Inter-individual differences in radiation response shown by an in vitro micronucleus assay: effects of 3-aminobenzamide on X-ray treatment.
Among the methods of biological dosimetry of ionizing radiation, we propose the cytokinesis-block micronucleus assay for the measurement of the individual dose absorbed. The dose-response curve was determined for in vitro-irradiated lymphocytes from 25 individuals. The dose-response relationship, fitted by the linear-quadratic function, was F(MN) = 0.015 (+/- 0.0016) + 0.043 (+/- 0.0075).D + 0.083 (+/- 0.0045).D2. Our results are compared with those of other authors. 3-aminobenzamide (3AB) combined with X-rays were used to evaluate the micronucleus dose-response relationship in blood from 14 individuals. While it is known that 3AB inhibits poly(ADP-ribose) polymerase activity in vitro, we demonstrate that it also increases the X-ray-induced micronucleus yields. The resulting dose-response relationship varies from subject to subject. The possibility of using this approach to identify the individual radiosensitivity level is discussed.
Division of Toxicology, ENEA CRE Casaccia, Rome, Italy.
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D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D001549:Benzamides / Q000494:pharmacology; D004307:Dose-Response Relationship, Radiation; D006801:Humans; D008214:Lymphocytes / Q000187:drug effects / Q000528:radiation effects*; D015162:Micronucleus Tests; D008875:Middle Aged; D000067856:Poly(ADP-ribose) Polymerase Inhibitors
D001549:Benzamides; D000067856:Poly(ADP-ribose) Polymerase Inhibitors; C025160:3-aminobenzamide