Contribution of indirect effects to clustered damage in DNA irradiated with protons.
Radiat Prot Dosimetry
; 166(1-4): 44-8, 2015 Sep.
Article
en En
| MEDLINE
| ID: mdl-25897140
ABSTRACT
Protons are the dominant particles both in galactic cosmic rays and in solar particle events and, furthermore, proton irradiation becomes increasingly used in tumour treatment. It is believed that complex DNA damage is the determining factor for the consequent cellular response to radiation. DNA plasmid pBR322 was irradiated at U120-M cyclotron with 30 MeV protons and treated with two Escherichia coli base excision repair enzymes. The yields of SSBs and DSBs were analysed using agarose gel electrophoresis. DNA has been irradiated in the presence of hydroxyl radical scavenger (coumarin-3-carboxylic acid) in order to distinguish between direct and indirect damage of the biological target. Pure scavenger solution was used as a probe for measurement of induced OH· radical yields. Experimental OH· radical yield kinetics was compared with predictions computed by two theoretical models-RADAMOL and Geant4-DNA. Both approaches use Geant4-DNA for description of physical stages of radiation action, and then each of them applies a distinct model for description of the pre-chemical and chemical stage.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Plásmidos
/
Protones
/
Daño del ADN
/
ADN
Tipo de estudio:
Prognostic_studies
Idioma:
En
Revista:
Radiat Prot Dosimetry
Año:
2015
Tipo del documento:
Article
País de afiliación:
República Checa