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  • 1
    Online Resource
    Online Resource
    Wiley ; 2017
    In:  Basic & Clinical Pharmacology & Toxicology Vol. 121, No. S3 ( 2017-09), p. 55-62
    In: Basic & Clinical Pharmacology & Toxicology, Wiley, Vol. 121, No. S3 ( 2017-09), p. 55-62
    Abstract: A number of biological responses may contribute to the carcinogenic effects of combustion‐derived particulate matter ( CPM ). Here, we focus on mechanisms that trigger CPM ‐induced pro‐inflammatory responses. Inflammation has both genotoxic and non‐genotoxic implications and is considered to play a central role in development of various health outcome associated with CPM exposure, including cancer. Chronic, low‐grade inflammation may cause DNA damage through a persistent increased level of reactive oxygen species ( ROS ) produced and released by activated immune cells. Moreover, a number of pro‐inflammatory cytokines and chemokines display mitogenic, motogenic, morphogenic and/or angiogenic properties and may therefore contribute to tumour growth and metastasis. The key triggering events involved in activation of pro‐inflammatory responses by CPM and soluble CPM components can be categorized into (i) formation of ROS and oxidative stress, (ii) interaction with the lipid layer of cellular membranes, (iii) activation of receptors, ion channels and transporters on the cell surface and (iv) interactions with intracellular molecular targets including receptors such as the aryl hydrocarbon receptor (AhR). In particular, we will elucidate the effects of diesel exhaust particles ( DEP ) using human lung epithelial cells as a model system.
    Type of Medium: Online Resource
    ISSN: 1742-7835 , 1742-7843
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2017
    detail.hit.zdb_id: 2151592-X
    SSG: 15,3
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  • 2
    In: Basic & Clinical Pharmacology & Toxicology, Wiley, Vol. 132, No. 1 ( 2023-01), p. 83-97
    Abstract: Exposure to fine particulate matter (PM 2.5 ) from incomplete fossil fuel combustion (coal, oil, gas and diesel) has been linked to increased morbidity and mortality due to metabolic diseases. PM 2.5 exaggerate adipose inflammation and insulin resistance in mice with diet‐induced obesity. Here, we elucidate the hypothesis that such systemic effects may be triggered by adhered particle components affecting adipose tissue directly. Studying adipocytes differentiated from primary human mesenchymal stem cells, we found that lipophilic organic chemicals (OC) from diesel exhaust particles induced inflammation‐associated genes and increased secretion of the chemokine CXLC8/interleukin‐8 as well as matrix metalloprotease 1. The oxidative stress response gene haem oxygenase‐1 and tumour necrosis factor alpha were seemingly not affected, while aryl hydrocarbon receptor‐regulated genes, cytochrome P450 1A1 (CYP1A1) and CYP1B1 and plasminogen activator inhibitor‐2, were clearly up‐regulated. Finally, expression of β‐adrenergic receptor, known to regulate adipocyte homoeostasis, was down‐regulated by exposure to these lipophilic OC. Our results indicate that low concentrations of OC from combustion particles have the potential to modify expression of genes in adipocytes that may be linked to metabolic disease. Further studies on mechanisms linking PM exposure and metabolic diseases are warranted.
    Type of Medium: Online Resource
    ISSN: 1742-7835 , 1742-7843
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2023
    detail.hit.zdb_id: 2151592-X
    SSG: 15,3
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    Wiley ; 2019
    In:  Basic & Clinical Pharmacology & Toxicology Vol. 125, No. 3 ( 2019-09), p. 304-314
    In: Basic & Clinical Pharmacology & Toxicology, Wiley, Vol. 125, No. 3 ( 2019-09), p. 304-314
    Abstract: Reactive oxygen species (ROS) is regarded as a critical denominator in nanoparticle toxicology and inflammation. Previously, we have shown that silica nanoparticles sized 50 nm (Si50) induce release of CXCL8 and IL‐6 from BEAS‐2B cells, via mechanisms involving NFκB, p38 MAP kinase and TGF‐α‐activated EGF receptor. In the present study, the role of ROS‐mediated mechanisms in the concentration‐dependent Si50 induction of CXCL8 and IL‐6 responses was examined. Si50 (200 µg/mL) induced a time‐dependent ROS formation and a postponed increase in expression of haem oxygenase (HO‐1) mRNA and protein. Pre‐treatment with the ROS inhibitors N‐acetyl cysteine (NAC) and diphenyleneiodonium (DPI) partially attenuated CXCL8 and IL‐6 responses to 200 µg/mL, but not to 100 µg/mL Si50. The release of TGF‐α induced by Si50 (200 µg/mL) was significantly reduced by NAC, but not by DPI nor siRNA against NADPH oxidase DUOX‐1 (siDUOX‐1). Furthermore, siDUOX‐1 reduced Si50‐induced CXCL8, but not IL‐6. Both p38 and p65 phosphorylations were inhibited by siDUOX‐1, but for NAC only p65 phosphorylation reached a significant reduction. Neither NAC nor DPI reduced Si50‐induced CXCL8 and IL‐6 gene expressions. In conclusion, Si50‐induced CXCL8 and IL‐6 involved both ROS‐dependent and ROS‐independent mechanisms. Notably, the role of ROS seemed restricted to effects of higher concentrations of Si50 and not mediated via the gene expression.
    Type of Medium: Online Resource
    ISSN: 1742-7835 , 1742-7843
    URL: Issue
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2151592-X
    SSG: 15,3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
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