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Jirau-Colón H, Jiménez-Vélez BD. PM 2.5 Extracts Induce INFγ-Independent Activation of CIITA, MHCII, and Increases Inflammation in Human Bronchial Epithelium. TOXICS 2024; 12:292. [PMID: 38668515 PMCID: PMC11054084 DOI: 10.3390/toxics12040292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Revised: 02/29/2024] [Accepted: 03/12/2024] [Indexed: 04/29/2024]
Abstract
The capacity of particulate matter (PM) to enhance and stimulate the expression of pro-inflammatory mediators has been previously demonstrated in non-antigen-presenting cells (human bronchial epithelia). Nonetheless, many proposed mechanisms for this are extrapolated from known canonical molecular pathways. This work evaluates a possible mechanism for inflammatory exacerbation after exposure to PM2.5 (from Puerto Rico) and CuSO4, using human bronchial epithelial cells (BEAS-2B) as a model. The induction of CIITA, MHCII genes, and various pro-inflammatory mediators was investigated. Among these, the phosphorylation of STAT1 Y701 was significantly induced after 4 h of PM2.5 exposure, concurrent with a slight increase in CIITA and HLA-DRα mRNA levels. INFγ mRNA levels remained low amidst exposure time, while IL-6 levels significantly increased at earlier times. IL-8 remained low, as expected from attenuation by IL-6 in the known INFγ-independent inflammation pathway. The effects of CuSO4 showed an increase in HLA-DRα expression after 8 h, an increase in STAT1 at 1 h, and RF1 at 8 h We hypothesize and show evidence that an inflammatory response due to PM2.5 extract exposure in human bronchial epithelia can be induced early via an alternate non-canonical pathway in the absence of INFγ.
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Affiliation(s)
- Héctor Jirau-Colón
- Department of Biochemistry, University of Puerto Rico Medical Sciences Campus, San Juan 00935, Puerto Rico;
- Center for Environmental and Toxicological Research, Biochemistry Department, San Juan 00935, Puerto Rico
| | - Braulio D. Jiménez-Vélez
- Department of Biochemistry, University of Puerto Rico Medical Sciences Campus, San Juan 00935, Puerto Rico;
- Center for Environmental and Toxicological Research, Biochemistry Department, San Juan 00935, Puerto Rico
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2
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Chuang SH, Kuo YJ, Huang SW, Zhang HW, Peng HC, Chen YP. Association Between Long‑Term Exposure to Air Pollution and the Rate of Mortality After Hip Fracture Surgery in Patients Older Than 60 Years: Nationwide Cohort Study in Taiwan. JMIR Public Health Surveill 2024; 10:e46591. [PMID: 38342504 PMCID: PMC10985614 DOI: 10.2196/46591] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 10/08/2023] [Accepted: 02/08/2024] [Indexed: 02/13/2024] Open
Abstract
BACKGROUND To enhance postoperative patient survival, particularly in older adults, understanding the predictors of mortality following hip fracture becomes paramount. Air pollution, a prominent global environmental issue, has been linked to heightened morbidity and mortality across a spectrum of diseases. Nevertheless, the precise impact of air pollution on hip fracture outcomes remains elusive. OBJECTIVE This retrospective study aims to comprehensively investigate the profound influence of a decade-long exposure to 12 diverse air pollutants on the risk of post-hip fracture mortality among older Taiwanese patients (older than 60 years). We hypothesized that enduring long-term exposure to air pollution would significantly elevate the 1-year mortality rate following hip fracture surgery. METHODS From Taiwan's National Health Insurance Research Database, we obtained the data of patients who underwent hip fracture surgery between July 1, 2003, and December 31, 2013. Using patients' insurance registration data, we estimated their cumulative exposure levels to sulfur dioxide (SO2), carbon dioxide (CO2), carbon monoxide (CO), ozone (O3), particulate matter having a size of <10 μm (PM10), particulate matter having a size of <2.5 μm (PM2.5), nitrogen oxides (NOX), nitrogen monoxide (NO), nitrogen dioxide (NO2), total hydrocarbons (THC), nonmethane hydrocarbons (NMHC), and methane (CH4). We quantified the dose-response relationship between these air pollutants and the risk of mortality by calculating hazard ratios associated with a 1 SD increase in exposure levels over a decade. RESULTS Long-term exposure to SO2, CO, PM10, PM2.5, NOX, NO, NO2, THC, NMHC, and CH4 demonstrated significant associations with heightened all-cause mortality risk within 1 year post hip fracture surgery among older adults. For older adults, each 1 SD increment in the average exposure levels of SO2, CO, PM10, PM2.5, NOX, NO, NO2, THC, NMHC, and CH4 corresponded to a substantial escalation in mortality risk, with increments of 14%, 49%, 18%, 12%, 41%, 33%, 38%, 20%, 9%, and 26%, respectively. We further noted a 35% reduction in the hazard ratio for O3 exposure suggesting a potential protective effect, along with a trend of potentially protective effects of CO2. CONCLUSIONS This comprehensive nationwide retrospective study, grounded in a population-based approach, demonstrated that long-term exposure to specific air pollutants significantly increased the risk of all-cause mortality within 1 year after hip fracture surgery in older Taiwanese adults. A reduction in the levels of SO2, CO, PM10, PM2.5, NOX, NO, NO2, THC, NMHC, and CH4 may reduce the risk of mortality after hip fracture surgery. This study provides robust evidence and highlights the substantial impact of air pollution on the outcomes of hip fractures.
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Affiliation(s)
- Shu-Han Chuang
- Division of General Practice, Department of Medical Education, Changhua Christian Hospital, Changhua, Taiwan
| | - Yi-Jie Kuo
- Department of Orthopedics, Wan Fang Hospital, Taipei Medical University, Taipei City, Taiwan
- Department of Orthopedics, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Shu-Wei Huang
- Department of Applied Science, National Taitung University, Taitung City, Taitung County, Taiwan
| | - Han-Wei Zhang
- MetaTrial Research Center, Biomedica Corporation, New Taipei, Taiwan
- Program for Aging, China Medical University, Taichung, Taiwan
- Institute of Population Health Sciences, National Health Research Institutes, Miaoli, Taiwan
- Department of Electrical and Computer Engineering, Institute of Electrical Control Engineering, National Yang Ming Chiao Tung University, Hsinchu, Taiwan
| | - Hsiao-Ching Peng
- MetaTrial Research Center, Biomedica Corporation, New Taipei, Taiwan
| | - Yu-Pin Chen
- Department of Orthopedics, Wan Fang Hospital, Taipei Medical University, Taipei City, Taiwan
- Department of Orthopedics, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
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3
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Evaluation of ·OH Production Potential of Particulate Matter (PM2.5) Collected on TiO2-Supporting Quartz Filters. Catalysts 2022. [DOI: 10.3390/catal12091016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Oxidative stress induced by fine particulate matter 2.5 (PM2.5) is a potential cause of adverse health effects owing to the production of reactive oxygen species (ROS). Air filtration is a key technology for preventing exposure to particulate contaminations; however, particulate matter trapped by filters has the potential risk of human contact with condensed PM2.5. Thus, this study aims to reduce the hydroxyl radical (·OH) production potential of PM2.5 collected on such TiO2-supporting quartz filters. The ·OH production potential was evaluated for PM2.5, which was collected in Kanagawa, Japan, using a terephthalate assay coupled with flow injection analysis. Although the PM2.5 levels at the sampling site were not severe, the PM2.5 samples exhibited ·OH production potential, which was mostly attributed to organic aerosols. The effect was verified using a TiO2-supporting quartz filter for the collection and subsequent degradation of PM2.5. The ·OH production potential was significantly reduced from 0.58 ± 0.40 pmol/(min m3) to 0.22 ± 0.13 pmol/(min m3) through ultraviolet irradiation for 24 h. This suggests that the photocatalytic reaction of the TiO2 filter is effective in reducing the ·OH production potential of PM2.5.
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Investigation on Pollution Control Device (PCD) in iron foundry industry to reduce environmental chemicals. PLoS One 2022; 17:e0271032. [PMID: 35877599 PMCID: PMC9312380 DOI: 10.1371/journal.pone.0271032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2022] [Accepted: 06/22/2022] [Indexed: 12/02/2022] Open
Abstract
Right from the olden days, many products have been made according to foundry practices in order to generate prosperity in the societies in which they operate while reaping these types of benefits through the operation of foundries. It is alarming that the emissions released by foundries affect human health. Therefore, foundries installed Pollution Control devices (PCDs), in accordance with this development; researchers examined the effectiveness of these PCDs in controlling emissions from foundries in different parts of the world. The emission control obtained by installing these PCDs is explained in this article based on the data gathered from the survey. The cartridge filter equipped with an induction furnace reduced the concentration of SPM to less than 20 mg/Nm3. This result of the investigation indicates that the cartridge filter built into the induction furnace achieves the best efficiency in controlling contaminants from iron foundries. Interestingly, the operation of the cartridge filter has yet to be documented. Therefore, the construction operation, the performance of the cartridge filter, and its efficiency in achieving contaminations control in foundries are described. This will provide useful information on the use of cartridge filters in an induction furnace to reduce Iron foundry emissions.
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Ramaswamy K, Jule LT, N N, Subramanian K, R S, L PD, Seenivasan V. Reduction of environmental chemicals, toxicity and particulate matter in wet scrubber device to achieve zero emissions. Sci Rep 2022; 12:9170. [PMID: 35654879 PMCID: PMC9163193 DOI: 10.1038/s41598-022-13369-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Accepted: 05/16/2022] [Indexed: 11/09/2022] Open
Abstract
The fine particles generated by the foundry industry are present in the atmosphere; they have an impact on the climate because of their influence on atmospheric radioactive phenomena. As a result of this scenario, there is a rising amount of legislation restricting the emission of pollutants from foundry industries and related businesses. In response to this situation, many researchers have concentrated on end-of-pipe technologies, one of which is the wet scrubber, which is a device that is primarily used in foundries to control pollution and is one of the devices that has been incorporated. The disadvantage of using this wet scrubber, on the other hand, is that it contributes to secondary pollution when it is used. In order to combat secondary pollution, a model of an enhanced wet scrubber system that incorporates a multi-sand filtering technology was developed. The performance of this redesigned wet scrubber system was evaluated with the use of computational fluid dynamics (CFD) software. In CFD, the Reynolds stress model was applied for simulation. The pressure magnitudes and velocity magnitudes are obtained by this simulation. The volume fraction of the dust was evaluated through the DPM approach. Because of the introduction of the filtration tank's computation, it was discovered that successful filtration was accomplished using sand filters, meaning that environmental chemicals and particles were totally filtered from 0.17 kg at the entrance to zero kg of particles at the outflow.
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Affiliation(s)
- Krishnaraj Ramaswamy
- Mechanical Engineering Department, College of Engineering and Technology, Dambi Dollo University, Dambi Dollo, Ethiopia. .,Centre for Excellence in Indigenous Knowledge, Innovative Technology Transfer and Entrepreneurship, Dambi Dollo University, Dambi Dollo, Ethiopia.
| | - Leta Tesfaye Jule
- Department of Physics, College of Natural and Computational Science, Dambi Dollo University, Dambi Dollo, Ethiopia.,Centre for Excellence in Indigenous Knowledge, Innovative Technology Transfer and Entrepreneurship, Dambi Dollo University, Dambi Dollo, Ethiopia
| | - Nagaprasad N
- Department of Mechanical Engineering, Ultra College of Engineering and Technology, Madurai, Tamil Nadu, 625 107, India
| | - Kumaran Subramanian
- Centre for Drug Discovery and Development, Sathyabama Institue of Science and Technology, Chennai, Tamil Nadu, 600119, India
| | - Shanmugam R
- TIFAC, CORE-HD, Department of Pharmacognosy, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty, Nilgiris, Tamil Nadu, India
| | - Priyanka Dwarampudi L
- Department of Pharmacognosy, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty, Nilgiris, Tamil Nadu, India
| | - Venkatesh Seenivasan
- Department of Mechanical Engineering, Sri Eshwar College of Engineering, Coimbatore, India
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Qi H, Zhao B, Li L, Qu B. Effect-directed analysis of toxic organics in PM 2.5 exposure to the cellular bioassays in vitro: Application in Shanxi of China. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 237:113501. [PMID: 35453017 DOI: 10.1016/j.ecoenv.2022.113501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Revised: 04/03/2022] [Accepted: 04/07/2022] [Indexed: 06/14/2023]
Abstract
To optimize the effect-directed analysis (EDA) approach to identify the fine particulate matter (PM2.5) bound organic toxicants, Jinzhong city, in the Shanxi Province of China, was selected as the object of our study. First, PM2.5 samples were collected and their organic extracts were separated out in 9 fractions (F1-F9) using reversed-phase high performance liquid chromatography after purification using gel permeation chromatography. Second, the toxicity effects of each fraction were measured by human bronchial epithelial cells (BEAS-2B) in vitro. And toxicity effects included antioxidant stress (ROS, LDH, and CAT) and an inflammatory response (IL-6, IL-1β, and TNF-α). The results showed that the scores of the toxicity effects on multiple lines of evidence were the highest in the F3 and F4 fractions compared with those of the control. Subsequently, the main poisons, o-cymene, p-cymene, benzene, ethylbenzene, xylene, and styrene, were identified using GC×GC-TOF/MS. Finally, to confirm the above possible candidates, (1) the levels of o-cymene, p-cymene and BTEXS in daily PM2.5 were measured using GC-MS in November 2020, and the rates of detection of these pollutants were 100% in PM2.5. Among them, o-cymene and p-cymene were first reported as the key toxic substances of PM2.5, and their average concentration values were 0.16 ± 0.11 and 0.18 ± 0.15 ng‧m-3, respectively. (2) the toxicity of p-cymene may be no less than that of other benzene derivatives according to their LC50 in Daphnia magna. (3) based on canonical correlation analysis, the exposure to p-cymene, benzene, and styrene in PM2.5 was most likely associated with the toxicity effects (CAT, IL-6, and TNF-α), which in turn caused the observed toxicity. In conclusion, p-cymene, benzene, and styrene were found to be the key toxic organics in PM2.5 for cells in vitro. EDA technology avoids the limitations of chemical analysis and uncertainty of the biological testing and adds new toxicants to the control list of PM2.5, contributing to this study field. However, the application of EDA to PM2.5 still faces challenges such as the selection of biological effects, loss of toxicity with the separation process, influence of the dosing method, and identification of the unknown effects of pollutants.
