title: Computer modelling of radiation-induced bystander effect.
abstract: Radiation-induced genomic instability and bystander effects are now well established consequences of exposure of living cells to ionising radiation. It has been observed that cells not directly hit by radiation tracks may still exhibit radiation effects. We present a quantitative modelling of the radiation-induced bystander effect based on a diffusion model of spreading the bystander signal. The model assumes the bystander factor to be aprotein of low molecular weight, given out by the hit cell, diffusing in the medium and reacting with non-hit cells. The model calculations successfully predict the results of cell survival in an irradiated conditioned medium. The model predicts the shape of dose-effect relationship for cell survival and oncogenic transformation induced by broad-beam and micro-beam irradiation by alpha-particles.
authors.affiliation: Medical Radiological Research Centre, Obninsk, Russia.
authors.forename: Igor K
authors.initials: IK
authors.lastname: Khvostunov
authors.forename: Hooshang
authors.initials: H
authors.lastname: Nikjoo
mesh_terms: D024201:Bystander Effect / Q000502:physiology / Q000528:radiation effects*; D002470:Cell Survival / Q000528:radiation effects*; D002471:Cell Transformation, Neoplastic / Q000528:radiation effects*; D002478:Cells, Cultured; D003198:Computer Simulation; D004307:Dose-Response Relationship, Radiation; D004847:Epithelial Cells / Q000528:radiation effects; D006801:Humans; D008962:Models, Theoretical; D011829:Radiation Dosage