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125I-UDR induced division delay

M H Schneiderman, B F Kimler, A S Kirschner

    Biophysical Journal
    |February 1, 1977
    PubMed
    Summary
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    Radioactivity from tritium (3H) and iodine (125I) incorporated into DNA delays S-phase progression in Chinese hamster ovary (CHO) cells. G2-phase cells were unaffected by the incorporated isotopes.

    Area of Science:

    • Cell Biology
    • Radiobiology
    • Molecular Biology

    Background:

    • Understanding how DNA-incorporated radioisotopes affect cell cycle progression is crucial for radiation biology and dosimetry.
    • Chinese hamster ovary (CHO) cells are a standard model for radiobiological studies due to their well-characterized cell cycle and sensitivity to radiation.

    Purpose of the Study:

    • To investigate the impact of incorporated tritium (3H) and iodine-125 (125I) on the cell cycle progression of CHO cells.
    • To determine if DNA-incorporated radioisotopes cause cell cycle delays in specific phases.

    Main Methods:

    • Mitotic selection was employed to synchronize CHO cells for precise cell cycle analysis.
    • Radioisotopes 3H and 125I were incorporated into the DNA of CHO cells.
    • Cell cycle distribution was analyzed to assess the effects of incorporated radioactivity.

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    Main Results:

    • Cells in the S-phase of the cell cycle exhibited a significant delay in progression.
    • Cells in the G2-phase did not show a delay in cell cycle progression.
    • The presence of incorporated 3H and 125I within the DNA directly impacted cell cycle kinetics.

    Conclusions:

    • DNA-incorporated 3H and 125I induce specific delays in S-phase progression in CHO cells.
    • The cell cycle effects are phase-specific, with G2 cells being less sensitive to these incorporated radioisotopes.
    • These findings contribute to understanding the radiobiological effects of low-energy beta and Auger-electron-emitting isotopes.