Published gene expression studies for radiation-induced thyroid carcinogenesis have used various

Published gene expression studies for radiation-induced thyroid carcinogenesis have used various methodologies. the immune response, Vortioxetine hydrobromide manufacture regulation of transcription, and receptor signaling pathways. Overall, the altered genes in high-dose rate (HDR) 5 Gy and low-dose rate (LDR) 10 Gy were more than those of LDR 5 Gy and HDR 10 Gy. Thus, we investigated genes associated with aggressive tumor development using the two dosage treatments. In this study, the Vortioxetine hydrobromide manufacture identified gene expression profiles reflect the molecular response following high doses of external radiation exposure and may provide helpful information about radiation-induced thyroid tumors in the high-dose range. rearrangements have been observed in radiation-associated PTCs, which develop after exposure to radioiodine or external radiation [12C13]. Also, rearrangements are preferentially induced in a dose-dependent manner with high dosages of radiation and [14C15]. The exact biological mechanism of radiation-induced thyroid carcinogenesis mediated by genetic alteration has not been demonstrated until now. Additionally, genetic changes related to carcinogenesis are accompanied by other genetic and epigenetic alterations [16C17]. Thus, gene expression profiling has been used to investigate the possible mechanisms of carcinogenesis [18C19]; in most cases, these genetic profiles have been assessed via microarray technology. Gene expression analysis has identified a number of genes associated with radiation-induced thyroid tumors in sporadic tumors. Particularly, studies of post-Chernobyl tumors and post-radiotherapy thyroid tumors using human thyroid tissue have been published [20C24]. Of these reports, there are fewer published studies of post-radiotherapy tumors compared with those of post-Chernobyl tumors. Additionally, based on an cellular system, the genes identified in radiation-induced thyroid tumors were Vortioxetine hydrobromide manufacture found to be misregulated. The HTori-3 cell line is an immortalized and non-tumorigenic human primary thyroid follicular epithelial cell line transfected with the simian virus 40 genome. The resulting immortalized cell line has unique functions, such as iodide trapping and thyroglobulin production, and does not produce tumors in nude mice, despite its growth factorCindependent and anchorage-independent growth at low frequency [25]. Taking advantage of these characteristics of the HTori-3 cell line has progressed our understanding of radiation-induced thyroid carcinogenesis. For example, as a result of these features, many studies on chromosomal change, rearrangement, adverse biological effects, and selenomethionine-mediated protection against these adverse biological effects have been performed [14, 26C31]. However, gene expression profiling has only documented the alterations in gene expression caused by space radiation [29C30]; so far only the generation of rearrangements has been studied following exposure to -radiation [14]. The purpose of this study was to identify altered gene expression profiles following exposure to high doses of -radiation using the HTori-3 cell line. MATERIALS AND METHODS Cell culture HTori-3 cells, which are normal human thyroid cells, were purchased from the European Collection of Cell Cultures (ECACC, UK). The cells were suspended in medium [consisting of equal volumes Goat polyclonal to IgG (H+L)(PE) of Dulbecco’s modified Eagle’s medium (DMEM, Gibco) and Ham’s Vortioxetine hydrobromide manufacture F12 medium (Sigma) supplemented with 7% fetal bovine serum (FBS), 100 units/ml penicillin, 100 g/ml streptomycin (Gibco, USA) and 2 mM L-glutamine (Sigma)] and cultured at 37C in a humidified incubator with a mixture of 95% air and 5% CO2. TPC-1 cells, which are thyroid cancer cells that include the proto-oncogene, were obtained from Marina N. Nikiforova (Ohio State University, USA) and used as the positive control. RAW 264.7 cells, which are murine macrophage cells, were purchased from the American Type Culture Collection (ATCC) and used as the negative control. TPC-1 and RAW 264.7 cells were suspended in DMEM supplemented with 10% FBS and cultured in the same environment. Irradiation Cells were plated in T75 flasks at one day prior to irradiation. Vortioxetine hydrobromide manufacture For chronic irradiation, cells were irradiated with 5 Gy (for.

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