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Cui J, Chen W, Zhang D, Lu M, Huang Z, Yi B. Metformin attenuates PM 2.5-induced oxidative stress by inhibiting the AhR/CYP1A1 pathway in proximal renal tubular epithelial cells. Toxicol Mech Methods 2024; 34:1022-1034. [PMID: 39034811 DOI: 10.1080/15376516.2024.2378296] [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: 01/21/2024] [Revised: 06/30/2024] [Accepted: 07/01/2024] [Indexed: 07/23/2024]
Abstract
The harmful effects of PM2.5 on human health, including an increased risk of chronic kidney disease (CKD), have raised a lot of attention, but the underlying mechanisms are unclear. We used the Shanghai Meteorological and Environmental Animal Exposure System (Shanghai-METAS) to simulate the inhalation of PM2.5 in the real environment and established an animal model by exposing C57BL/6 mice to filtered air (FA) and Particulate Matter (PM2.5) for 8 weeks. PM2.5 impaired the renal function of the mice, and the renal tubules underwent destructive changes. Analysis of NHANES data showed a correlation between reduced kidney function and higher blood levels of PM2.5 components, polychlorinated biphenyls (PCBs) and dioxins, which are Aryl hydrocarbon Receptor (AhR) ligands. PM2.5 exposure induced higher levels of AhR and CYP1A1 and oxidative stress as evidenced by the higher levels of ROS, MDA, and GSSG in kidneys of mice. PM2.5 exposure led to AhR overexpression and nuclear translocation in proximal renal tubular epithelial cells. Inhibition of AhR reduced CYP1A1 expression and PM2.5-increased levels of ROS, MDA and GSSG. Our study suggested metformin can mitigate PM2.5-induced oxidative stress by inhibiting the AhR/CYP1A1 pathway. These findings illuminated the role of AhR/CYP1A1 pathway in PM2.5-induced kidney injury and the protective effect of metformin on PM2.5-induced cellular damage, offering new insights for air pollution-related renal diseases.
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Affiliation(s)
- Jing Cui
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
- Clinical Research Center for Critical Kidney Disease in Hunan Province, Changsha, Hunan, China
| | - Weilin Chen
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
- Clinical Research Center for Critical Kidney Disease in Hunan Province, Changsha, Hunan, China
| | - Dongdong Zhang
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
- Clinical Research Center for Critical Kidney Disease in Hunan Province, Changsha, Hunan, China
| | - Mengqiu Lu
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
- Clinical Research Center for Critical Kidney Disease in Hunan Province, Changsha, Hunan, China
| | - Zhijun Huang
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
- Clinical Research Center for Critical Kidney Disease in Hunan Province, Changsha, Hunan, China
- Center for Clinical Pharmacology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
| | - Bin Yi
- Department of Nephrology, The Third Xiangya Hospital, Central South University, Changsha, Hunan, China
- Clinical Research Center for Critical Kidney Disease in Hunan Province, Changsha, Hunan, China
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Somayajulu M, Wright R, Muhammed F, McClellan SA, Ibrahim A, Hazlett LD. PM 10 dysregulates epithelial barrier function in human corneal epithelial cells that is restored by antioxidant SKQ1. Toxicol Appl Pharmacol 2024:117122. [PMID: 39393465 DOI: 10.1016/j.taap.2024.117122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2024] [Revised: 10/03/2024] [Accepted: 10/05/2024] [Indexed: 10/13/2024]
Abstract
Exposure to airborne particulate <10 μm (PM10) adversely affects the ocular surface. This study tested PM10 on epithelial barrier integrity in immortalized human corneal epithelial cells (HCE-2) and mouse cornea, and whether antioxidant SKQ1 is restorative. HCE-2 were exposed to 100 μg/ml PM10 ± SKQ1 for 24 h. An Electric Cell-Substrate Impedance Sensing (ECIS) system monitored the impact of PM10. RT-PCR, western blotting and immunofluorescence measured levels of barrier and associated proteins, stanniocalcin 2 (STC2), and a kit measured total calcium. In vivo, female C57BL/6 mice were exposed to either control air or PM10 (±SKQ1) in a whole-body exposure chamber, and barrier associated proteins tested. Tight junction and mucins proteins in the cornea were tested. In HCE-2, PM0 vs control significantly reduced mRNA and protein levels of tight junction and adherence proteins, and mucins. ECIS data demonstrated that PM10 vs control cells exhibited a significant decrease in epithelial barrier strength at 4000 Hz indicated by reduced impedance and resistance. PM10 also upregulated STC2 protein and total calcium levels. In vivo, PM10 vs control reduced zonula occludens 1 and mucins. SKQ1 pre-treatment reversed PM10 effects both in vitro and in vivo. In conclusion, PM10 exposure reduced tight junction and mucin proteins, and compromised the seal between cells in the corneal epithelium leading to decreased epithelial barrier strength. This effect was reversed by SKQ1. Since the corneal epithelium forms the first line of defense against air pollutants, including PM10, preserving its integrity using antioxidants such as SKQ1 is crucial in reducing the occurrence of ocular surface disorders.
