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Marchini T. Redox and inflammatory mechanisms linking air pollution particulate matter with cardiometabolic derangements. Free Radic Biol Med 2023; 209:320-341. [PMID: 37852544 DOI: 10.1016/j.freeradbiomed.2023.10.396] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/04/2023] [Revised: 09/27/2023] [Accepted: 10/15/2023] [Indexed: 10/20/2023]
Abstract
Air pollution is the largest environmental risk factor for disease and premature death. Among the different components that are present in polluted air, fine particulate matter below 2.5 μm in diameter (PM2.5) has been identified as the main hazardous constituent. PM2.5 mainly arises from fossil fuel combustion during power generation, industrial processes, and transportation. Exposure to PM2.5 correlates with enhanced mortality risk from cardiovascular diseases (CVD), such as myocardial infarction and stroke. Over the last decade, it has been increasingly suggested that PM2.5 affects CVD already at the stage of risk factor development. Among the multiple biological mechanisms that have been described, the interplay between oxidative stress and inflammation has been consistently highlighted as one of the main drivers of pulmonary, systemic, and cardiovascular effects of PM2.5 exposure. In this context, PM2.5 uptake by tissue-resident immune cells in the lung promotes oxidative and inflammatory mediators release that alter tissue homeostasis at remote locations. This pathway is central for PM2.5 pathogenesis and might account for the accelerated development of risk factors for CVD, including obesity and diabetes. However, transmission and end-organ mechanisms that explain PM2.5-induced impaired function in metabolic active organs are not completely understood. In this review, the main features of PM2.5 physicochemical characteristics related to PM2.5 ability to induce oxidative stress and inflammation will be presented. Hallmark and recent epidemiological and interventional studies will be summarized and discussed in the context of current air quality guidelines and legislation, knowledge gaps, and inequities. Lastly, mechanistic studies at the intersection between redox metabolism, inflammation, and function will be discussed, with focus on heart and adipose tissue alterations. By offering an integrated analysis of PM2.5-induced effects on cardiometabolic derangements, this review aims to contribute to a better understanding of the pathogenesis and potential interventions of air pollution-related CVD.
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Affiliation(s)
- Timoteo Marchini
- Vascular Immunology Laboratory, Department of Cardiology and Angiology, University Heart Center Freiburg-Bad Krozingen, Faculty of Medicine, University of Freiburg, 79106, Freiburg, Germany; Universidad de Buenos Aires, CONICET, Instituto de Bioquímica y Medicina Molecular Prof. Alberto Boveris (IBIMOL), Facultad de Farmacia y Bioquímica, C1113AAD, Buenos Aires, Argentina.
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Peng R, Yang W, Shao W, Pan B, Zhu Y, Zhang Y, Kan H, Xu Y, Ying Z. Deficiency of interleukin-6 receptor ameliorates PM 2.5 exposure-induced pulmonary dysfunction and inflammation but not abnormalities in glucose homeostasis. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 247:114253. [PMID: 36343449 PMCID: PMC9759823 DOI: 10.1016/j.ecoenv.2022.114253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/07/2022] [Revised: 10/25/2022] [Accepted: 10/29/2022] [Indexed: 06/16/2023]
Abstract
BACKGROUND Ambient fine particulate matter (PM2.5) exposure increases local and systemic interleukin-6 (IL-6). However, the pathogenic role of IL-6 signalling following PM2.5 exposure, particularly in the development of pulmonary dysfunction and abnormal glucose homeostasis, has hardly been investigated. RESULTS In the study, IL-6 receptor (IL-6R)-deficient (IL-6R-/-) and wildtype littermate (IL-6R+/+) mice were exposed to concentrated ambient PM2.5 (CAP) or filtered air (FA), and their pulmonary and metabolic responses to these exposures were analyzed. Our results demonstrated that IL-6R deficiency markedly alleviated PM2.5 exposure-induced increases in lung inflammatory markers including the inflammation score of histological analysis, the number of macrophages in bronchoalveolar lavage fluid (BALF), and mRNA expressions of TNFα, IL-1β and IL-6 and abnormalities in lung function test. However, IL-6R deficiency did not reduce the hepatic insulin resistance nor systemic glucose intolerance and insulin resistance induced by PM2.5 exposure. CONCLUSION Our findings support the crucial role of IL-6 signalling in the development of pulmonary inflammation and dysfunction due to PM2.5 exposure but question the putative central role of pulmonary inflammation for the extra-pulmonary dysfunctions following PM2.5 exposure, providing a deep mechanistic insight into the pathogenesis caused by PM2.5 exposure.
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Affiliation(s)
- Renzhen Peng
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China
| | - Wenhui Yang
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China
| | - Wenpu Shao
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China
| | - Bin Pan
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China
| | - Yaning Zhu
- Department of Pathology, The Affiliated Huaian No.1 People's Hospital of Nanjing Medical University, Huaian, China
| | - Yubin Zhang
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China
| | - Haidong Kan
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China
| | - Yanyi Xu
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China.
| | - Zhekang Ying
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD, USA.
