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Zhao L, Zhang M, Bai L, Zhao Y, Cai Z, Yung KKL, Dong C, Li R. Real-world PM 2.5 exposure induces pathological injury and DNA damage associated with miRNAs and DNA methylation alteration in rat lungs. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:28788-28803. [PMID: 34988794 DOI: 10.1007/s11356-021-17779-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2021] [Accepted: 11/23/2021] [Indexed: 06/14/2023]
Abstract
Fine particulate matter (PM2.5) has been demonstrated to threaten public health and increase lung cancer risk. DNA damage is involved in the pathogenesis of lung cancer. However, the mechanisms of epigenetic modification of lung DNA damage are still unclear. This study developed a real-world air PM2.5 inhalation system and exposed rats for 1 and 2 months, respectively, and investigated rat lungs pathological changes, inflammation, oxidative stress, and DNA damage effects. OGG1 and MTH1 expression was measured, along with their DNA methylation status and related miRNAs expression. The results showed that PM2.5 exposure led to pathological injury, influenced levels of inflammatory cytokines and oxidative stress factors in rat lungs. Of note, 2-month PM2.5 exposure aggravated pathological injury. Besides, PM2.5 significantly elevated OGG1 expression and suppressed MTH1 expression, which was correlated to oxidative stress and partially mediated by reducing OGG1 DNA methylation status and increasing miRNAs expression related to MTH1 in DNA damage with increases of γ-H2AX, 8-OHdG and GADD153. PM2.5 also activated c-fos and c-jun levels and inactivated PTEN levels in rat lungs. These suggested that epigenetic modification was probably a potential mechanism by which PM2.5-induced genotoxicity in rat lungs.
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Affiliation(s)
- Lifang Zhao
- Institute of Environmental Science, Shanxi University, Taiyuan, China
| | - Mei Zhang
- Institute of Environmental Science, Shanxi University, Taiyuan, China
| | - Lirong Bai
- Institute of Environmental Science, Shanxi University, Taiyuan, China
| | - Yufei Zhao
- Institute of Environmental Science, Shanxi University, Taiyuan, China
| | - Zongwei Cai
- State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University, Hong Kong SAR, China
| | - Ken Kin Lam Yung
- Institute of Environmental Science, Shanxi University, Taiyuan, China
- Department of Biology, Hong Kong Baptist University, Hong Kong SAR, China
| | - Chuan Dong
- Institute of Environmental Science, Shanxi University, Taiyuan, China.
| | - Ruijin Li
- Institute of Environmental Science, Shanxi University, Taiyuan, China.
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Fu Y, Wang W, Li X, Liu Y, Niu Y, Zhang B, Nie J, Pan B, Wang R, Yang J. LncRNA H19 interacts with S-adenosylhomocysteine hydrolase to regulate LINE-1 Methylation in human lung-derived cells exposed to Benzo[a]pyrene. CHEMOSPHERE 2018; 207:84-90. [PMID: 29772428 DOI: 10.1016/j.chemosphere.2018.05.048] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Revised: 05/04/2018] [Accepted: 05/08/2018] [Indexed: 06/08/2023]
Abstract
Benzo [a]pyrene (BaP) have been demonstrated to induce lung cancer risk in humans and many different animal models, with aberrant gene methylation as one of the epigenetic errors; however, the molecular mechanisms remain unclear. Here, we used three types of human lung-derived cells with BaP exposure as a model and attempted to investigate the long non-coding RNA (lncRNA) H19/S-adenosylhomocysteine hydrolase (SAHH) pathway that regulates gene methylation in vitro exposure to BaP. Results showed that compared to the controls, BaP-treated cells H19 expressions were increased in a dose- and time-dependent manner, whereas SAHH protein expressions were decreased. Indeed, H19 binds to and attenuates SAHH expressions and activity, and this interaction will be enhanced by BaP. However, suppression of H19 exaggerates SAHH protein expression and activity exposed to BaP. Although BaP-treated cells H19 single knockdown expectedly increased long interspersed nuclear elements-1 (LINE-1) methylation and inhibited benzo [a]pyrene-7,8-dihydrodiol-9,10-epoxide (BPDE) -DNA adducts formation with altering SAHH protein expressions and activity, the double knockdown restored methylation to the control level and exacerbated BPDE-DNA adducts formation. Overall, our results uncover a H19/SAHH circuit involving gene-methylation alterations by carcinogen BaP.
