of Leicester, University RoadLeicesterLE1 7RHUK
| | - Andie Hall
- Molecular Biology, Core Research LaboratoriesNatural History MuseumCromwell Road, LondonSW7 5BDUK
| | - Raju Misra
- Molecular Biology, Core Research LaboratoriesNatural History MuseumCromwell Road, LondonSW7 5BDUK
| | - Liza Selley
- MRC Toxicology UnitUniversity of CambridgeCambridgeCB2 1QRUK
| | - Paul S. Monks
- Department of ChemistryUniversity of LeicesterUniversity RoadLeicesterLE1 7RHUK
| | - Julian M. Ketley
- Department of GeneticsUniversity of Leicester, University RoadLeicesterLE1 7RHUK
| | - Peter W. Andrew
- Department of Respiratory SciencesUniversity of LeicesterUniversity Road, LeicesterLE1 9HNUK
| | - Julie A. Morrissey
- Department of GeneticsUniversity of Leicester, University RoadLeicesterLE1 7RHUK
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Air Pollution Increases the Incidence of Upper Respiratory Tract Symptoms among Polish Children. J Clin Med 2021; 10:jcm10102150. [PMID: 34065636 PMCID: PMC8156299 DOI: 10.3390/jcm10102150] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2021] [Revised: 05/10/2021] [Accepted: 05/13/2021] [Indexed: 11/18/2022] Open
Abstract
A substantial proportion of airway disease’s global burden is attributable to exposure to air pollution. This study aimed to investigate the association between air pollution, assessed as concentrations of particulate matter PM2.5 and PM10 on the upper respiratory tract symptoms (URTS) in children. A nation-wide, questionnaire-based study was conducted in Poland in winter 2018/2019 in a population of 1475 children, comparing URTS throughout the study period with publicly available data on airborne particulate matter. A general regression model was used to evaluate the lag effects between daily changes in PM10 and PM2.5 and the number of children reporting URTS and their severity. PM10 and PM2.5 in the single-pollutant models had significant effects on the number of children reporting URTS. The prevalence of URTS: “runny nose”, “sneezing” and “cough” was positively associated with 12-week mean PM2.5 and PM10 concentrations. In the locations with the highest average concentration of PM, the symptoms of runny nose, cough and sneezing were increased by 10%, 9% and 11%, respectively, compared to the cities with the lowest PM concentrations. This study showed that moderate-term exposure (12 week observation period) to air pollution was associated with an increased risk of URTS among children aged 3–12 years in Poland. These findings may influence public debate and future policy at the national and international levels to improve air quality in cities and improve children’s health.
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Lei J, Li Z, Huang X, Li X, Zhang G, Kan H, Chen R, Zhang Y. The Acute Effect of Diesel Exhaust Particles and Different Fractions Exposure on Blood Coagulation Function in Mice. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18084136. [PMID: 33919809 PMCID: PMC8070753 DOI: 10.3390/ijerph18084136] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 03/10/2021] [Accepted: 04/08/2021] [Indexed: 11/27/2022]
Abstract
The toxicity and widespread exposure opportunity of diesel exhaust particles (DEP) has aroused public health concerns. This study aimed to investigate the acute effect of DEP and different fractions exposure on blood coagulation function in mice. In this study, nine- week-old C57BL/6J male mice were divided into four exposure groups (with 15 mice in each group). The water-soluble (WS) and water-insoluble (WIS) fractions of DEP were isolated, and intratracheal instillation was used for DEP, WS and WIS exposure. The phosphate buffer saline (PBS) exposure group was set as the control group. After 24 h exposure, the mice were sacrificed for blood routine, coagulation function and bleeding time examinations to estimate the acute effect of DEP, WS and WIS exposure on the blood coagulation function. In our results, no statistically significant difference in weight of body, brain and lung was observed in different exposure groups. While several core indexes in blood coagulation like bleeding time (BT), fibrinogen (FIB), activated partial thromboplastin time (APTT) and prothrombin time (PT) altered or showed a lower tendency after DEP, WS and WIS exposure. For example, BT was lower In WIS exposure group (211.00 s) compared with PBS exposure group (238.50 s) (p < 0.01), and FIB was lower in WS exposure group (233.00 g/L) compared with PBS exposure group (249.50 g/L) (p < 0.05). Additionally, systemic inflammation-related indexes like white blood cell count (WBC), neutrophil count (NEUT), lymphocyte count (LYMPH) altered after DEP, WS and WIS exposure. In conclusion, DEP, WS and WIS fractions exposure could result in the hypercoagulable state of blood in mice. The noteworthy effects of WS and WIS fractions exposure on blood coagulation function deserve further investigation of the potential mechanism.
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Affiliation(s)
- Jian Lei
- Key Lab of Public Health Safety of the Ministry of Education and NHC Key Laboratory of Health Technology Assessment, School of Public Health, Fudan University, Shanghai 200032, China; (J.L.); (Z.L.); (X.H.); (H.K.); (R.C.)
| | - Zhouzhou Li
- Key Lab of Public Health Safety of the Ministry of Education and NHC Key Laboratory of Health Technology Assessment, School of Public Health, Fudan University, Shanghai 200032, China; (J.L.); (Z.L.); (X.H.); (H.K.); (R.C.)
| | - Xingke Huang
- Key Lab of Public Health Safety of the Ministry of Education and NHC Key Laboratory of Health Technology Assessment, School of Public Health, Fudan University, Shanghai 200032, China; (J.L.); (Z.L.); (X.H.); (H.K.); (R.C.)
| | - Xin Li
- Department of Neurology, Zhongshan Hospital, Fudan University, Shanghai 200032, China; (X.L.); (G.Z.)
| | - Guangzheng Zhang
- Department of Neurology, Zhongshan Hospital, Fudan University, Shanghai 200032, China; (X.L.); (G.Z.)
| | - Haidong Kan
- Key Lab of Public Health Safety of the Ministry of Education and NHC Key Laboratory of Health Technology Assessment, School of Public Health, Fudan University, Shanghai 200032, China; (J.L.); (Z.L.); (X.H.); (H.K.); (R.C.)
| | - Renjie Chen
- Key Lab of Public Health Safety of the Ministry of Education and NHC Key Laboratory of Health Technology Assessment, School of Public Health, Fudan University, Shanghai 200032, China; (J.L.); (Z.L.); (X.H.); (H.K.); (R.C.)
| | - Yuhao Zhang
- Department of Neurology, Zhongshan Hospital, Fudan University, Shanghai 200032, China; (X.L.); (G.Z.)
- National Clinical Research Center for Interventional Medicine, Shanghai 200032, China
- Correspondence:
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Hendryx M, Luo J. COVID-19 prevalence and fatality rates in association with air pollution emission concentrations and emission sources. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 265:115126. [PMID: 32806422 PMCID: PMC7320861 DOI: 10.1016/j.envpol.2020.115126] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 06/25/2020] [Accepted: 06/26/2020] [Indexed: 05/18/2023]
Abstract
The novel coronavirus disease (COVID-19) is primarily respiratory in nature, and as such, there is interest in examining whether air pollution might contribute to disease susceptibility or outcome. We merged data on COVID-19 cumulative prevalence and fatality rates as of May 31, 2020 with 2014-2019 pollution data from the US Environmental Protection Agency Environmental Justice Screen (EJSCREEN), with control for state testing rates, population density, and population covariate data from the County Health Rankings. Pollution data included three types of air emission concentrations (particulate matter<2.5 μm (PM2.5), ozone and diesel particulate matter (DPM)), and four pollution source variables (proximity to traffic, National Priority List sites, Risk Management Plan (RMP) sites, and hazardous waste treatment, storage and disposal facilities (TSDFs)). Results of mixed model linear multiple regression analyses indicated that, controlling for covariates, COVID-19 prevalence and fatality rates were significantly associated with greater DPM. Proximity to TSDFs was associated to greater fatality rates, and proximity to RMPs was associated with greater prevalence rates. Results are consistent with previous research indicating that air pollution increases susceptibility to respiratory viral pathogens. Results should be interpreted cautiously given the ecological design, the time lag between exposure and outcome, and the uncertainties in measuring COVID-19 prevalence. Areas with worse prior air quality, especially higher concentrations of diesel exhaust, may be at greater COVID-19 risk, although further studies are needed to confirm these relationships.
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Affiliation(s)
- Michael Hendryx
- Department of Environmental and Occupational Health, School of Public Health, Indiana University, 1025, E. 7th St., Bloomington, USA.
| | - Juhua Luo
- Department of Epidemiology and Biostatistics, School of Public Health, Indiana University, Bloomington, IN, USA
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Cafferkey J, Coultas JA, Mallia P. Human rhinovirus infection and COPD: role in exacerbations and potential for therapeutic targets. Expert Rev Respir Med 2020; 14:777-789. [PMID: 32498634 DOI: 10.1080/17476348.2020.1764354] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
INTRODUCTION Respiratory virus infections (predominantly rhinoviruses) are the commonly identified in COPD exacerbations but debate about their role as a trigger of exacerbations continues. Experimental infection studies have provided significant new evidence establishing a causal relationship between virus infection and COPD exacerbations and contributed to a better understanding of the mechanisms of virus-induced exacerbations. However as yet no anti-viral treatments have undergone clinical trials in COPD patients. AREAS COVERED This review discusses the evidence for and against respiratory viruses being the main trigger of COPD exacerbations from both epidemiological studies and experimental infection studies. The host immune response to rhinovirus infection and how abnormalities in host immunity may underlie increased susceptibility to virus infection in COPD are discussed and the role of dual viral-bacterial infection in COPD exacerbations. Finally the current state of anti-viral therapy is discussed and how these may be used in the future treatment of COPD exacerbations. EXPERT OPINION Respiratory virus infections are the trigger of a substantial proportion of COPD exacerbations and rhinoviruses are the most common virus type. Clinical trials of anti-viral agents are needed in COPD patients to determine whether they are effective in virus-induced COPD exacerbations.
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Affiliation(s)
- John Cafferkey
- Department of Respiratory Medicine, Imperial College Healthcare NHS Trust , London, UK
| | | | - Patrick Mallia
- Department of Respiratory Medicine, Imperial College Healthcare NHS Trust , London, UK.,National Heart and Lung Institute, Imperial College London , London, UK
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Ghio AJ, Soukup JM, Dailey LA, Madden MC. Air pollutants disrupt iron homeostasis to impact oxidant generation, biological effects, and tissue injury. Free Radic Biol Med 2020; 151:38-55. [PMID: 32092410 PMCID: PMC8274387 DOI: 10.1016/j.freeradbiomed.2020.02.007] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 01/27/2020] [Accepted: 02/10/2020] [Indexed: 02/07/2023]
Abstract
Air pollutants cause changes in iron homeostasis through: 1) a capacity of the pollutant, or a metabolite(s), to complex/chelate iron from pivotal sites in the cell or 2) an ability of the pollutant to displace iron from pivotal sites in the cell. Through either pathway of disruption in iron homeostasis, metal previously employed in essential cell processes is sequestered after air pollutant exposure. An absolute or functional cell iron deficiency results. If enough iron is lost or is otherwise not available within the cell, cell death ensues. However, prior to death, exposed cells will attempt to reverse the loss of requisite metal. This response of the cell includes increased expression of metal importers (e.g. divalent metal transporter 1). Oxidant generation after exposure to air pollutants includes superoxide production which functions in ferrireduction necessary for cell iron import. Activation of kinases and phosphatases and transcription factors and increased release of pro-inflammatory mediators also result from a cell iron deficiency, absolute or functional, after exposure to air pollutants. Finally, air pollutant exposure culminates in the development of inflammation and fibrosis which is a tissue response to the iron deficiency challenging cell survival. Following the response of increased expression of importers and ferrireduction, activation of kinases and phosphatases and transcription factors, release of pro-inflammatory mediators, and inflammation and fibrosis, cell iron is altered, and a new metal homeostasis is established. This new metal homeostasis includes increased total iron concentrations in cells with metal now at levels sufficient to meet requirements for continued function.
