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  • Title: Non-linear dose-effect curve for DNA double-strand breaks by low LET radiation: the effect of eluting buffer composition on the measurement of breaks by the filter elution technique.
    Author: Prise KM, Davies S, Michael BD.
    Journal: Int J Radiat Biol; 1989 Dec; 56(6):943-50. PubMed ID: 2574222.
    Abstract:
    Chinese hamster V79 cells were irradiated with 250 kVp X-rays and analysed for the presence of DNA double-strand breaks using filter elution. Changing the pH of the elution and lysis buffers from pH 9.6 to 7.2 leads to a decreased rate of elution of the DNA from the filters and a small difference in the dose-effect relationship obtained. In both cases the dose-effect curves were non-linear. When cells are irradiated with 238Pu alpha-particles a difference in the rate of elution of the DNA is also observed between the two pH values, although the dose-effect curves are linear. These findings suggest that there may be qualitative differences in the types of lesions being induced by low-LET radiation and being scored as dsb in the filter elution assay at pH 9.6. However, carrying out elution at pH 7.2 does not eliminate the nonlinear response measured after X-irradiation.
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