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Affiliation(s)
- Mallika Somayajulu
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University, School of Medicine, Detroit, MI 48201, USA
| | - Robert Wright
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University, School of Medicine, Detroit, MI 48201, USA
| | - Farooq Muhammed
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University, School of Medicine, Detroit, MI 48201, USA
| | - Sharon A McClellan
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University, School of Medicine, Detroit, MI 48201, USA
| | - Ahmed Ibrahim
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University, School of Medicine, Detroit, MI 48201, USA; Department of Pharmacology, Wayne State University, School of Medicine, Detroit, MI 48201, USA
| | - Linda D Hazlett
- Department of Ophthalmology, Visual and Anatomical Sciences, Wayne State University, School of Medicine, Detroit, MI 48201, USA.
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Cesaroni G, Jaensch A, Renzi M, Marino C, Ferraro PM, Kerschbaum J, Haller P, Brozek W, Michelozzi P, Stafoggia M, de Hoogh K, Brunekreef B, Hoek G, Zitt E, Forastiere F, Nagel G, Weinmayr G. Association of air pollution with incidence of end-stage kidney disease in two large European cohorts. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 948:174796. [PMID: 39032743 DOI: 10.1016/j.scitotenv.2024.174796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/13/2024] [Revised: 07/12/2024] [Accepted: 07/12/2024] [Indexed: 07/23/2024]
Abstract
End-stage kidney disease (ESKD) poses a high burden on patients and health systems. While numerous studies indicate an association between air pollution and chronic kidney disease, studies on ESKD are rare. We investigated the association of long-term exposure to nitrogen dioxide (NO₂), fine particulate matter (PM2.5), black carbon (BC) and ozone (O3) with ESKD incidence in two large population-based European cohorts. We followed individuals in the Austrian Vorarlberg Health Monitoring and Promotion Program (VHM&PP) and the Italian Rome Longitudinal Study (RoLS) using dialysis and kidney transplant registries. Long-term exposure to pollutants was estimated at the home address using Europe-wide land use regression models at 100x100m scale. Hazard ratios (HR) were determined from Cox-proportional hazard models adjusted for individual and neighbourhood level confounders. We observed 501 events among 136,823 individuals in VHM&PP (mean age 42.1 years; crude incidence rate (IR) 0.14 per 1000 person-years) and 3231 events among 1,939,461 individuals in RoLS (mean age 52.4 years; IR 0.22 per 1000 person-years). In VHM&PP, there was no evidence of an association between PM2.5 or O3 and ESKD. There were elevated HRs but with large confidence intervals for BC (HR 1.17 [95 % confidence interval (CI): 0.98, 1.39] for 0.5*10-5/m), and for NO₂ (HR 1.14 [95%CI: 0.96, 1.35] for 10 μg/m3). In RoLS, ESKD was associated with PM2.5 (HR 1.37 [95 % CI: 1.06, 1.76] for an increase of 5 μg/m3), while there was no evidence of association with BC, NO2, or O3 exposure. Our study suggests an association of air pollution with ESKD incidence, which differed between the two cohorts and may possibly be influenced by respective air pollution mixtures.