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Affiliation(s)
- Andrew J Ghio
- From the National Health and Environmental Effects Research Laboratory, Environmental Protection Agency, Chapel Hill, NC, USA.
| | - Joleen M Soukup
- From the National Health and Environmental Effects Research Laboratory, Environmental Protection Agency, Chapel Hill, NC, USA
| | - Lisa A Dailey
- From the National Health and Environmental Effects Research Laboratory, Environmental Protection Agency, Chapel Hill, NC, USA
| | - Michael C Madden
- From the National Health and Environmental Effects Research Laboratory, Environmental Protection Agency, Chapel Hill, NC, USA
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Yang SI, Kim HB, Kim HC, Lee SY, Kang MJ, Cho HJ, Yoon J, Jung S, Lee E, Yang HJ, Ahn K, Kim KW, Shin YH, Suh DI, Hong SJ. Particulate matter at third trimester and respiratory infection in infants, modified by GSTM1. Pediatr Pulmonol 2020; 55:245-253. [PMID: 31746563 DOI: 10.1002/ppul.24575] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Accepted: 11/08/2019] [Indexed: 12/18/2022]
Abstract
OBJECTIVES To investigate the association between particulate matter with an aerodynamic diameter of less than 2.5 μm (PM2.5 ) exposure during each trimester of pregnancy and development of lower respiratory tract infections (LRTIs) during the first 3 years of life and whether GSTM1 gene polymorphisms modify these effects. METHODS This study included 1,180 mother-child pairs from the Cohort for Childhood Origin of Asthma and allergic diseases. The PM2.5 levels during pregnancy were estimated by residential address using land-use regression models based on a national monitoring system. A diagnosis of LRTIs was based on a parental report of a physician's diagnosis. Real-time polymerase chain reaction was used for GSTM1 genotyping. RESULTS Higher PM2.5 exposure during the third trimester was associated with LRTIs at 1 year of age (aRR, 1.06; 95% CI, 1.00-1.13). This result did not change after adjusting for PM2.5 exposures during the first and second trimesters (aRR, 1.06; 95% CI, 0.99-1.13). This association was significant after adjusting for PM2.5 exposures during first year of age (aRR, 1.08; 95% CI, 1.02-1.15) and exposures to NO2 and ozone at the third trimester (aRR, 1.07; 95% CI, 1.00-1.16). In addition, PM2.5 exposure during the third trimester increased the risk of LRTIs at 1 year of age in cases with the GSTM1 null genotype (aRR, 1.26; 95% CI, 1.01-1.57; P for interaction .20). CONCLUSION Higher PM2.5 exposure during the third trimester of pregnancy may increase the susceptibility to LRTIs at 1 year of age. This effect is modified by GSTM1 gene polymorphisms.
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Affiliation(s)
- Song-I Yang
- Department of Pediatrics, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, South Korea
| | - Hyo-Bin Kim
- Department of Pediatrics, Inje University Sanggye Paik Hospital, Seoul, South Korea
| | - Hwan-Cheol Kim
- Department of Occupational and Environmental Medicine, Inha University School of Medicine, Incheon, South Korea
| | - So-Yeon Lee
- Department of Pediatrics, Childhood Asthma Atopy Center, Environmental Health Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
| | - Mi-Jin Kang
- Department of Pediatrics, Asan Institute for Life Science, University of Ulsan College of Medicine, Seoul, South Korea
| | - Hyun-Ju Cho
- Department of Pediatrics, International St Mary's Hospital, Catholic Kwandong University, Incheon, South Korea
| | - Jisun Yoon
- Department of Pediatrics, Mediplex Sejong Hospital, Incheon, South Korea
| | - Sungsu Jung
- Department of Pediatrics, Pusan National University Yangsan Hospital, Yangsan, South Korea
| | - Eun Lee
- Department of Pediatrics, Chonnam National University Hospital, Chonnam National University Medical School, Gwangju, South Korea
| | - Hyeon-Jong Yang
- Department of Pediatrics, Soonchunhyang University School of Medicine, Seoul, South Korea
| | - Kangmo Ahn
- Department of Pediatrics, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, South Korea
| | - Kyung Won Kim
- Department of Pediatrics, Severance Children's Hospital, Yonsei University College of Medicine, Seoul, South Korea
| | - Youn Ho Shin
- Department of Pediatrics, CHA Gangnam Medical Center, CHA University School of Medicine, Seoul, South Korea
| | - Dong In Suh
- Department of Pediatrics, Seoul National University College of Medicine, Seoul, South Korea
| | - Soo-Jong Hong
- Department of Pediatrics, Childhood Asthma Atopy Center, Environmental Health Center, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea
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Chau-Etchepare F, Hoerger JL, Kuhn BT, Zeki AA, Haczku A, Louie S, Kenyon NJ, Davis CE, Schivo M. Viruses and non-allergen environmental triggers in asthma. J Investig Med 2019; 67:1029-1041. [PMID: 31352362 PMCID: PMC7428149 DOI: 10.1136/jim-2019-001000] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/20/2019] [Indexed: 12/23/2022]
Abstract
Asthma is a complex inflammatory disease with many triggers. The best understood asthma inflammatory pathways involve signals characterized by peripheral eosinophilia and elevated immunoglobulin E levels (called T2-high or allergic asthma), though other asthma phenotypes exist (eg, T2-low or non-allergic asthma, eosinophilic or neutrophilic-predominant). Common triggers that lead to poor asthma control and exacerbations include respiratory viruses, aeroallergens, house dust, molds, and other organic and inorganic substances. Increasingly recognized non-allergen triggers include tobacco smoke, small particulate matter (eg, PM2.5), and volatile organic compounds. The interaction between respiratory viruses and non-allergen asthma triggers is not well understood, though it is likely a connection exists which may lead to asthma development and/or exacerbations. In this paper we describe common respiratory viruses and non-allergen triggers associated with asthma. In addition, we aim to show the possible interactions, and potential synergy, between viruses and non-allergen triggers. Finally, we introduce a new clinical approach that collects exhaled breath condensates to identify metabolomics associated with viruses and non-allergen triggers that may promote the early management of asthma symptoms.
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Affiliation(s)
- Florence Chau-Etchepare
- Pulmonary, Critical Care, and Sleep Medicine, University of California Davis, Sacramento, California, USA
| | - Joshua L Hoerger
- Internal Medicine, University of California Davis, Sacramento, California, USA
| | - Brooks T Kuhn
- Pulmonary, Critical Care, and Sleep Medicine, University of California Davis, Sacramento, California, USA
| | - Amir A Zeki
- Pulmonary, Critical Care, and Sleep Medicine, University of California Davis, Sacramento, California, USA
- Center for Comparative Respiratory Biology and Medicine, University of California Davis, Davis, California, USA
| | - Angela Haczku
- Pulmonary, Critical Care, and Sleep Medicine, University of California Davis, Sacramento, California, USA
- Center for Comparative Respiratory Biology and Medicine, University of California Davis, Davis, California, USA
| | - Samuel Louie
- Pulmonary, Critical Care, and Sleep Medicine, University of California Davis, Sacramento, California, USA
| | - Nicholas J Kenyon
- Pulmonary, Critical Care, and Sleep Medicine, University of California Davis, Sacramento, California, USA
- Center for Comparative Respiratory Biology and Medicine, University of California Davis, Davis, California, USA
| | - Cristina E Davis
- Mechanical and Aerospace Engineering, University of California Davis, Davis, California, USA
| | - Michael Schivo
- Pulmonary, Critical Care, and Sleep Medicine, University of California Davis, Sacramento, California, USA
- Center for Comparative Respiratory Biology and Medicine, University of California Davis, Davis, California, USA
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10
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A Review of Particulate Number (PN) Emissions from Gasoline Direct Injection (GDI) Engines and Their Control Techniques. ENERGIES 2018. [DOI: 10.3390/en11061417] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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11
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Madsen C, Haberg SE, Magnus MC, Aamodt G, Stigum H, London SJ, Nystad W, Nafstad P. Pregnancy exposure to air pollution and early childhood respiratory health in the Norwegian Mother and Child Cohort Study (MoBa). BMJ Open 2017; 7:e015796. [PMID: 29282255 PMCID: PMC5770814 DOI: 10.1136/bmjopen-2016-015796] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
OBJECTIVES It is unclear whether maternal air pollution exposure during pregnancy induces changes in the developing respiratory system of a child and whether it has consequences for respiratory health in early childhood. We investigated associations between exposure to moderate levels of air pollution during pregnancy and early childhood lower respiratory tract infections (LRTI) and wheezing. METHODS This study used a subgroup of 17 533 participants in the Norwegian Mother and Child Cohort Study. Air pollution levels at residential addresses were estimated using land use regression models, and back-extrapolated to the period of each pregnancy. Information on LRTI and wheezing and lifestyle factors was collected from questionnaires completed by mothers during pregnancy and when the child was 6 and 18 months of age. RESULTS Moderate mean levels of NO2 (13.6 µg/m3, range 0.01-60.4) exposure at residential address during pregnancy were not statistically associated with LRTI and wheezing. No association was found per 10 µg/m3 change in NO2 exposure and LRTI before the age of 6 months (adjusted risk ratio (RR) 0.99; 95% CI 0.84 to 1.17), or between 6 and 18 months of age (adjusted RR 1.05; 95% CI 0.94 to 1.16). Similarly, we found no association per 10 µg/m3 change in NO2 exposure and wheezing between 6 and 18 months of age (adjusted RR 1.02; 95% CI 0.97 to 1.07). CONCLUSIONS There were no statistically significant associations for moderate levels of pregnancy NO2 exposure and respiratory health outcomes during early childhood in overall analyses.
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Affiliation(s)
- Christian Madsen
- Department of Health & Inequality, Norwegian Institute of Public Health, Oslo, Norway
| | - Siri Eldevik Haberg
- Domain for Mental and Physical Health, Norwegian Institute of Public Health, Oslo, Norway
| | - Maria C Magnus
- Department of Noncommunicable Diseases, Norwegian Institute of Public Health, Oslo, Norway
| | - Geir Aamodt
- Department of Landscape Architecture and Spatial Planning, Norwegian University of Life Sciences, As, Norway
| | - Hein Stigum
- Department of Noncommunicable Diseases, Norwegian Institute of Public Health, Oslo, Norway
- Department of Community Medicine and Global Health, Medical Faculty, University of Oslo, Oslo, Norway
| | - Stephanie J London
- Department of Health and Human Services, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina, USA
| | - Wenche Nystad
- Department of Noncommunicable Diseases, Norwegian Institute of Public Health, Oslo, Norway
| | - Per Nafstad
- Department of Noncommunicable Diseases, Norwegian Institute of Public Health, Oslo, Norway
- Department of Community Medicine and Global Health, Medical Faculty, University of Oslo, Oslo, Norway
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12
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Zheng PW, Wang JB, Zhang ZY, Shen P, Chai PF, Li D, Jin MJ, Tang ML, Lu HC, Lin HB, Chen K. Air pollution and hospital visits for acute upper and lower respiratory infections among children in Ningbo, China: A time-series analysis. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:18860-18869. [PMID: 28653196 DOI: 10.1007/s11356-017-9279-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2016] [Accepted: 05/17/2017] [Indexed: 06/07/2023]
Abstract
Acute upper and lower respiratory infections are main causes of mortality and morbidity in children. Air pollution has been recognized as an important contributor to development and exacerbation of respiratory infections. However, few studies are available in China. In this study, we investigated the short-term effect of air pollution on hospital visits for acute upper and lower respiratory infections among children under 15 years in Ningbo, China. Poisson generalized models were used to estimate the associations between air pollution and hospital visits for acute upper and lower respiratory infections adjusted for temporal, seasonal, and meteorological effects. We found that four pollutants (PM2.5, PM10, NO2, and SO2) were significantly associated with hospital visits for acute upper and lower respiratory infections. The effect estimates for acute upper respiratory infections tended to be higher (PM2.5 ER = 3.46, 95% CI 2.18, 4.76; PM10 ER = 2.81, 95% CI 1.93, 3.69; NO2 ER = 11.27, 95% CI 8.70, 13.89; SO2 ER = 15.17, 95% CI 11.29, 19.19). Significant associations for gaseous pollutants (NO2 and SO2) were observed after adjustment for particular matter. Stronger associations were observed among older children and in the cold period. Our study suggested that short-term exposure to outdoor air pollution was associated with hospital visits for acute upper and lower respiratory infections in Ningbo.
