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Search: WFRF:(Edgren M)

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  • Meijer, Annelie E., et al. (author)
  • Dose and time dependent apoptotic response in a human melanoma cell line exposed to accelerated boron ions at four different LET
  • 2005
  • In: International Journal of Radiation Biology. - : Informa UK Limited. - 0955-3002 .- 1362-3095. ; 81:4, s. 261-72
  • Journal article (peer-reviewed)abstract
    • The aim was to investigate and compare the influence of linear energy transfer (LET), dose and time on the induction of apoptosis in a human melanoma cell line exposed to accelerated light boron ((10)B) ions and photons. Cells were exposed in vitro to doses up to 6 Gy accelerated boron ions (40, 80, 125 and 160 eV nm(-1)) and up to 12 Gy photons (0.2 eV nm(-1)). The induction of apoptosis was measured up to 9 days after irradiation using morphological characterization of apoptotic cells and bodies. In parallel, measurements of cell-cycle distribution, monitored by DNA flow cytometry, and cell survival based on the clonogenic cell survival assay, were performed. In addition, the induction and repair of DNA double-strand breaks (DSB), using pulsed-field gel electrophoresis (PFGE) were studied. Accelerated boron ions induced a significant increase in apoptosis as compared with photons at all time points studied. At 1-5 h the percentage of radiation-induced apoptotic cells increased with both dose and LET. At the later time points (24-216 h) the apoptotic response was more complex and did not increase in a strictly LET-dependent manner. The early premitotic apoptotic cells disappeared at 24 h following exposure to the highest LET (160 eV nm(-1)). A postmitotic apoptotic response was seen after release of the dose-, time- and LET-dependent G2/M accumulations. The loss of clonogenic ability was dose- and LET-dependent and the fraction of un-rejoined DSB increased with increasing LET. Despite the LET-dependent clonogenic cell killing, it was not possible to measure quantitatively a LET-dependent apoptotic response. This was due to the different time course of appearance and disappearance of apoptotic cells.
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  • Result 1-10 of 124
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journal article (96)
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peer-reviewed (89)
other academic/artistic (34)
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Edgren, G (69)
Edgren, M. (31)
Hjalgrim, H (27)
Nilsson, S. (19)
Nyren, O (18)
Melbye, M (17)
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Reilly, M (14)
Lennernäs, Bo, 1963 (9)
Hartman, M (7)
Kalkner, KM (6)
Wikman, A (6)
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