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Affiliation(s)
- Hongxue Qi
- Department of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, Shanxi, China
| | - Bingqing Zhao
- Department of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, Shanxi, China
| | - Lihong Li
- Department of Chemistry and Chemical Engineering, Jinzhong University, Jinzhong 030619, Shanxi, China.
| | - Bo Qu
- Department of Environmental Science and Biotechnology, Medical Science, Jeonju University, Jeonju 555069, Republic of Korea
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Tian M, Zhao J, Mi X, Wang K, Kong D, Mao H, Wang T. Progress in research on effect of PM
2.5
on occurrence and development of atherosclerosis. J Appl Toxicol 2020; 41:668-682. [DOI: 10.1002/jat.4110] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2020] [Revised: 10/22/2020] [Accepted: 10/24/2020] [Indexed: 12/12/2022]
Affiliation(s)
- Mengya Tian
- Tianjin Key Laboratory of Urban Transport Emission Research, State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering Nankai University Tianjin China
| | - Jingbo Zhao
- Tianjin Key Laboratory of Urban Transport Emission Research, State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering Nankai University Tianjin China
| | - Xingyan Mi
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences Nankai University Tianjin China
| | - Kai Wang
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences Nankai University Tianjin China
| | - Deling Kong
- Key Laboratory of Bioactive Materials, Ministry of Education, College of Life Sciences Nankai University Tianjin China
| | - Hongjun Mao
- Tianjin Key Laboratory of Urban Transport Emission Research, State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering Nankai University Tianjin China
| | - Ting Wang
- Tianjin Key Laboratory of Urban Transport Emission Research, State Environmental Protection Key Laboratory of Urban Ambient Air Particulate Matter Pollution Prevention and Control, College of Environmental Science and Engineering Nankai University Tianjin China
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Qi Z, Zhang Y, Chen ZF, Yang C, Song Y, Liao X, Li W, Tsang SY, Liu G, Cai Z. Chemical identity and cardiovascular toxicity of hydrophobic organic components in PM 2.5. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 201:110827. [PMID: 32535366 DOI: 10.1016/j.ecoenv.2020.110827] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 05/25/2020] [Accepted: 05/27/2020] [Indexed: 06/11/2023]
Abstract
Numerous experimental and epidemiological studies have demonstrated that exposure to PM2.5 may result in pathogenesis of several major cardiovascular diseases (CVDs), which can be attributed to the combined adverse effects induced by the complicated components of PM2.5. Organic materials, which are major components of PM2.5, contain thousands of chemicals, and most of them are environmental hazards. However, the contamination profile and contribution to overall toxicity of PM2.5-bound organic components (OCs) have not been thoroughly evaluated yet. Herein, we aim to provide an overview of the literature on PM2.5-bound hydrophobic OCs, with an emphasis on the chemical identity and reported impairments on the cardiovascular system, including the potential exposure routes and mechanisms. We first provide an update on the worldwide mass concentration and composition data of PM2.5, and then, review the contamination profile of PM2.5-bound hydrophobic OCs, including constitution, concentration, distribution, formation, source, and identification. In particular, the link between exposure to PM2.5-bound hydrophobic OCs and CVDs and its possible underlying mechanisms are discussed to evaluate the possible risks of PM2.5-bound hydrophobic OCs on the cardiovascular system and to provide suggestions for future studies.
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Affiliation(s)
- Zenghua Qi
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yanhao Zhang
- State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, Hong Kong, China
| | - Zhi-Feng Chen
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Chun Yang
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Yuanyuan Song
- State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, Hong Kong, China
| | - Xiaoliang Liao
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Weiquan Li
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Suk Ying Tsang
- School of Life Sciences, The Chinese University of Hong Kong, Hong Kong, China
| | - Guoguang Liu
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China
| | - Zongwei Cai
- Guangzhou Key Laboratory of Environmental Catalysis and Pollution Control, Guangdong Key Laboratory of Environmental Catalysis and Health Risk Control, School of Environmental Science and Engineering, Institute of Environmental Health and Pollution Control, Guangdong University of Technology, Guangzhou, 510006, China; State Key Laboratory of Environmental and Biological Analysis, Department of Chemistry, Hong Kong Baptist University, Hong Kong, China.
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Wang J, Li T, Lv Y, Kraus VB, Zhang Y, Mao C, Yin Z, Shi W, Zhou J, Zheng T, Kinney PL, Ji J, Tang S, Shi X. Fine Particulate Matter and Poor Cognitive Function among Chinese Older Adults: Evidence from a Community-Based, 12-Year Prospective Cohort Study. ENVIRONMENTAL HEALTH PERSPECTIVES 2020; 128:67013. [PMID: 32551881 PMCID: PMC7302441 DOI: 10.1289/ehp5304] [Citation(s) in RCA: 49] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/10/2019] [Revised: 05/14/2020] [Accepted: 05/27/2020] [Indexed: 05/07/2023]
Abstract
BACKGROUND Research on the relationship between long-term exposure to particulate matter with aerodynamic diameter ≤ 2.5 μ m (PM 2.5 ) and poor cognitive function is lacking in developing countries, especially in highly polluted areas. OBJECTIVES We evaluated associations of long-term exposure to PM 2.5 with poor cognitive function in a diverse, national sample of older adults in China. METHODS This analysis included data on 13,324 older adults (5,879 who were 65-79 years of age, 3,052 who were 80-89 years of age, 2,634 who were 90-99 years of age, and 1,759 who were ≥ 100 years of age) with normal cognitive function at baseline from March 2002 to September 2014, with 64,648 person-years of follow-up. We used a geographic information system analysis to estimate the annual average satellite-derived PM 2.5 concentration for the geocoded location of the participants' baseline residences. Poor cognitive function was defined as a score of less than 18 on the Chinese version of the Mini-Mental State Examination (MMSE). Competing risk models were performed to explore the association of PM 2.5 with poor cognitive function. RESULTS Each 10 - μ g / m 3 increase in PM 2.5 was associated with a 5.1% increased risk of poor cognitive function [adjusted hazard ratio (HR): 1.051; 95% confidence interval (CI): 1.023, 1.079]. Compared to the lowest quartile of PM 2.5 (< 41.4 μ g / m 3 ), adjusted HR values were 1.20 (95% CI: 1.09, 1.33), 1.27 (95% CI: 1.15, 1.41), and 1.21 (95% CI: 1.09, 1.34) for the second (≥ 41.4 - 50.3 ug / m 3 ), third (≥ 50.3 - 60.7 μ g / m 3 ), and fourth (≥ 60.7 μ g / m 3 ) quartiles of PM 2.5 , respectively (p for trend < 0.001 ). Subgroup analyses suggested stronger associations between PM 2.5 and poor cognitive impairment in men than women. The association was positive in the 65- to 79- and ≥ 100 - y age group but not significant and positive in the other two age groups with similar results. CONCLUSION PM 2.5 was identified as a risk factor for poor cognitive function in Chinese older adults. Improving air quality may reduce the future population burden of poor cognitive function, especially in areas with high air pollution. https://doi.org/10.1289/EHP5304.
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Affiliation(s)
- Jiaonan Wang
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China
- Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Tiantian Li
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China
- Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Yuebin Lv
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Virginia Byers Kraus
- Duke Molecular Physiology Institute, Duke University School of Medicine, Durham, North Carolina, USA
- Department of Medicine, Duke University School of Medicine, Durham, North Carolina, USA
| | - Yi Zhang
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Chen Mao
- Division of Epidemiology, School of Public Health, Southern Medical University, Guangzhou, Guangdong, China
| | - Zhaoxue Yin
- Division of Non-Communicable Disease Control and Community Health, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Wanying Shi
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Jinhui Zhou
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China
| | - Tongzhang Zheng
- Epidemiology Department, Brown University, Providence, Rhode Island, USA
| | - Patrick L Kinney
- Department of Environmental Health, Boston University School of Public Health, Boston, USA
| | - John Ji
- Environmental Health Science, Duke Kunshan University, Kunshan, Jiangsu, China
- Environmental Sciences and Policy, Nicholas School of the Environment, Duke University, Durham, North Carolina, USA
| | - Song Tang
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China
- Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Xiaoming Shi
- National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, China
- Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu, China
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10
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Xu Z, Wu H, Zhang H, Bai J, Zhang Z. Interleukins 6/8 and cyclooxygenase-2 release and expressions are regulated by oxidative stress-JAK2/STAT3 signaling pathway in human bronchial epithelial cells exposed to particulate matter ≤2.5 μm. J Appl Toxicol 2020; 40:1210-1218. [PMID: 32212198 DOI: 10.1002/jat.3977] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2020] [Revised: 02/19/2020] [Accepted: 03/04/2020] [Indexed: 01/06/2023]
Abstract
Atmospheric particulate matter with a diameter ≤2.5 μm (PM2.5) can induce inflammation of the respiratory system, which is the pathological basis of asthma or other respiratory diseases; however, the underlying regulation mechanism has not been clearly addressed. The aim of this study was to explore the potential role of the oxidative stress-JAK/STAT signaling pathway in the inflammation of human bronchial epithelial cells induced by PM2.5. The human bronchial epithelial cell line 16HBE cells were stimulated with PM2.5 at 50 and 100 μg/mL doses for 12 or 24 hours. Intracellular reactive oxygen species (ROS) was detected using flow cytometry. Gene and protein expressions of JAK2, STAT3 and cyclooxygenase 2 (COX-2) were determined using reverse transcription-polymerase chain reaction and western blotting, respectively. The ratio of intracellular glutathione/glutathione disulfide (GSH/GSSG) and the levels of interleukin (IL)-6 and IL-8 in cellular supernatant were analyzed using enzyme-linked immunosorbent assay. The results indicated that PM2.5 treatment significantly increased gene expressions of JAK2/STAT3 and protein levels of p-JAK2/p-STAT3, accompanied by increased intracellular ROS levels, decreased GSH/GSSG ratio at 50 and 100 μg/mL of PM2.5, and significantly enhanced levels of IL-6, IL-8 and COX-2 at a dose of 100 μg/mL. Pretreatment with N-acetyl-l-cysteine (NAC) attenuated the oxidative stress induced by PM2.5; similarly, pretreatment with AG490 (an inhibitor of JAK) decreased the cytokine levels stimulated by PM2.5. Therefore, we concluded that PM2.5 exposure could activate oxidative stress-JAK2/STAT3 signaling pathway, elevate the levels of IL-6, IL-8 and COX-2 in 16HBE cells, which can be inhibited by the NAC or AG490.
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Affiliation(s)
- Zhenzhen Xu
- Department of Environmental Health, School of Public Health, Shanxi Medical University, Taiyuan, Shanxi Province, China
| | - Hongyan Wu
- Department of Environmental Health, School of Public Health, Shanxi Medical University, Taiyuan, Shanxi Province, China
| | - Hongmei Zhang
- Department of Environmental Health, School of Public Health, Shanxi Medical University, Taiyuan, Shanxi Province, China
| | - Jianying Bai
- Department of Environmental Health, School of Public Health, Shanxi Medical University, Taiyuan, Shanxi Province, China
| | - Zhihong Zhang
- Department of Environmental Health, School of Public Health, Shanxi Medical University, Taiyuan, Shanxi Province, China
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Schwartz J, Fong K, Zanobetti A. A National Multicity Analysis of the Causal Effect of Local Pollution, [Formula: see text], and [Formula: see text] on Mortality. ENVIRONMENTAL HEALTH PERSPECTIVES 2018; 126:087004. [PMID: 30235421 PMCID: PMC6375387 DOI: 10.1289/ehp2732] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2017] [Revised: 07/11/2018] [Accepted: 07/17/2018] [Indexed: 05/06/2023]
Abstract
BACKGROUND Studies have long associated [Formula: see text] with daily mortality, but few applied causal-modeling methods, or at low exposures. Short-term exposure to [Formula: see text], a marker of local traffic, has also been associated with mortality but is less studied. We previously found a causal effect between local air pollution and mortality in Boston. OBJECTIVES We aimed to estimate the causal effects of local pollution, [Formula: see text], and [Formula: see text] on mortality in 135 U.S. cities. METHODS We used three methods which, under different assumptions, provide causal marginal estimates of effect: a marginal structural model, an instrumental variable analysis, and a negative exposure control. The instrumental approach used planetary boundary layer, wind speed, and air pressure as instruments for concentrations of local pollutants; the marginal structural model separated the effects of [Formula: see text] from the effects of [Formula: see text], and the negative exposure control provided protection against unmeasured confounders. RESULTS In 7.3 million deaths, the instrumental approach estimated that mortality increased 1.5% [95% confidence interval (CI): 1.1%, 2.0%] per [Formula: see text] increase in local pollution indexed as [Formula: see text]. The negative control exposure was not associated with mortality. Restricting our analysis to days with [Formula: see text] below [Formula: see text], we found a 1.70% (95% CI 1.11%, 2.29%) increase. With marginal structural models, we found positive significant increases in deaths with both [Formula: see text] and [Formula: see text]. On days with [Formula: see text] below [Formula: see text], we found a 0.83% (95% CI 0.39%, 1.27%) increase. Including negative exposure controls changed estimates minimally. CONCLUSIONS Causal-modeling techniques, each subject to different assumptions, demonstrated causal effects of locally generated pollutants on daily deaths with effects at concentrations below the current EPA daily [Formula: see text] standard. https://doi.org/10.1289/EHP2732.