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Liang X, Liu F, Liang F, Ren Y, Tang X, Luo S, Huang D, Feng W. Association of decreases in PM2.5 levels due to the implementation of environmental protection policies with the incidence of obesity in adolescents: A prospective cohort study. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 247:114211. [PMID: 36306623 DOI: 10.1016/j.ecoenv.2022.114211] [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: 06/05/2022] [Revised: 10/16/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
AIMS To explore the association between decreased levels of particulate matter (≤2.5 µm; PM2.5) due to the implementation of environmental protection policies and the incidence of obesity in adolescents in Chongqing, China through a prospective cohort study. METHODS A total of 2105 children (52.02% male; aged 7.33 ± 0.60 years at baseline) were enrolled from the Chongqing Children's Health Cohort. A mixed linear regression model was used to analyse the relationships of PM2.5 levels with obesity indicators after adjusting for covariates. Additionally, a Poisson regression model was used to determine the relationship between PM2.5 exposure and the incidence of overweight/obesity. RESULTS The average PM2.5 exposure levels from participant conception to 2014, from 2015 to 2017, and from 2018 to 2019 were 66.64 ± 5.33 μg/m3, 55.49 ± 3.78 μg/m3, and 42.50 ± 1.87 μg/m3, respectively; these levels significantly decreased over time (P < 0.001). Throughout the entire follow-up period, the incidence of overweight/obesity after a ≥ 25 μg/m3 decrease in the PM2.5 level was 4.57% among females; this incidence was the lowest among females who experienced remarkable decreases in PM2.5 exposure. A 1-µg/m3 decrease in the PM2.5 level significantly decreased the body mass index (BMI), BMI z score (BMIz), and weight of adolescents (all P < 0.001). Compared with a < 20-μg/m3 decrease in the PM2.5 level, a ≥ 25-μg/m3 decrease protected against increased BMI (net difference= -0.93; 95% confidence interval [CI]: (-1.23,-0.63) kg/m2), BMIz (-0.28 (-0.39, -0.17)), weight (-1.59 (-2.44, -0.74) kg), and incidence of overweight/obesity (0.48 (0.37, 0.62), P < 0.001). Moreover, compared with a < 20-μg/m3 decrease in the PM2.5 level, a ≥ 25-μg/m3 decrease resulted in significant absolute differences in BMI (-1.26 (-1.56, -0.96) kg/m2), BMIz (-0.53 (-0.65, -0.40)) and weight (-3.01 (-3.8, -2.19) kg) (all P < 0.001). CONCLUSIONS This study showed the etiological relevance of declining PM2.5 concentrations for the incidence of obesity in children and adolescents, suggesting that controlling ambient air pollutants may prevent the development of obesity in this age group. Continuous implementation of environmental protection policies in China has led to substantial health benefits.
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Affiliation(s)
- Xiaohua Liang
- Department of Clinical Epidemiology and Biostatistics, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400016, China.
| | - Fangchao Liu
- Department of Epidemiology, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China
| | - Fengchao Liang
- School of Public Health and Emergency Management, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yanling Ren
- Department of Clinical Epidemiology and Biostatistics, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400016, China
| | - Xian Tang
- Department of Clinical Epidemiology and Biostatistics, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400016, China
| | - Shunqing Luo
- Department of Clinical Epidemiology and Biostatistics, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400016, China; Department of Epidemiology, Fuwai Hospital, National Center for Cardiovascular Diseases, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing 100037, China; School of Public Health and Emergency Management, Southern University of Science and Technology, Shenzhen 518055, China
| | - Daochao Huang
- Department of Clinical Epidemiology and Biostatistics, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400016, China
| | - Wei Feng
- Department of Clinical Epidemiology and Biostatistics, Children's Hospital of Chongqing Medical University, National Clinical Research Center for Child Health and Disorders, Ministry of Education Key Laboratory of Child Development and Disorders, Chongqing Key Laboratory of Pediatrics, Chongqing 400016, China
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Bai J, Wang H, Yang S, Lu J, Li C, Sun Y, Huo T, Deng J, Zhang Q. Dust fall PM 2.5-induced lung inflammation in rats is associated with hypermethylation of the IFN-γ gene promoter via the PI3K-Akt-DNMT3b pathway. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2022; 95:103942. [PMID: 35933082 DOI: 10.1016/j.etap.2022.103942] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Revised: 06/30/2022] [Accepted: 08/02/2022] [Indexed: 06/15/2023]
Abstract
Inflammation is one of the major adverse effects of fine particulate matter (PM2.5) on the lung system; however, its mechanisms remain unclear. Rats were exposed to different concentrations of PM2.5 to investigate the mechanism of short-term exposure-induced lung inflammation. The regulation of PI3K-Akt and DNA methyltransferase 3b (DNMT3b) was assessed by using a PI3K inhibitor and a DNA methyltransferase inhibitor. We found that PM2.5 could decrease interferon-γ (IFN-γ) levels and increase interleukin 4 (IL-4), IL-5 and IL-13 levels in bronchoalveolar lavage fluid (BALF) to promote eosinophil infiltration and eventually lead to allergic pulmonary inflammation. Moreover, the CpG island methylation rate of the IFN-γ promoter and the protein expression of DNMT3b, PI3K and p-Akt were increased in lung tissues after PM2.5 exposure. Both inhibitors reversed the CpG island hypermethylation of IFN-γ. In conclusion, in PM2.5-induced lung injury, the activated PI3K-Akt pathway, via an increase in DNMT3b expression, is involved in CpG hypermethylation of the IFN-γ gene promoter.
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Affiliation(s)
- Jun Bai
- School of Public Health, Southwest Medical University, Luzhou 646000, China
| | - Hailan Wang
- School of Public Health, Southwest Medical University, Luzhou 646000, China
| | - Siyu Yang
- School of Public Health, Southwest Medical University, Luzhou 646000, China
| | - Ji Lu
- School of Pharmacy, Southwest Medical University, Luzhou 646000, China
| | - Chenwen Li
- School of Public Health, Southwest Medical University, Luzhou 646000, China
| | - Yaochuan Sun
- State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing University, Chongqing 400044, China
| | - Tingting Huo
- School of Environmental and Resource, Southwest University of Science and Technology, Mianyang 621010, China
| | - Jianjun Deng
- Department of Clinical Laboratory, 404 Hospital of Mianyang, Mianyang 621000, China.
| | - Qingbi Zhang
- School of Public Health, Southwest Medical University, Luzhou 646000, China.
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Xu Y, Li Z, Liu Y, Pan B, Peng R, Shao W, Yang W, Chen M, Kan H, Ying Z, Zhang Y. Differential Roles of Water-Insoluble and Water-Soluble Fractions of Diesel Exhaust Particles in the Development of Adverse Health Effects Due to Chronic Instillation of Diesel Exhaust Particles. Chem Res Toxicol 2021; 34:2450-2459. [PMID: 34780166 DOI: 10.1021/acs.chemrestox.1c00199] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Ambient fine particulate matter (PM2.5) has a marked temporospatial variation in chemical composition, but how the composition of PM2.5 influences its toxicity remains elusive. To explore the roles of individual PM2.5 components in the pathogenesis following PM2.5 exposure, we prepared water-soluble (WS-DEP) and water-insoluble (WIS-DEP) fractions of diesel exhaust particles (DEP) and performed 15-week intratracheal instillation on C57Bl/6J mice using these fractions. Their effects on pulmonary and systemic inflammation, hepatic steatosis and insulin resistance, systemic glucose homeostasis, and gut microbiota were then assessed. Compared to control, instillation of DEP or WIS-DEP, but not WS-DEP, significantly increased pulmonary inflammatory scores and expression of inflammatory markers, bronchoalveolar lavage fluid cell number, and circulating pro-inflammatory cytokines. Consistently, DEP- or WIS-DEP-instilled but not WS-DEP-instilled mice versus control had significant hepatic steatosis and insulin resistance and systemic glucose intolerance. In contrast, instillation of WS-DEP versus instillation of WIS-DEP had effects on the gut microbiota more comparable to that of instillations of DEP. The pulmonary and systemic inflammation, hepatic steatosis and insulin resistance, and systemic glucose intolerance following chronic DEP instillation are all attributable to the WIS-DEP, suggesting that PM2.5 may have a solubility-dependent basal toxicity.
