Neutral filter elution detects only limited inhibition of double-strand break repair by 9-beta-D-arabinofuranosyladenine.
Bradley and Kohn (1979) showed that the neutral filter elution technique detects DNA double-strand breaks (dsb), yet there is still some uncertainty regarding the interpretation of results obtained with this technique (viz. the curvilinear dose-response curve and the rapid repair kinetics). In this report we have investigated the effect of the nucleoside analogue 9-beta-D-arabinofuranosyladenine (ara A), a known inhibitor of dsb repair, on the DNA repair in X-irradiated Ehrlich ascites tumour cells as measured by this technique. We have compared the effect of ara A on repair in these cells with results previously obtained with the same cell line and using the neutral velocity sedimentation and DNA unwinding techniques (Blöcher, 1982; Bryant and Blöcher, 1982). Our results suggest that the lesions measured by the neutral elution technique are different from those measured by neutral velocity sedimentation or long-term repair measured by DNA unwinding.
Costa
N D
ND
Department of Biology and Preclinical Medicine, University of St. Andrews, Scotland, Great Britain.
Bryant
P E
PE
D000818:Animals; D002286:Carcinoma, Ehrlich Tumor; D004247:DNA / Q000187:drug effects*; D004260:DNA Repair; D004307:Dose-Response Relationship, Radiation; D007700:Kinetics; D008851:Micropore Filters; D009154:Mutation; D014407:Tumor Cells, Cultured; D014466:Ultraviolet Rays; D014740:Vidarabine / Q000494:pharmacology*
D004247:DNA; D014740:Vidarabine