Different effects of 5-fluorodeoxyuridine and 5-bromodeoxuridine on the frequencies of chromatid aberrations obtained in vicia faba after irradiation with X-rays

Synergistic Effect of 5-Bromodeoxyuridine and Gamma Rays on Chromosomes

The combined effect of 5-bromodeoxyuridine and gamma rays on chromosomes in cells from the root tips of Zebrina pendula is synergistic. The enhanced, combined effects per cell of aberrations, bridges, and acentric fragments were, respectively, 2, 2.4, and 1.9 times the sum of the separate effects.

X-ray sensitivity and DNA synthesis in synchronous populations of HeLa cells

Inhibition with either 5-fluorodeoxyuridine or deoxyadenosine for specified periods during the division cycle of the HeLa S3 cell shows that the mid-interphase peak in sensitivity occurs just before DNA replication begins. Sensitivity subsequently decreases only after synthesis of DNA is resumed. One interpretation of the relation between fluctuations in sensitivity and in DNA synthesis is that the lethal radiation damage to these cells occurs in DNA.