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Affiliation(s)
- Yanyi Xu
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China
| | - Zhouzhou Li
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China
| | - Ying Liu
- National Clinical Research Center for Interventional Medicine, Shanghai 200032, China
| | - Bin Pan
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China
| | - Renzheng Peng
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China
| | - Wenpu Shao
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China
| | - Wenhui Yang
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China
| | - Minjie Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21202, United States
| | - Haidong Kan
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China
| | - Zhekang Ying
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21202, United States
| | - Yuhao Zhang
- National Clinical Research Center for Interventional Medicine, Shanghai 200032, China.,Department of Neurology, Zhongshan Hospital, Fudan University, Shanghai 200032, China
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Qiu L, Chen M, Wang X, Chen S, Ying Z. PM2.5 Exposure of Mice during Spermatogenesis: A Role of Inhibitor κB Kinase 2 in Pro-Opiomelanocortin Neurons. ENVIRONMENTAL HEALTH PERSPECTIVES 2021; 129:97006. [PMID: 34495743 PMCID: PMC8425520 DOI: 10.1289/ehp8868] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 08/09/2021] [Accepted: 08/19/2021] [Indexed: 06/13/2023]
Abstract
BACKGROUND Epidemiological studies have shown that exposure to ambient fine particulate matter with aerodynamic diameter less than or equal to 2.5 μm (PM2.5) correlates with a decrease in sperm count, but the biological mechanism remains elusive. OBJECTIVES This study tested whether hypothalamic inflammation, an emerging pathophysiological mediator, mediates the development of lower epididymal sperm count due to PM2.5 exposure. METHODS Inhibitor κB kinase 2 (IKK2) was conditionally knocked out either in all neurons or subtypes of hypothalamic neurons of mice. Effects of concentrated ambient PM2.5 (CAP) exposure on hypothalamic inflammation, the hypothalamic-pituitary-gonadal (HPG) axis, and epididymal sperm count of these mouse models were then assessed. Furthermore, to test whether hypothalamic inflammation is sufficient to decrease sperm production, we overexpressed constitutively active IKK2 (IKK2ca) either in all neurons or subtypes of hypothalamic neurons and assessed hypothalamic inflammation, the HPG axis, and sperm production of these overexpression mouse models. RESULTS CAP-exposed wild-type control mice vs. filtered air (FA)-exposed wild-type control mice had a higher expression of hypothalamic inflammatory markers, lower functional indexes of the HPG axis, and a lower epididymal sperm count. In contrast, all these measurements for CAP- vs. FA-exposed mice deficient of IKK2 in all neurons were comparable. We also found that overexpression of IKK2ca in either all neurons or pro-opiomelanocortin (POMC) neurons only, but not in Agouti-related protein (AgRP) neurons only, resulted in lower functional indexes of the HPG axis and a lower epididymal sperm count. Moreover, we showed that CAP- vs. FA-exposed mice deficient of IKK2 in POMC neurons had a comparable expression of hypothalamic inflammatory markers, comparable functional indexes of the HPG axis, and a comparable epididymal sperm count. DISCUSSION This mouse model study shows a causal role of IKK2 of POMC neurons in the development of lower epididymal sperm count due to PM2.5 exposure, providing a mechanistic insight into this emerging pathogenesis. https://doi.org/10.1289/EHP8868.
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Affiliation(s)
- Lianglin Qiu
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
- School of Public Health, Nantong University, Nantong, Jiangsu, China
| | - Minjie Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Xiaoke Wang
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
- School of Public Health, Nantong University, Nantong, Jiangsu, China
| | - Sufang Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
- The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan, China
| | - Zhekang Ying
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
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Tao S, Xu Y, Chen M, Zhang H, Huang X, Li Z, Pan B, Peng R, Zhu Y, Kan H, Li W, Ying Z. Exposure to different fractions of diesel exhaust PM 2.5 induces different levels of pulmonary inflammation and acute phase response. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 210:111871. [PMID: 33422840 DOI: 10.1016/j.ecoenv.2020.111871] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2020] [Revised: 12/22/2020] [Accepted: 12/24/2020] [Indexed: 06/12/2023]
Abstract
AIM Ambient fine particulate matter (PM2.5) consists of various components, and their respective contributions to the toxicity of PM2.5 remains to be determined. To provide specific recommendations for preventing adverse effects due to PM2.5 pollution, we determined whether the induction of pulmonary inflammation, the putative pathogenesis for the morbidity and mortality due to PM2.5 exposure, was fractioned through solubility-dependent fractioning. METHODS In the present study, the water and heptane solubilities-dependent serial fractioning of diesel exhaust particulate matter (DEP), a prominent source of urban PM2.5 pollution, was performed. The pro-inflammatory actions of these resultant fractions were then determined using both an intratracheal instillation mouse model and cultured BEAS-2B cells, a human bronchial epithelial cell line. RESULTS Instillation of the water-insoluble, but not -soluble fraction elicited significant pulmonary inflammatory and acute phase responses, comparable to those induced by instillation of DEP. The water-insoluble fraction was further fractioned using heptane, a polar organic solvent, and instillation of heptane-insoluble, but not -soluble fraction elicited significant pulmonary inflammation and acute phase responses. Furthermore, we showed that DEP and water-insoluble DEP, but not water-soluble DEP, activated pro-inflammatory signaling in cultured BEAS-2B cells, ruling out the possibility that the solubility impacts the in vivo distribution and thus the pulmonary inflammatory response.