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Affiliation(s)
- Joel Schwartz
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
- Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Kelvin Fong
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
| | - Antonella Zanobetti
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
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12
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Zhu J, Zhu LWS, Yang JH, Xu YL, Wang C, Li ZY, Mao W, Lu DZ. Proteomic analysis of human umbilical vein endothelial cells exposed to PM2.5. J Zhejiang Univ Sci B 2018. [DOI: 10.1631/jzus.b1700103] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Niemann B, Rohrbach S, Miller MR, Newby DE, Fuster V, Kovacic JC. Oxidative Stress and Cardiovascular Risk: Obesity, Diabetes, Smoking, and Pollution: Part 3 of a 3-Part Series. J Am Coll Cardiol 2017; 70:230-251. [PMID: 28683970 DOI: 10.1016/j.jacc.2017.05.043] [Citation(s) in RCA: 198] [Impact Index Per Article: 28.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/16/2017] [Revised: 04/25/2017] [Accepted: 05/10/2017] [Indexed: 12/16/2022]
Abstract
Oxidative stress occurs whenever the release of reactive oxygen species (ROS) exceeds endogenous antioxidant capacity. In this paper, we review the specific role of several cardiovascular risk factors in promoting oxidative stress: diabetes, obesity, smoking, and excessive pollution. Specifically, the risk of developing heart failure is higher in patients with diabetes or obesity, even with optimal medical treatment, and the increased release of ROS from cardiac mitochondria and other sources likely contributes to the development of cardiac dysfunction in this setting. Here, we explore the role of different ROS sources arising in obesity and diabetes, and the effect of excessive ROS production on the development of cardiac lipotoxicity. In parallel, contaminants in the air that we breathe pose a significant threat to human health. This paper provides an overview of cigarette smoke and urban air pollution, considering how their composition and biological effects have detrimental effects on cardiovascular health.
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Affiliation(s)
- Bernd Niemann
- Department of Adult and Pediatric Cardiovascular Surgery, University Hospital Giessen, Giessen, Germany
| | - Susanne Rohrbach
- Institute of Physiology, Justus-Liebig University, Giessen, Germany.
| | - Mark R Miller
- BHF/University of Edinburgh Centre for Cardiovascular Science, The Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom
| | - David E Newby
- BHF/University of Edinburgh Centre for Cardiovascular Science, The Queen's Medical Research Institute, University of Edinburgh, Edinburgh, United Kingdom.
| | - Valentin Fuster
- The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, New York; Marie-Josée and Henry R. Kravis Cardiovascular Health Center, Icahn School of Medicine at Mount Sinai, New York, New York; Centro Nacional de Investigaciones Cardiovasculares, Madrid, Spain
| | - Jason C Kovacic
- The Zena and Michael A. Wiener Cardiovascular Institute, Icahn School of Medicine at Mount Sinai, New York, New York.
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14
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Jung S, Lim J, Kwon S, Jeon S, Kim J, Lee J, Kim S. Characterization of particulate matter from diesel passenger cars tested on chassis dynamometers. J Environ Sci (China) 2017; 54:21-32. [PMID: 28391931 DOI: 10.1016/j.jes.2016.01.035] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Revised: 01/12/2016] [Accepted: 01/15/2016] [Indexed: 06/07/2023]
Abstract
Emission characterization of particle number as well as particle mass from three diesel passenger cars equipped with diesel particulate filter (DPF), diesel oxidation catalyst (DOC) and exhaust gas recirculation (EGR) under the vehicle driving cycles and regulatory cycle. Total particle number emissions (PNEs) decreased gradually during speed-up of vehicle from 17.3 to 97.3km/hr. As the average vehicle speed increases, the size-segregated peak of particle number concentration shifts to smaller size ranges of particles. The correlation analysis with various particulate components such as particle number concentration (PNC), ultrafine particle number concentration (UFPNC) and particulate matter (PM) mass was conducted to compare gaseous compounds (CO, CO2, HC and NOx). The UFPNC and PM were not only emitted highly in Seoul during severe traffic jam conditions, but also have good correlation with hydrocarbons and NOx influencing high potential on secondary aerosol generation. The effect of the dilution temperature on total PNC under the New European Driving Cycle (NEDC), was slightly higher than the dilution ratio. In addition, the nuclei mode (DP: ≤13nm) was confirmed to be more sensitive to the dilution temperature rather than other particle size ranges. Comparison with particle composition between vehicle speed cycles and regulatory cycle showed that sulfate was slightly increased at regulatory cycle, while other components were relatively similar. During cold start test, semivolatile nucleation particles were increased due to effect of cold environment. Research on particle formation dependent on dilution conditions of diesel passenger cars under the NEDC is important to verify impact on vehicular traffic and secondary aerosol formation in Seoul.
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Affiliation(s)
- Sungwoon Jung
- Transportation Pollution Research Center, National Institute of Environmental Research, Incheon, Republic of Korea.
| | - Jaehyun Lim
- Division of Global Environment Research, National Institute of Environmental Research, Incheon, Republic of Korea
| | - Sangil Kwon
- Transportation Pollution Research Center, National Institute of Environmental Research, Incheon, Republic of Korea
| | - Sangwoo Jeon
- Compliance & Defects Investigation Office, Korea Automobile Testing & Research Institute, Hwasung, Republic of Korea
| | - Jeongsoo Kim
- Transportation Pollution Research Center, National Institute of Environmental Research, Incheon, Republic of Korea
| | - Jongtae Lee
- Transportation Pollution Research Center, National Institute of Environmental Research, Incheon, Republic of Korea
| | - Sunmoon Kim
- Transportation Pollution Research Center, National Institute of Environmental Research, Incheon, Republic of Korea
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Barth A, Brucker N, Moro AM, Nascimento S, Goethel G, Souto C, Fracasso R, Sauer E, Altknecht L, da Costa B, Duarte M, Menezes CB, Tasca T, Arbo MD, Garcia SC. Association between inflammation processes, DNA damage, and exposure to environmental pollutants. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:353-362. [PMID: 27718115 DOI: 10.1007/s11356-016-7772-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Accepted: 09/22/2016] [Indexed: 06/06/2023]
Abstract
Environmental exposure to pollutants, especially polycyclic aromatic hydrocarbons (PAHs), could lead to carcinogenesis development. However, there is a gap on the mechanisms involved in this effect. Therefore, the aim of this study was to investigate the potential relationship between exposure to environmental air pollution and inflammation process in DNA damage in taxi drivers. This study included 45 taxi drivers and 40 controls; non-smokers composed both groups. Biological monitoring was performed through quantification of urinary 1-hydroxypyrene (1-OHP). ICAM-1 (CD54) expression, NTPDase activity, inflammatory cytokine (IL-1β, IL-6, IL-10, TNF-α and IFN-γ) levels, and comet and micronucleus assays were evaluated. The results demonstrated that 1-OHP levels, ICAM-1 expression, NTPDase activity, and DNA damage biomarkers (% tail DNA and micronucleus frequency) were increased in taxi drivers compared to the control group (p < 0.01). Moreover, significant associations were found between 1-OHP levels and ICAM-1 expression, % tail DNA, and micronucleus frequency (p < 0.05). Besides, pro-inflammatory cytokine levels were positively correlated to % tail DNA and micronucleus frequency (p < 0.001). Our findings suggest an important association between environmental exposure to air pollution with increase of ICAM-1 expression and NTPDase activity in taxi drivers. Additionally, the multiple regression linear-analysis demonstrated association between IL-6 and DNA damage. Thus, the present study has provided important evidence that, in addition to environmental exposure to air pollutants, the inflammation process may contribute to DNA damage.
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Affiliation(s)
- Anelise Barth
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
| | - Natália Brucker
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
| | - Angela M Moro
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
| | - Sabrina Nascimento
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
- Post-graduate Program in Pharmaceutical Sciences, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Gabriela Goethel
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
- Post-graduate Program in Pharmaceutical Sciences, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Caroline Souto
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
| | - Rafael Fracasso
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
| | - Elisa Sauer
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
- Post-graduate Program in Pharmaceutical Sciences, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Louise Altknecht
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
| | - Bárbara da Costa
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
| | - Marta Duarte
- Department of Health Sciences, Lutheran University of Brazil, Santa Maria, RS, Brazil
| | - Camila B Menezes
- Post-graduate Program in Pharmaceutical Sciences, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
- Laboratory of Research in Parasitology, Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Tiana Tasca
- Post-graduate Program in Pharmaceutical Sciences, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
- Laboratory of Research in Parasitology, Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Marcelo D Arbo
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil
- Post-graduate Program in Pharmaceutical Sciences, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Solange Cristina Garcia
- Laboratory of Toxicology (LATOX), Department of Analysis, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Avenida Ipiranga 2752, Santa Cecília, Porto Alegre, RS, CEP.: 90610-000, Brazil.
- Post-graduate Program in Pharmaceutical Sciences, Faculty of Pharmacy, Federal University of Rio Grande do Sul, Porto Alegre, RS, Brazil.
- Institute of Cardiology, University Cardiology Foundation, Porto Alegre, RS, Brazil.
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Schwartz J, Bind MA, Koutrakis P. Estimating Causal Effects of Local Air Pollution on Daily Deaths: Effect of Low Levels. ENVIRONMENTAL HEALTH PERSPECTIVES 2017; 125:23-29. [PMID: 27203595 PMCID: PMC5226700 DOI: 10.1289/ehp232] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Revised: 09/07/2015] [Accepted: 05/04/2016] [Indexed: 05/18/2023]
Abstract
BACKGROUND Although many time-series studies have established associations of daily pollution variations with daily deaths, there are fewer at low concentrations, or focused on locally generated pollution, which is becoming more important as regulations reduce regional transport. Causal modeling approaches are also lacking. OBJECTIVE We used causal modeling to estimate the impact of local air pollution on mortality at low concentrations. METHODS Using an instrumental variable approach, we developed an instrument for variations in local pollution concentrations that is unlikely to be correlated with other causes of death, and examined its association with daily deaths in the Boston, Massachusetts, area. We combined height of the planetary boundary layer and wind speed, which affect concentrations of local emissions, to develop the instrument for particulate matter ≤ 2.5 μm (PM2.5), black carbon (BC), or nitrogen dioxide (NO2) variations that were independent of year, month, and temperature. We also used Granger causality to assess whether omitted variable confounding existed. RESULTS We estimated that an interquartile range increase in the instrument for local PM2.5 was associated with a 0.90% increase in daily deaths (95% CI: 0.25, 1.56). A similar result was found for BC, and a weaker association with NO2. The Granger test found no evidence of omitted variable confounding for the instrument. A separate test confirmed the instrument was not associated with mortality independent of pollution. Furthermore, the association remained when all days with PM2.5 concentrations > 30 μg/m3 were excluded from the analysis (0.84% increase in daily deaths; 95% CI: 0.19, 1.50). CONCLUSIONS We conclude that there is a causal association of local air pollution with daily deaths at concentrations below U.S. EPA standards. The estimated attributable risk in Boston exceeded 1,800 deaths during the study period, indicating that important public health benefits can follow from further control efforts. Citation: Schwartz J, Bind MA, Koutrakis P. 2017. Estimating causal effects of local air pollution on daily deaths: effect of low levels. Environ Health Perspect 125:23-29; http://dx.doi.org/10.1289/EHP232.
