PMID: 9525261Apr 3, 1998Paper

Trans-dominant inhibition of poly(ADP-ribosyl)ation leads to decreased recovery from ionizing radiation-induced cell killing

International Journal of Radiation Biology
V RudatK J Weber

Abstract

Poly(ADP-ribosyl)ation is a post-translational modification of nuclear proteins catalysed by poly(ADP-ribose)polymerase (PARP). PARP is strongly activated by DNA strand breaks and is thought to be involved in DNA repair, and various chemical agents that inhibit poly(ADP-ribosyl)ation have radiosensitizing properties. An alternative, highly specific (trans-dominant) inhibition of PARP function has been made possible with a molecular genetic approach where CO60 hamster cells were transfected with the PARP DNA-binding domain (DBD) under the control of a Dexamethasone (Dex)-inducible promoter. Stable transfectants were incubated with or without Dex and the impact of poly(ADP-ribosyl)ation on cellular radiation response (clonogenic survival) was measured following irradiation at high or low dose-rate or when potentially lethal damage (PLD) recovery was allowed. For acute exposures the radiosensitizing effect of PARP inhibition could be confirmed and a large enhancement ratio (calculated from the respective mean inactivation doses) of 2.2 was found for plateau phase cells. Both cellular recovery phenomena (dose-rate sparing and PLD) were decreased in the presence of Dex, and particularly PLD-recovery was nearly completely abolished d...Continue Reading

Citations

Mar 29, 2000·Neuropathology and Applied Neurobiology·S LoveG K Wilcock
May 15, 2002·Radiation Research·I HoflandC Vens
May 3, 2005·Nature Reviews. Drug Discovery·Prakash Jagtap, Csaba Szabó
Jan 19, 2019·International Journal of Radiation Biology·John E Moulder
Jan 5, 2002·Thyroid : Official Journal of the American Thyroid Association·M Agote Pisarev

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