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Affiliation(s)
- Shimin Tao
- NHC Key Lab of Reproduction Regulation (Shanghai Institute of Planned Parenthood Research), School of Pharmacy, Fudan University, Shanghai 200032, China.
| | - Yanyi Xu
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China.
| | - Minjie Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
| | - Haichang Zhang
- Key Laboratory of Rubber-Plastics of Ministry of Education/Shandong Province (QUST), School of Polymer Science & Engineering, Qingdao University of Science & Technology, Qingdao 266042, China.
| | - Xingke Huang
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China.
| | - Zhouzhou Li
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China.
| | - Bin Pan
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China.
| | - Renzhen Peng
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China.
| | - Yaning Zhu
- Department of Pathology, The Affiliated Huaian No.1 People's Hospital of Nanjing Medical University, Huaian, China.
| | - Haidong Kan
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai 200032, China.
| | - Weihua Li
- NHC Key Lab of Reproduction Regulation (Shanghai Institute of Planned Parenthood Research), School of Pharmacy, Fudan University, Shanghai 200032, China.
| | - Zhekang Ying
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
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Pan B, Chen M, Zhang X, Liang S, Qin X, Qiu L, Cao Q, Peng R, Tao S, Li Z, Zhu Y, Kan H, Xu Y, Ying Z. Hypothalamic-pituitary-adrenal axis mediates ambient PM 2.5 exposure-induced pulmonary inflammation. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 208:111464. [PMID: 33075589 PMCID: PMC7775869 DOI: 10.1016/j.ecoenv.2020.111464] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 09/08/2020] [Accepted: 10/03/2020] [Indexed: 05/06/2023]
Abstract
Ambient fine particulate matter (PM2.5) exposure correlates with adverse cardiometabolic effects. The underlying mechanisms have not yet been fully understood. Hypothalamic-pituitary-adrenal (HPA) axis, as the central stress response system, regulates cardiometabolic homeostasis and is implicated in the progression of various adverse health effects caused by inhalational airborne pollutant exposure. In this study, we investigated whether ambient PM2.5 exposure activates HPA axis and its effect mediating PM2.5-induced pulmonary inflammation. C57Bl/6 J mice were intratracheally instilled with different concentrations of diesel exhaust PM2.5 (DEP), and plasma was harvested at different times. Assessments of plasma stress hormones revealed that DEP instillation dose- and time-dependently increased mouse circulating corticosterone and adrenocorticotropic hormone (ACTH) levels, strongly supporting that DEP instillation activates HPA axis. To determine which components of DEP activate HPA axis, C57Bl/6J mice were intratracheally instilled with water-soluble and -insoluble fractions of DEP. Plasma analyses showed that water-insoluble but not -soluble fraction of DEP increased circulating corticosterone and ACTH levels. Consistently, concentrated ambient PM2.5 (CAP) exposure significantly increased mouse urine and hair corticosterone levels, corroborating the activation of HPA axis by ambient PM2.5. Furthermore, deletion of stress hormones by total bilateral adrenalectomy alleviated PM2.5-induced pulmonary inflammation, providing insights into the contribution of central neurohormonal mechanisms in modulating adverse health effects caused by exposure to PM2.5.
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Affiliation(s)
- Bin Pan
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China.
| | - Minjie Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA.
| | - Xuan Zhang
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA.
| | - Shuai Liang
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA.
| | - Xiaobo Qin
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA.
| | - Lianglin Qiu
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA.
| | - Qi Cao
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA.
| | - Renzhen Peng
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China.
| | - Shimin Tao
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China.
| | - Zhouzhou Li
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China.
| | - Yaning Zhu
- Department of Pathology, The Affiliated Huaian No.1 People's Hospital of Nanjing Medical University, Huaian, China.
| | - Haidong Kan
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China.
| | - Yanyi Xu
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, China; Shanghai Typhoon Institute/CMA, Shanghai Key Laboratory of Meteorology and Health, Shanghai, China.
| | - Zhekang Ying
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA.
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Wei W, Tang L, Chen M, Chen S, Zhou H, Ying Z. Intermittent fasting ameliorates PM 2.5 exposure-induced abnormalities in glycaemic control. Toxicol Appl Pharmacol 2020; 404:115181. [PMID: 32758488 DOI: 10.1016/j.taap.2020.115181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2020] [Revised: 07/28/2020] [Accepted: 07/29/2020] [Indexed: 11/25/2022]
Abstract
Exposure to ambient fine particulate matter (PM2.5) elicits various abnormalities in glycaemic control and thus correlates with type 2 diabetes. Intermittent fasting is an emerging treatment for type 2 diabetes. This study, therefore, tested whether intermittent fasting ameliorates PM2.5 exposure-induced abnormalities in glycaemic control. To this end, C57Bl/6 J mice were exposed to filtered air (FA) or concentrated ambient PM2.5 (CAP) for 16 weeks and concurrently subject to ad libitum feeding or intermittent fasting. The food intake assessment showed that CAP exposure transiently reduced food intake in ad libitum fed mice, but persistently reduced food intake in intermittently fasted mice. In contrast, CAP exposure persistently promoted mouse weight gain in ad libitum fed mice, while intermittent fasting blocked this CAP exposure-induced weight gain. The glucose homeostasis assessments revealed that CAP exposure elicited insulin resistance and glucose intolerance and meanwhile increased glucose-induced insulin secretion (GIIS). The insulin resistance and glucose intolerance, but not the increase in GIIS, induced by CAP exposure were blocked by intermittent fasting. Analysis of Akt phosphorylation, the indicator of local insulin signaling, showed that CAP exposure reduced insulin signaling in the liver and adipose tissues but not in the skeletal muscle. Intermittent fasting blocked CAP exposure-induced insulin resistance in the liver but not in the adipose tissues. The present study demonstrates that intermittent fasting ameliorates PM2.5 exposure-induced insulin resistance and glucose intolerance, strongly supporting that it may be used to prevent type 2 diabetes due to exposure to PM2.5.