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Affiliation(s)
- Joel Schwartz
- Address correspondence to J. Schwartz, Department of Environmental Health, Harvard T.H. Chan School of Public Health, Landmark Center 404-M, 401 Park Dr., Boston, MA 02215 USA. Telephone: (617) 384-8752. E-mail:
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Potential Harmful Effects of PM2.5 on Occurrence and Progression of Acute Coronary Syndrome: Epidemiology, Mechanisms, and Prevention Measures. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2016; 13:ijerph13080748. [PMID: 27463723 PMCID: PMC4997434 DOI: 10.3390/ijerph13080748] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 06/02/2016] [Revised: 07/13/2016] [Accepted: 07/20/2016] [Indexed: 12/18/2022]
Abstract
The harmful effects of particulate matter with an aerodynamic diameter of <2.5 µm (PM2.5) and its association with acute coronary syndrome (ACS) has gained increased attention in recent years. Significant associations between PM2.5 and ACS have been found in most studies, although sometimes only observed in specific subgroups. PM2.5-induced detrimental effects and ACS arise through multiple mechanisms, including endothelial injury, an enhanced inflammatory response, oxidative stress, autonomic dysfunction, and mitochondria damage as well as genotoxic effects. These effects can lead to a series of physiopathological changes including coronary artery atherosclerosis, hypertension, an imbalance between energy supply and demand to heart tissue, and a systemic hypercoagulable state. Effective strategies to prevent the harmful effects of PM2.5 include reducing pollution sources of PM2.5 and population exposure to PM2.5, and governments and organizations publicizing the harmful effects of PM2.5 and establishing air quality standards for PM2.5. PM2.5 exposure is a significant risk factor for ACS, and effective strategies with which to prevent both susceptible and healthy populations from an increased risk for ACS have important clinical significance in the prevention and treatment of ACS.
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18
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Sauvain JJ, Rossi MJ. Quantitative Aspects of the Interfacial Catalytic Oxidation of Dithiothreitol by Dissolved Oxygen in the Presence of Carbon Nanoparticles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:996-1004. [PMID: 26683500 DOI: 10.1021/acs.est.5b04958] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The catalytic nature of particulate matter is often advocated to explain its ability to generate reactive oxygen species, but quantitative data are lacking. We have performed molecular characterization of three different carbonaceous nanoparticles (NP) by 1. identifying and quantifying their surface functional groups based on probe gas-particle titration; 2. studying the kinetics of dissolved oxygen consumption in the presence of suspended NP's and dithiothreitol (DTT). We show that these NP's can reversibly change their oxidation state between oxidized and reduced functional groups present on the NP surface. By comparing the amount of O2 consumed and the number of strongly reducing sites on the NP, its average turnover ranged from 35 to 600 depending on the type of NP. The observed quadratic rate law for O2 disappearance points to a Langmuir-Hinshelwood surface-based reaction mechanism possibly involving semiquinone radical. In the proposed model, the strongly reducing surface site is assumed to be a polycyclic aromatic hydroquinone whose oxidation to the corresponding conjugated quinone is rate-limiting in the catalytic chain reaction. The presence and strength of the reducing surface functional groups are important for explaining the catalytic activity of NP in the presence of oxygen and a reducing agent like DTT.
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Affiliation(s)
- Jean-Jacques Sauvain
- Institute for Work and Health (IST), University of Lausanne and Geneva , Route de la Corniche 2, CH-1066 Epalinges-Lausanne, Switzerland
| | - Michel J Rossi
- Paul Scherrer Institute (PSI), Laboratory of Atmospheric Chemistry (LAC) , CH-5232 Villigen PSI, Switzerland
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Fougère B, Vellas B, Billet S, Martin PJ, Gallucci M, Cesari M. Air Pollution modifies the association between successful and pathological aging throughout the frailty condition. Ageing Res Rev 2015; 24:299-303. [PMID: 26462883 DOI: 10.1016/j.arr.2015.09.004] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 09/23/2015] [Accepted: 09/28/2015] [Indexed: 01/27/2023]
Abstract
The rapid growth in the number of older adults has many implications for public health, including the need to better understand the risks posed by environmental exposures. Aging leads to a decline and deterioration of functional properties at the cellular, tissue and organ level. This loss of functional properties yields to a loss of homeostasis and decreased adaptability to internal and external stress. Frailty is a geriatric syndrome characterized by weakness, weight loss, and low activity that is associated with adverse health outcomes. Frailty manifests as an age-related, biological vulnerability to stressors and decreased physiological reserves. Ambient air pollution exposure affects human health, and elderly people appear to be particularly susceptible to its adverse effects. The aim of this paper is to discuss the role of air pollution in the modulation of several biological mechanisms involved in aging. Evidence is presented on how air pollution can modify the bidirectional association between successful and pathological aging throughout the frailty conditions.
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Affiliation(s)
- Bertrand Fougère
- Gérontopôle, Centre Hospitalier Universitaire de Toulouse, Toulouse, France; Inserm UMR1027, Université de Toulouse III Paul Sabatier, Toulouse, France.
| | - Bruno Vellas
- Gérontopôle, Centre Hospitalier Universitaire de Toulouse, Toulouse, France; Inserm UMR1027, Université de Toulouse III Paul Sabatier, Toulouse, France
| | - Sylvain Billet
- Unité de Chimie Environnementale et Interactions sur le Vivant (EA4492), Université du Littoral Côte d'Opale, Dunkerque, France
| | - Perrine J Martin
- Unité de Chimie Environnementale et Interactions sur le Vivant (EA4492), Université du Littoral Côte d'Opale, Dunkerque, France
| | - Maurizio Gallucci
- Cognitive Impairment Centre, General Hospital of Treviso, Piazza Ospedale, 1, I-31100 Treviso, Italy; FORGEI, Interdisciplinary Geriatric Research Foundation, Viale Trento Trieste 19, I-31100 Treviso, Italy
| | - Matteo Cesari
- Gérontopôle, Centre Hospitalier Universitaire de Toulouse, Toulouse, France; Inserm UMR1027, Université de Toulouse III Paul Sabatier, Toulouse, France
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Fox JR, Cox DP, Drury BE, Gould TR, Kavanagh TJ, Paulsen MH, Sheppard L, Simpson CD, Stewart JA, Larson TV, Kaufman JD. Chemical characterization and in vitro toxicity of diesel exhaust particulate matter generated under varying conditions. AIR QUALITY, ATMOSPHERE, & HEALTH 2015; 8:507-519. [PMID: 26539254 PMCID: PMC4628827 DOI: 10.1007/s11869-014-0301-8] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Epidemiologic studies have linked diesel exhaust (DE) to cardiovascular and respiratory morbidity and mortality, as well as lung cancer. DE composition is known to vary with many factors, although it is unclear how this influences toxicity. We generated eight DE atmospheres by applying a 2×2×2 factorial design and altering three parameters in a controlled exposure facility: (1) engine load (27 vs 82 %), (2) particle aging (residence time ~5 s vs ~5 min prior to particle collection), and (3) oxidation (with or without ozonation during dilution). Selected exposure concentrations of both diesel exhaust particles (DEPs) and DE gases, DEP oxidative reactivity via DTT activity, and in vitro DEP toxicity in murine endothelial cells were measured for each DE atmosphere. Cell toxicity was assessed via measurement of cell proliferation (colony formation assay), cell viability (MTT assay), and wound healing (scratch assay). Differences in DE composition were observed as a function of engine load. The mean 1-nitropyrene concentration was 15 times higher and oxidative reactivity was two times higher for low engine load versus high load. There were no substantial differences in measured toxicity among the three DE exposure parameters. These results indicate that alteration of applied engine load shifts the composition and can modify the biological reactivity of DE. While engine conditions did not affect the selected in vitro toxicity measures, the change in oxidative reactivity suggests that toxicological studies with DE need to take into account engine conditions in characterizing biological effects.
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Affiliation(s)
- Julie Richman Fox
- Department of Environmental & Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - David P. Cox
- Department of Environmental & Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | | | - Timothy R. Gould
- Department of Civil & Environmental Engineering, University of Washington, Seattle, WA, USA
| | - Terrance J. Kavanagh
- Department of Environmental & Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Michael H. Paulsen
- Department of Environmental & Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Lianne Sheppard
- Department of Environmental & Occupational Health Sciences, University of Washington, Seattle, WA, USA. Department of Biostatistics, University of Washington, Seattle, WA, USA
| | - Christopher D. Simpson
- Department of Environmental & Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - James A. Stewart
- Department of Environmental & Occupational Health Sciences, University of Washington, Seattle, WA, USA
| | - Timothy V. Larson
- Department of Environmental & Occupational Health Sciences, University of Washington, Seattle, WA, USA. Department of Civil & Environmental Engineering, University of Washington, Seattle, WA, USA
| | - Joel D. Kaufman
- Department of Environmental & Occupational Health Sciences, University of Washington, Seattle, WA, USA
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Lim J, Lim C, Kim S, Hong J. Characterizations of organic compounds in diesel exhaust particulates. J Environ Sci (China) 2015; 34:171-183. [PMID: 26257360 DOI: 10.1016/j.jes.2015.03.013] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 03/17/2015] [Accepted: 03/18/2015] [Indexed: 06/04/2023]
Abstract
To characterize how the speed and load of a medium-duty diesel engine affected the organic compounds in diesel particle matter (PM) below 1 μm, four driving conditions were examined. At all four driving conditions, concentration of identifiable organic compounds in PM ultrafine (34-94 nm) and accumulation (94-1000 nm) modes ranged from 2.9 to 5.7 μg/m(3) and 9.5 to 16.4 μg/m(3), respectively. As a function of driving conditions, the non-oxygen-containing organics exhibited a reversed concentration trend to the oxygen-containing organics. The identified organic compounds were classified into eleven classes: alkanes, alkenes, alkynes, aromatic hydrocarbons, carboxylic acids, esters, ketones, alcohols, ethers, nitrogen-containing compounds, and sulfur-containing compounds. At all driving conditions, alkane class consistently showed the highest concentration (8.3 to 18.0 μg/m(3)) followed by carboxylic acid, esters, ketones and alcohols. Twelve polycyclic aromatic hydrocarbons (PAHs) were identified with a total concentration ranging from 37.9 to 174.8 ng/m(3). In addition, nine nitrogen-containing polycyclic aromatic compounds (NPACs) were identified with a total concentration ranging from 7.0 to 10.3 ng/m(3). The most abundant PAH (phenanthrene) and NPACs (7,8-benzoquinoline and 3-nitrophenanthrene) comprise a similar molecular (3 aromatic-ring) structure under the highest engine speed and engine load.
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Affiliation(s)
- Jaehyun Lim
- Division of Global Environment Research, National Institute of Environmental Research, Incheon, Republic of Korea.
| | - Cheolsoo Lim
- Division of Global Environment Research, National Institute of Environmental Research, Incheon, Republic of Korea
| | - Sangkyun Kim
- Division of Global Environment Research, National Institute of Environmental Research, Incheon, Republic of Korea
| | - Jihyung Hong
- Department of Climate and Air Quality Research, National Institute of Environmental Research, Incheon, Republic of Korea
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Lawal A, Zhang M, Dittmar M, Lulla A, Araujo JA. Heme oxygenase-1 protects endothelial cells from the toxicity of air pollutant chemicals. Toxicol Appl Pharmacol 2015; 284:281-291. [PMID: 25620054 DOI: 10.1016/j.taap.2015.01.010] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2015] [Accepted: 01/12/2015] [Indexed: 01/22/2023]
Abstract
Diesel exhaust particles (DEPs) are a major component of diesel emissions, responsible for a large portion of their toxicity. In this study, we examined the toxic effects of DEPs on endothelial cells and the role of DEP-induced heme oxygenase-1 (HO-1) expression. Human microvascular endothelial cells (HMECs) were treated with an organic extract of DEPs from an automobile engine (A-DEP) or a forklift engine (F-DEP) for 1 and 4h. ROS generation, cell viability, lactate dehydrogenase leakage, expression of HO-1, inflammatory genes, cell adhesion molecules and unfolded protein respone (UPR) gene were assessed. HO-1 expression and/or activity were inhibited by siRNA or tin protoporphyrin (Sn PPIX) and enhanced by an expression plasmid or cobalt protoporphyrin (CoPPIX). Exposure to 25μg/ml of A-DEP and F-DEP significantly induced ROS production, cellular toxicity and greater levels of inflammatory and cellular adhesion molecules but to a different degree. Inhibition of HO-1 enzymatic activity with SnPPIX and silencing of the HO-1 gene by siRNA enhanced DEP-induced ROS production, further decreased cell viability and increased expression of inflammatory and cell adhesion molecules. On the other hand, overexpression of the HO-1 gene by a pcDNA 3.1D/V5-HO-1 plasmid significantly mitigated ROS production, increased cell survival and decreased the expression of inflammatory genes. HO-1 expression protected HMECs from DEP-induced prooxidative and proinflammatory effects. Modulation of HO-1 expression could potentially serve as a therapeutic target in an attempt to inhibit the cardiovascular effects of ambient PM.
