PMID: 3319923Dec 1, 1987Paper

Radiation sensitization of E. coli B/r by mixtures of oxygen and nitrous oxide

International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine
D Ewing

Abstract

Oxygen (O2) sensitizes bacterial cells in at least two mechanistically different ways, depending on the specific O2 concentration present during irradiation. Based on previous work from this laboratory, it has been proposed that nitrous oxide (N2O) and low concentrations of O2 share a common mechanism for damage. This mechanism, involving the production of superoxide anion radicals (O2-), is different from that which causes damage at high O2 concentrations. Others, however, have presented evidence that N2O and O2 (usually tested only at high concentrations) act in different ways to sensitize bacterial cells. We have now measured the radiation sensitivity in mixtures of N2O and O2 to observe additivity patterns and to determine if these two agents have any common processes for sensitization. We found that some low O2 concentrations do not increase the response in N2O, although they can have significant sensitizing effects in N2. This lack of additivity is taken as evidence for a common mechanism of damage from N2O and low concentrations of O2. In contrast, damage from high concentrations of O2 is additive to the damage from N2O. The greatest sensitivity, observed with a gas mixture of about 15 per cent O2/85 per cent N2O, is equ...Continue Reading

References

Apr 1, 1987·Archives of Biochemistry and Biophysics·D Ewing, S R Jones
Sep 1, 1972·International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine·E L PowersM Simic
Aug 1, 1982·International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine·D Ewing
May 1, 1983·International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine·D Ewing
Jan 1, 1983·International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine·H WatanabeH Iizuka
Feb 1, 1982·International Journal of Radiation Biology and Related Studies in Physics, Chemistry, and Medicine·D Ewing

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Citations

Aug 26, 1998·American Journal of Clinical Oncology·D Ewing

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