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Affiliation(s)
- Wei Wei
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Bile Pancreatic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Ling Tang
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Bile Pancreatic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Minjie Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD 21201, USA
| | - Sufang Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Endocrinology, the People's Hospital of Zhengzhou University (Henan Provincial People's Hospital), Zhengzhou, Henan 450003, China
| | - Huifen Zhou
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD 21201, USA; Department of Pathology, Hubei University of Science and Technology, Xianning, Hubei 437100, China
| | - Zhekang Ying
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD 21201, USA.
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Short-term exposure to air pollution (PM 2.5) induces hypothalamic inflammation, and long-term leads to leptin resistance and obesity via Tlr4/Ikbke in mice. Sci Rep 2020; 10:10160. [PMID: 32576879 PMCID: PMC7311527 DOI: 10.1038/s41598-020-67040-3] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Accepted: 05/18/2020] [Indexed: 12/21/2022] Open
Abstract
A previous study demonstrated that a high-fat diet (HFD), administered for one-three-days, induces hypothalamic inflammation before obesity’s established, and the long term affects leptin signaling/action due to inflammation. We investigate whether exposure to particulate matter of a diameter of ≤2.5 μm (PM2.5) in mice fed with a chow diet leads to similar metabolic effects caused by high-fat feeding. Compared to the filtered air group (FA), one-day-exposure-PM2.5 did not affect adiposity. However, five-days-exposure-PM2.5 increased hypothalamic microglia density, toll-like-receptor-4 (Tlr4), and the inhibitor-NF-kappa-B-kinase-epsilon (Ikbke) expression. Concurrently, fat mass, food intake (FI), and ucp1 expression in brown adipose tissue were also increased. Besides, decreased hypothalamic STAT3-phosphorylation and Pomc expression were found after twelve-weeks-exposure-PM2.5. These were accompanied by increased FI and lower energy expenditure (EE), leading to obesity, along with increased leptin and insulin levels and HOMA. Mechanistically, the deletion of Tlr4 or knockdown of the Ikbke gene in the hypothalamus was sufficient to reverse the metabolic outcomes of twelve-weeks-exposure-PM2.5. These data demonstrated that short-term exposure-PM2.5 increases hypothalamic inflammation, similar to a HFD. Long-term exposure-PM2.5 is even worse, leading to leptin resistance, hyperphagia, and decreased EE. These effects are most likely due to chronic hypothalamic inflammation, which is regulated by Tlr4 and Ikbke signaling.
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Du X, Zeng X, Pan K, Zhang J, Song L, Zhou J, Chen R, Xie Y, Sun Q, Zhao J, Kan H. Metabolomics analysis of urine from healthy wild type mice exposed to ambient PM 2.5. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 714:136790. [PMID: 31982767 DOI: 10.1016/j.scitotenv.2020.136790] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2019] [Revised: 01/12/2020] [Accepted: 01/17/2020] [Indexed: 06/10/2023]
Abstract
BACKGROUND Ambient fine particulate matter (PM2.5) exposure has been linked with various adverse health outcomes. However, the urine metabolomics changes impacted by PM2.5 have not been well elucidated. METHODS The normal healthy C57BL/6 mice were exposed to concentrated ambient PM2.5 (PM) or filtered air (FA) for four weeks using "Shanghai-METAS". The urinary metabolome was quantified using liquid/gas chromatography coupled with mass spectrometry. RESULTS There were 2213 metabolites identified in total and 163 of them were significantly different between FA- and PM-exposed mice. The KEGG pathway analysis suggested that there were nine perturbed metabolic pathways related to amino acid metabolism. The amino acid metabolism what mainly impacted by PM2.5 were beta-alanine, arginine, proline, alanine, aspartate, glutamate, phenylalanine, glycine, serine, threonine and tyrosine metabolism. Meanwhile, nineteen differential metabolites related to lipid metabolism and seven differential metabolites related to glucose homeostasis were different between FA and PM mice. Furthermore, the glucose and its metabolites were significantly increased in the PM mice compared with the FA mice. CONCLUSION The current study provided a critical information on evaluating the systemic toxicity of PM2.5. The results demonstrated that there were significant alterations in urine metabolome by short-term exposure to PM, including amino acid metabolism, lipid metabolism and glucose metabolism. The metabolomics approach might be an effective tool to evaluate the potential mechanism of PM2.5 in inducing adverse health outcomes.
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Affiliation(s)
- Xihao Du
- Department of Environmental Health, School of Public Health and the Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, China
| | - Xuejiao Zeng
- Department of Environmental Health, School of Public Health and the Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, China
| | - Kun Pan
- Department of Environmental Health, School of Public Health and the Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, China
| | - Jia Zhang
- Department of Environmental Health, School of Public Health and the Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, China
| | - Liying Song
- Department of Environmental Health, School of Public Health and the Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, China
| | - Ji Zhou
- Typhoon Institute/CMA, Shanghai Key Laboratory of Meteorology and Health, Shanghai, 200030, China
| | - Renjie Chen
- Department of Environmental Health, School of Public Health and the Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, China
| | - Yuquan Xie
- Department of Cardiology, Renji Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Qinghua Sun
- Division of Environmental Health Sciences, College of Public Health, The Ohio State University, Columbus, OH, USA
| | - Jinzhuo Zhao
- Department of Environmental Health, School of Public Health and the Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, China; Typhoon Institute/CMA, Shanghai Key Laboratory of Meteorology and Health, Shanghai, 200030, China.
| | - Haidong Kan
- Department of Environmental Health, School of Public Health and the Key Laboratory of Public Health Safety, Ministry of Education, Fudan University, Shanghai, China.