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Affiliation(s)
- Ye Fu
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Wubin Wang
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Xuejing Li
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Yanli Liu
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Yingying Niu
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Bin Zhang
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Jisheng Nie
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Baolong Pan
- General Hospital of Taiyuan Iron & Steel (Group) Co., Ltd, Taiyuan 030008, China
| | - Ruisheng Wang
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, China
| | - Jin Yang
- Department of Occupational Health, School of Public Health, Shanxi Medical University, Taiyuan 030001, China.
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Yang J, Chen W, Fan Y, Zhang H, Wang W, Zhang H. Ubiquitin Protein Ligase Ring2 Is Involved in S-phase Checkpoint and DNA Damage in Cells Exposed to Benzo[a]pyrene. J Biochem Mol Toxicol 2016; 30:481-488. [PMID: 27095601 DOI: 10.1002/jbt.21811] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 03/11/2016] [Accepted: 03/22/2016] [Indexed: 01/08/2023]
Abstract
Previous studies in our laboratory demonstrated that Ring2 may affect DNA damage and repair through pathways other than through regulating the expression of the nucleotide excision repair protein. In a series of experiments using wild-type cell (16HBE and WI38) and small interfering RNA (siRNA) Ring2 cells exposed to benzo[a]pyrene (BaP), we evaluated the cell cycle and DNA damage. The benzo(a)pyrene-7,8-dihydrodiol-9,10-epoxide (BPDE-DNA) adduct assay demonstrated that in vitro exposure to BaP increased DNA damage in a time- and dose-dependent manner in wild-type and siRNA Ring2 cells. Analysis of covariance showed that a decrease of Ring2 caused DNA hypersensitivity to BaP. Flow cytometry results and proliferating cell nuclear antigen levels indicated that inhibition of Ring2 attenuated the effect of BaP on S-phase arrest. Taken together, these data implied that the lower proportion of cells in the S phase induced by inhibition of Ring2 may play an important role in DNA hypersensitivity to BaP.
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Affiliation(s)
- Jin Yang
- Department of Occupational Health, School of Public Health, Shanxi Medical University, 030001, Taiyuan, People's Republic of China.
| | - Wentao Chen
- Department of Occupational Health, School of Public Health, Shanxi Medical University, 030001, Taiyuan, People's Republic of China
| | - Yanfeng Fan
- Department of Occupational Health, School of Public Health, Shanxi Medical University, 030001, Taiyuan, People's Republic of China
| | - Huitao Zhang
- Department of Occupational Health, School of Public Health, Shanxi Medical University, 030001, Taiyuan, People's Republic of China
| | - Wubin Wang
- Department of Occupational Health, School of Public Health, Shanxi Medical University, 030001, Taiyuan, People's Republic of China
| | - Hongjie Zhang
- Department of Occupational Health, School of Public Health, Shanxi Medical University, 030001, Taiyuan, People's Republic of China
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Chen DH, Huang Y, Ruan Y, Shen WH. The evolutionary landscape of PRC1 core components in green lineage. PLANTA 2016; 243:825-46. [PMID: 26729480 DOI: 10.1007/s00425-015-2451-9] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Accepted: 12/16/2015] [Indexed: 05/20/2023]
Abstract
The origin and evolution of plant PRC1 core components. Polycomb repressive complex1 (PRC1) plays critical roles in epigenetic silencing of homeotic genes and determination of cell fate. Animal PRC1 has been well investigated for a long time, whereas plant PRC1 was just confirmed in recent years. It is enigmatic whether PRC1 core components in plants share a common ancestor with those in animals. We evaluated the origin of plant PRC1 RING-finger proteins (RING1 and BMI1) through comparing with the homologs in some representative unikonts and using BMI1- and RING1-like proteins as reciprocal outgroup, finding both PRC1 RING-finger proteins have the earliest origin in mosses, similar to LHP1. Additionally, the gene structure, copy number, and domain organization were analyzed to deeply understand the evolutionary history of plant PRC1 complex. In conclusion, PRC1 RING-finger proteins have independent origins in plants and animals, but convergent evolution might attribute to the conservation of PRC1 complex in plants and animals. Plant LHP1 as the homolog of non-PRC1 protein HP1 was recruited to fulfill the role of Pc counterpart. Gene duplication followed by functional divergence makes a great contribution to evolutionary progress of PRC1 in green plants.