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Affiliation(s)
- Pei-Wen Zheng
- Department of Epidemiology and Health Statistics, Zhejiang University School of Public Health, C217 Academic Building, 866 Yuhangtang Road, Xihu District, Hangzhou, Zhejiang, 310058, China
| | - Jian-Bing Wang
- Department of Epidemiology and Health Statistics, Zhejiang University School of Public Health, C217 Academic Building, 866 Yuhangtang Road, Xihu District, Hangzhou, Zhejiang, 310058, China
- Research Center for Air Pollution and Health, Zhejiang University, Hangzhou, Zhejiang, 310058, China
| | - Zhen-Yu Zhang
- John Hopkins School of Public Health, Baltimore, MD, 21218, USA
| | - Peng Shen
- Center for Disease Control and Prevention of Yinzhou District, 1221 Xueshi Road, Ningbo, Zhejiang, 315100, China
| | - Peng-Fei Chai
- Center for Disease Control and Prevention of Yinzhou District, 1221 Xueshi Road, Ningbo, Zhejiang, 315100, China
| | - Die Li
- Department of Epidemiology and Health Statistics, Zhejiang University School of Public Health, C217 Academic Building, 866 Yuhangtang Road, Xihu District, Hangzhou, Zhejiang, 310058, China
| | - Ming-Juan Jin
- Department of Epidemiology and Health Statistics, Zhejiang University School of Public Health, C217 Academic Building, 866 Yuhangtang Road, Xihu District, Hangzhou, Zhejiang, 310058, China
| | - Meng-Ling Tang
- Department of Epidemiology and Health Statistics, Zhejiang University School of Public Health, C217 Academic Building, 866 Yuhangtang Road, Xihu District, Hangzhou, Zhejiang, 310058, China
| | - Huai-Chu Lu
- Center for Disease Control and Prevention of Yinzhou District, 1221 Xueshi Road, Ningbo, Zhejiang, 315100, China
| | - Hong-Bo Lin
- Center for Disease Control and Prevention of Yinzhou District, 1221 Xueshi Road, Ningbo, Zhejiang, 315100, China.
| | - Kun Chen
- Department of Epidemiology and Health Statistics, Zhejiang University School of Public Health, C217 Academic Building, 866 Yuhangtang Road, Xihu District, Hangzhou, Zhejiang, 310058, China.
- Research Center for Air Pollution and Health, Zhejiang University, Hangzhou, Zhejiang, 310058, China.
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Satish S, Swanson JJ, Xiao K, Viner AS, Kittelson DB, Pui DYH. Gravimetric Measurements of Filtering Facepiece Respirators Challenged With Diesel Exhaust. Ann Work Expo Health 2017; 61:737-747. [DOI: 10.1093/annweh/wxx044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2017] [Accepted: 05/24/2017] [Indexed: 11/12/2022] Open
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Niranjan R, Thakur AK. The Toxicological Mechanisms of Environmental Soot (Black Carbon) and Carbon Black: Focus on Oxidative Stress and Inflammatory Pathways. Front Immunol 2017; 8:763. [PMID: 28713383 PMCID: PMC5492873 DOI: 10.3389/fimmu.2017.00763] [Citation(s) in RCA: 125] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2017] [Accepted: 06/16/2017] [Indexed: 12/29/2022] Open
Abstract
The environmental soot and carbon blacks (CBs) cause many diseases in humans, but their underlying mechanisms of toxicity are still poorly understood. Both are formed after the incomplete combustion of hydrocarbons but differ in their constituents and percent carbon contents. For the first time, “Sir Percival Pott” described soot as a carcinogen, which was subsequently confirmed by many others. The existing data suggest three main types of diseases due to soot and CB exposures: cancer, respiratory diseases, and cardiovascular dysfunctions. Experimental models revealed the involvement of oxidative stress, DNA methylation, formation of DNA adducts, and Aryl hydrocarbon receptor activation as the key mechanisms of soot- and CB-induced cancers. Metals including Si, Fe, Mn, Ti, and Co in soot also contribute in the reactive oxygen species (ROS)-mediated DNA damage. Mechanistically, ROS-induced DNA damage is further enhanced by eosinophils and neutrophils via halide (Cl− and Br−) dependent DNA adducts formation. The activation of pulmonary dendritic cells, T helper type 2 cells, and mast cells is crucial mediators in the pathology of soot- or CB-induced respiratory disease. Polyunsaturated fatty acids (PUFAs) were also found to modulate T cells functions in respiratory diseases. Particularly, telomerase reverse transcriptase was found to play the critical role in soot- and CB-induced cardiovascular dysfunctions. In this review, we propose integrated mechanisms of soot- and CB-induced toxicity emphasizing the role of inflammatory mediators and oxidative stress. We also suggest use of antioxidants and PUFAs as protective strategies against soot- and CB-induced disorders.
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Affiliation(s)
- Rituraj Niranjan
- Department of Biological Sciences and Bioengineering (BSBE), Indian Institute of Technology Kanpur, Kanpur, India
| | - Ashwani Kumar Thakur
- Department of Biological Sciences and Bioengineering (BSBE), Indian Institute of Technology Kanpur, Kanpur, India
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15
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Farris BY, Antonini JM, Fedan JS, Mercer RR, Roach KA, Chen BT, Schwegler-Berry D, Kashon ML, Barger MW, Roberts JR. Pulmonary toxicity following acute coexposures to diesel particulate matter and α-quartz crystalline silica in the Sprague-Dawley rat. Inhal Toxicol 2017; 29:322-339. [PMID: 28967277 PMCID: PMC6545482 DOI: 10.1080/08958378.2017.1361487] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
The effects of acute pulmonary coexposures to silica and diesel particulate matter (DPM), which may occur in various mining operations, were investigated in vivo. Rats were exposed by intratracheal instillation (IT) to silica (50 or 233 µg), DPM (7.89 or 50 µg) or silica and DPM combined in phosphate-buffered saline (PBS) or to PBS alone (control). At one day, one week, one month, two months and three months postexposure bronchoalveolar lavage and histopathology were performed to assess lung injury, inflammation and immune response. While higher doses of silica caused inflammation and injury at all time points, DPM exposure alone did not. DPM (50 µg) combined with silica (233 µg) increased inflammation at one week and one-month postexposure and caused an increase in the incidence of fibrosis at one month compared with exposure to silica alone. To assess susceptibility to lung infection following coexposure, rats were exposed by IT to 233 µg silica, 50 µg DPM, a combination of the two or PBS control one week before intratracheal inoculation with 5 × 105 Listeria monocytogenes. At 1, 3, 5, 7 and 14 days following infection, pulmonary immune response and bacterial clearance from the lung were evaluated. Coexposure to DPM and silica did not alter bacterial clearance from the lung compared to control. Although DPM and silica coexposure did not alter pulmonary susceptibility to infection in this model, the study showed that noninflammatory doses of DPM had the capacity to increase silica-induced lung injury, inflammation and onset/incidence of fibrosis.
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Affiliation(s)
- Breanne Y. Farris
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
- School of Medicine, West Virginia University, Morgantown, WV, USA
| | - James M. Antonini
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
- School of Pharmacy, West Virginia University, Morgantown, WV, USA
| | - Jeffrey S. Fedan
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
- School of Medicine, West Virginia University, Morgantown, WV, USA
- School of Pharmacy, West Virginia University, Morgantown, WV, USA
| | - Robert R. Mercer
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - Katherine A. Roach
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
- School of Pharmacy, West Virginia University, Morgantown, WV, USA
| | - Bean T. Chen
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | | | - Michael L. Kashon
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - Mark W. Barger
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
| | - Jenny R. Roberts
- National Institute for Occupational Safety and Health, Morgantown, WV, USA
- School of Medicine, West Virginia University, Morgantown, WV, USA
- School of Pharmacy, West Virginia University, Morgantown, WV, USA
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16
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Zhang X, Xiao X, Duan H, Gao F, Li Y, Niu Y, Gao W, Wang H, Yu S, Zheng Y. Cytotoxicity of diesel engine exhaust among the Chinese occupational population: a complement of cytokinesis-block micronucleus cytome. Inhal Toxicol 2016; 28:274-80. [DOI: 10.3109/08958378.2016.1162233] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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17
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Ni L, Chuang CC, Zuo L. Fine particulate matter in acute exacerbation of COPD. Front Physiol 2015; 6:294. [PMID: 26557095 PMCID: PMC4617054 DOI: 10.3389/fphys.2015.00294] [Citation(s) in RCA: 107] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Accepted: 10/05/2015] [Indexed: 12/17/2022] Open
Abstract
Chronic obstructive pulmonary disease (COPD) is a common airway disorder. In particular, acute exacerbations of COPD (AECOPD) can significantly reduce pulmonary function. The majority of AECOPD episodes are attributed to infections, although environmental stress also plays a role. Increasing urbanization and associated air pollution, especially in developing countries, have been shown to contribute to COPD pathogenesis. Elevated levels of particulate matter (PM) in polluted air are strongly correlated with the onset and development of various respiratory diseases. In this review, we have conducted an extensive literature search of recent studies of the role of PM2.5 (fine PM) in AECOPD. PM2.5 leads to AECOPD via inflammation, oxidative stress (OS), immune dysfunction, and altered airway epithelial structure and microbiome. Reducing PM2.5 levels is a viable approach to lower AECOPD incidence, attenuate COPD progression and decrease the associated healthcare burden.
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Affiliation(s)
- Lei Ni
- Radiologic Sciences and Respiratory Therapy Division, School of Health and Rehabilitation Sciences, Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, The Ohio State University Wexner Medical Center Columbus, OH, USA ; Department of Pulmonary Medicine, Ruijin Hospital, School of Medicine, Shanghai Jiao Tong University Shanghai, China ; Shanghai Key Laboratory of Meteorology and Health, Pudong Meteorological Service Shanghai, China
| | - Chia-Chen Chuang
- Radiologic Sciences and Respiratory Therapy Division, School of Health and Rehabilitation Sciences, Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, The Ohio State University Wexner Medical Center Columbus, OH, USA ; Interdisciplinary Biophysics Program, The Ohio State University Columbus, OH, USA
| | - Li Zuo
- Radiologic Sciences and Respiratory Therapy Division, School of Health and Rehabilitation Sciences, Davis Heart and Lung Research Institute, The Ohio State University College of Medicine, The Ohio State University Wexner Medical Center Columbus, OH, USA ; Interdisciplinary Biophysics Program, The Ohio State University Columbus, OH, USA
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18
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van Berlo D, Hullmann M, Schins RPF. Toxicology of ambient particulate matter. ACTA ACUST UNITED AC 2015; 101:165-217. [PMID: 22945570 DOI: 10.1007/978-3-7643-8340-4_7] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
It is becoming increasingly clear that inhalation exposure to particulate matter (PM) can lead to or exacerbate various diseases, which are not limited to the lung but extend to the cardiovascular system and possibly other organs and tissues. Epidemiological studies have provided strong evidence for associations with chronic obstructive pulmonary disease (COPD), asthma, bronchitis and cardiovascular disease, while the evidence for a link with lung cancer is less strong. Novel research has provided first hints that exposure to PM might lead to diabetes and central nervous system (CNS) pathology. In the current review, an overview is presented of the toxicological basis for adverse health effects that have been linked to PM inhalation. Oxidative stress and inflammation are discussed as central processes driving adverse effects; in addition, profibrotic and allergic processes are implicated in PM-related diseases. Effects of PM on key cell types considered as regulators of inflammatory, fibrotic and allergic mechanisms are described.
