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Toxicol In Vitro ; 37: 41-49, 2016 Dec.
Article in English | MEDLINE | ID: mdl-27596524

ABSTRACT

To predict carcinogenic potential of AgNPs on the respiratory system, BEAS-2B cells (human bronchial epithelial cells) were chronically exposed to low- and non-cytotoxic dose (0.13 and 1.33µg/ml) of AgNPs for 4months (#40 passages). To assess malignant cell transformation of chronic exposure to AgNPs, several bioassays including anchorage independent agar colony formation, cell migration/invasion assay, and epithelial-mesenchymal transition (EMT) were performed in BEAS-2B cells. Chronic exposure to AgNPs showed a significant increase of anchorage independent agar colony formation and cell migration/invasion. EMT, which is the loss of epithelial markers (E-Cadherin and Keratin) and the gain of mesenchymal marker (N-cadherin and Vimentin), was induced by chronic exposure to AgNPs. These responses indicated that chronic exposure to AgNPs could acquire characteristics of tumorigenic cells from normal BEAS-2B cells. In addition, caspase-3, p-p53, p-p38, and p-JNK were significantly decreased, while p-ERK1/2 was significantly increased. MMP-9 related to cell migration/invasion was upregulated, while a MMP-9 inhibitor, TIMP-1 was down-regulated. These results indicated that BEAS-2B cells exposed to AgNPs could induce anti-apoptotic response/anoikis resistance, and cell migration/invasion by complex regulation of MAPK kinase (p38, JNK, and ERK) and p53 signaling pathways. Therefore, we suggested that long-term exposure to low-dose of AgNPs could enhance malignant cell transformation in non-tumorigenic BEAS-2B cells. Our findings provide useful information needed to assess the carcinogenic potential of AgNPs.


Subject(s)
Cell Transformation, Neoplastic/drug effects , Metal Nanoparticles/toxicity , Silver/toxicity , Antigens, CD/metabolism , Cadherins/metabolism , Caspase 3/genetics , Cell Line , Cell Movement/drug effects , Cell Survival/drug effects , Epithelial-Mesenchymal Transition , Humans , Keratins/metabolism , Matrix Metalloproteinase 9/metabolism , Proto-Oncogene Proteins c-bcl-2/genetics , RNA, Messenger/metabolism , Tissue Inhibitor of Metalloproteinase-1/metabolism , Tumor Suppressor Protein p53/genetics , Vimentin/metabolism , bcl-2-Associated X Protein/genetics
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