NEIL2 protects against oxidative DNA damage induced by sidestream smoke in human cells
Open accessAbstract
Secondhand smoke (SHS) is a confirmed lung carcinogen that introduces thousands of toxic chemicals into the lungs. SHS contains chemicals that have been implicated in causing oxidative DNA damage in the airway epithelium. Although DNA repair is considered a key defensive mechanism against various environmental attacks, such as cigarette smoking, the associations of individual repair enzymes with susceptibility to lung cancer are largely unknown. This study investigated the role of NEIL2, a DNA glycosylase excising oxidative base lesions, in human lung cells treated with sidestream smoke (SSS), the main component of SHS. To do so, we generated NEIL2 knockdown cells using siRNA-technology and exposed them to SSS-laden medium. Representative SSS chemical compounds in the medium were analyzed by mass spectrometry. An increased production of reactive oxygen species (ROS) in SSS-exposed cells was detected through the fluorescent detection and the induction of HIF-1α. The long amplicon-quantitative PCR (LA-QPCR) assay detected significant dose-dependent increases of oxidative DNA damage in the HPRT gene of cultured human pulmonary fibroblasts (hPF) and BEAS-2B epithelial cells exposed to SSS for 24 h. These data suggest that SSS exposure increased oxidative stress, which could contribute to SSS-mediated toxicity. siRNA knockdown of NEIL2 in hPF and HEK 293 cells exposed to SSS for 24 h resulted in significantly more oxidative DNA damage in HPRT and POLB than in cells with control siRNA. Taken together, our data strongly suggest that decreased repair of oxidative DNA base lesions due to an impaired NEIL2 expression in non-smokers exposed to SSS would lead to accumulation of mutations in genomic DNA of lung cells over time, thus contributing to the onset of SSS-induced lung cancer.
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The skin from THS-exposed mice exhibits higher levels of 8-OH-dG detected by TBARS and LA-qPCR assays.
“These results indicate that THS exposure causes increased levels of oxidative DNA damage in the mouse skin tissues, which is consistent with the observation that the skin from the same exposed mice exhibit higher levels of 8-OH-dG detected by both the TBARS and LA-qPCR assays [55].”
From Tobacco toxins deposited on surfaces (third hand smoke) impair wound healing (2016) · cites this paper as [55]
The Discussion (page unavailable) reports increased oxidative DNA damage measured by the same technique in human cells exposed to thirdhand smoke. The cited paper does not report a finding in mouse skin, or higher 8-OH-dG levels detected by both TBARS and LA-qPCR; its own LA-qPCR experiments used human cells exposed to sidestream smoke. (LLM, conf=0.81)
Experimental — accuracy not yet measuredTHS exposure causes increased levels of oxidative DNA damage in mouse skin tissues.
“These results indicate that THS exposure causes increased levels of oxidative DNA damage in the mouse skin tissues, which is consistent with the observation that the skin from the same exposed mice exhibit higher levels of 8-OH-dG detected by both the TBARS and LA-qPCR assays [55].”
From Tobacco toxins deposited on surfaces (third hand smoke) impair wound healing (2016) · cites this paper as [55]
The Discussion reports increased oxidative DNA damage after thirdhand-smoke exposure in human BEAS-2B cells. It also mentions damage in mouse lung, heart and liver after sidestream-smoke exposure, but does not report thirdhand-smoke exposure or 8-OH-dG measurements in mouse skin. The cited paper therefore supports the general link between smoke exposure and oxidative DNA damage, not the mouse-skin finding attributed to it. (LLM, conf=0.87)
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Cites
Thirdhand smoke causes DNA damage in human cells
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Wang, H., Guo, W., Mitra, J., Hegde, P. M., Vandoorne, T., Eckelmann, B. J., Mitra, S., Tomkinson, A. E., Van Den Bosch, L., & Hegde, M. L. (2018) · Nature Communications · doi:10.1038/s41467-018-06111-6 · Cited by 205 · see citing works
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Guerrero, E. N., Mitra, J., Wang, H., Rangaswamy, S., Hegde, P. M., Basu, P., Rao, K. S., & Hegde, M. L. (2019) · Human Molecular Genetics · doi:10.1093/hmg/ddz062 · Cited by 68 · see citing works
Tobacco toxins deposited on surfaces (third hand smoke) impair wound healing
Dhall, S., Alamat, R., Castro, A., Sarker, A. H., Mao, J.-H., Chan, A., Hang, B., & Martins-Green, M. (2016) · Clinical Science · doi:10.1042/cs20160236 · Cited by 55 · see citing works
Self-citation
- Authors
- Sarker, A. H., Chatterjee, A., Williams, M., Lin, S., Havel, C., Jacob III, P., Boldogh, I., Hazra, T. K., Talbot, P., & Hang, B.
- Affiliations
- Lawrence Berkeley National Laboratory (US)
- The University of Texas Medical Branch at Galveston (US)
- University of California, Riverside (US)
- San Francisco General Hospital (US)
- Corresponding author
- Sarker, Altaf H.
- Hang, Bo
- Venue
- PLoS ONE
- Publisher
- Public Library of Science (PLoS)
- Published
- 2014-03-03
- Volume
- 9
- Issue
- 3
- Pages
- e90261
- ISSN
- 1932-6203 (ISSN-L)
- PMC
- PMC3945017
- OpenAlex
- W2010426936
- Cited by
- 44
- References
- 1
- Citations by year
- 2026: 1 · 2025: 3 · 2024: 6 · 2023: 1 · 2022: 3 · 2021: 4 · 2020: 5 · 2019: 5 · 2018: 6 · 2017: 4 · 2016: 2 · 2015: 1 · 2014: 3
- FWCI
- 1.37
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- PLoS ONE (publishedVersion, cc-by)
- Europe PMC (PubMed Central) (publishedVersion, other-oa)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- OSTI OAI (U.S. Department of Energy Office of Scientific and Technical Information) (submittedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- eScholarship (California Digital Library) (submittedVersion)
- Figshare (submittedVersion, cc-by)
- Funders
- U.S. Department of Energy (-AC02-05CH11231, 05CH11231, 19XT-0070, DE AC02 05CH11231, DE-AC02-)
- Tobacco-Related Disease Research Program (DE-AC02-05CH11231, 20PT-0184, 19XT-0070)
- Flight Attendant Medical Research Institute
- National Institutes of Health (DE-AC02–05CH11231, 19XT-0070, CA092584)
- University of California, San Francisco
- National Institute on Drug Abuse (P30DA012393)
- National Cancer Institute (CA-092584, R01CA063503, CA63503, P01CA092584)
- National Center for Research Resources (S10RR026437)
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › DNA Repair Mechanisms
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Carcinogens and Genotoxicity Assessment
- Health Sciences › Medicine › Physiology › Smoking Behavior and Cessation
- Keywords
- NEIL2, passive smoking, sidestream smoke, oxidative DNA damage, DNA glycosylase, DNA repair, reactive oxygen species, HIF-1α, lung cancer, lung fibroblasts, BEAS-2B cells, HPRT, POLB, oxidative stress
- MeSH terms
- Base Sequence, Cell Line, Culture Media, DNA Damage, Humans, Hypoxanthine Phosphoribosyltransferase, Lung, Lung Neoplasms, Smoke, Reactive Oxygen Species, Oxidative Stress, RNA, Small Interfering, DNA-(Apurinic or Apyrimidinic Site) Lyase, DNA Glycosylases, Hypoxia-Inducible Factor 1, alpha Subunit
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