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Tang ZJ, Cao ZM, Guo XW, Chen HJ, Lian Y, Zheng WJ, Chen YJ, Lian HZ, Hu X. Cytotoxicity and toxicoproteomic analyses of human lung epithelial cells exposed to extracts of atmospheric particulate matters on PTFE filters using acetone and water. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 191:110223. [PMID: 31991395 DOI: 10.1016/j.ecoenv.2020.110223] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 01/06/2020] [Accepted: 01/15/2020] [Indexed: 06/10/2023]
Abstract
Differences of cytotoxicity associated with exposure to different extracts of atmospheric particulate matters (PMs) are still not well characterized by in vitro toxicoproteomics. In this study, in vitro cytotoxicity assays and toxicoproteomic analyses were carried out to investigate toxic effects of PM collected using polytetrafluoroethylene (PTFE) filters extracted with acetone for PM2.1 and water for PM2.1 and PM10 on A549 human lung epithelial cells. The cytotoxicity assays based on cell viability, cell apoptosis and reactive oxygen species generation indicated that PM2.1 extracted with acetone had the highest toxicity. iTRAQ labeling and LC-MS/MS analyses indicated that the number of differentially expressed proteins in A549 cells affected by PM2.1 extracted with acetone was noticeably higher than that of the other two groups. Hierarchical cluster analyses showed that the influences of the extracts of PM2.1 and PM10 using water on the proteome of A549 cells were similar, whereas significantly different from the effect of PM2.1 extracted with acetone. Pathways analyses indicated that PM2.1 extracted with acetone influenced the expression of proteins involved in 14 pathways including glycolysis/gluconeogenesis, pentose phosphate pathway, proteasome, etc. PM2.1 extracted with water affected the expression of proteins involved in 3 pathways including non-homologous end-joining, ribosome and endocytosis. However, PM10 extracted with water affected the expression of proteins involved in only spliceosome pathway. The extracts of PM using different extractants to detach PM from PTFE filters influenced the cytotoxic effects of PM and the proteome of A549 cells. Therefore, extractants should be assessed carefully before the investigations on cytotoxicity to improve the compatibility of experimental results among research teams.
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Affiliation(s)
- Zhi-Jie Tang
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering and Center of Materials Analysis, Nanjing University, Nanjing, 210023, China
| | - Zhao-Ming Cao
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering and Center of Materials Analysis, Nanjing University, Nanjing, 210023, China
| | - Xue-Wen Guo
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering and Center of Materials Analysis, Nanjing University, Nanjing, 210023, China
| | - Hong-Juan Chen
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, China
| | - Yi Lian
- Department of Epidemiology, Biostatistics and Occupational Health, McGill University, QC, H3A 1A2, Canada
| | - Wei-Juan Zheng
- State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing, 210023, China
| | - Yi-Jun Chen
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering and Center of Materials Analysis, Nanjing University, Nanjing, 210023, China
| | - Hong-Zhen Lian
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering and Center of Materials Analysis, Nanjing University, Nanjing, 210023, China.
| | - Xin Hu
- State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry & Chemical Engineering and Center of Materials Analysis, Nanjing University, Nanjing, 210023, China.
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Chen S, Chen M, Wei W, Qiu L, Zhang L, Cao Q, Ying Z. Glucose Homeostasis following Diesel Exhaust Particulate Matter Exposure in a Lung Epithelial Cell-Specific IKK2-Deficient Mouse Model. ENVIRONMENTAL HEALTH PERSPECTIVES 2019; 127:57009. [PMID: 31095431 PMCID: PMC6791567 DOI: 10.1289/ehp4591] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/13/2018] [Revised: 04/25/2019] [Accepted: 04/26/2019] [Indexed: 06/09/2023]
Abstract
BACKGROUND Pulmonary inflammation is believed to be central to the pathogenesis due to exposure to fine particulate matter with aerodynamic diameter [Formula: see text] ([Formula: see text]). This central role, however, has not yet been systemically examined. OBJECTIVE In the present study, we exploited a lung epithelial cell-specific inhibitor [Formula: see text] kinase 2 (IKK2) knockout mouse model to determine the role of pulmonary inflammation in the pathophysiology due to exposure to diesel exhaust particulate matter (DEP). METHODS [Formula: see text] (lung epithelial cell-specific IKK2 knockout, KO) and [Formula: see text] (wild-type, tgWT) mice were intratracheally instilled with either vehicle or DEP for 4 months, and their inflammatory response and glucose homeostasis were then assessed. RESULTS In comparison with tgWT mice, lung epithelial cell-specific IKK2-deficient mice had fewer DEP exposure-induced bronchoalveolar lavage fluid immune cells and proinflammatory cytokines as well as fewer DEP exposure-induced circulating proinflammatory cytokines. Glucose and insulin tolerance tests revealed that lung epithelial cell-specific IKK2 deficiency resulted in markedly less DEP exposure-induced insulin resistance and greater glucose tolerance. Akt phosphorylation analyses of insulin-responsive tissues showed that DEP exposure primarily targeted hepatic insulin sensitivity. Lung epithelial cell-specific IKK2-deficient mice had significantly lower hepatic insulin resistance than tgWT mice had. Furthermore, this difference in insulin resistance was accompanied by consistent differences in hepatic insulin receptor substrate 1 serine phosphorylation and inflammatory marker expression. DISCUSSION Our findings suggest that in a tissue-specific knockout mouse model, an IKK2-dependent pulmonary inflammatory response was essential for the development of abnormal glucose homeostasis due to exposure to DEP. https://doi.org/10.1289/EHP4591.
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Affiliation(s)
- Sufang Chen
- Department of Geriatric Endocrinology, First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Minjie Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Wei Wei
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Department of Bile Pancreatic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Lianglin Qiu
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
- Department of Occupational and Environmental Health, School of Public Health, Nantong University, Nantong, China
| | - Li Zhang
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Qi Cao
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland, USA
| | - Zhekang Ying
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland, USA
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Xu Y, Wang W, Zhou J, Chen M, Huang X, Zhu Y, Xie X, Li W, Zhang Y, Kan H, Ying Z. Metabolomics analysis of a mouse model for chronic exposure to ambient PM 2.5. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 247:953-963. [PMID: 30823350 PMCID: PMC6536002 DOI: 10.1016/j.envpol.2019.01.118] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/16/2018] [Revised: 01/29/2019] [Accepted: 01/29/2019] [Indexed: 05/04/2023]
Abstract
Chronic ambient fine particulate matter (PM2.5) exposure correlates with various adverse health outcomes. Its impact on the circulating metabolome-a comprehensive functional readout of the interaction between an organism's genome and environment-has not however been fully understood. This study thus performed metabolomics analyses using a chronic PM2.5 exposure mouse model. C57Bl/6J mice (female) were subjected to inhalational concentrated ambient PM2.5 (CAP) or filtered air (FA) exposure for 10 months. Their sera were then analyzed by liquid chromatography-mass spectrometry (LC-MS) and gas chromatography-mass spectrometry (GC-MS). These analyses identified 2570 metabolites in total, and 148 of them were significantly different between FA- and CAP-exposed mice. The orthogonal partial least-squares discriminant analysis (OPLS-DA) and heatmap analyses displayed evident clustering of FA- and CAP-exposed samples. Pathway analyses identified 6 perturbed metabolic pathways related to amino acid metabolism. In contrast, biological characterization revealed that 71 differential metabolites were related to lipid metabolism. Furthermore, our results showed that CAP exposure increased stress hormone metabolites, 18-oxocortisol and 5a-tetrahydrocortisol, and altered the levels of circadian rhythm biomarkers including melatonin, retinal and 5-methoxytryptophol.