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Affiliation(s)
- Damiën van Berlo
- Particle Research, Institut für Umweltmedizinische Forschung (IUF), Heinrich-Heine University Düsseldorf, Auf'm Hennekamp 50, 40225, Düsseldorf, Germany
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19
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Kelly MS, Wirth KE, Madrigano J, Feemster KA, Cunningham CK, Arscott-Mills T, Boiditswe S, Shah SS, Finalle R, Steenhoff AP. The effect of exposure to wood smoke on outcomes of childhood pneumonia in Botswana. Int J Tuberc Lung Dis 2015; 19:349-55. [PMID: 25686146 PMCID: PMC4352146 DOI: 10.5588/ijtld.14.0557] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
SETTING Tertiary hospital in Gaborone, Botswana. OBJECTIVE To examine whether exposure to wood smoke worsens outcomes of childhood pneumonia. DESIGN Prospective cohort study of children aged 1-23 months meeting clinical criteria for pneumonia. Household use of wood as a cooking fuel was assessed during a face-to-face questionnaire with care givers. We estimated crude and adjusted risk ratios (RRs) and 95% confidence intervals (CIs) for treatment failure at 48 h by household use of wood as a cooking fuel. We assessed for effect modification by age (1-5 vs. 6-23 months) and malnutrition (none vs. moderate vs. severe). RESULTS The median age of the 284 enrolled children was 5.9 months; 17% had moderate or severe malnutrition. Ninety-nine (35%) children failed treatment at 48 h and 17 (6%) died. In multivariable analyses, household use of wood as a cooking fuel increased the risk of treatment failure at 48 h (RR 1.44, 95%CI 1.09-1.92, P = 0.01). This association differed by child nutritional status (P = 0.02), with a detrimental effect observed only among children with no or moderate malnutrition. CONCLUSIONS Exposure to wood smoke worsens outcomes for childhood pneumonia. Efforts to prevent exposure to smoke from unprocessed fuels may improve pneumonia outcomes among children.
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Affiliation(s)
- Matthew S. Kelly
- Botswana-UPenn Partnership, Gaborone, Botswana
- Global Health Center, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Division of Pediatric Infectious Diseases, Duke University Medical Center, Durham, North Carolina, USA
| | - Kathleen E. Wirth
- Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts, USA
| | - Jaime Madrigano
- Department of Environmental and Occupational Health, Rutgers School of Public Health, Piscataway, New Jersey, USA
| | - Kristen A. Feemster
- Global Health Center, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Division of Infectious Diseases, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Coleen K. Cunningham
- Division of Pediatric Infectious Diseases, Duke University Medical Center, Durham, North Carolina, USA
| | - Tonya Arscott-Mills
- Botswana-UPenn Partnership, Gaborone, Botswana
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | | | - Samir S. Shah
- Divisions of Hospital Medicine and Infectious Diseases, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA
| | - Rodney Finalle
- Global Health Center, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Andrew P. Steenhoff
- Botswana-UPenn Partnership, Gaborone, Botswana
- Global Health Center, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Division of Infectious Diseases, The Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA
- Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
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20
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Rice MB, Rifas-Shiman SL, Oken E, Gillman MW, Ljungman PL, Litonjua AA, Schwartz J, Coull BA, Zanobetti A, Koutrakis P, Melly SJ, Mittleman MA, Gold DR. Exposure to traffic and early life respiratory infection: A cohort study. Pediatr Pulmonol 2015; 50:252-259. [PMID: 24678045 PMCID: PMC4177521 DOI: 10.1002/ppul.23029] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 01/29/2014] [Indexed: 11/08/2022]
Abstract
We examined whether proximity to a major roadway and traffic density around the home during pregnancy are associated with risk of early life respiratory infection in a pre-birth cohort in the Boston area. We geocoded addresses for 1,263 mother-child pairs enrolled during the first trimester of pregnancy in Project Viva during 1999-2002. We calculated distance from home to nearest major roadway and traffic density in a 100 m buffer around the home. We defined respiratory infection as maternal report of ≥1 doctor-diagnosed pneumonia, bronchiolitis, croup, or other respiratory infection from birth until the early childhood visit (median age 3.3). We used relative risk regression models adjusting for potential confounders to estimate associations between traffic exposures and risk of respiratory infection. Distance to roadway during pregnancy was associated with risk of respiratory infection. In fully adjusted models, relative risks (95% CI) for respiratory infection were: 1.30 (1.08, 1.55) for <100 m, 1.15 (0.93, 1.41) for 100 to <200 m, and 0.95 (0.84, 1.07) for 200 to <1,000 m compared with living ≥1,000 m away from a major roadway. Each interquartile range increase in distance to roadway was associated with an 8% (95% CI 0.87, 0.98) lower risk, and each interquartile range increase in traffic density was associated with a 5% (95% CI 0.98, 1.13) higher risk of respiratory infection. Our findings suggest that living close to a major roadway during pregnancy may predispose the developing lung to infection in early life. Pediatr Pulmonol. 2015; 50:252-259. © 2014 Wiley Periodicals, Inc.
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Affiliation(s)
- Mary B Rice
- Pulmonary and Critical Care Unit, Massachusetts General Hospital, Boston, Massachusetts.,Cardiovascular Epidemiology Research Unit, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts
| | - Sheryl L Rifas-Shiman
- Obesity Prevention Program, Department of Population Medicine, Harvard Medical School/Harvard Pilgrim Health Care Institute, Boston, Massachsetts
| | - Emily Oken
- Obesity Prevention Program, Department of Population Medicine, Harvard Medical School/Harvard Pilgrim Health Care Institute, Boston, Massachsetts
| | - Matthew W Gillman
- Obesity Prevention Program, Department of Population Medicine, Harvard Medical School/Harvard Pilgrim Health Care Institute, Boston, Massachsetts
| | - Petter L Ljungman
- Cardiovascular Epidemiology Research Unit, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts
| | - Augusto A Litonjua
- Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts
| | - Joel Schwartz
- Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts
| | - Brent A Coull
- Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts
| | - Antonella Zanobetti
- Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts
| | - Petros Koutrakis
- Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts
| | - Steven J Melly
- Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts
| | - Murray A Mittleman
- Cardiovascular Epidemiology Research Unit, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Massachusetts
| | - Diane R Gold
- Channing Laboratory, Department of Medicine, Brigham and Women's Hospital, Boston, Massachusetts.,Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts
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21
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Darrow LA, Klein M, Flanders WD, Mulholland JA, Tolbert PE, Strickland MJ. Air pollution and acute respiratory infections among children 0-4 years of age: an 18-year time-series study. Am J Epidemiol 2014; 180:968-77. [PMID: 25324558 DOI: 10.1093/aje/kwu234] [Citation(s) in RCA: 179] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Upper and lower respiratory infections are common in early childhood and may be exacerbated by air pollution. We investigated short-term changes in ambient air pollutant concentrations, including speciated particulate matter less than 2.5 μm in diameter (PM2.5), in relation to emergency department (ED) visits for respiratory infections in young children. Daily counts of ED visits for bronchitis and bronchiolitis (n = 80,399), pneumonia (n = 63,359), and upper respiratory infection (URI) (n = 359,246) among children 0-4 years of age were collected from hospitals in the Atlanta, Georgia, area for the period 1993-2010. Daily pollutant measurements were combined across monitoring stations using population weighting. In Poisson generalized linear models, 3-day moving average concentrations of ozone, nitrogen dioxide, and the organic carbon fraction of particulate matter less than 2.5 μm in diameter (PM2.5) were associated with ED visits for pneumonia and URI. Ozone associations were strongest and were observed at low (cold-season) concentrations; a 1-interquartile range increase predicted a 4% increase (95% confidence interval: 2%, 6%) in visits for URI and an 8% increase (95% confidence interval: 4%, 13%) in visits for pneumonia. Rate ratios tended to be higher in the 1- to 4-year age group compared with infants. Results suggest that primary traffic pollutants, ozone, and the organic carbon fraction of PM2.5 exacerbate upper and lower respiratory infections in early life, and that the carbon fraction of PM2.5 is a particularly harmful component of the ambient particulate matter mixture.
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22
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Zhang X, Duan H, Gao F, Li Y, Huang C, Niu Y, Gao W, Yu S, Zheng Y. Increased micronucleus, nucleoplasmic bridge, and nuclear bud frequencies in the peripheral blood lymphocytes of diesel engine exhaust-exposed workers. Toxicol Sci 2014; 143:408-17. [PMID: 25370840 DOI: 10.1093/toxsci/kfu239] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The International Agency for Research on Cancer has recently reclassified diesel engine exhaust (DEE) as a Group 1 carcinogen. Micronucleus (MN), nucleoplasmic bridge (NPB), and nuclear bud (NBUD) frequencies in peripheral blood lymphocytes (PBLs) are associated with cancer risk. However, the impact of DEE exposure on MN frequency has not been thoroughly elucidated due to mixed exposure and its impact on NPB and NBUD frequencies has never been explored in humans. We recruited 117 diesel engine testing workers with exclusive exposure to DEE and 112 non-DEE-exposed workers, and then we measured urinary levels of 4 mono-hydroxylated polycyclic aromatic hydrocarbons (OH-PAHs) using high-performance liquid chromatography-mass spectrometry as well as MN, NPB, and NBUD frequencies in PBLs using cytokinesis-block MN assay. The DEE-exposed workers exhibited significantly higher MN, NPB, and NBUD frequencies than the non-DEE-exposed workers (P < 0.05). Among all study subjects, increasing levels of all 4 urinary OH-PAHs, on both quartile and continuous scales, were associated with increased MN, NPB, and NBUD frequencies (all P < 0.05). When the associations were analyzed separately in DEE-exposed and non-DEE-exposed workers, we found that the association between increasing quartiles of urinary 9-hydroxyphenanthrene (9-OHPh) and MN frequencies persisted in DEE-exposed workers (P = 0.001). The percent of MN frequencies increased, on average, by 23.99% (95% confidential interval, 9.64-39.93) per 1-unit increase in ln-transformed 9-OHPh. Our results clearly show that exposure to DEE can induce increases in MN, NPB, and NBUD frequencies in PBLs and suggest that DEE exposure level is associated with MN frequencies.
