|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5562478||1403426||2018||10 صفحه PDF||ندارد||دانلود کنید|
â¢HT-29 and HepG2 cell lines were tested with increasing concentrations of REEs.â¢Cell proliferation, mortality and oxidative stress related genes were analyzed.â¢Higher proliferation rates in both cell lines were observed at low REE concentrations.â¢Significant up- or down-regulation of oxidative stress-related gene pathways was only shown at high concentrations of REEs.â¢The dosage of REEs represents the pivotal factor that influences cell growth.
Human HT-29 and HepG2 cell lines were employed to test the effects of increasing concentrations of two rare earth elements (REEs), namely cerium (Ce) and lanthanum (La), alone or in combination. Effects on cell proliferation were measured using MTT assay, luciferase-based assays and proliferating cell nuclear antigen expression, while cell mortality and type of cell death was determined by Annexin V-FTC test using flow cytometry. Modulation of 84 genes involved in oxidative stress pathways was also studied using RT-PCR based arrays. Major alterations in selected genes compared to basal expression levels of respective control groups were found in the cells exposed to 600Â Î¼M Ce for 48Â h. In HepG2 cells, 51 out of 84 genes were significantly up- or down-regulated, while in HT-29 cells only 16 genes were significantly up- or down-regulated. Dosage of REEs seems to be the pivotal factor for switching the biological effects from down- to up-regulation of cell growth; thus, low concentrations promoted cell survival and proliferation, but when concentrations increased, REEs exerted anti-proliferative and cytostatic/cytotoxic effects.The molecular mechanisms underlying these effects are still not well-defined and further analysis of the mechanisms that result in inhibition or induction of cell proliferation are crucially important.
Journal: Toxicology in Vitro - Volume 46, February 2018, Pages 9-18