title: Strategy for selection of cell variants deficient in poly(ADP-ribose) polymerase.
abstract: A selection strategy to obtain cells deficient in poly(ADP-ribose) polymerase was developed based on the fact that treatment with high levels of N-methyl-N'-nitro-N-nitrosoguanidine results in sufficient activation of poly(ADP-ribose) polymerase to cause NAD and ATP depletion leading to cessation of all energy-dependent processes and rapid cell death. In contrast, cells with low levels of poly(ADP-ribose) polymerase should not consume their NAD and might therefore be more likely to survive the DNA damage. Using this approach, we have cloned a number of cell lines containing 37-82% enzyme activity. The apparent decrease in poly(ADP-ribose) polymerase activity is not due to increases in NAD glycohydrolase, poly(ADP-ribose) glycohydrolase, or phosphodiesterase activities. Further characterization of the poly(ADP-ribose) polymerase-deficient cells indicates that they have prolonged generation times and increased rates of spontaneous sister chromatid exchanges.
mesh_terms: D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D002460:Cell Line; D002469:Cell Separation / Q000379:methods*; D002470:Cell Survival; D006224:Cricetinae; D003412:Cricetulus; D004789:Enzyme Activation / Q000187:drug effects; D005347:Fibroblasts / Q000187:drug effects / Q000201:enzymology*; D008168:Lung; D008297:Male; D008769:Methylnitronitrosoguanidine / Q000494:pharmacology; D009243:NAD / Q000378:metabolism; D011065:Poly(ADP-ribose) Polymerases / Q000172:deficiency*
chemical_list: D009243:NAD; D008769:Methylnitronitrosoguanidine; D000255:Adenosine Triphosphate; D011065:Poly(ADP-ribose) Polymerases