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Affiliation(s)
- Xiao Zhang
- *Key Laboratory of Chemical Safety and Health, National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, 29 Nanwei Road, Beijing 100050, China, Faculty of Preventive Medicine, School of Public Health, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China, Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, 1207 Gilbert Drive, Lubbock, TX 79416, USA, and Henan Institute of Occupational Medicine, Kangfuxi Street, Zhengzhou 450052, China
| | - Huawei Duan
- *Key Laboratory of Chemical Safety and Health, National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, 29 Nanwei Road, Beijing 100050, China, Faculty of Preventive Medicine, School of Public Health, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China, Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, 1207 Gilbert Drive, Lubbock, TX 79416, USA, and Henan Institute of Occupational Medicine, Kangfuxi Street, Zhengzhou 450052, China
| | - Feng Gao
- *Key Laboratory of Chemical Safety and Health, National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, 29 Nanwei Road, Beijing 100050, China, Faculty of Preventive Medicine, School of Public Health, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China, Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, 1207 Gilbert Drive, Lubbock, TX 79416, USA, and Henan Institute of Occupational Medicine, Kangfuxi Street, Zhengzhou 450052, China
| | - Yuanyuan Li
- *Key Laboratory of Chemical Safety and Health, National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, 29 Nanwei Road, Beijing 100050, China, Faculty of Preventive Medicine, School of Public Health, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China, Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, 1207 Gilbert Drive, Lubbock, TX 79416, USA, and Henan Institute of Occupational Medicine, Kangfuxi Street, Zhengzhou 450052, China
| | - Chuanfeng Huang
- *Key Laboratory of Chemical Safety and Health, National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, 29 Nanwei Road, Beijing 100050, China, Faculty of Preventive Medicine, School of Public Health, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China, Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, 1207 Gilbert Drive, Lubbock, TX 79416, USA, and Henan Institute of Occupational Medicine, Kangfuxi Street, Zhengzhou 450052, China
| | - Yong Niu
- *Key Laboratory of Chemical Safety and Health, National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, 29 Nanwei Road, Beijing 100050, China, Faculty of Preventive Medicine, School of Public Health, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China, Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, 1207 Gilbert Drive, Lubbock, TX 79416, USA, and Henan Institute of Occupational Medicine, Kangfuxi Street, Zhengzhou 450052, China
| | - Weimin Gao
- *Key Laboratory of Chemical Safety and Health, National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, 29 Nanwei Road, Beijing 100050, China, Faculty of Preventive Medicine, School of Public Health, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China, Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, 1207 Gilbert Drive, Lubbock, TX 79416, USA, and Henan Institute of Occupational Medicine, Kangfuxi Street, Zhengzhou 450052, China
| | - Shanfa Yu
- *Key Laboratory of Chemical Safety and Health, National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, 29 Nanwei Road, Beijing 100050, China, Faculty of Preventive Medicine, School of Public Health, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China, Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, 1207 Gilbert Drive, Lubbock, TX 79416, USA, and Henan Institute of Occupational Medicine, Kangfuxi Street, Zhengzhou 450052, China
| | - Yuxin Zheng
- *Key Laboratory of Chemical Safety and Health, National Institute for Occupational Health and Poison Control, Chinese Center for Disease Control and Prevention, 29 Nanwei Road, Beijing 100050, China, Faculty of Preventive Medicine, School of Public Health, Sun Yat-sen University, 74 Zhongshan Road 2, Guangzhou 510080, China, Department of Environmental Toxicology, The Institute of Environmental and Human Health, Texas Tech University, 1207 Gilbert Drive, Lubbock, TX 79416, USA, and Henan Institute of Occupational Medicine, Kangfuxi Street, Zhengzhou 450052, China
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Walling BE, Lau GW. Perturbation of pulmonary immune functions by carbon nanotubes and susceptibility to microbial infection. J Microbiol 2014; 52:227-34. [PMID: 24585053 DOI: 10.1007/s12275-014-3695-y] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2013] [Accepted: 01/21/2014] [Indexed: 12/13/2022]
Abstract
Occupational and environmental pulmonary exposure to carbon nanotubes (CNT) is considered to be a health risk with a very low threshold of tolerance as determined by the United States Center for Disease Control. Immortalized airway epithelial cells exposed to CNTs show a diverse range of effects including reduced viability, impaired proliferation, and elevated reactive oxygen species generation. Additionally, CNTs inhibit internalization of targets in multiple macrophage cell lines. Mice and rats exposed to CNTs often develop pulmonary granulomas and fibrosis. Furthermore, CNTs have immunomodulatory properties in these animal models. CNTs themselves are proinflammatory and can exacerbate the allergic response. However, CNTs may also be immunosuppressive, both locally and systemically. Studies that examined the relationship of CNT exposure prior to pulmonary infection have reached different conclusions. In some cases, pre-exposure either had no effect or enhanced clearance of infections while other studies showed CNTs inhibited clearance. Interestingly, most studies exploring this relationship use pathogens which are not considered primary pulmonary pathogens. Moreover, harmony across studies is difficult as different types of CNTs have dissimilar biological effects. We used Pseudomonas aeruginosa as model pathogen to study how helical multi-walled carbon nanotubes (HCNTs) affected internalization and clearance of the pulmonary pathogen. The results showed that, although HCNTs can inhibit internalization through multiple processes, bacterial clearance was not altered, which was attributed to an enhanced inflammatory response caused by pre-exposure to HCNTs. We compare and contrast our findings in relation to other studies to gauge the modulation of pulmonary immune response by CNTs.
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Affiliation(s)
- Brent E Walling
- Department of Pathobiology, University of Illinois at Urbana-Champaign, Urbana, IL, 61802, USA
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24
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Abstract
Particle exposures increase the risk for human infections. Particles can deposit in the nose, pharynx, larynx, trachea, bronchi, and distal lung and, accordingly, the respiratory tract is the system most frequently infected after such exposure; however, meningitis also occurs. Cigarette smoking, burning of biomass, dust storms, mining, agricultural work, environmental tobacco smoke (ETS), wood stoves, traffic-related emissions, gas stoves, and ambient air pollution are all particle-related exposures associated with an increased risk for respiratory infections. In addition, cigarette smoking, burning of biomass, dust storms, mining, and ETS can result in an elevated risk for tuberculosis, atypical mycobacterial infections, and meningitis. One of the mechanisms for particle-related infections includes an accumulation of iron by surface functional groups of particulate matter (PM). Since elevations in metal availability are common to every particle exposure, all PM potentially contributes to these infections. Therefore, exposures to wood stove emissions, diesel exhaust, and air pollution particles are predicted to increase the incidence and prevalence of tuberculosis, atypical mycobacterial infections, and meningitis, albeit these elevations are likely to be small and detectable only in large population studies. Since iron accumulation correlates with the presence of surface functional groups and dependent metal coordination by the PM, the risk for infection continues as long as the particle is retained. Subsequently, it is expected that the cessation of exposure will diminish, but not totally reverse, the elevated risk for infection.
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Affiliation(s)
- A J Ghio
- National Health and Environmental Effects Research Laboratory, US EPA, Research Triangle Park, NC, 27711, USA,
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25
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McIntosh-Kastrinsky R, Diaz-Sanchez D, Sexton KG, Jania CM, Zavala J, Tilley SL, Jaspers I, Gilmour MI, Devlin RB, Cascio WE, Tong H. Photochemically altered air pollution mixtures and contractile parameters in isolated murine hearts before and after ischemia. ENVIRONMENTAL HEALTH PERSPECTIVES 2013; 121:1344-8. [PMID: 24148996 PMCID: PMC3855513 DOI: 10.1289/ehp.1306609] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/04/2013] [Accepted: 10/17/2013] [Indexed: 05/16/2023]
Abstract
BACKGROUND The cardiopulmonary effects of the individual criteria air pollutants have been well investigated, but little is known about the cardiopulmonary effects of inhaled multipollutant mixtures that more realistically represent environmental exposures. OBJECTIVES We assessed the cardiopulmonary effects of exposure to photochemically altered particle-free multipollutant mixtures. METHODS We exposed mice to filtered air (FA), multipollutant mixtures, or ozone (O3) for 4 hr in a photochemical reaction chamber. Eight hours after exposure, we assessed cardiac responses using a Langendorff preparation in a protocol consisting of 20 min of global ischemia followed by 2 hr of reperfusion. Cardiac function was assessed by measuring the index of left-ventricular developed pressure (LVDP) and contractility (dP/dt) before ischemia. On reperfusion after ischemia, recovery of postischemic LVDP and size of infarct were examined. We used bronchoalveolar lavage (BAL) cell counts to assess lung inflammation. RESULTS Exposure to the multipollutant mixtures decreased LVDP, baseline rate of left ventricular contraction (dP/dtmaximum), and baseline rate of left ventricular relaxation (dP/dtminimum) compared with exposure to FA. Exposure to O3 also decreased heart rate and dP/dtminimum. Time to ischemic contracture was prolonged in the multipollutant-mixture group relative to that in the FA group. Mice in the multipollutant-mixture group had better recovery of postischemic LVDP and smaller infarct size. Exposure to multipollutant mixtures and to O3 exposure increased numbers of macrophages in the BAL fluid. CONCLUSIONS Exposure to photochemically altered urban air pollution appears to affect cardiac mechanics in isolated perfused hearts. Inhalation of acute multipollutant mixtures decreases LVDP and cardiac contractility in isolated non-ischemic murine hearts, prolongs ischemic contracture, increases postischemic recovery of LVDP, and reduces infarct size.
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Affiliation(s)
- Rachel McIntosh-Kastrinsky
- Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
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26
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He X, Reponen T, McKay RT, Grinshpun SA. Effect of Particle Size on the Performance of an N95 Filtering Facepiece Respirator and a Surgical Mask at Various Breathing Conditions. AEROSOL SCIENCE AND TECHNOLOGY : THE JOURNAL OF THE AMERICAN ASSOCIATION FOR AEROSOL RESEARCH 2013; 47:1180-1187. [PMID: 31548759 PMCID: PMC6756464 DOI: 10.1080/02786826.2013.829209] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The effect of aerosol particle size on the performance of an N95 filtering facepiece respirator (FFR) and a surgical mask (SM) was evaluated under different breathing conditions, including breathing frequency and mean inspiratory flow (MIF) rate. The FFR and SM were sealed on a manikin headform and challenged with charge-equilibrated NaCl aerosol. Filter penetration (Pfilter) was determined as the ratio of aerosol concentrations inside and outside the FFR/SM size-selectively (28 channels) within a range of 20 to 500 nm. In addition, the same models of the FFR and SM were donned, but not sealed, on an advanced manikin headform covered with skin-like material. Total inward leakage (TIL), which represents the total particle penetration, was measured under conditions identical to the filter penetration experiment. Testing was conducted at four mean MIFs (15, 30, 55 and 85 L/min) combined with five breathing frequencies (10, 15, 20, 25 and 30 breaths/min). The results show that SM produced much higher Pfilter and TIL values, and thus provide little protection against aerosols in the size range tested. Pfilter was significantly affected by particle size and breathing flow rate (p <0.05) for the tested FFR and SM. Surprisingly, for both devices, Pfilter as a function of the particle size exhibited more than one peak under all tested breathing conditions. The effect of breathing frequency on Pfilter was generally less pronounced, especially for lower MIFs. For the FFR and SM, TIL increased with increasing particle size up to about 50 nm; for particles above 50 nm, the total penetration was not significantly affected by particle size and breathing frequency; however, the effect of MIF remained significant.
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Affiliation(s)
- Xinjian He
- Center for Health-Related Aerosol Studies, Department of Environmental Health, University of Cincinnati, Cincinnati, OH
| | - Tiina Reponen
- Center for Health-Related Aerosol Studies, Department of Environmental Health, University of Cincinnati, Cincinnati, OH
| | - Roy T McKay
- Center for Health-Related Aerosol Studies, Department of Environmental Health, University of Cincinnati, Cincinnati, OH
| | - Sergey A Grinshpun
- Center for Health-Related Aerosol Studies, Department of Environmental Health, University of Cincinnati, Cincinnati, OH
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27
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Migliaccio CT, Kobos E, King QO, Porter V, Jessop F, Ward T. Adverse effects of wood smoke PM(2.5) exposure on macrophage functions. Inhal Toxicol 2013; 25:67-76. [PMID: 23363038 DOI: 10.3109/08958378.2012.756086] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Epidemiological studies have shown a correlation between chronic biomass smoke exposure and increased respiratory infection. Pulmonary macrophages are instrumental in both the innate and the adaptive immune responses to respiratory infection. In the present study, in vitro systems were utilized where alveolar macrophages (AM) and bone marrow-derived macrophages (BMdM) were exposed to concentrated wood smoke-derived particulate matter (WS-PM) and mice were exposed in vivo to either concentrated WS-PM or inhaled WS. In vivo studies demonstrated that WS-exposed mice inoculated with Streptococcus pneumoniae had a higher bacterial load 24 h post-exposure, and corresponding AM were found to have decreased lymphocyte activation activity. Additionally, while classic markers of inflammation (cellular infiltration, total protein, neutrophils) were not affected, there were changes in pulmonary macrophages populations, including significant decreases in macrophages expressing markers of activation in WS-exposed mice. The lymphocyte activation activity of WS-PM-exposed AM was significantly suppressed, but the phagocytic activity appeared unchanged. In an effort to determine a pathway for WS-induced suppression, RelB activation, assessed by nuclear translocation, was observed in AM exposed to either inhaled WS or instilled WS-PM. Finally, an analysis of WS-PM fractions determined the presence of 4-5 polycyclic aromatic hydrocarbons (PAHs), and preliminary work suggests a potential role for these PAHs to alter macrophage functions. These studies show a decreased ability of WS-exposed pulmonary macrophages to effectively mount a defense against infection, the effect lasts at least a week post-exposure, and appears to be mediated via RelB activation.
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28
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Luo L, Hong X, Chen C, Brooks SP, Song Y. Identification of pathology from diesel exhaust particles in the bladder in a rat model by aspiration of particles from the pharynx. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2013; 35:380-387. [PMID: 23467115 DOI: 10.1016/j.etap.2013.01.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Revised: 01/19/2013] [Accepted: 01/25/2013] [Indexed: 06/01/2023]
Abstract
To determine whether diesel exhaust particles (DEPs) could be a toxic agent to the bladder, rats were exposed to different concentrations of DEPs for one month or three months. When the rats were sacrificed, morphologic changes of the urothelium were investigated. The antioxidase activity and the levels of lipid peroxidation in the bladder were assayed. In the three-month group, DEPs at doses of 21.03 μg/μl insulted the structural integrity of surface glycosaminoglycans, widened the gap between urothelial cells, increased levels of lipid peroxidation, and decreased antioxidase activities in the urinary bladder (p<0.05). Furthermore, DEPs at a dose of 5.61 μg/μl decreased glutathione, catalase, and glutathione peroxidase activities (p<0.05). These results led to the conclusion that DEPs were a toxic agent in the bladder. The toxic effects might be attributed to oxidative damage mediated by pro-oxidant/antioxidant imbalance or excessive free radicals.
