Induction of strand breaks in DNA films by low energy electrons and soft X-ray under nitrous oxide atmosphere

Five-monolayer (5 ML) plasmid DNA films deposited on glass and tantalum substrates were exposed to Al K-alpha X-rays of 1.5 key under gaseous nitrous oxide (N2O) at atmospheric pressure and temperature. Whereas the damage yields for DNA deposited on glass are due to soft X-rays, those arising from DNA on tantalum are due to both the interaction of low energy photoelectrons from the metal and X-rays. Then, the differences in the yields of damage on glass and tantalum substrates, essentially arises from interaction of essentially low-energy electrons (LEEs) with DNA molecules and the surrounding atmosphere. The G-values (i.e., the number of moles of product per Joule of energy absorbed) for DNA strand breaks induced by LEEs (G(LEE)) and the lower limit of G-values for soft X-ray photons (G(XL)) were calculated and the results compared to those from previous studies under atmospheric conditions and other ambient gases, such as N-2 and O-2. Under N2O, the G-values for loss of supercoiled DNA are 103 +/- 15 nmol/J for X-rays, and 737 +/- 110 nmol/J for LEEs. Compared to corresponding values in an O-2 atmosphere, the effectiveness of X-rays to damage DNA in N2O is less, but the G value for LEEs in N2O is more than twice the corresponding value for an oxygenated environment. This result indicates a higher effectiveness for LEEs relative to N-2 and O-2 environments in causing SSB and DSB in an N2O environment. Thus, the previously observed radiosensitization of cells by N2O may not be only due to OH center dot radicals but also to the reaction of LEE with N2O molecules near DNA. The previous experiments with N-2 and O-2 and the present one demonstrate the possibility to investigate damage induced by LEEs to biomolecules under various types of surrounding atmospheres. (C) 2011 Elsevier Ltd. All rights reserved.