Abstract
The mechanisms that long noncoding RNA (lncRNA) H19 binding to S-adenosylhomocysteine hydrolase (SAHH) interacted with DNA methyltransferase 1 (DNMT1) and then regulated DNA damage caused by polycyclic aromatic hydrocarbons (PAHs) remain unclear. A total of 146 occupational workers in a Chinese coke-oven plant in 2014 were included in the final analyses. We used high-performance liquid chromatography mass spectrometry (HPLC–MS) equipped to detect urine biomarkers of PAHs exposure, including 2-hydroxynaphthalene (2-NAP), 2-hydroxyfluorene (2-FLU), 9-hydroxyphenanthrene (9-PHE) and 1-hydroxypyrene (1-OHP). The levels of SAM and SAH in plasma were detected by HPLC-ultraviolet. By constructing various BEAS-2B cell models exposed to 16 μM benzo[a]pyrene (BaP) for 24 h, toxicological parameters reflecting distinct mechanisms were evaluated. We documented that urinary 1-hydroxypyrene (1-OHP) levels were positively associated with blood H19 RNA expression (OR: 1.51, 95% CI: 1.03–2.19), but opposite to plasma SAHH activity (OR: 0.63, 95% CI: 0.41–0.98) in coke oven workers. Moreover, by constructing various BEAS-2B cell models exposed to benzo[a]pyrene (BaP), we investigated that H19 binding to SAHH exaggerated DNMT1 expressions and activity. Suppression of H19 enhanced the interaction of SAHH and DNMT1 in BaP-treated cells, decreased eight-oxoguanine DNA glycosylase 1 (OGG1) methylation, reduced oxidative DNA damage and lessened S phase arrest. However, SAHH or DNMT1 single knockdown and SAHH/DNMT1 double knockdown showed the opposite trend. A H19/SAHH/DNMT1 axis was involved in OGG1 methylation, oxidative DNA damage and cell cycle arrest by carcinogen BaP.
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Abbreviations
- 1-OHP:
-
1-Hydroxypyrene
- 2-FLU:
-
2-Hydroxyfluorene
- 2-NAP:
-
2-Hydroxynaphthalene
- 9-PHE:
-
9-Hydroxyphenanthrene
- aa:
-
Amino acid
- BaP:
-
Benzo[a]pyrene
- BER:
-
Base excision repair
- DNMT:
-
DNA methyltransferase
- lncRNAs:
-
Long noncoding RNAs
- OGG1 :
-
Eight-oxoguanine DNA glycosylase 1
- PAHs:
-
Polycyclic aromatic hydrocarbons
- ROS:
-
Reactive oxygen species
- SAH:
-
S-Adenosylhomocysteine
- SAHH:
-
S-Adenosylhomocysteine hydrolase
- SAM:
-
S-Adenosylmethionine
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Acknowledgements
We thank all researchers and study population from General Hospital of Taiyuan Iron & Steel (Group) Co., Ltd. and Center of Occupational Disease Prevention of Xishan Coal Electricity (Group) Co., Ltd.
Funding
This project was supported by the grants from National Nature Science Foundation of China (No. 81273041), Research Project Supported by Shanxi Scholarship Council of China (No. HGKY2019053), Natural Science Foundation of Shanxi Province of China (No. 202103021224230), and Foundation for Talent start-up of Hubei University of Medicine (2021QDJZR027).
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Ye Fu: designed research, performed research, contributed new reagents or analytic tools, analysed data, wrote the paper. Xuejing Li: designed research, performed research, analysed data, wrote the paper. Baolong Pan: performed research, contributed new reagents or analytic tools, wrote the paper. Yingying Niu: performed research, analysed data, wrote the paper. Bin Zhang: analysed data, wrote the paper. Xinyu Zhao: analysed data, wrote the paper. Jisheng Nie: project administration, wrote the paper. Jin Yang: funding acquisition, project administration, designed research, performed research, analysed data, wrote the paper.
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Fu, Y., Li, X., Pan, B. et al. Effects of H19/SAHH/DNMT1 on the oxidative DNA damage related to benzo[a]pyrene exposure. Environ Sci Pollut Res 30, 11706–11718 (2023). https://doi.org/10.1007/s11356-022-22936-7
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DOI: https://doi.org/10.1007/s11356-022-22936-7