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Affiliation(s)
- Dong-hong Chen
- College of Bioscience and Biotechnology, International Associated Laboratory of CNRS-Fudan-HUNAU on Plant Epigenome Research, Hunan Agricultural University, 410128, Changsha, China.
| | - Yong Huang
- College of Bioscience and Biotechnology, International Associated Laboratory of CNRS-Fudan-HUNAU on Plant Epigenome Research, Hunan Agricultural University, 410128, Changsha, China
| | - Ying Ruan
- College of Bioscience and Biotechnology, International Associated Laboratory of CNRS-Fudan-HUNAU on Plant Epigenome Research, Hunan Agricultural University, 410128, Changsha, China.
| | - Wen-Hui Shen
- College of Bioscience and Biotechnology, International Associated Laboratory of CNRS-Fudan-HUNAU on Plant Epigenome Research, Hunan Agricultural University, 410128, Changsha, China
- Institut de Biologie Moléculaire des Plantes du CNRS, Université de Strasbourg, 12 rue du Général Zimmer, 67084, Strasbourg Cedex, France
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Traversi D, Cervella P, Gilli G. Evaluating the genotoxicity of urban PM2.5 using PCR-based methods in human lung cells and the Salmonella TA98 reverse test. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:1279-1289. [PMID: 25138555 DOI: 10.1007/s11356-014-3435-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Accepted: 08/10/2014] [Indexed: 06/03/2023]
Abstract
A number of compounds found in particulate matter with an aerodynamic diameter <2.5 (PM2.5) can interact with DNA either directly or after enzymatic transformation to induce DNA modifications. These particulate matter (PM)-induced alterations in DNA may be associated with increased frequencies of pollution-associated diseases, such as lung cancer. In the present study, we applied different methods to assess the mutagenicity and genotoxicity of monthly PM2.5 organic extracts collected over a full year. We used the Salmonella assay, exposed cultured human embryonic lung fibroblasts and applied extracellular lactate dehydrogenase (LDH) and 2,3-bis[2-methoxy-4-nitro-5-sulfophenyl]-2H-tetrazolium-5-carboxyanilide inner salt (XTT) assays to assess the cytotoxicity of PM2.5 on the cells. We assessed both the expression levels of a number of DNA repair genes (using qRT-qPCR) and the genetic profile of the treated cells compared to the control. The expression levels of XRCC1 and APE1, which are involved in the first steps of base excision repair, as well as ERCC1, XPA and XPF, which encode nucleotide excision repair subunits, were analysed. The monthly mean of the PM2.5 collected was 35.16 ± 22.06 μg/m(3). The mutagenicity of PM2.5 to TA98 was 46 ± 50 net revertants/m(3), while the mutagenicity to TA98 + S9 was 17 ± 19 net revertants/m(3). The mean IC50 values were 2.741 ± 1.414 and 3.219 ± 2.764 m(3) of equivalent air in the XTT and LDH assays, respectively. A marked and significant increase in APE1 expression levels was observed in the exposed cells. This effect was also significantly correlated with mutagenicity (p < 0.01). No induced AFLP fragment profile alterations were detected. The proposed approach seems to be useful for integrated evaluation and for highlighting the mechanisms inducing DNA damage.
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Affiliation(s)
- Deborah Traversi
- Department of Public Health and Paediatrics, University of Torino, piazza Polonia 94, 10126, Torino, Italy,
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