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Affiliation(s)
- Akeem Lawal
- Division of Cardiology, David Geffen School of Medicine, University of California-Los Angeles, 10833 Le Conte Avenue, CHS 43-264, Los Angeles, CA 90095
| | - Min Zhang
- Division of Cardiology, David Geffen School of Medicine, University of California-Los Angeles, 10833 Le Conte Avenue, CHS 43-264, Los Angeles, CA 90095
| | - Michael Dittmar
- Division of Cardiology, David Geffen School of Medicine, University of California-Los Angeles, 10833 Le Conte Avenue, CHS 43-264, Los Angeles, CA 90095
| | - Aaron Lulla
- Division of Cardiology, David Geffen School of Medicine, University of California-Los Angeles, 10833 Le Conte Avenue, CHS 43-264, Los Angeles, CA 90095
| | - Jesus A Araujo
- Division of Cardiology, David Geffen School of Medicine, University of California-Los Angeles, 10833 Le Conte Avenue, CHS 43-264, Los Angeles, CA 90095
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Tzivian L, Winkler A, Dlugaj M, Schikowski T, Vossoughi M, Fuks K, Weinmayr G, Hoffmann B. Effect of long-term outdoor air pollution and noise on cognitive and psychological functions in adults. Int J Hyg Environ Health 2014; 218:1-11. [PMID: 25242804 DOI: 10.1016/j.ijheh.2014.08.002] [Citation(s) in RCA: 148] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2014] [Revised: 08/20/2014] [Accepted: 08/26/2014] [Indexed: 10/24/2022]
Abstract
It has been hypothesized that air pollution and ambient noise might impact neurocognitive function. Early studies mostly investigated the associations of air pollution and ambient noise exposure with cognitive development in children. More recently, several studies investigating associations with neurocognitive function, mood disorders, and neurodegenerative disease in adult populations were published, yielding inconsistent results. The purpose of this review is to summarize the current evidence on air pollution and noise effects on mental health in adults. We included studies in adult populations (≥18 years old) published in English language in peer-reviewed journals. Fifteen articles related to long-term effects of air pollution and eight articles on long-term effects of ambient noise were extracted. Both exposures were separately shown to be associated with one or several measures of global cognitive function, verbal and nonverbal learning and memory, activities of daily living, depressive symptoms, elevated anxiety, and nuisance. No study considered both exposures simultaneously and few studies investigated progression of neurocognitive decline or psychological factors. The existing evidence generally supports associations of environmental factors with mental health, but does not suffice for an overall conclusion about the independent effect of air pollution and noise. There is a need for studies investigating simultaneously air pollution and noise exposures in association mental health, for longitudinal studies to corroborate findings from cross-sectional analyses, and for parallel toxicological and epidemiological studies to elucidate mechanisms and pathways of action.
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Affiliation(s)
- Lilian Tzivian
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany.
| | - Angela Winkler
- Department of Neurology, University Hospital of Essen, University of Duisburg-Essen, Essen, Germany
| | - Martha Dlugaj
- Department of Neurology, University Hospital of Essen, University of Duisburg-Essen, Essen, Germany
| | - Tamara Schikowski
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany; Swiss Tropical and Public Health Institute, Basel, Switzerland; University of Basel, Basel, Switzerland
| | - Mohammad Vossoughi
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Kateryna Fuks
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Gudrun Weinmayr
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Barbara Hoffmann
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany; Medical Faculty, Heinrich Heine University of Düsseldorf, Düsseldorf, Germany
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Sensing biophysical alterations of human lung epithelial cells (A549) in the context of toxicity effects of diesel exhaust particles. Cell Biochem Biophys 2014; 67:1147-56. [PMID: 23712864 DOI: 10.1007/s12013-013-9618-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Diesel exhaust particles (DEP) in urban air are associated with numerous respiratory diseases. The role of underlying biomechanics in cytotoxicity of individual lung cells relating to DEP exposure is unclear. In this study, atomic force microscopy (AFM), confocal Raman microspectroscopy (RM), and fluorescence (FL) microscopy were used to monitor alterations of single A549 cells exposed to DEP. Results revealed a significant decrease in membrane surface adhesion force and a significant change in cell elasticity as a function of DEP-cell interaction time, and the dynamic changes in cellular biocomponents which were reflected by changes of characteristic Raman bands: 726 cm(-1) (adenine), 782 cm(-1) (uracil, cytosine, thymine), 788 cm(-1) (O-P-O), 1006 cm(-1) (phenylalanine), and 1320 cm(-1) (guanine) after DEP exposure. These findings suggest that the combination of multi-instruments (e.g., AFM/FL) may offer an exciting platform for investigating the roles of biophysical and biochemical responses to particulate matter-induced cell toxicity.
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25
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Janghorbani M, Momeni F, Mansourian M. Systematic review and metaanalysis of air pollution exposure and risk of diabetes. Eur J Epidemiol 2014; 29:231-42. [PMID: 24791705 DOI: 10.1007/s10654-014-9907-2] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2013] [Accepted: 04/23/2014] [Indexed: 12/22/2022]
Abstract
The present systematic review and metaanalysis of published observational studies was conducted to assess the health effects of exposure to air pollution on diabetes risk. Online databases were searched through January 2013, and the reference lists of pertinent articles reporting observational studies in humans were examined. Pooled relative risks and 95 % confidence intervals were calculated with a random-effects model. Exposure to air pollution was associated with slight increase in risk of diabetes and susceptibility of people with diabetes to air pollution. These results were consistent between time-series, case-crossover and cohort studies and between studies conducted in North America and Europe. The association between exposure to air pollution and diabetes was stronger for gaseous pollutants than for particulate matter. Our metaanalysis suggests that exposure to air pollution may be a risk factor for diabetes and increase susceptibility of people with diabetes to air pollution.
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Affiliation(s)
- Mohsen Janghorbani
- Department of Epidemiology and Biostatistics, School of Public Health, Isfahan University of Medical Sciences, Isfahan, Iran,
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26
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Kaur R, Kaur J, Mahajan J, Kumar R, Arora S. Oxidative stress--implications, source and its prevention. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2014; 21:1599-1613. [PMID: 24170504 DOI: 10.1007/s11356-013-2251-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2013] [Accepted: 10/15/2013] [Indexed: 06/02/2023]
Abstract
Oxidative stress has been a major predicament of present day living. It has been the product of imbalance between the processes involved in free radical generation and their neutralization by enzymatic and non-enzymatic defence mechanisms. The oxidative stress has been contributed by numerous factors including heavy metals, organic compound-rich industrial effluents, air pollutants and changing lifestyle pattern focussing mainly on alcohol consumption, dietary habits, sun exposure, nuclear emissions, etc. The most common outcome of oxidative stress is the increased damage of lipid, DNA and proteins that resulted in the development of different pathologies. Among these pathologies, cancer is the most devastating and linked to multiple mutations arising due to oxidative DNA and protein damage that ultimately affect the integrity of the genome. The chemopreventive agents particularly nutraceuticals are found to be effective in reducing cancer incidences as these components have immense antioxidative, antimutagenic and antiproliferative potentials and are an important part of our dietary components. These secondary metabolites, due to their unique chemical structure, facilitate cell-to-cell communication, repair DNA damage by the downregulation of transcription factors and inhibit the activity of protein kinases and cytochrome P450-dependent mixed function oxidases. These phytochemicals, therefore, are most appropriate in combating oxidative stress-related disorders due to their tendency to exert better protective effect without having any distinct side effect.
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Affiliation(s)
- Rajbir Kaur
- Department of Botany, Sri Guru Teg Bahadur Khalsa College, Sri Anandpur Sahib, Ropar, 140118, Punjab, India.
| | - Jasmit Kaur
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, 143005, Punjab, India
| | - Jyoti Mahajan
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, 143005, Punjab, India
| | - Rakesh Kumar
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, 143005, Punjab, India
| | - Saroj Arora
- Department of Botanical and Environmental Sciences, Guru Nanak Dev University, Amritsar, 143005, Punjab, India
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27
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Zanobetti A, Coull BA, Gryparis A, Kloog I, Sparrow D, Vokonas PS, Wright RO, Gold DR, Schwartz J. Associations between arrhythmia episodes and temporally and spatially resolved black carbon and particulate matter in elderly patients. Occup Environ Med 2013; 71:201-7. [PMID: 24142987 DOI: 10.1136/oemed-2013-101526] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
OBJECTIVES Ambient air pollution has been associated with sudden deaths, some of which are likely due to ventricular arrhythmias. Defibrillator discharge studies have examined the association of air pollution with arrhythmias in sensitive populations. No studies have assessed this association using residence-specific estimates of air pollution exposure. METHODS In the Normative Aging Study, we investigated the association between temporally resolved and spatially resolved black carbon (BC) and PM2.5 and arrhythmia episodes (bigeminy, trigeminy or couplets episodes) measured as ventricular ectopy (VE) by 4 min ECG monitoring in repeated measures of 701 subjects, during the years 2000-2010. We used a binomial distribution (having or not a VE episode) in a mixed effect model with a random intercept for subject, controlling for seasonality, temperature, day of the week, medication use, smoking, having diabetes, body mass index and age. We also examined whether these associations were modified by genotype or phenotype. RESULTS We found significant increases in VE with both pollutants and lags; for the estimated concentration averaged over the 3 days prior to the health assessment, we found increases in the odds of having VE with an OR of 1.52 (95% CI 1.19 to 1.94) for an IQR (0.30 μg/m(3)) increase in BC and an OR of 1.39 (95% CI 1.12 to 1.71) for an IQR (5.63 μg/m(3)) increase in PM2.5. We also found higher effects in subjects with the glutathione S-transferase theta-1 and glutathione S-transferase mu-1 variants and in obese (p<0.05). CONCLUSIONS Increased levels of short-term traffic-related pollutants may increase the risk of ventricular arrhythmia in elderly subjects.
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Affiliation(s)
- Antonella Zanobetti
- Environmental Epidemiology and Risk Program, Harvard School of Public Health, Boston, Massachusetts, USA
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28
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Yin F, Ramanathan G, Zhang M, Araujo JA. Prooxidative Effects of Ambient Pollutant Chemicals Are Inhibited by HDL. J Biochem Mol Toxicol 2013; 27:172-83. [DOI: 10.1002/jbt.21475] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2012] [Revised: 12/26/2012] [Accepted: 01/11/2013] [Indexed: 12/25/2022]
Affiliation(s)
- Fen Yin
- Department of Medicine, Division of Cardiology; David Geffen School of Medicine, University of California; Los Angeles, CA; 90095; USA
| | - Gajalakshmi Ramanathan
- Department of Medicine, Division of Cardiology; David Geffen School of Medicine, University of California; Los Angeles, CA; 90095; USA
| | - Min Zhang
- Department of Medicine, Division of Cardiology; David Geffen School of Medicine, University of California; Los Angeles, CA; 90095; USA
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29
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Miller MR, Shaw CA, Langrish JP. From particles to patients: oxidative stress and the cardiovascular effects of air pollution. Future Cardiol 2012; 8:577-602. [PMID: 22871197 DOI: 10.2217/fca.12.43] [Citation(s) in RCA: 167] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
Air pollution, especially airborne particulate matter (PM), is associated with an increase in both morbidity and mortality from cardiovascular disease, although the underlying mechanisms remain incompletely established. The one consistent observation that links the pulmonary and cardiovascular effects of inhaled PM is oxidative stress. This article examines the evidence for the role of oxidative stress in the cardiovascular effects of air pollution, beginning with observations from epidemiological and controlled exposure studies and then exploring potential mechanistic pathways involving free radical generation from PM itself, to effects of PM on cell cultures, isolated organs, healthy animals and animal models of disease. Particular emphasis is placed on the vascular and atherosclerotic effects of urban air pollution and diesel exhaust emissions as rich sources of environmental ultrafine particles.
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Affiliation(s)
- Mark R Miller
- BHF/University Centre for Cardiovascular Science, University of Edinburgh, Queens Medical Research Institute, 47 Little France Crescent, Edinburgh, Scotland, UK.
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30
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Dales RE, Cakmak S, Vidal CB, Rubio MA. Air pollution and hospitalization for acute complications of diabetes in Chile. ENVIRONMENT INTERNATIONAL 2012; 46:1-5. [PMID: 22647388 DOI: 10.1016/j.envint.2012.05.002] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2011] [Revised: 05/06/2012] [Accepted: 05/07/2012] [Indexed: 06/01/2023]
Abstract
Exposure to air pollution has been shown to cause insulin resistance in mice. To determine the relevance to humans, we tested the association between daily air pollution concentrations and daily hospitalization for acute serious complications of diabetes, coma and ketoacidosis, in Santiago between 2001 and 2008, using generalized linear models with natural splines to control for long term trends. For an interquartile range (IQR) increase in air pollutant, the relative risks (95% CI) of hospitalization for diabetes were: 1.15 (1.10, 1.20) for carbon monoxide (IQR=1.00); 1.07 (0.98, 1.16) for ozone (IQR=63.50); 1.14 (1.06, 1.22) for sulfur dioxide (IQR=5.88); 1.12(1.05, 1.20) for nitrogen dioxide (IQR=27.94); 1.11 (1.07, 1.15) for particulate matter≤10 μm diameter(IQR=34.00); and 1.11 (1.06, 1.16) for fine particulate matter ≤2.5 μm diameter (IQR=18.50). Results were similar when stratified by age, sex and season. Air pollution appears to increase the risk of acute complications of diabetes requiring hospitalization, suggesting that improvements in air quality may reduce morbidity from diabetes.