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Affiliation(s)
- Giulia Cesaroni
- Department of Epidemiology, Lazio Region Health Service/ASL Roma 1, Rome, Italy
| | - Andrea Jaensch
- Institute of Epidemiology and Medical Biometry, Ulm University, Ulm, Germany
| | - Matteo Renzi
- Department of Epidemiology, Lazio Region Health Service/ASL Roma 1, Rome, Italy
| | - Claudia Marino
- Department of Epidemiology, Lazio Region Health Service/ASL Roma 1, Rome, Italy
| | | | - Julia Kerschbaum
- Department of Internal Medicine IV, Medical University of Innsbruck, Innsbruck, Austria; Austrian Dialysis and Transplant Registry (OEDTR), Medical University of Innsbruck, Innsbruck, Austria
| | - Patrizia Haller
- Department of Internal Medicine 3, LKH Feldkirch, Feldkirch, Austria
| | - Wolfgang Brozek
- Agency for Preventive and Social Medicine (aks), Bregenz, Austria
| | - Paola Michelozzi
- Department of Epidemiology, Lazio Region Health Service/ASL Roma 1, Rome, Italy
| | - Massimo Stafoggia
- Department of Epidemiology, Lazio Region Health Service/ASL Roma 1, Rome, Italy
| | - Kees de Hoogh
- Swiss Tropical and Public Health Institute, Basel, Switzerland; University of Basel, Basel, Switzerland
| | - Bert Brunekreef
- Institute for Risk Assessment Sciences, Utrecht University, Utrecht, the Netherlands
| | - Gerard Hoek
- Institute for Risk Assessment Sciences, Utrecht University, Utrecht, the Netherlands
| | - Emanuel Zitt
- Department of Internal Medicine 3, LKH Feldkirch, Feldkirch, Austria; Agency for Preventive and Social Medicine (aks), Bregenz, Austria; Vorarlberg Institute for Vascular Investigation and Treatment (VIVIT), Feldkirch, Austria
| | - Francesco Forastiere
- Environmental Research Group, School of Public Health, Faculty of Medicine, Imperial College, London, UK; National Research Council, IFT, Palermo, Italy
| | - Gabriele Nagel
- Institute of Epidemiology and Medical Biometry, Ulm University, Ulm, Germany; Agency for Preventive and Social Medicine (aks), Bregenz, Austria
| | - Gudrun Weinmayr
- Institute of Epidemiology and Medical Biometry, Ulm University, Ulm, Germany.
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Xu W, Jia L, Lin Y, Zhang C, Sun X, Jiang L, Yao X, Wang N, Deng H, Wang S, Yang G. Association of air pollution and risk of chronic kidney disease: A systematic review and meta-analysis. J Biochem Mol Toxicol 2024; 38:e23610. [PMID: 38091339 DOI: 10.1002/jbt.23610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2023] [Accepted: 11/20/2023] [Indexed: 01/18/2024]
Abstract
Although epidemiological studies have evaluated the association between ambient air pollution and chronic kidney disease (CKD), the results remain mixed. To clarify the nature of the association, we conducted a comprehensive systematic review and meta-analysis to assess the global relationship between air pollution and CKD. The Web of Science, PubMed, Embase and Cochrane Library databases systematically were searched for studies published up to July 2023 and included 32 studies that met specific criteria. The random effects model was used to derive overall risk estimates for each pollutant. The meta-analysis estimated odds ratio (ORs) of risk for CKD were 1.42 (95% confidence interval [CI]: 1.31-1.54) for each 10 μg/m3 increase in PM2.5 ; 1.20 (95% CI: 1.14-1.26) for each 10 μg/m3 increase in PM10 ; 1.07 (95% CI: 1.05-1.09) for each 10 μg/m3 increase in NO2 ; 1.03 (95% CI: 1.02-1.03) for each 10 μg/m3 increase in NOX ; 1.07 (95% CI: 1.01-1.12) for each 1 ppb increase in SO2 ; 1.03 (95% CI: 1.00-1.05) for each 0.1 ppm increase in CO. Subgroup analysis showed that this effect varied by gender ratio, age, study design, exposure assessment method, and income level. Furthermore, PM2.5 , PM10 , and NO2 had negative effects on CKD even within the World Health Organization-recommended acceptable concentrations. Our results further confirmed the adverse effect of air pollution on the risk of CKD. These findings can contribute to enhance the awareness of the importance of reducing air pollution among public health officials and policymakers.
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Affiliation(s)
- Wenqi Xu
- Department of Food Nutrition and Safety, Dalian Medical University, Dalian, China
| | - Luzhu Jia
- Department of Epidemiology, Dalian Medical University, Dalian, China
| | - Yuxuan Lin
- Department of Food Nutrition and Safety, Dalian Medical University, Dalian, China
| | - Cong Zhang
- Department of Food Nutrition and Safety, Dalian Medical University, Dalian, China
| | - Xiance Sun
- Department of Occupational & Environmental Health, Dalian Medical University, Dalian, China
| | - Liping Jiang
- Department of Occupational & Environmental Health, Dalian Medical University, Dalian, China
| | - Xiaofeng Yao
- Department of Occupational & Environmental Health, Dalian Medical University, Dalian, China
| | - Ningning Wang
- Department of Food Nutrition and Safety, Dalian Medical University, Dalian, China
| | - Haoyuan Deng
- Department of Food Nutrition and Safety, Dalian Medical University, Dalian, China
| | - Shaopeng Wang
- Department of Cardiology, The First Affiliated Hospital of Dalian Medical University, Dalian, China
| | - Guang Yang
- Department of Food Nutrition and Safety, Dalian Medical University, Dalian, China
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