Exposure of human lymphocytes to ionizing radiation reduces mutagenesis by subsequent ionizing radiation

B. J.S. Sanderson, A. A. Morley

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    119 Citations (Scopus)

    Abstract

    The effect of prior incubation with [3H]thymidine on survival and mutagenesis after X-irradiation of human lymphocytes was studied by incubating lymphocytes with 0.001-1.0 μCi/ml [3H]thymidine for 6 h at 37° C and then irradiating with 150 or 300 rad. Survival was measured using lymphocyte cloning and mutagenesis was measured using 6-thioguanine selection to detect clones mutated at the hypoxanthine phosphoribosyltransferase locus. [3H]Thymidine alone had no effect on survival or mutagenesis and X-radiation alone produced the expected decrease in survival and increase in mutations. [3H]Thymidine prior to X-radiation had no effect on lethality of X-radiation but at concentrations of 0.1 and 1.0 μCi/ml produced a significant decrease in the number of mutations induced after both 150 and 300 rad. The results suggest that ionizing radiation, produced by disintegration of 3H, reduces the mutagenic effect of a subsequent exposure to ionizing radiation by induction of a system which prevents or repairs a restricted class of radiation damage.

    Original languageEnglish
    Pages (from-to)347-351
    Number of pages5
    JournalMutation Research/Environmental Mutagenesis and Related Subjects
    Volume164
    Issue number6
    DOIs
    Publication statusPublished - Dec 1986

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