Cellular response on Auger- and Beta-emitting nuclides: Human embryonic stem cells (hESC) vs. keratinocytes
Autor: | Ekkehard Pomplun, Jürgen Hescheler, Johannes Winkler, Alexander Dellweg, Harald Schicha, Stefan Arnhold, Hans-Dieter Royer, Ralf Kriehuber, F. Sudbrock, Klaus Schomäcker, Matthias Matzkies, Markus Dietlein, Thomas Fischer |
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Rok vydání: | 2012 |
Předmět: |
Keratinocytes
Transcription Genetic Somatic cell Apoptosis DNA Fragmentation Biology Cell morphology Cell Line law.invention Iodine Radioisotopes law Gene expression Humans DNA Breaks Double-Stranded Radiology Nuclear Medicine and imaging DNA Breaks Single-Stranded Embryonic Stem Cells Radiological and Ultrasound Technology Dose-Response Relationship Radiation Deoxyuridine Molecular biology Embryonic stem cell Cell biology HaCaT Stem cell Electron microscope Transcriptome |
Zdroj: | International Journal of Radiation Biology. 88:961-971 |
ISSN: | 1362-3095 0955-3002 |
DOI: | 10.3109/09553002.2012.683510 |
Popis: | We studied the response of human embryonic stem cells (hESC) to the β-emitter (131)I, which affects the entire cell and to the Auger electron emitter (125)I-deoxyuridine ((125)I-dU), primarily affecting the deoxyribonuleic acid (DNA). The effects were also studied in keratinocytes as a prototype for somatic cells.HESC (H1) and human keratinocytes (HaCaT, human) were exposed to (125)I-dU (5 × 10(-5) - 5 MBq/ml) and (131)I-iodide (5 × 10(-5) - 12.5 MBq/ml) and apoptosis was measured by DNA-fragmentation. Cell morphology was studied by light microscopy and electron microscopy. Transcriptional profiling was done on the Agilent oligonucleotide microarray platform.Auger-process induced no apoptosis but a strong transcriptional response in hESC. In contrast, HaCaT cells showed a pronounced induction of apoptosis but only a moderate transcriptional response. Transcriptional response of hESC was similar after (125)I-dU and (131)I treatments, whereas HaCaT cells expressed a much more pronounced response to (125)I-dU than to (131)I. A striking radiation-induced down-regulation of pluripotency genes was observed in hESC whereas in keratinocytes the enriched gene annotations were related primarily to apoptosis, cell division and proliferation.Human embryonic stem cells respond to ionizing radiation by (125)I-dU and (131)I in a different way compared to keratinocytes. Transcriptional response and gene expression appear to facilitate an escape from programmed cell death by striking a new path which probably leads to cell differentiation. |
Databáze: | OpenAIRE |
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