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Affiliation(s)
- Robert E Dales
- Health Canada, University of Ottawa Departments of Medicine and Epidemiology, The Ottawa Hospital (General Campus), 501 Smyth Road, Box 211, Ottawa, ON, K1H 8L6, Canada
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31
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Srivastava A, Yadav S, Sharma A, Dwivedi UN, Flora SJS, Parmar D. Similarities in diesel exhaust particles induced alterations in expression of cytochrome P-450 and glutathione S-transferases in rat lymphocytes and lungs. Xenobiotica 2012; 42:624-32. [PMID: 22352393 DOI: 10.3109/00498254.2011.650732] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Freshly prepared peripheral blood lymphocytes (PBL) are known to express cytochrome P450s (CYPs) and glutathione S-transferases (GSTs) involved in the bioactivation and detoxification of organic components of diesel exhaust particles (DEPs). To validate that blood lymphocyte expression profiles could be used as a biomarker to predict exposure to vehicular emissions, similarities in the alterations in the mRNA expression of CYPs and GSTs were studied in PBL and lungs of rats exposed to DEPs. Adult male Wistar rats were treated transtracheally with different doses of DEPs (3.75- or 7.5- or 15- or 30-mg/kg b.wt.). The animals were anaesthetized after 24 h and blood was drawn and lungs were taken out and processed. DEP produced a similar pattern of increase in the mRNA expression of CYPs (CYP1A1, 1A2, 1B1, 2E1), associated arylhydrocarbon receptor (Ahr) and arylhydrocarbon nuclear translocator (Arnt) and GSTs (GSTPi, GSTM1 and GSTM2) at all the doses in lungs and PBL. The protein expression of CYP1A1/1A2 and 2E1 and catalytic activity of CYPs and GSTs also showed a similar pattern of increase in blood lymphocyte and in lungs isolated from DEP treated rats. Our data indicating similarities in the alterations in the expression of carcinogen metabolizing CYPs and GSTs in PBL with the lung enzymes suggests the suitability of using expression profiles of blood lymphocyte CYPs and GSTs as a biomarker to predict exposure to vehicular emissions.
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Affiliation(s)
- Ankita Srivastava
- Developmental Toxicology Division, Indian Institute of Toxicology Research (Council of Scientific & Industrial Research), M.G. Marg, Lucknow, Uttar Pradesh, India
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Hosgood HD, Vermeulen R, Wei H, Reiss B, Coble J, Wei F, Jun X, Wu G, Rothman N, Lan Q. Combustion-derived nanoparticle exposure and household solid fuel use in Xuanwei and Fuyuan, China. INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH 2012; 22:571-81. [PMID: 22639822 PMCID: PMC4231791 DOI: 10.1080/09603123.2012.684147] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Combustion-derived nanoparticles (CDNPs) have not been readably measurable until recently. We conducted a pilot study to determine CDNP levels during solid fuel burning. The aggregate surface area of CDNP (μm(2)/cm(3)) was monitored continuously in 15 Chinese homes using varying fuel types (i.e. bituminous coal, anthracite coal, wood) and stove types (i.e. portable stoves, stoves with chimneys, firepits). Information on fuel burning activities was collected and PM(2.5) levels were measured. Substantial exposure differences were observed during solid fuel burning (mean: 228.1 μm(2)/cm(3)) compared to times without combustion (mean: 14.0 μm(2)/cm(3)). The observed levels during burning were reduced by about four-fold in homes with a chimney (mean: 92.1 μm(2)/cm(3); n = 9), and effects were present for all fuel types. Each home's CDNP measurement was only moderately correlated with the respective PM(2.5) measurements (r (2) = 0.43; p = 0.11). Our results indicate that household coal and wood burning contributes to indoor nanoparticle levels, which are not fully reflected in PM(2.5) measurements.
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Affiliation(s)
- H Dean Hosgood
- Division of Cancer Epidemiology and Genetics, National Cancer Institute, Bethesda, MD 20892, USA.
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Guxens M, Sunyer J. A review of epidemiological studies on neuropsychological effects of air pollution. Swiss Med Wkly 2012; 142:w13322. [DOI: 10.57187/smw.2012.13322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The aim of the present review is to provide an update of the epidemiological evidence of the effects of air pollution on neuropsychological development and impairment, as well as of the evidence on individual susceptibility to these effects. Animal studies have shown deposition of ultrafine particles containing metals in olfactory bulb and frontal cortical and subcortical areas, and overexpression of inflammatory responses, white matter lesions and vascular pathology in these areas that could be the basis for functional and structural brain effects. Several observational studies in the general population have observed cognitive deficits and behavioural impairment in children and the elderly. These effects, however, are not conclusive given the limited number of studies, their small size and their methodological constraints.
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Lodovici M, Bigagli E. Oxidative stress and air pollution exposure. J Toxicol 2011; 2011:487074. [PMID: 21860622 PMCID: PMC3155788 DOI: 10.1155/2011/487074] [Citation(s) in RCA: 392] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2010] [Revised: 05/10/2011] [Accepted: 06/30/2011] [Indexed: 12/11/2022] Open
Abstract
Air pollution is associated with increased cardiovascular and pulmonary morbidity and mortality. The mechanisms of air pollution-induced health effects involve oxidative stress and inflammation. As a matter of fact, particulate matter (PM), especially fine (PM(2.5), PM < 2.5 μm) and ultrafine (PM(0.1), PM < 0.1 μm) particles, ozone, nitrogen oxides, and transition metals, are potent oxidants or able to generate reactive oxygen species (ROS). Oxidative stress can trigger redox-sensitive pathways that lead to different biological processes such as inflammation and cell death. However, it does appear that the susceptibility of target organ to oxidative injury also depends upon its ability to upregulate protective scavenging systems. As vehicular traffic is known to importantly contribute to PM exposure, its intensity and quality must be strongly relevant determinants of the qualitative characteristics of PM spread in the atmosphere. Change in the composition of this PM is likely to modify its health impact.
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Affiliation(s)
- Maura Lodovici
- Department of Pharmacology and Toxicology, University of Florence, Viale Pieraccini 6, 50139 Florence, Italy
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35
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Bai N, Kido T, Kavanagh TJ, Kaufman JD, Rosenfeld ME, van Breemen C, van Eeden SF. Exposure to diesel exhaust up-regulates iNOS expression in ApoE knockout mice. Toxicol Appl Pharmacol 2011; 255:184-92. [PMID: 21722660 DOI: 10.1016/j.taap.2011.06.013] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2011] [Revised: 06/14/2011] [Accepted: 06/15/2011] [Indexed: 01/23/2023]
Abstract
UNLABELLED Traffic related particulate matter air pollution is a risk factor for cardiovascular events; however, the biological mechanisms are unclear. We hypothesize that diesel exhaust (DE) inhalation induces up-regulation of inducible nitric oxide synthase (iNOS), which is known to contribute to vascular dysfunction, progression of atherosclerosis and ultimately cardiovascular morbidity and mortality. METHODS ApoE knockout mice (30-week) were exposed to DE (at 200 μg/m³ of particulate matter) or filtered-air (control) for 7 weeks (6 h/day, 5 days/week). iNOS expression in the blood vessels and heart was evaluated by immunohistochemistry and western blotting analysis. To examine iNOS activity, thoracic aortae were mounted in a wire myograph, and vasoconstriction stimulated by phenylephrine (PE) was measured with and without the presence of the specific inhibitor for iNOS (1400 W). NF-κB (p65) activity was examined by ELISA. The mRNA expression of iNOS and NF-κB (p65) was determined by real-time PCR. RESULTS DE exposure significantly enhanced iNOS expression in the thoracic aorta (4-fold) and heart (1.5 fold). DE exposure significantly attenuated PE-stimulated vasoconstriction by ~20%, which was partly reversed by 1400 W. The mRNA expression of iNOS and NF-κB was significantly augmented after DE exposure. NF-κB activity was enhanced 2-fold after DE inhalation, and the augmented NF-κB activity was positively correlated with iNOS expression (R²=0.5998). CONCLUSIONS We show that exposure to DE increases iNOS expression and activity possibly via NF-κB-mediated pathway. We suspect that DE exposure-caused up-regulation of iNOS contributes to vascular dysfunction and atherogenesis, which could ultimately lead to urban air pollution-associated cardiovascular morbidity and mortality.
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Affiliation(s)
- Ni Bai
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia, Vancouver, BC, Canada
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36
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Oh SM, Kim HR, Park YJ, Lee SY, Chung KH. Organic extracts of urban air pollution particulate matter (PM2.5)-induced genotoxicity and oxidative stress in human lung bronchial epithelial cells (BEAS-2B cells). Mutat Res 2011; 723:142-51. [PMID: 21524716 DOI: 10.1016/j.mrgentox.2011.04.003] [Citation(s) in RCA: 125] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2010] [Revised: 02/28/2011] [Accepted: 04/10/2011] [Indexed: 10/18/2022]
Abstract
Traffic is a major source of particulate matter (PM), and ultrafine particulates and traffic intensity probably contribute significantly to PM-related health effects. As a strong relationship between air pollution and motor vehicle-originated pollutants has been shown to exist, air pollution genotoxicity studies of urban cities are steadily increasing. In Korea, the death rate caused by lung cancer is the most rapidly increased cancer death rate in the past 10 years. In this study, genotoxicity of PM2.5 (<2.5μm in aerodynamic diameter particles) collected from the traffic area in Suwon City, Korea, was studied using cultured human lung bronchial epithelial cells (BEAS-2B) as a model system for the potential inhalation health effects. Organic extract of PM2.5 (CE) generated significant DNA breakage and micronucleus formation in a dose-dependent manner (1μg/cm(3)-50μg/cm(3)). In the acid-base-neutral fractionation of PM2.5, neutral samples including the aliphatic (F3), aromatic (F4) and slightly polar (F5) fractions generated significant DNA breakage and micronucleus formation. These genotoxic effects were significantly blocked by scavenging agents [superoxide dismutase (SOD), sodium selenite (SS), mannitol (M), catalase (CAT)]. In addition, in the modified Comet assay using endonucleases (FPG and ENDOIII), CE and its fractions (F3, F4, and F5) increased DNA breakage compared with control groups, indicating that CE and fractions of PM2.5 induced oxidative DNA damage. These results clearly suggest that PM2.5 collected in the Suwon traffic area has genotoxic effects and that reactive oxygen species may play a distinct role in these effects. In addition, aliphatic/chlorinated hydrocarbons, PAH/alkylderivatives, and nitro-PAH/ketones/quinones may be important causative agents of the genotoxic effects.
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Affiliation(s)
- Seung Min Oh
- Hoseo Toxicological Research Center, Hoseo University, 165, Sechul-ri, Baebang-myun, Asan, Chungnam, 336-795, Republic of Korea
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Bai N, Kido T, Suzuki H, Yang G, Kavanagh TJ, Kaufman JD, Rosenfeld ME, van Breemen C, Eeden SFV. Changes in atherosclerotic plaques induced by inhalation of diesel exhaust. Atherosclerosis 2011; 216:299-306. [PMID: 21435644 DOI: 10.1016/j.atherosclerosis.2011.02.019] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/26/2010] [Revised: 02/05/2011] [Accepted: 02/09/2011] [Indexed: 12/19/2022]
Abstract
OBJECTIVE Exposure to particulate matter air pollution may be an independent risk factor for cardiovascular morbidity and mortality; however, the biological mechanisms are unclear. We hypothesize that exposure to diesel exhaust (DE), an important source of traffic-related particulate air pollution, promotes changes of atherosclerotic plaque component that may lead to plaque vulnerability. METHODS AND RESULTS 30-week old ApoE knockout mice fed with regular chow inhaled DE (at 200 μg/m(3) of particulate) or filtered-air (control) for 7 weeks (6 h/day, 5 days/week) (12 mice/group). Total number of alveolar macrophages (p<0.01) and alveolar macrophages positive for particles (p<0.0001) were more than 8-fold higher after DE inhalation than the control. DE inhalation caused 1.5 to 3-fold increases in plaque lipid content (p<0.02), cellularity (p<0.02), foam cell formation (p<0.04), and smooth muscle cell content (p<0.05). The expression of oxidative stress markers, iNOS, CD36, and nitrotyrosine was significantly increased by 1.5 to 2-fold in plaques, with enhanced systemic lipid and DNA oxidation (p<0.02). Increased foam cells and the expression of iNOS (R(2)=0.72, p=0.0081) and CD36 (R(2)=0.49, p=0.015) in plaques were positively correlated with the magnitude of DE exposure. CONCLUSIONS Exposure to DE promotes changes in atherosclerotic plaques characteristic of unstable vulnerable plaques. Increased systemic and plaque oxidative stress markers suggest that these changes in plaques could be due to DE-induced oxidative stress.
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Affiliation(s)
- Ni Bai
- Department of Anesthesiology, Pharmacology & Therapeutics, University of British Columbia, Vancouver, BC, Canada
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Delfino RJ, Staimer N, Vaziri ND. Air pollution and circulating biomarkers of oxidative stress. AIR QUALITY, ATMOSPHERE, & HEALTH 2011; 4:37-52. [PMID: 23626660 PMCID: PMC3634798 DOI: 10.1007/s11869-010-0095-2] [Citation(s) in RCA: 104] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Chemical components of air pollutant exposures that induce oxidative stress and subsequent inflammation may be partly responsible for associations of cardiovascular morbidity and mortality with airborne particulate matter and combustion-related pollutant gasses. However, epidemiologic evidence regarding this is limited. An exposure-assessment approach is to measure the oxidative potential of particle mixtures because it is likely that hundreds of correlated chemicals are involved in overall effects of air pollution on health. Oxidative potential likely depends on particle composition and size distribution, especially ultrafine particle concentration, and on transition metals and certain semivolatile and volatile organic chemicals. For health effects, measuring systemic oxidative stress in the blood is one feasible approach, but there is no universal biomarker of oxidative stress and there are many potential target molecules (lipids, proteins, DNA, nitric oxide, etc.), which may be more or less suitable for specific study goals. Concurrent with the measurement of oxidative stress, it is important to measure gene and/or protein expression of endogenous antioxidant enzymes because they can modify relations between oxidative stress biomarkers and air pollutants. Conversely, the expression and activities of these enzymes are modified by oxidative stress. This interplay will likely determine the observed effects of air pollutants on systemic inflammatory and thrombotic mediators and related clinical outcomes. Studies are needed to assess the reliability and validity of oxidative stress biomarkers, evaluate differences in associations between oxidative stress biomarkers and various pollutant measurements (mass, chemical components, and oxidative potential), and evaluate impacts of antioxidant responses on these relations.