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Affiliation(s)
- Yanyi Xu
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, 200032, China; Shanghai Key Laboratory of Meteorology and Health, Shanghai Meteorological Service, Shanghai, China.
| | - Wanjun Wang
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, 200032, China.
| | - Ji Zhou
- Shanghai Key Laboratory of Meteorology and Health, Shanghai Meteorological Service, Shanghai, China.
| | - Minjie Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD, 21201, USA.
| | - Xingke Huang
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, 200032, China.
| | - Yaning Zhu
- Department of Pathology, The Affiliated Huaian No.1 People's Hospital of Nanjing Medical University, Huaian, China.
| | - Xiaoyun Xie
- Department of Interventional & Vascular Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China.
| | - Weihua Li
- Reproductive and Developmental Research Institute of Fudan University, Shanghai, 200032, China.
| | - Yuhao Zhang
- Department of Neurology, Zhongshan Hospital, Fudan University, Shanghai, 200032, China.
| | - Haidong Kan
- Department of Environmental Health, School of Public Health, Fudan University, Shanghai, 200032, China.
| | - Zhekang Ying
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, MD, 21201, USA.
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15
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Shi Y, Zhao T, Yang X, Sun B, Li Y, Duan J, Sun Z. PM 2.5-induced alteration of DNA methylation and RNA-transcription are associated with inflammatory response and lung injury. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 650:908-921. [PMID: 30308865 DOI: 10.1016/j.scitotenv.2018.09.085] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/11/2018] [Revised: 08/09/2018] [Accepted: 09/06/2018] [Indexed: 06/08/2023]
Abstract
The mechanisms of systemic pulmonary inflammation and toxicity of fine particulate matter (PM2.5) exposure remains unclear. The current study investigated the inflammatory response and lung toxicity of PM2.5 in rats following intratracheal instillation of PM2.5. After repeated (treated every 3 days for 30 days) PM2.5 exposure, total protein (TP), lactate dehydrogenase (LDH) activity and inflammatory cytokines including interleukin 6 (IL-6), interleukin 1β (IL-1β) and tumor necrosis factor α (TNF-α) levels in bronchoalveolar lavage fluid (BALF) were markedly elevated. The expression levels of IL-6, IL-1β, TNF-α and NF-κB in rat lung tissue and BEAS-2B cells were significantly upregulated after PM2.5 exposure. Histopathological evaluation suggested that the major pathological changes were alveolar wall thickening and inflammatory cell infiltration of the lungs. Genome wide DNA methylation and RNA-transcription analysis was performed on human bronchial epithelial cells (BEAS-2B) to explore the potential mechanisms in vitro. PM2.5 induced genome wide DNA methylation and transcription changes. Differentially methylated CpGs were located in gene promoter region linked with CpG islands. Integrated analysis with DNA methylation and transcription data indicated a clear bias toward transcriptional alteration by differential methylation. Disease ontology of differentially methylated and expressed genes addressed their prominent role in respiratory disease. Functional enrichment revealed their involvement in inflammation or immune response, cellular community, cellular motility, cell growth, development and differentiation, signal transduction and responses to exogenous stimuli. Gene expression validation of ACTN4, CXCL1, MARK2, ABR, PSEN1, PSMA3, PSMD1 verified their functional participation in critical biological processes and supported the microarray bioinformatics analysis. Collectively, our data shows that PM2.5 induced genome wide methylome and transcriptome alterations that could be involved in pulmonary toxicity and pathological process of respiratory disease, providing new insight into the toxicity mechanisms of PM2.5.
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Affiliation(s)
- Yanfeng Shi
- Department of Toxicology and Sanitary Chemistry, Capital Medical University, Beijing 100069, PR China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, PR China
| | - Tong Zhao
- Department of Toxicology and Sanitary Chemistry, Capital Medical University, Beijing 100069, PR China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, PR China
| | - Xiaozhe Yang
- Department of Toxicology and Sanitary Chemistry, Capital Medical University, Beijing 100069, PR China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, PR China
| | - Baiyang Sun
- Department of Toxicology and Sanitary Chemistry, Capital Medical University, Beijing 100069, PR China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, PR China
| | - Yang Li
- Department of Toxicology and Sanitary Chemistry, Capital Medical University, Beijing 100069, PR China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, PR China
| | - Junchao Duan
- Department of Toxicology and Sanitary Chemistry, Capital Medical University, Beijing 100069, PR China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, PR China.
| | - Zhiwei Sun
- Department of Toxicology and Sanitary Chemistry, Capital Medical University, Beijing 100069, PR China; Beijing Key Laboratory of Environmental Toxicology, Capital Medical University, Beijing 100069, PR China.