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Affiliation(s)
- Longhua Luo
- Fuzong Clinical College of Fujian Medical University, Fuzhou, China.
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29
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Pavagadhi S, Betha R, Venkatesan S, Balasubramanian R, Hande MP. Physicochemical and toxicological characteristics of urban aerosols during a recent Indonesian biomass burning episode. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:2569-2578. [PMID: 22972615 DOI: 10.1007/s11356-012-1157-9] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2012] [Accepted: 08/27/2012] [Indexed: 05/27/2023]
Abstract
Air particulate matter (PM) samples were collected in Singapore from 21 to 29 October 2010. During this time period, a severe regional smoke haze episode lasted for a few days (21-23 October). Physicochemical and toxicological characteristics of both haze and non-haze aerosols were evaluated. The average mass concentration of PM2.5 (PM with aerodynamic diameter of ≤2.5 μm) increased by a factor of 4 during the smoke haze period (107.2 μg/m(3)) as compared to that during the non-smoke haze period (27.0 μg/m(3)). The PM2.5 samples were analyzed for 16 priority polycyclic aromatic hydrocarbons (PAHs) listed by the United States Environmental Protection Agency and 10 transition metals. Out of the seven PAHs known as potential or suspected carcinogens, five were found in significantly higher levels in smoke haze aerosols as compared to those in the background air. Metal concentrations were also found to be higher in haze aerosols. Additionally, the toxicological profile of the PM2.5 samples was evaluated using a human epithelial lung cell line (A549). Cell viability and death counts were measured after a direct exposure of PM2.5 samples to A459 cells for a period of 48 h. The percentage of metabolically active cells decreased significantly following a direct exposure to PM samples collected during the haze period. To provide further insights into the toxicological characteristics of the aerosol particles, glutathione levels, as an indirect measure of oxidative stress and caspase-3/7 levels as a measure of apoptotic death, were also evaluated.
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Affiliation(s)
- Shruti Pavagadhi
- Singapore Delft Water Alliance, National University of Singapore, Singapore 117576, Singapore
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30
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Sgro LA, D'Anna A, Minutolo P. On the characterization of nanoparticles emitted from combustion sources related to understanding their effects on health and climate. JOURNAL OF HAZARDOUS MATERIALS 2012; 211-212:420-426. [PMID: 22169239 DOI: 10.1016/j.jhazmat.2011.10.097] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Revised: 10/06/2011] [Accepted: 10/08/2011] [Indexed: 05/31/2023]
Abstract
This work describes the use of well-controlled laboratory flames to produce aerosols of organic carbon (OC) as model particles representative of the OC fraction of combustion-generated particulate matter emissions in fresh exhausts. Water-particle interactions are explored in two specific cases. In the first case, particles are exposed to saturated environments and come into direct contact with liquid water by bubbling flame samples through a column of water. This case is representative of particle-liquid interactions relevant to wet removal routes by particle interception by rain or fog droplets or in biological systems covered with biological fluids composed mostly of water. In the second case, the particles are exposed to sub-saturated vapors with H(2)O concentrations representative of cloud-forming atmospheres. The particles' capacity to serve as atmospheric cloud condensation nuclei (CCN) by rapid growth to droplets was measured and compared to NaCl particles, which are highly soluble particles with well known activation diameters. The results show measureable interactions with water in highly saturated conditions. However, in sub-saturated environments, no growth by water condensation was observed, and fresh emissions of OC nanoparticles are not likely to act as CCN in atmospherically relevant humidity.
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Affiliation(s)
- Lee Anne Sgro
- Istituto di Ricerche sulla Combustione, CNR P.le Tecchio 80, 80125 Napoli, Italy.
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31
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Miyata R, van Eeden SF. The innate and adaptive immune response induced by alveolar macrophages exposed to ambient particulate matter. Toxicol Appl Pharmacol 2011; 257:209-26. [PMID: 21951342 DOI: 10.1016/j.taap.2011.09.007] [Citation(s) in RCA: 183] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 08/09/2011] [Accepted: 09/08/2011] [Indexed: 12/16/2022]
Abstract
Emerging epidemiological evidence suggests that exposure to particulate matter (PM) air pollution increases the risk of cardiovascular events but the exact mechanism by which PM has adverse effects is still unclear. Alveolar macrophages (AM) play a major role in clearing and processing inhaled PM. This comprehensive review of research findings on immunological interactions between AM and PM provides potential pathophysiological pathways that interconnect PM exposure with adverse cardiovascular effects. Coarse particles (10 μm or less, PM(10)) induce innate immune responses via endotoxin-toll-like receptor (TLR) 4 pathway while fine (2.5 μm or less, PM(2.5)) and ultrafine particles (0.1 μm or less, UFP) induce via reactive oxygen species generation by transition metals and/or polyaromatic hydrocarbons. The innate immune responses are characterized by activation of transcription factors [nuclear factor (NF)-κB and activator protein-1] and the downstream proinflammatory cytokine [interleukin (IL)-1β, IL-6, and tumor necrosis factor-α] production. In addition to the conventional opsonin-dependent phagocytosis by AM, PM can also be endocytosed by an opsonin-independent pathway via scavenger receptors. Activation of scavenger receptors negatively regulates the TLR4-NF-κB pathway. Internalized particles are subsequently subjected to adaptive immunity involving major histocompatibility complex class II (MHC II) expression, recruitment of costimulatory molecules, and the modulation of the T helper (Th) responses. AM show atypical antigen presenting cell maturation in which phagocytic activity decreases while both MHC II and costimulatory molecules remain unaltered. PM drives AM towards a Th1 profile but secondary responses in a Th1- or Th-2 up-regulated milieu drive the response in favor of a Th2 profile.
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Affiliation(s)
- Ryohei Miyata
- The James Hogg iCAPTURE Centre, University of British Columbia, St. Paul's Hospital, 1081 Burrard Street, Vancouver, BC, Canada
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32
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Pedata P, Boccellino M, La Porta R, Napolitano M, Minutolo P, Sgro LA, Zei F, Sannolo N, Quagliuolo L. Interaction between combustion-generated organic nanoparticles and biological systems:In vitrostudy of cell toxicity and apoptosis in human keratinocytes. Nanotoxicology 2011; 6:338-52. [DOI: 10.3109/17435390.2011.579630] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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33
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Gowdy KM, Krantz QT, King C, Boykin E, Jaspers I, Linak WP, Gilmour MI. Role of oxidative stress on diesel-enhanced influenza infection in mice. Part Fibre Toxicol 2010; 7:34. [PMID: 21092162 PMCID: PMC3001415 DOI: 10.1186/1743-8977-7-34] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2010] [Accepted: 11/22/2010] [Indexed: 01/05/2023] Open
Abstract
Numerous studies have shown that air pollutants, including diesel exhaust (DE), reduce host defenses, resulting in decreased resistance to respiratory infections. This study sought to determine if DE exposure could affect the severity of an ongoing influenza infection in mice, and examine if this could be modulated with antioxidants. BALB/c mice were treated by oropharyngeal aspiration with 50 plaque forming units of influenza A/HongKong/8/68 and immediately exposed to air or 0.5 mg/m3 DE (4 hrs/day, 14 days). Mice were necropsied on days 1, 4, 8 and 14 post-infection and lungs were assessed for virus titers, lung inflammation, immune cytokine expression and pulmonary responsiveness (PR) to inhaled methacholine. Exposure to DE during the course of infection caused an increase in viral titers at days 4 and 8 post-infection, which was associated with increased neutrophils and protein in the BAL, and an early increase in PR. Increased virus load was not caused by decreased interferon levels, since IFN-β levels were enhanced in these mice. Expression and production of IL-4 was significantly increased on day 1 and 4 p.i. while expression of the Th1 cytokines, IFN-γ and IL-12p40 was decreased. Treatment with the antioxidant N-acetylcysteine did not affect diesel-enhanced virus titers but blocked the DE-induced changes in cytokine profiles and lung inflammation. We conclude that exposure to DE during an influenza infection polarizes the local immune responses to an IL-4 dominated profile in association with increased viral disease, and some aspects of this effect can be reversed with antioxidants.
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Affiliation(s)
- Kymberly M Gowdy
- Environmental Public Health Division, National Health and Environmental Effects Research Laboratory, United States Environmental Protection Agency, 109 T,W, Alexander Dr,, RTP, NC, 27711, USA
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34
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Comparison of immunotoxic effects induced by the extracts from methanol and gasoline engine exhausts in vitro. Toxicol In Vitro 2010; 24:1119-25. [DOI: 10.1016/j.tiv.2010.03.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2009] [Revised: 02/08/2010] [Accepted: 03/15/2010] [Indexed: 11/22/2022]
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35
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Murugan V, Peck MJ. Signal transduction pathways linking the activation of alveolar macrophages with the recruitment of neutrophils to lungs in chronic obstructive pulmonary disease. Exp Lung Res 2010; 35:439-85. [PMID: 19842832 DOI: 10.1080/01902140902759290] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Chronic obstructive pulmonary disease (COPD) is a major and increasing global health problem. It is predicted by the World Health Organization to become the third most common cause of death and the fifth most common cause of disability in the world by 2020. COPD is a complex inflammatory disease involving several types of inflammatory cells and multiple inflammatory mediators. Although abnormal numbers of inflammatory cells such as macrophages, dendritic cells, neutrophils, and T lymphocytes have been documented in COPD, the relationship between these cell types and the sequence of their appearance and persistence is largely unknown. Alveolar macrophages have been identified as one of the major cell types that plays a key role in orchestrating the inflammatory events associated with the pathophysiology of COPD. One of the major functions of macrophages is the secretion of chemotactic factors and this function is markedly increased on exposure to cigarette smoke (CS). This enhanced release of chemoattractants results in increased lung neutrophil infiltration, which is thought to be a key event in the development of COPD. The molecular basis for this amplified inflammatory response is not very clear, but it could be due to an alteration in signal transduction pathways within the macrophage. Based on existing literature, an attempt has been made to create a comprehensive review of the signal transduction pathways that link the activation of macrophages with the increased recruitment of neutrophils into the airways. Some of the major stimuli that activate macrophages and cause them to secrete chemotactic factors have been identified as CS, wood smoke, ozone, bacterial endotoxin, and proinflammatory cytokines such as interleukin (IL)-1beta and tumor necrosis factor (TNF)-alpha. These stimuli seem to activate mainly redox-sensitive transcription factors such as nuclear factor (NF)-kappa B and activator protein (AP)-1, both of which play a major role in the synthesis and secretion of chemotactic factors such as IL-8 and leukotriene B(4) (LTB(4)). The pathways involved in the synthesis and secretion of other factors such as macrophage chemotactic protein-1 (MCP-1) and growth-related oncogene-alpha (Gro-alpha) have also been reviewed.
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36
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Nemmar A, Al-Salam S, Zia S, Yasin J, Al Husseni I, Ali BH. Diesel exhaust particles in the lung aggravate experimental acute renal failure. Toxicol Sci 2009; 113:267-77. [PMID: 19797351 DOI: 10.1093/toxsci/kfp222] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Inhaled particles are associated with pulmonary and extrapulmonary effects. Also, acute renal failure (ARF) is associated with increased mortality, related to pulmonary complications. Here, we tested the possible potentiating effect of diesel exhaust particles (DEP) in an animal model of ARF induced by a single ip injection of cisplatin (CP, 6 mg/kg) in rats. Six days later, the rats were intratracheally instilled with either DEP (0.5 or 1 mg/kg) or saline (control) and renal, systemic, and pulmonary variables were studied 24 h thereafter. CP increased the serum concentrations of urea and creatinine and reduced glutathione (GSH) concentration and superoxide dismutase activity in renal cortex. CP caused renal tubular necrosis; increased urine volume, protein concentrations, and N-acetyl-beta-D-glucosaminidase (NAG) activity; and decreased urine osmolality. The combination of DEP and CP aggravated the CP-induced effects on serum urea and creatinine, urine NAG activity, and renal GSH. The arterial O(2) saturation and PO(2) were significantly decreased in CP + DEP versus CP + saline and CP + DEP versus DEP. The number of platelets was reduced in DEP compared to saline-treated rats and CP + DEP versus DEP alone or CP + saline. Increases in macrophage and neutrophils numbers in bronchoalveolar lavage were found in DEP versus saline group and CP + DEP versus CP. Histopathological changes in lungs of DEP-treated rats were aggravated by the combination of CP + DEP. These included marked interstitial cell infiltration and congestion. We conclude that the presence of DEP in the lung aggravated the renal, pulmonary, and systemic effects of CP-induced ARF.