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Affiliation(s)
- Ralph J. Delfino
- Department of Epidemiology, School of Medicine, University of California, Irvine, 100 Theory, Suite 100, Irvine, CA 92617-7555, USA
| | - Norbert Staimer
- Department of Epidemiology, School of Medicine, University of California, Irvine, 100 Theory, Suite 100, Irvine, CA 92617-7555, USA
| | - Nosratola D. Vaziri
- Nephrology and Hypertension Division, Department of Medicine, School of Medicine, University of California, Irvine, Irvine, CA, USA
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Wagner S, Bloh J, Kasper C, Bahnemann D. Toxicological Issues of Nanoparticles Employed in Photocatalysis. ACTA ACUST UNITED AC 2011. [DOI: 10.1515/green.2011.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
AbstractA huge amount of different nanomaterials is nowadays on the market used for various specific applications. Some nanomaterials such as TiOHence these materials are used for many applications, e.g., for self-cleaning and antibacterial coatings on different surfaces and for the purification of wastewater where the cleaning can be induced by simple exposure to sunlight. Because of the frequent use of these nanoparticles it is important to investigate the life cycles of these nanostructured materials as well as their environmental impact and their toxicity to animals and humans.This review first gives a short overview about nanotechnology and nanotechnological products as well as about photocatalysis and semiconductors used in this field. We then discuss the need for a new technology named nanotoxicology and the problems occurring when investigating the toxic potential of nanomaterials as well as the life cycle of nanomaterials. Furthermore, we focus on the environmental impact of TiO
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Araujo JA. Particulate air pollution, systemic oxidative stress, inflammation, and atherosclerosis. AIR QUALITY, ATMOSPHERE, & HEALTH 2010; 4:79-93. [PMID: 21461032 PMCID: PMC3040314 DOI: 10.1007/s11869-010-0101-8] [Citation(s) in RCA: 149] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2010] [Accepted: 10/06/2010] [Indexed: 05/18/2023]
Abstract
Air pollution has been associated with significant adverse health effects leading to increased overall morbidity and mortality of worldwide significance. Epidemiological studies have shown that the largest portion of air pollution-related mortality is due to cardiovascular diseases, predominantly those of ischemic nature. Human studies suggest an association with atherosclerosis and increasing experimental animal data support that this association is likely to be causal. While both gasses and particles have been linked to detrimental health effects, more evidence implicates the particulate matter (PM) components as major responsible for a large portion of the proatherogenic effects. Multiple experimental approaches have revealed the ability of PM components to trigger and/or enhance free radical reactions in cells and tissues, both ex vivo as well as in vivo. It appears that exposure to PM leads to the development of systemic prooxidant and proinflammatory effects that may be of great importance in the development of atherosclerotic lesions. This article reviews the epidemiological studies, experimental animal, and cellular data that support the association of air pollutants, especially the particulate components, with systemic oxidative stress, inflammation, and atherosclerosis. It also reviews the use of transcriptomic studies to elucidate molecular pathways of importance in those systemic effects.
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Affiliation(s)
- Jesus A. Araujo
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095 USA
- UCLA Division of Cardiology, 10833 Le Conte Avenue, CHS 43-264, Los Angeles, CA 90095 USA
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Cakmak S, Dales RE, Vidal CB. Air pollution and hospitalization for epilepsy in Chile. ENVIRONMENT INTERNATIONAL 2010; 36:501-5. [PMID: 20452673 DOI: 10.1016/j.envint.2010.03.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/18/2009] [Revised: 03/23/2010] [Accepted: 03/25/2010] [Indexed: 05/03/2023]
Abstract
OBJECTIVE To determine the association between gaseous and fine particulate air pollution (PM(2.5)) and epilepsy in a general population sample. METHOD A daily time-series analyses tested the association between daily hospitalization for epilepsy in seven Chilean urban centers during the period 2001 and 2005. Results were adjusted for long term trends, day-of-the-week, and average humidex on the day of hospitalization and the day before. RESULTS Pooled city estimates of relative risk (95% CI) of hospitalization for epilepsy associated with changes in pollutant concentrations equivalent to their interquartile range were: 1.098(1.045, 1.155) for carbon monoxide (CO); 1.100 (1.025, 1.181) for ozone O(3); 1.085 (1.03, 1.144) for sulfur dioxide (SO(2)); 1.108 (1.021, 1.204) for nitrogen dioxide (NO(2)); 1.083(1.038, 1.13) for particulate matter <or= 10 microm diameter (PM(10)); and 1.065(1.002, 1.132) for fine particulate matter <or=2.5 microm diameter (PM(2.5)). These results were not significantly influenced by age, sex, or season. INTERPRETATION Air pollution may be a risk factor for hospitalization for epilepsy.
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Affiliation(s)
- Sabit Cakmak
- Health Canada, Ottawa, Canada, Department of Statistics, Ottawa Health Research Institute, Ottawa, ON, Canada.
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Inoue KI, Takano H, Oda T, Yanagisawa R, Tamura H, Adachi Y, Ishibashi KI, Ohno N. Soluble cell wall beta-glucan of Candida induces/enhances apoptosis and oxidative stress in murine lung. Immunopharmacol Immunotoxicol 2010; 31:140-5. [PMID: 19951074 DOI: 10.1080/08923970802534678] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
The bioactivity of cell wall component(s) of fungi has not been fully investigated, especially in vivo. We have successfully extracted a soluble cell wall beta-glucan from C. albicans (CSBG), and shown that pulmonary exposure to CSBG induces lung inflammation in mice. CSBG-induced lung inflammation was concomitant with the nuclear translocation of signal transducer and activator of transcription (STAT)6 and enhanced lung expression of various cytokines and chemokines. However, the effects of CSBG on the murine respiratory system and their mechanisms have not been fully investigated. In this study, we further explored the effects of pulmonary exposure to CSBG on lung pathophysiology in terms of the induction of apoptosis and enhancement of oxidative stress. ICR mice were intratracheally instilled with vehicle, CSBG, or structurally degraded products of CSBG by formic acid (DEG-CSBG), and 24 h later, the lungs were isolated and evaluated for apoptosis by the TUNEL assay and oxidative stress by immunohistochemistry of 8-hydroxy-2'-deoxyguanosine (8-OHdG), a proper marker of the oxidative DNA damage. In another experiment, the mice were sacrificed and lungs were isolated 4 h after the instillation with vehicle or CSBG for evaluation of transcriptional level of heme oxygenase (HO)-1, a stress responsive protein. Pulmonary exposure to CSBG significantly induced apoptosis and enhanced the formation of 8-OHdG in the lung parenchyma as compared to vehicle or DEG-CSBG exposure. CSBG significantly induced HO-1 in the lung. Taken together, CSBG induces/enhances apoptosis and oxidative stress in the lung in association with lung inflammation/injury.
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Affiliation(s)
- Ken-ichiro Inoue
- Environmental Health Sciences Division, National Institute for Environmental Studies, Tsukuba, Ibaraki, Japan.
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Araujo JA, Nel AE. Particulate matter and atherosclerosis: role of particle size, composition and oxidative stress. Part Fibre Toxicol 2009; 6:24. [PMID: 19761620 PMCID: PMC2761850 DOI: 10.1186/1743-8977-6-24] [Citation(s) in RCA: 255] [Impact Index Per Article: 17.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2009] [Accepted: 09/18/2009] [Indexed: 02/02/2023] Open
Abstract
Air Pollution has been associated with significant adverse health effects leading to increased morbidity and mortality. Cumulative epidemiological and experimental data have shown that exposure to air pollutants lead to increased cardiovascular ischemic events and enhanced atherosclerosis. It appears that these associations are much stronger with the air particulate matter (PM) component and that in urban areas, the smaller particles could be more pathogenic, as a result of their greater propensity to induce systemic prooxidant and proinflammatory effects. Much is still unknown about the toxicology of ambient particulates as well as the pathogenic mechanisms responsible for the induction of adverse cardiovascular health effects. It is expected that better understanding of these effects will have large implications and may lead to the formulation and implementation of new regulatory policies. Indeed, we have found that ultrafine particles (<0.18 mum) enhance early atherosclerosis, partly due to their high content in redox cycling chemicals and their ability to synergize with known proatherogenic mediators in the promotion of tissue oxidative stress. These changes take place in parallel with increased evidence of phase 2 enzymes expression, via the electrophile-sensitive transcription factor, p45-NFE2 related transcription factor 2 (Nrf2). Exposure to ultrafine particles also results in alterations of the plasma HDL anti-inflammatory function that could be indicative of systemic proatherogenic effects. This article reviews the epidemiological, clinical and experimental animal evidence that support the association of particulate matter with atherogenesis. It also discusses the possible pathogenic mechanisms involved, the physicochemical variables that may be of importance in the greater toxicity exhibited by a small particle size, interaction with genes and other proatherogenic factors as well as important elements to consider in the design of future mechanistic studies.Extensive epidemiological evidence supports the association of air pollution with adverse health effects 123. It is increasingly being recognized that such effects lead to enhanced morbidity and mortality, mostly due to exacerbation of cardiovascular diseases and predominantly those of ischemic character 4. Indeed, in addition to the classical risk factors such as serum lipids, smoking, hypertension, aging, gender, family history, physical inactivity and diet, recent data have implicated air pollution as an important additional risk factor for atherosclerosis. This has been the subject of extensive reviews 56 and a consensus statement from the American Heart Association 7. This article reviews the supporting epidemiological and animal data, possible pathogenic mechanisms and future perspectives.
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Affiliation(s)
- Jesus A Araujo
- Division of Cardiology, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
| | - Andre E Nel
- Division of Nanomedicine, Department of Medicine, David Geffen School of Medicine, University of California, Los Angeles, CA 90095, USA
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Morales E, Julvez J, Torrent M, de Cid R, Guxens M, Bustamante M, Künzli N, Sunyer J. Association of early-life exposure to household gas appliances and indoor nitrogen dioxide with cognition and attention behavior in preschoolers. Am J Epidemiol 2009; 169:1327-36. [PMID: 19395695 DOI: 10.1093/aje/kwp067] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
The authors investigated the association of early-life exposure to indoor air pollution with neuropsychological development in preschoolers and assessed whether this association differs by glutathione-S-transferase gene (GSTP1) polymorphisms. A prospective, population-based birth cohort was set up in Menorca, Spain, in 1997-1999 (n = 482). Children were assessed for cognitive functioning (McCarthy Scales of Children's Abilities) and attention-hyperactivity behaviors (Diagnostic and Statistical Manual of Mental Disorders, 4th Edition) at age 4 years. During the first 3 months of life, information about gas appliances at home and indoor nitrogen dioxide concentration was collected at each participant's home (n = 398, 83%). Genotyping was conducted for the GSTP1 coding variant Ile105Val. Use of gas appliances was inversely associated with cognitive outcomes (beta coefficient for general cognition = -5.10, 95% confidence interval (CI): -9.92, -0.28; odds ratio for inattention symptoms = 3.59, 95% CI: 1.14, 11.33), independent of social class and other confounders. Nitrogen dioxide concentrations were associated with cognitive function (a decrease of 0.27 point per 1 ppb, 95% CI: -0.48, -0.07) and inattention symptoms (odds ratio = 1.06, 95% CI: 1.01, 1.12). The deleterious effect of indoor pollution from gas appliances on neuropsychological outcomes was stronger in children with the GSTP1 Val-105 allele. Early-life exposure to air pollution from indoor gas appliances may be negatively associated with neuropsychological development through the first 4 years of life, particularly among genetically susceptible children.
