title: Cell cycle-dependent potentiation of X-ray-induced chromosomal aberrations by 3-aminobenzamide.
abstract: The poly(ADP-ribose) polymerase inhibitor 3-aminobenzamide had dramatically different effects on X-ray-induced cytogenetic damage in human lymphocytes depending on the stage of the cell cycle in which cells were irradiated. 3-Aminobenzamide (0.08-3.00 mM) potentiated the frequency of chromosomal aberrations when lymphocytes were irradiated in G1, S, or late G2. No effect was observed, however, when lymphocytes were irradiated in G0 or at the S/G2 boundary 6 h before termination of culture. These results indicate that poly(ADP-ribose) polymerase may be involved in chromosomal repair of radiation damage only during specific stages of the cell cycle.
mesh_terms: D001549:Benzamides / Q000633:toxicity*; D002453:Cell Cycle / Q000187:drug effects / Q000528:radiation effects; D002478:Cells, Cultured; D002869:Chromosome Aberrations; D002877:Chromosomes, Human / Q000187:drug effects / Q000528:radiation effects*; D006801:Humans; D008214:Lymphocytes / Q000166:cytology / Q000187:drug effects / Q000528:radiation effects*; D000067856:Poly(ADP-ribose) Polymerase Inhibitors
chemical_list: D001549:Benzamides; D000067856:Poly(ADP-ribose) Polymerase Inhibitors; C025160:3-aminobenzamide