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Affiliation(s)
- Abderrahim Nemmar
- Department of Physiology, United Arab Emirates University, Al Ain, United Arab Emirates.
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Hiramatsu K, Saito Y, Sakakibara K, Azuma A, Takizawa H, Sugawara I. THE EFFECTS OF INHALATION OF DIESEL EXHAUST ON MURINE MYCOBACTERIAL INFECTION. Exp Lung Res 2009; 31:405-15. [PMID: 16025921 DOI: 10.1080/01902140590918786] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
The authors investigated the effects of inhalation of diesel exhaust (DE) on murine mycobacterial infection in vivo. Eight-week-old female BALB/c mice were exposed to DE (3 mg/m3 of diesel exhaust particles [DEPs]) for 1 month, 2 months, or 6 months (for 7 hours a day, 5 days a week). Control mice were housed in a clean room for the same periods. On the day following the last DE exposure, control mice and DE-exposed mice were aerially infected with Mycobacterium tuberculosis (1 x 10(6) colony-forming units (CFU), Kurono strain). At 7 weeks after mycobacterial infection, the authors examined the lung tissues for histopathological changes and performed reverse transcriptase-polymerase chain reaction (RT-PCR) to measure the messenger RNA (mRNA) expression of several proinflammatory cytokines and inducible nitric oxide synthase (iNOS). Then, the homogenates of lungs and spleens were cultured on 1% (v/v) Ogawa's egg slant medium, and after a 4-week incubation period at 37 degrees C, colonies on the medium were counted. After 1 month of DE exposure, the mycobacterial infection had slightly ameliorated. After 2 months of DE exposure, the expression levels of tumor necrosis factor (TNF)-alpha, interleukin (IL)-1beta, IL-12p40, interferon (IFN)-gamma, and iNOS mRNAs were slightly increased. However, after 6 months of DE exposure, the expression levels of IL-1beta , IL-12p40, IFN-gamma, and iNOS mRNAs were decreased, and the infection as measured by increased lung burden (CFU) actually increased. These results indicate that long-term DE exposure may increase pulmonary mycobacterial burden.
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Affiliation(s)
- Kumiko Hiramatsu
- Fourth Department of Internal Medicine, Nippon Medical School, Tokyo, Japan
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Karr CJ, Rudra CB, Miller KA, Gould TR, Larson T, Sathyanarayana S, Koenig JQ. Infant exposure to fine particulate matter and traffic and risk of hospitalization for RSV bronchiolitis in a region with lower ambient air pollution. ENVIRONMENTAL RESEARCH 2009; 109:321-7. [PMID: 19211100 PMCID: PMC2925442 DOI: 10.1016/j.envres.2008.11.006] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2008] [Revised: 10/29/2008] [Accepted: 11/17/2008] [Indexed: 04/14/2023]
Abstract
Few studies investigate the impact of air pollution on the leading cause of infant morbidity, acute bronchiolitis. We investigated the influence of PM(2.5) and other metrics of traffic-derived air pollution exposure using a matched case-control dataset derived from 1997 to 2003 birth and infant hospitalization records from the Puget Sound Region, Washington State. Mean daily PM(2.5) exposure for 7, 30, 60 and lifetime days before case bronchiolitis hospitalization date were derived from community monitors. A regional land use regression model of NO(2) was applied to characterize subject's exposure in the month prior to case hospitalization and lifetime average before hospitalization. Subject's residential proximity within 150 m of highways, major roadways, and truck routes was also assigned. We evaluated 2604 (83%) cases and 23,354 (85%) controls with information allowing adjustment for mother's education, mother's smoking during pregnancy, and infant race/ethnicity. Effect estimates derived from conditional logistic regression revealed very modest increased risk and were not statistically significant for any of the exposure metrics in fully adjusted models. Overall, risk estimates were stronger when restricted to bronchiolitis cases attributed to respiratory syncytial virus (RSV) versus unspecified and for longer exposure windows. The adjusted odds ratio (OR(adj)) and 95% confidence interval per 10 mcg/m(3) increase in lifetime PM(2.5) was 1.14, 0.88-1.46 for RSV bronchiolitis hospitalization. This risk was also elevated for infants who resided within 150 m of a highway (OR(adj) 1.17, 0.95-1.44). This study supports a developing hypothesis that there may be a modest increased risk of bronchiolitis attributable to chronic traffic-derived particulate matter exposure particularly for infants born just before or during peak RSV season. Future studies are needed that can investigate threshold effects and capture larger variability in spatial contrasts among populations of infants.
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Affiliation(s)
- Catherine J Karr
- Department of Pediatrics, University of Washington, Seattle, WA 98104, USA.
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Non-cancer health effects of diesel exhaust: A critical assessment of recent human and animal toxicological literature. Crit Rev Toxicol 2009; 39:195-227. [DOI: 10.1080/10408440802220603] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Nam HY, Ahn EK, Kim HJ, Lim Y, Lee CB, Lee KY, Vallyathan V. Diesel exhaust particles increase IL-1beta-induced human beta-defensin expression via NF-kappaB-mediated pathway in human lung epithelial cells. Part Fibre Toxicol 2006; 3:9. [PMID: 16723032 PMCID: PMC1524805 DOI: 10.1186/1743-8977-3-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2005] [Accepted: 05/25/2006] [Indexed: 02/07/2023] Open
Abstract
Background Human β-defensin (hBD)-2, antimicrobial peptide primarily induced in epithelial cells, is a key factor in the innate immune response of the respiratory tract. Several studies showed increased defensin levels in both inflammatory lung diseases, such as cystic fibrosis, diffuse panbronchiolitis, idiopathic pulmonary fibrosis and acute respiratory distress syndrome, and infectious diseases. Recently, epidemiologic studies have demonstrated acute and serious adverse effects of particulate air pollution on respiratory health, especially in people with pre-existing inflammatory lung disease. To elucidate the effect of diesel exhaust particles (DEP) on pulmonary innate immune response, we investigated the hBD-2 and interleukin-8 (IL-8) expression to DEP exposure in interleukin-1 beta (IL-1β)-stimulated A549 cells. Results IL-1β markedly up-regulated the hBD-2 promoter activity, and the subsequent DEP exposure increased dose-dependently the expression of hBD-2 and inflammatory cytokine IL-8 at the transcriptional level. In addition, DEP further induced the NF-κB activation in IL-1β-stimulated A549 cells more rapidly than in unstimulated control cells, which was showed by nuclear translocation of p65 NF-κB and degradation of IκB-α. The experiment using two NF-κB inhibitors, PDTC and MG132, confirmed that this increase of hBD-2 expression following DEP exposure was regulated through NF-κB-mediated pathway. Conclusion These results demonstrated that DEP exposure increases the expression of antimicrobial peptide and inflammatory cytokine at the transcriptional level in IL-1β-primed A549 epithelial cells and suggested that the increase is mediated at least partially through NF-κB activation. Therefore, DEP exposure may contribute to enhance the airway-responsiveness especially on the patients suffering from chronic respiratory disease.
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Affiliation(s)
- Hae Yun Nam
- Catholic Neuroscience Center, The Catholic University of Korea, Seoul 137–701, Korea
- Department of Occupational & Environmental Medicine, St. Mary's Hospital, The Catholic University of Korea, Seoul 150–713, Korea
| | - Eun-Kyung Ahn
- Department of Occupational & Environmental Medicine, St. Mary's Hospital, The Catholic University of Korea, Seoul 150–713, Korea
| | - Hyung Jung Kim
- Department of Internal Medicine, Yonsei University College of Medicine, Seoul 135–270, Korea
| | - Young Lim
- Department of Occupational & Environmental Medicine, St. Mary's Hospital, The Catholic University of Korea, Seoul 150–713, Korea
| | - Chun Beoun Lee
- Environmental Parts R & D Center, Korea Automotive Technology Instititute, Cheonan, 330–912, Korea
| | - Kyo Young Lee
- Department of Hospital Pathology, Kangnam St. Mary's Hospital, The Catholic University of Korea, Seoul 137–701, Korea
| | - Val Vallyathan
- Exposure Assessment Branch and Pathology and Physiology Research Branch, Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, WV, USA
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Mundandhara SD, Becker S, Madden MC. Effects of diesel exhaust particles on human alveolar macrophage ability to secrete inflammatory mediators in response to lipopolysaccharide. Toxicol In Vitro 2005; 20:614-24. [PMID: 16360300 DOI: 10.1016/j.tiv.2005.10.018] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2005] [Revised: 10/11/2005] [Accepted: 10/28/2005] [Indexed: 11/29/2022]
Abstract
Ambient particulate matter (PM) has been shown to be associated with mortality and morbidity. Diesel exhaust particles (DEP) contribute to ambient PM. Alveolar macrophages (AM) are important targets for PM effects in the lung. The effects of DEP exposure on human AM response to lipopolysachharide (LPS; from gram-negative bacteria) challenge in vitro were determined by monitoring the production of interleukin 8 (IL-8), tumor necrosis factor-alpha (TNF-alpha) and prostaglandin E(2) (PGE(2)). The roles of organic compounds and carbonaceous core of DEP in response to LPS were evaluated by comparing the DEPs effect to that of carbon black (CB), a carbonaceous particle with few adsorbed organic compounds. AMs were exposed in vitro to Standard Reference Material (SRM) DEP 2975, SRM DEP 1650, SRM 1975 (a dichloromethane extract of SRM DEP 2975) and CB particles for 24 h. DEPs induced a decreased secretion of IL-8, TNF-alpha and PGE(2) in response to a subsequent LPS stimulation. DEPs also show suppressive effect on the release of inflammatory mediators when stimulated with lipoteichoic acid, a product of gram positive bacteria. In summary, in vitro exposure of human AM to DEPs significantly suppress AM responsiveness to gram-negative and positive bacterial products, which may be a contributing factor to the impairment of pulmonary defense.
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Affiliation(s)
- Sailaja D Mundandhara
- Center for Environmental Medicine, Asthma, and Lung Biology, University of North Carolina, Chapel Hill, NC, USA
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Yin XJ, Dong CC, Ma JYC, Antonini JM, Roberts JR, Barger MW, Ma JKH. Sustained effect of inhaled diesel exhaust particles on T-lymphocyte-mediated immune responses against Listeria monocytogenes. Toxicol Sci 2005; 88:73-81. [PMID: 16107554 DOI: 10.1093/toxsci/kfi279] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Studies have shown that exposure to diesel exhaust particles (DEP) suppresses pulmonary host defense against bacterial infection. The present study was carried out to characterize whether DEP exposure exerts a sustained effect in which inhaled DEP increase the susceptibility of the lung to bacterial infection occurring at a later time. Brown Norway rats were exposed to filtered air or DEP by inhalation at a dose of 21.2 +/- 2.3 mg/m3, 4 h/day for 5 days, and intratracheally instilled with saline or 100,000 Listeria monocytogenes (Listeria) 7 days after the final DEP exposure. Bacterial growth and cellular responses to DEP and Listeria exposures were examined at 3 and 7 days post-infection. The results showed that inhaled DEP prolonged the growth of bacteria, administered 7 days post DEP exposure, in the lung as compared to the air-exposed controls. Pulmonary responses to Listeria infection were characterized by increased production of interleukin (IL)-1beta, tumor necrosis factor (TNF)-alpha, IL-12, and IL-10 by alveolar macrophages (AM) and increased presence of T lymphocytes and their CD4+ and CD8+ subsets in lung draining lymph nodes that secreted elevated levels of IL-2, IL-6, IL-10, and interferon (IFN)-gamma. Diesel exhaust particles were found to inhibit Listeria-induced production of IL-1beta and TNF-alpha, which are responsible for the innate immunity, and IL-12, which initiates the development of T helper (Th)1 responses, but enhance Listeria-induced AM production of IL-10, which prolongs Listeria survival in these phagocytes. The dual action of DEP on AM production of IL-12 and IL-10 correlated with an inhibition of the development of bacteria-specific T lymphocytes by DEP. Cytokine production by lymphocytes from DEP- and Listeria-exposed rats showed a marked decrease in the production of IL-2, IL-10, and IFN-gamma compared to Listeria infection alone, suggesting either that DEP inhibit the production of cytokines by lymphocytes or that these lymphocytes contained T-cell subsets that are different from those of Listeria infection alone and less effective in mediating Th1 immune responses. This study demonstrates that inhaled DEP, after a 7-day resting period, increase the susceptibility of the lung to bacterial infection occurring at a later time by inhibiting macrophage immune function and suppressing the development of T-cell-mediated immune responses. The results support the epidemiological observations that exposure to DEP may be responsible for the pulmonary health effects on humans.