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Affiliation(s)
- Eva Morales
- Center for Research in Environmental Epidemiology, Barcelona, Catalonia, Spain
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Zanobetti A, Schwartz J. The effect of fine and coarse particulate air pollution on mortality: a national analysis. ENVIRONMENTAL HEALTH PERSPECTIVES 2009; 117:898-903. [PMID: 19590680 PMCID: PMC2702403 DOI: 10.1289/ehp.0800108] [Citation(s) in RCA: 393] [Impact Index Per Article: 26.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/19/2008] [Accepted: 02/13/2009] [Indexed: 05/17/2023]
Abstract
BACKGROUND Although many studies have examined the effects of air pollution on mortality, data limitations have resulted in fewer studies of both particulate matter with an aerodynamic diameter of 2.5 and < 10 microm; PM coarse). We conducted a national, multicity time-series study of the acute effect of PM(2.5) and PM coarse on the increased risk of death for all causes, cardiovascular disease (CVD), myocardial infarction (MI), stroke, and respiratory mortality for the years 1999-2005. METHOD We applied a city- and season-specific Poisson regression in 112 U.S. cities to examine the association of mean (day of death and previous day) PM(2.5) and PM coarse with daily deaths. We combined the city-specific estimates using a random effects approach, in total, by season and by region. RESULTS We found a 0.98% increase [95% confidence interval (CI), 0.75-1.22] in total mortality, a 0.85% increase (95% CI, 0.46-1.24) in CVD, a 1.18% increase (95% CI, 0.48-1.89) in MI, a 1.78% increase (95% CI, 0.96-2.62) in stroke, and a 1.68% increase (95% CI, 1.04-2.33) in respiratory deaths for a 10-microg/m(3) increase in 2-day averaged PM(2.5). The effects were higher in spring. For PM coarse, we found significant but smaller increases for all causes analyzed. CONCLUSIONS We conclude that our analysis showed an increased risk of mortality for all and specific causes associated with PM(2.5), and the risks are higher than what was previously observed for PM(10). In addition, coarse particles are also associated with more deaths.
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Affiliation(s)
- Antonella Zanobetti
- Department of Environmental Health, Harvard School of Public Health, Boston, Massachusetts 02215, USA.
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Li R, Ning Z, Cui J, Khalsa B, Ai L, Takabe W, Beebe T, Majumdar R, Sioutas C, Hsiai T. Ultrafine particles from diesel engines induce vascular oxidative stress via JNK activation. Free Radic Biol Med 2009; 46:775-82. [PMID: 19154785 PMCID: PMC3205928 DOI: 10.1016/j.freeradbiomed.2008.11.025] [Citation(s) in RCA: 75] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/11/2008] [Revised: 11/17/2008] [Accepted: 11/28/2008] [Indexed: 12/21/2022]
Abstract
Exposure to particulate air pollution is linked to increased incidences of cardiovascular diseases. Ambient ultrafine particles (UFP) from diesel vehicle engines have been shown to be proatherogenic in ApoE knockout mice and may constitute a major cardiovascular risk in humans. We posited that circulating nano-sized particles from traffic pollution sources induce vascular oxidative stress via JNK activation in endothelial cells. Diesel UFP were collected from a 1998 Kenworth truck. Intracellular superoxide assay revealed that these UFP dose-dependently induced superoxide (O(2)(-)) production in human aortic endothelial cells (HAEC). Flow cytometry showed that UFP increased MitoSOX red intensity specific for mitochondrial superoxide. Protein carbonyl content was increased by UFP as an indication of vascular oxidative stress. UFP also up-regulated heme oxygenase-1 (HO-1) and tissue factor (TF) mRNA expression, and pretreatment with the antioxidant N-acetylcysteine significantly decreased their expression. Furthermore, UFP transiently activated JNK in HAEC. Treatment with the JNK inhibitor SP600125 and silencing of both JNK1 and JNK2 with siRNA inhibited UFP-stimulated O(2)(-) production and mRNA expression of HO-1 and TF. Our findings suggest that JNK activation plays an important role in UFP-induced oxidative stress and stress response gene expression.
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Affiliation(s)
- Rongsong Li
- Department of Biomedical Engineering and Division of Cardiovascular Medicine, University of Southern California, Los Angeles, CA 90089, USA
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Li J, Ghio AJ, Cho SH, Brinckerhoff CE, Simon SA, Liedtke W. Diesel exhaust particles activate the matrix-metalloproteinase-1 gene in human bronchial epithelia in a beta-arrestin-dependent manner via activation of RAS. ENVIRONMENTAL HEALTH PERSPECTIVES 2009; 117:400-9. [PMID: 19337515 PMCID: PMC2661910 DOI: 10.1289/ehp.0800311] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2008] [Accepted: 10/29/2008] [Indexed: 05/17/2023]
Abstract
BACKGROUND Diesel exhaust particles (DEPs) are globally relevant air pollutants that exert a detrimental human health impact. However, mechanisms of damage by DEP exposure to human respiratory health and human susceptibility factors are only partially known. Matrix metalloproteinase-1 (MMP-1) has been implied as an (etio)pathogenic factor in human lung and airway diseases such as emphysema, chronic obstructive pulmonary disease, chronic asthma, tuberculosis, and bronchial carcinoma and has been reported to be regulated by DEPs. OBJECTIVE We elucidated the molecular mechanisms of DEPs' up-regulation of MMP-1. METHODS/RESULTS Using permanent and primary human bronchial epithelial (HBE) cells at air-liquid interface, we show that DEPs activate the human MMP-1 gene via RAS and subsequent activation of RAF-MEK-ERK1/2 mitogen-activated protein kinase signaling, which can be scaffolded by beta-arrestins. Short interfering RNA mediated beta-arrestin1/2 knockout eliminated formation, subsequent nuclear trafficking of phosphorylated ERK1/2, and resulting MMP-1 transcriptional activation. Transcriptional regulation of the human MMP-1 promoter was strongly influenced by the presence of the -1607GG polymorphism, present in 60-80% of humans, which led to striking up-regulation of MMP-1 transcriptional activation. CONCLUSION Our results confirm up-regulation of MMP-1 in response to DEPs in HBE and provide new mechanistic insight into how these epithelia, the first line of protection against environmental insults, up-regulate MMP-1 in response to DEP inhalation. These mechanisms include a role for the human -1607GG polymorphism as a susceptibility factor for an accentuated response, which critically depends on the ability of beta-arrestin1/2 to generate scaffolding and nuclear trafficking of phosphorylated ERK1/2.
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Affiliation(s)
- Jinju Li
- Department of Neurobiology, Duke University, Durham, North Carolina, USA
| | - Andrew J. Ghio
- U.S. Environmental Protection Agency, University of North Carolina, Chapel Hill, North Carolina, USA
| | - Seung-Hyun Cho
- U.S. Environmental Protection Agency, Research Triangle Park, Research Triangle Park, North Carolina, USA
| | - Constance E. Brinckerhoff
- Departments of Medicine and Biochemistry, Norris Cotton Cancer Center, Dartmouth-Hitchcock Medical Center, Lebanon, New Hampshire, USA
| | - Sidney A. Simon
- Department of Neurobiology, Duke University, Durham, North Carolina, USA
- Center for Neuroengineering and
| | - Wolfgang Liedtke
- Department of Neurobiology, Duke University, Durham, North Carolina, USA
- Division of Neurology, Department of Medicine, Duke University, Durham, North Carolina, USA
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Mo Y, Wan R, Chien S, Tollerud DJ, Zhang Q. Activation of endothelial cells after exposure to ambient ultrafine particles: the role of NADPH oxidase. Toxicol Appl Pharmacol 2009; 236:183-93. [PMID: 19371610 DOI: 10.1016/j.taap.2009.01.017] [Citation(s) in RCA: 65] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2008] [Revised: 01/24/2009] [Accepted: 01/26/2009] [Indexed: 01/31/2023]
Abstract
Several studies have shown that ultrafine particles (UFPs) may pass from the lungs to the circulation because of their very small diameter, and induce lung oxidative stress with a resultant increase in lung epithelial permeability. The direct effects of UFPs on vascular endothelium remain unknown. We hypothesized that exposure to UFPs leads to endothelial cell O(2)(-) generation via NADPH oxidase and results in activation of endothelial cells. Our results showed that UFPs, at a non-toxic dose, induced reactive oxygen species (ROS) generation in mouse pulmonary microvascular endothelial cells (MPMVEC) that was inhibited by pre-treatment with the ROS scavengers or inhibitors, but not with the mitochondrial inhibitor, rotenone. UFP-induced ROS generation in MPMVEC was abolished by p67(phox) siRNA transfection and UFPs did not cause ROS generation in MPMVEC isolated from gp91(phox) knock-out mice. UFP-induced ROS generation in endothelial cells was also determined in vivo by using a perfused lung model with imaging. Moreover, Western blot and immunofluorescence staining results showed that MPMVEC treated with UFPs resulted in the translocation of cytosolic proteins of NADPH oxidase, p47(phox), p67(phox) and rac 1, to the plasma membrane. These results demonstrate that NADPH oxidase in the pulmonary endothelium is involved in ROS generation following exposure to UFPs. To investigate the activation of endothelial cells by UFP-induced oxidative stress, we determined the activation of the mitogen-activated protein kinases (MAPKs) in MPMVEC. Our results showed that exposure of MPMVEC to UFPs caused increased phosphorylation of p38 and ERK1/2 MAPKs that was blocked by pre-treatment with DPI or p67(phox) siRNA. Exposure of MPMVEC obtained from gp91(phox) knock-out mice to UFPs did not cause increased phosphorylation of p38 and ERK1/2 MAPKs. These findings confirm that UFPs can cause endothelial cells to generate ROS directly via activation of NADPH oxidase. UFP-induced ROS lead to activation of MAPKs through induced phosphorylation of p38 and ERK1/2 MAPKs that may further result in endothelial dysfunction through production of cytokines such as IL-6. Our results suggest that endothelial oxidative stress may be an important mechanism for PM-induced cardiovascular effects.
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Affiliation(s)
- Yiqun Mo
- Department of Environmental Health and Occupational Health Sciences, School of Public Health and Information Sciences, University of Louisville, 485 E. Gray Street, Louisville, KY 40209, USA
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Sheesley RJ, Schauer JJ, Garshick E, Laden F, Smith TJ, Blicharz AP, Deminter JT. Tracking personal exposure to particulate diesel exhaust in a diesel freight terminal using organic tracer analysis. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2009; 19:172-86. [PMID: 18322451 PMCID: PMC2628448 DOI: 10.1038/jes.2008.11] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Personal exposure to particle-phase molecular markers was measured at a trucking terminal in St Louis, MO, as part of a larger epidemiologic project aimed at assessing carbonaceous fine particulate matter (PM) exposure in this occupational setting. The integration of parallel personal exposure, ambient worksite area and ambient urban background (St Louis Supersite) measurements provided a unique opportunity to track the work-related exposure to carbonaceous fine PM in a freight terminal. The data were used to test the proposed personal exposure model in this occupational setting: To accurately assess the impact of PM emission sources, particularly motor vehicle exhaust, and organic elemental carbon (OCEC) analysis and nonpolar organic molecular marker analysis by thermal desorption-gas chromatography/mass spectrometry (TD-GCMS) were conducted on all of the PM samples. EC has been used as a tracer for diesel exhaust in urban areas, however, the emission profile for diesel exhaust is dependent upon the operating conditions of the vehicle and can vary considerably within a fleet. Hopanes, steranes, polycyclic aromatic hydrocarbons and alkanes were measured by TD-GCMS. Hopanes are source-specific organic molecular markers for lubricating oil present in motor vehicle exhaust. The concentrations of OC, EC and the organic tracers were averaged to obtain average profiles to assess differences in the personal, worksite area and urban background samples, and were also correlated individually by sample time to evaluate the exposure model presented above. Finally, a chemical mass balance model was used to apportion the motor vehicle and cigarette-smoke components of the measured OC and EC for the average personal exposure, worksite area and urban background samples.
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Affiliation(s)
- Rebecca J Sheesley
- Environmental Chemistry and Technology Program, University of Wisconsin, 660 N Park Street, Madison, WI 53706, USA
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Nadadur SS, Haykal-Coates N, Mudipalli A, Costa DL. Endothelial effects of emission source particles: acute toxic response gene expression profiles. Toxicol In Vitro 2008; 23:67-77. [PMID: 19000753 DOI: 10.1016/j.tiv.2008.10.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2008] [Revised: 09/22/2008] [Accepted: 10/14/2008] [Indexed: 11/16/2022]
Abstract
Air pollution epidemiology has established a strong association between exposure to ambient particulate matter (PM) and cardiovascular outcomes. Experimental studies in both humans and laboratory animals support varied biological mechanisms including endothelial dysfunction as potentially a central step to the elicitation of cardiovascular events. We therefore hypothesized that relevant early molecular alterations on endothelial cells should be assessable in vitro upon acute exposure to PM components previously shown to be involved in health outcomes. Using a model emission PM, residual oil fly ash and one of its predominant constituents (vanadium-V), we focused on the development of gene expression profiles to fingerprint that particle and its constituents to explore potential biomarkers for PM-induced endothelial dysfunction. Here we present differential gene expression and transcription factor activation profiles in human vascular endothelial cells exposed to a non-cytotoxic dose of fly ash or V following semi-global gene expression profiling of approximately 8000 genes. Both fly ash and it's prime constituent, V, induced alterations in genes involved in passive and active transport of solutes across the membrane; voltage-dependent ion pumps; induction of extracellular matrix proteins and adhesion molecules; and activation of numerous kinases involved in signal transduction pathways. These preliminary data suggest that cardiovascular effects associated with exposure to PM may be mediated by perturbations in endothelial cell permeability, membrane integrity; and ultimately endothelial dysfunction.
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Affiliation(s)
- Srikanth S Nadadur
- Pulmonary Toxicology Branch, Experimental Toxicology Division, National Health Environmental Effects Research Laboratory, ORD, US EPA, Research Triangle Park, NC 27711, USA.
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