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  • Title: Is the NAD-poly (ADP-ribose) polymerase system the trigger in radiation-induced death of mouse thymocytes?
    Author: Denisenko MF, Soldatenkov VA, Belovskaya LN, Filippovich IV.
    Journal: Int J Radiat Biol; 1989 Sep; 56(3):277-85. PubMed ID: 2570813.
    Abstract:
    Agents that induce DNA strand breaks evoke a drop in the NAD content in mouse thymocytes. A decrease in the endogenous NAD content that occurs immediately after gamma-irradiation of thymocytes is entirely attributed to the activation of poly(ADP-ribosylation). The addition of 5 mM benzamide before irradiation prevents the postirradiation drop of the NAD level but has no effect on chromatin degradation and cell death. In contrast to liver nuclei, pre-incubation of mouse thymic nuclei with NAD had no effect on the subsequent chromatin endonucleolysis by Ca2+/Mg2+-dependent endonuclease. It is suggested that the NAD-poly(ADP-ribose) polymerase system is probably not the trigger in the radiation-induced programmed death of mouse thymocytes, but may merely be indicative of the radiation response of these cells.
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