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Affiliation(s)
- Xuejun J Yin
- School of Pharmacy, West Virginia University, Morgantown, West Virginia 26506-9530, USA
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Jaspers I, Ciencewicki JM, Zhang W, Brighton LE, Carson JL, Beck MA, Madden MC. Diesel exhaust enhances influenza virus infections in respiratory epithelial cells. Toxicol Sci 2005; 85:990-1002. [PMID: 15772371 DOI: 10.1093/toxsci/kfi141] [Citation(s) in RCA: 115] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Several factors, such as age and nutritional status, can affect the susceptibility to influenza infections. Moreover, exposure to air pollutants, such as diesel exhaust (DE), has been shown to affect respiratory virus infections in rodent models. Influenza virus primarily infects and replicates in respiratory epithelial cells, which are also a major targets for inhaled DE. Using in vitro models of human respiratory epithelial cells, we determined the effects of an aqueous-trapped solution of DE (DE(as)) on influenza infections. Differentiated human nasal and bronchial epithelial cells, as well as A549 cells, were exposed to DE(as) and infected with influenza A/Bangkok/1/79. DE(as) enhanced the susceptibility to influenza virus infection in all cell models and increased the number of influenza-infected cells within 24 h post-infection. This was not caused by suppressing antiviral mediator production, since interferon (IFN) beta levels, IFN-dependent signaling, and IFN-stimulated gene expression were also enhanced by exposure to DE(as). Many of the adverse effects induced by DE exposure are mediated by oxidative stress. Exposure to DE(as) used in these studies generated oxidative stress in respiratory epithelial cells, and addition of the antioxidant glutathione-ethylester (GSH-ET) reversed the effects of DE(as) on influenza infections. Furthermore, DE(as) increased influenza virus attachment to respiratory epithelial cells within 2 h post-infection. Taken together, the results presented here suggest that in human respiratory epithelial cells oxidative stress generated by DE(as) increases the susceptibility to influenza infection and that exposure to DE(as) increases the ability of the virus to attach to and enter respiratory epithelial cells.
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Affiliation(s)
- Ilona Jaspers
- Center for Environmental Medicine, Asthma, and Lung Biology, Department of Pediatrics, Division of Infectious Diseases and Host Defense, University of North Carolina at Chapel Hill, North Carolina 27599-7310, USA.
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Gilmour PS, Schladweiler MC, Richards JH, Ledbetter AD, Kodavanti UP. Hypertensive rats are susceptible to TLR4-mediated signaling following exposure to combustion source particulate matter. Inhal Toxicol 2004; 16 Suppl 1:5-18. [PMID: 15204789 DOI: 10.1080/08958370490442827] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Toll-like receptor 4 (TLR4) has been shown to play a role in cell signaling that results in neutrophilic inflammation in response to lipopolysaccharide and respiratory syncytial virus infection. TLR4 also interacts with CD14, which upon complex formation triggers TLR4-associated signaling pathways to produce a proinflammatory response. This mechanism results in the activation of NF-kappa B and subsequent inflammatory gene induction. In order to determine the effect of combustion source particle matter (PM), rich in zinc and nickel but with negligible endotoxin, on a possible activation of TLR4-mediated cell signaling and inflammation, we intratracheally (IT) instilled 3.3 mg/kg of PM into 12-w-old healthy male Wistar Kyoto (WKY) and susceptible spontaneously hypertensive (SH) rats. Inflammation, inflammatory-mediator gene expression, bronchoalveolar lavage fluid (BALF) protein and LDH, TLR4 and CD14 protein, and NF-kappa B activation in the lung were determined after 24 h. Dose-response data (0.0, 0.83, 3.33, and 8.3 mg/kg PM) for BALF LDH were obtained as a marker of lung cell injury in SH rats. BALF neutrophils, but not macrophages, were significantly increased in the PM-exposed WKY and SH rats. SH rats showed a greater PMN increase than WKY rats. Similarly, BALF protein and LDH levels were also increased following PM exposure but to a significantly greater extent in SH rats. Plasma fibrinogen was increased only in SH rats exposed to PM. The increased inflammation seen in PM-exposed SH rats was accompanied by a significant increase in TLR4 protein in the lung tissue, which was primarily localized in alveolar macrophages and epithelial cells. CD14 was also increased by PM exposure in both SH and WKY rats but was significantly greater in the SH rats. These increases were associated with greater translocation of NF-kappa B in the lungs of SH rather than WKY rats. This was accompanied by increased macrophage inhibitory protein (MIP)-2 mRNA expression at 24 h of exposure. These data suggest that the increased inflammation in the lungs of PM-exposed SH rats compared to WKY rats is accompanied by an increase in TLR4-mediated cell signaling. Thus, one of the mechanisms for greater susceptibility of SH rats to PM exposure may involve an increased activation of the TLR4 signaling pathway.
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Affiliation(s)
- Peter S Gilmour
- Center for Environmental Medicine, Asthma and Lung Biology, School of Medicine, University of North Carolina at Chapel Hill, USA.
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Ma JYC, Rengasamy A, Frazer D, Barger MW, Hubbs AF, Battelli L, Tomblyn S, Stone S, Castranova V. Inhalation exposure of rats to asphalt fumes generated at paving temperatures alters pulmonary xenobiotic metabolism pathways without lung injury. ENVIRONMENTAL HEALTH PERSPECTIVES 2003; 111:1215-1221. [PMID: 12842776 PMCID: PMC1241577 DOI: 10.1289/ehp.5740] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Asphalt fumes are complex mixtures of various organic compounds, including polycyclic aromatic hydrocarbons (PAHs). PAHs require bioactivation by the cytochrome P-450 monooxygenase system to exert toxic/carcinogenic effects. The present study was carried out to characterize the acute pulmonary inflammatory responses and the alterations of pulmonary xenobiotic pathways in rats exposed to asphalt fumes by inhalation. Rats were exposed at various doses and time periods to air or to asphalt fumes generated at paving temperatures. To assess the acute damage and inflammatory responses, differential cell counts, acellular lactate dehydrogenase (LDH) activity, and protein content of bronchoalveolar lavage fluid were determined. Alveolar macrophage (AM) function was assessed by monitoring generation of chemiluminescence and production of tumor necrosis factor-alpha and interleukin-1. Alteration of pulmonary xenobiotic pathways was determined by monitoring the protein levels and activities of P-450 isozymes (CYP1A1 and CYP2B1), glutathioneS-transferase (GST), and NADPH:quinone oxidoreductase (QR). The results show that acute asphalt fume exposure did not cause neutrophil infiltration, alter LDH activity or protein content, or affect AM function, suggesting that short-term asphalt fume exposure did not induce acute lung damage or inflammation. However, acute asphalt fume exposure significantly increased the activity and protein level of CYP1A1 whereas it markedly reduced the activity and protein level of CYP2B1 in the lung. The induction of CYP1A1 was localized in nonciliated bronchiolar epithelial (Clara) cells, alveolar septa, and endothelial cells by immunofluorescence microscopy. Cytosolic QR activity was significantly elevated after asphalt fume exposure, whereas GST activity was not affected by the exposure. This induction of CYP1A1 and QR with the concomitant down-regulation of CYP2B1 after asphalt fume exposure could alter PAH metabolism and may lead to potential toxic effects in the lung.
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Affiliation(s)
- Jane Y C Ma
- Health Effects Laboratory Division, National Institute for Occupational Safety and Health, Morgantown, West Virginia 26505-2888, USA.
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Harrod KS, Jaramillo RJ, Rosenberger CL, Wang SZ, Berger JA, McDonald JD, Reed MD. Increased susceptibility to RSV infection by exposure to inhaled diesel engine emissions. Am J Respir Cell Mol Biol 2003; 28:451-63. [PMID: 12654634 DOI: 10.1165/rcmb.2002-0100oc] [Citation(s) in RCA: 118] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Although epidemiologic data strongly suggest a role for inhaled environmental pollutants in modulating the susceptibility to respiratory infection in humans, the underlying cellular and molecular mechanisms have not been well studied in experimental systems. The current study assessed the impact of inhaled diesel engine emissions (DEE) on the host response in vivo to a common pediatric respiratory pathogen, respiratory syncytial virus (RSV). Using a relatively resistant mouse model of RSV infection, prior exposure to either 30 microg/m3 particulate matter (PM) or 1,000 microg/m3 PM of inhaled DEE (6 h/d for seven consecutive days) increased lung inflammation to RSV infection as compared with air-exposed RSV-infected C57Bl/6 mice. Inflammatory cells in bronchoalveolar lavage fluid were increased in a dose-dependent manner with regard to the level of DEE exposure, concomitant with increased levels of inflammatory mediators. Lung histology analysis indicated pronounced peribronchial and peribronchiolar inflammation concordant with the level of DEE exposure during infection. Mucous cell metaplasia was markedly increased in the airway epithelium of DEE-exposed mice following RSV infection. Interestingly, both airway and alveolar host defense and immunomodulatory proteins were attenuated during RSV infection by prior DEE exposure. DEE-induced changes in inflammatory and lung epithelial responses to infection were associated with increased RSV gene expression in the lungs following DEE exposure. These findings are consistent with the concept that DEE exposure modulates the lung host defense to respiratory viral infections and may alter the susceptibility to respiratory infections leading to increased lung disease.
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Affiliation(s)
- Kevin S Harrod
- Asthma and Pulmonary Immunology, Lovelace Respiratory Research Institute, 2425 Ridgecrest Dr. SE, Albuquerque, NM 87108, USA.
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Yeates DB, Mauderly JL. Inhaled environmental/occupational irritants and allergens: mechanisms of cardiovascular and systemic responses. Introduction. ENVIRONMENTAL HEALTH PERSPECTIVES 2001; 109 Suppl 4:479-481. [PMID: 11544150 PMCID: PMC1240568 DOI: 10.1289/ehp.01109s4479] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The articles in this monograph focus on the mechanisms whereby ambient particulate matter (PM) and co-pollutants deposited in the respiratory tract cause cardiovascular and systemic effects, especially in persons with preexisting conditions such as allergic hyperresponsiveness and pulmonary, cardiac, and vascular diseases. During the past few years, it has become clear that inhaled pollutants cause adverse effects outside the respiratory tract and that these effects may in some cases be more important than respiratory effects. Investigators pursuing traditional approaches to understanding mechanisms of air pollution effects need to be brought together with those outside that community who have expertise in pathogenetic mechanisms by which deposited air pollutants might affect nonrespiratory organs. To this end, a workshop was held and papers were developed from a broad range of scientists having specialized expertise in allergic and cardiovascular physiology. The overall goal of this monograph is to benchmark current thinking and enhance progress toward identifying and understanding the mechanisms by which nonrespiratory health effects occur and, by extension, to facilitate the appropriate management of relationships between air quality and health. This monograph contains a compilation of multidisciplinary research that forms a framework for generating and testing plausible new research hypotheses. Not only will this information stimulate the thinking of researchers, but it will also provide an improved foundation for funding agencies and advisory groups to frame research strategies, programs, and priorities.
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Affiliation(s)
- D B Yeates
- Department of Medicine, University of Illinois at Chicago, Chicago, Illinois, USA.
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