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  • Title: [Thermoinduced radioresistance of Escherichia coli cells and heat shock proteins].
    Author: Verbenko VN, Akhmedov AT, Kalinin VL.
    Journal: Radiobiologiia; 1986; 26(4):453-9. PubMed ID: 3529221.
    Abstract:
    Radioresistance of E. coli cells is slightly increased (dose modification factor (DMF) = 1.2) with temperature elevated from 4 degrees to 43 degrees C at the time of gamma-irradiation. However, an appreciable effect of the thermoinduced radioresistance (DMF = 1.7) was observed when the wild-type cells were exposed to gamma-radiation at 15-43 degrees C (but not at 4 degrees C) after 30-min preincubation at 43 degrees C. This effect was absent in htpR mutants, defective in induction of heat shock proteins, and coupled with the decreased post-irradiation DNA degradation in gamma-irradiated htpR+ cells. It is suggested that heat shock proteins are involved in the thermoinduced radioresistance.
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