Oxidative DNA damage in cultured cells and rat lungs by carcinogenic nickel compounds

The increasing presence of micro- and nanoplastics (MNPLs) in the environment, and their consequent accumulation in trophic niches, could pose a potential health threat to humans, especially due to their chronic ingestion. In vitro studies using human cells are considered pertinent approaches to determine potential health risks to humans. Nevertheless, most of such studies have been conducted using short exposure times and high concentrations. Since human exposure to MNPLs is supposed to be chronic, there is a lack of information regarding the potential in vitro MNPLs effects under chronic exposure conditions. To this aim, we assessed the accumulation and potential outcomes of polystyrene nanoparticles (PSNPs), as a model of MNPLs, in undifferentiated Caco-2 cells (as models of cell target in ingestion exposures) under a relevant long-term exposure scenario, consisting of eight weeks of exposure to sub-toxic PSNPs concentrations. In such exposure conditions, culture-media was changed every 2–3 days to maintain constant exposure. The different analyzed endpoints were cytotoxicity, dysregulation of stress-related genes, genotoxicity, oxidative DNA damage, and intracellular ROS levels. These are endpoints that showed to be sensitive enough in different studies. The obtained results attest that PSNPs accumulate in the cells through time, inducing changes at the ultrastructural and molecular levels. Nevertheless, minor changes in the different evaluated genotoxicity-related biomarkers were observed. This would indicate that no DNA damage or oxidative stress is observed in the human intestinal Caco-2 cells after long-term exposure to PSNPs. This is the first study dealing with the long-term effects of PSNPs on human cultured cells.

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Acrylamide Exposure and Oxidative DNA Damage, Lipid Peroxidation and Fasting Plasma Glucose Alteration: Association and Mediation Analyses in Chinese Urban Adults

10.2337/figshare.12076134 ◽

2020 ◽

Author(s):

Bin Wang ◽

Weihong Qiu ◽

Shijie Yang ◽

Limin Cao ◽

Chunmei Zhu ◽

...

Keyword(s):

Lipid Peroxidation ◽

Dna Damage ◽

Plasma Glucose ◽

Fasting Plasma Glucose ◽

Oxidative Dna Damage ◽

Adult Population ◽

Prostaglandin F2α ◽

Mediation Analyses ◽

Mediating Role ◽

Fasting Plasma

<a>OBJECTIVE: </a>Acrylamide exposure from daily-consumed food has raised global concern. We aimed to assess the exposure-response relationships of internal acrylamide exposure with oxidative DNA damage, lipid peroxidation and fasting plasma glucose (FPG) alteration, and investigate the mediating role of oxidative DNA damage and lipid peroxidation in the association of internal acrylamide exposure with FPG. RESEARCH DESIGN AND METHODS: FPG and urinary biomarkers of oxidative DNA damage (8-hydroxy-deoxy-guanosine, 8-OHdG), lipid peroxidation (8-iso-prostaglandin-F2α, 8-iso-PGF2α) and acrylamide exposure (N-acetyl-S-(2-carbamoylethyl)-L-cysteine, AAMA; N-acetyl-S-(2-carbamoyl-2-hydroxyethyl)-L-cysteine, GAMA) were measured for 3,270 general adults from the Wuhan-Zhuhai cohort. The associations of urinary acrylamide metabolites with 8-OHdG, 8-iso-PGF2α and FPG were assessed by linear mixed models. The mediating roles of 8-OHdG and 8-iso-PGF2α were evaluated by mediation analysis. RESULTS: We found significant linear positive dose-response relationships of urinary acrylamide metabolites with 8-OHdG, 8-iso-PGF2α and FPG (except GAMA with FPG), and 8-iso-PGF2α with FPG. Each 1-unit increase in log-transformed level of AAMA, ΣUAAM (AAMA+GAMA) or 8-iso-PGF2α was associated with a 0.17-, 0.15- or 0.23-mmol/L increase in FPG, respectively (P or/and P trend<0.05). Each 1% increase in AAMA, GAMA or ΣUAAM was associated with a 0.19%, 0.27% or 0.22% increase in 8-OHdG, respectively, and a 0.40%, 0.48% or 0.44% increase in 8-iso-PGF2α, respectively (P and P trend<0.05). Increased 8-iso-PGF2α rather than 8-OHdG significantly mediated 64.29% and 76.92% of the AAMA and ΣUAAM associated-FPG increases, respectively. CONCLUSIONS: Exposure of general adult population to acrylamide was associated with FPG elevation, oxidative DNA damage and lipid peroxidation, which in turn partly mediated acrylamide-associated FPG elevation.

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Serum of 8-OHdG as a potential biomarker of oxidative DNA damage in workers exposed to harmful working environments

Russian Journal of Occupational Health and Industrial Ecology ◽

10.31089/1026-9428-2019-59-9-783-784 ◽

2020 ◽

pp. 783-783

Author(s):

I. A. Umnyagina ◽

L. A. Strakhova ◽

T. V. Blinova

Keyword(s):

Oxidative Stress ◽

Dna Damage ◽

Blood Serum ◽

Oxidative Dna Damage ◽

Working Environment ◽

Working Environments ◽

Potential Biomarker ◽

High Level ◽

Damage Marker

In the blood serum of 70% individuals exposed to harmful factors of the working environment, a high level of oxidative stress and the DNA damage marker 8-Hydroxy-2’-Deoxyguanosine (8-OHdG) were detected.

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