Transformation of mouse C3H/10T1/2 cells by single and fractionated doses of X-rays and fission-spectrum neutrons.
A mouse embryo-derived cell line, C3H/10T1/2, was used to measure the frequency of in vitro neoplastic transformation induced by 50-kVp X-rays and by fission-spectrum neutrons from the JANUS reactor at the Argonne National Laboratory. The transformation frequency after single X-ray doses rises exponentially, reaching a plateau at about 3 X 10(-3) transformant/survivor. The induction curve following single neutron doses, while qualitatively similar, initially rises more steeply and levels off at a maximum of about 6 X 10(-3) transformant/survivor. For both radiations, transformation frequency varies with changes in the number of viable cells per dish, showing about a 10-fold decrease in transformation frequency when the number of viable cells per 90-mm dish was increased from about 300 to about 1000. Fractionation of a total X-ray dose of 700 rads results in an approximately 6-fold increase in survival and reduction in transformation frequency over a 16-hr interval. Fractionation of the total neutron dose of 378 rads has no effect upon cell survival, and transformation frequency declines by a factor of only about 1.7 at most over a 24-hr period. Cells derived from transformed foci formed fibrosarcomas when injected into appropriately treated mice.
D000818:Animals; D002452:Cell Count; D002453:Cell Cycle / Q000528:radiation effects; D002460:Cell Line; D002470:Cell Survival / Q000528:radiation effects; D002471:Cell Transformation, Neoplastic; D004307:Dose-Response Relationship, Radiation; D005214:Fast Neutrons; D051379:Mice; D008809:Mice, Inbred C3H; D009381:Neoplasms, Radiation-Induced / Q000209:etiology; D012062:Relative Biological Effectiveness; D012513:Sarcoma, Experimental / Q000209:etiology; D014965:X-Rays