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Chen S, Wei W, Chen M, Qin X, Qiu L, Zhang L, Zhang Y, Cao Q, Ying Z. TNF Signaling Impacts Glucagon-Like Peptide-1 Expression and Secretion. J Mol Endocrinol 2018; 61:153-161. [PMID: 30021757 PMCID: PMC6192833 DOI: 10.1530/jme-18-0129] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2018] [Revised: 07/11/2018] [Accepted: 07/17/2018] [Indexed: 12/24/2022]
Abstract
Numerous studies have implicated tumor necrosis factor α (TNFα) in the pathogenesis of type 2 diabetes. However, the role of its primary receptor, TNF receptor 1 (TNFR1), in homeostatic regulation of glucose metabolism is still controversial. In addition to TNFα, lymphotoxin α (LTα) binds to and activates TNFR1. Thus, TNFα and LTα together are known as TNF. To delineate the role of TNF signaling in glucose homeostasis, the present study ascertained how TNF signaling deficiency affects major regulatory components of glucose homeostasis. To this end, normal diet-fed male TNFR1 deficient mice (TNFR1-/-), TNFα/LTα/LTβ triple deficient mice (TNF/LT∆3), and their littermate controls were subjected to intraperitoneal glucose tolerance test, insulin tolerance test, and oral glucose tolerance test. The present results showed that TNFR1-/- and TNF/LT∆3 mice versus their controls had comparable body weight, tolerance to intraperitoneal glucose, and sensitivity to insulin. However, their tolerance to oral glucose was significantly increased. Additionally, glucose-induced insulin secretion assessments revealed that TNFR1 or TNF/LT deficiency significantly increased oral but not intraperitoneal glucose-induced insulin secretion. Consistently, qPCR and immunohistochemistry analyses showed that TNFR1-/- and TNF/LT∆3 mice versus their controls had significantly increased ileal expression of glucagon-like peptide-1 (GLP-1), one of the primary incretins. Their oral glucose-induced secretion of GLP-1 was also significantly increased. These data collectively suggest that physiological TNF signaling regulates glucose metabolism primarily through effects on GLP-1 expression and secretion and subsequently insulin secretion.
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Affiliation(s)
- Sufang Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
- Department of Geriatric Endocrinology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, Henan 450052, P.R. China
| | - Wei Wei
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
- Department of Bile Pancreatic Surgery, Xiangya Hospital, Central South University, Changsha, Hunan, 410008, China
| | - Minjie Chen
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Xiaobo Qin
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Lianglin Qiu
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
- Department of Occupational and Environmental Health, School of Public Health, Nantong University, Nantong 226019, China
| | - Li Zhang
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Yuhao Zhang
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Qi Cao
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
| | - Zhekang Ying
- Department of Medicine Cardiology Division, University of Maryland School of Medicine, Baltimore, Maryland 21201, USA
- Address for correspondence and reprint:Zhekang Ying PhD, 20 Penn St. HSFII S022, Baltimore, MD 21201, USA, or , Tel: 410-328-2063; Fax: 410-328-1048
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Wang W, Zhou J, Chen M, Huang X, Xie X, Li W, Cao Q, Kan H, Xu Y, Ying Z. Exposure to concentrated ambient PM 2.5 alters the composition of gut microbiota in a murine model. Part Fibre Toxicol 2018; 15:17. [PMID: 29665823 PMCID: PMC5905147 DOI: 10.1186/s12989-018-0252-6] [Citation(s) in RCA: 101] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2017] [Accepted: 03/29/2018] [Indexed: 02/08/2023] Open
Abstract
Background Exposure to ambient fine particulate matter (PM2.5) correlates with abnormal glucose homeostasis, but the underlying biological mechanism has not been fully understood. The gut microbiota is an emerging crucial player in the homeostatic regulation of glucose metabolism. Few studies have investigated its role in the PM2.5 exposure-induced abnormalities in glucose homeostasis. Methods C57Bl/6J mice were exposed to filtered air (FA) or concentrated ambient PM2.5 (CAP) for 12 months using a versatile aerosol concentration enrichment system (VACES) that was modified for long-term whole-body exposures. Their glucose homeostasis and gut microbiota were examined and analysed by correlation and mediation analysis. Results Intraperitoneal glucose tolerance test (IPGTT) and insulin tolerance test (ITT) showed that CAP exposure markedly impaired their glucose and insulin tolerance. Faecal microbiota analysis demonstrated that the impairment in glucose homeostasis was coincided with decreased faecal bacterial ACE and Chao-1 estimators (the indexes of community richness), while there was no significant change in all faecal fungal alpha diversity estimators. The Pearson’s correlation analyses showed that the bacterial richness estimators were correlated with glucose and insulin tolerance, and the mediation analyses displayed a significant mediation of CAP exposure-induced glucose intolerance by the alteration in the bacterial Chao-1 estimator. LEfSe analyses revealed 24 bacterial and 21 fungal taxa differential between CAP- and FA-exposed animals. Of these, 14 and 20 bacterial taxa were correlated with IPGTT AUC and ITT AUC, respectively, and 5 fungal taxa were correlated with abnormalities in glucose metabolism. Conclusions Chronic exposure to PM2.5 causes gut dysbiosis and may subsequently contribute to the development of abnormalities in glucose metabolism.
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Affiliation(s)
- Wanjun Wang
- Department of Environmental Health, School of Public Health, Fudan University, 130 Dong'an Rd, Shanghai, 200032, China
| | - Ji Zhou
- Shanghai Key Laboratory of Meteorology and Health, Shanghai Meteorological Service, Shanghai, China
| | - Minjie Chen
- Department of Medicine Cardiology Division, School of Medicine, University of Maryland, 20 Penn St. HSFII S022, Baltimore, MD, 21201, USA
| | - Xingke Huang
- Department of Environmental Health, School of Public Health, Fudan University, 130 Dong'an Rd, Shanghai, 200032, China
| | - Xiaoyun Xie
- Department of Interventional & Vascular Surgery, Shanghai Tenth People's Hospital, Tongji University School of Medicine, Shanghai, China
| | - Weihua Li
- Reproductive and Developmental Research Institute of Fudan University, Shanghai, China
| | - Qi Cao
- Department of Diagnostic Radiology and Nuclear Medicine, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Haidong Kan
- Department of Environmental Health, School of Public Health, Fudan University, 130 Dong'an Rd, Shanghai, 200032, China.,Shanghai Key Laboratory of Meteorology and Health, Shanghai Meteorological Service, Shanghai, China
| | - Yanyi Xu
- Department of Environmental Health, School of Public Health, Fudan University, 130 Dong'an Rd, Shanghai, 200032, China. .,Shanghai Key Laboratory of Meteorology and Health, Shanghai Meteorological Service, Shanghai, China.
| | - Zhekang Ying
- Department of Environmental Health, School of Public Health, Fudan University, 130 Dong'an Rd, Shanghai, 200032, China. .,Shanghai Key Laboratory of Meteorology and Health, Shanghai Meteorological Service, Shanghai, China. .,Department of Medicine Cardiology Division, School of Medicine, University of Maryland, 20 Penn St. HSFII S022, Baltimore, MD, 21201, USA.
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