title: Keeping up with the neighbours--measuring the bystander response.
abstract: Ionising radiation can induce responses within non-exposed neighbouring (bystander) cells, which potentially have important implications on the estimates of risk at environmentally relevant doses. Using human skin fibroblasts (AG1522), a range of methods were used to investigate the nature of the signal(s) arising from the exposed cells. The signal(s) can be transmitted by direct cell-cell communication (investigated by using partial dish irradiations) or by medium-borne factors (a co-culture system where two monolayers share the same medium but only one monolayer is exposed to ionising radiation). CDKN1A was found to be up-regulated in both directly exposed and non-exposed cells. The data suggest that direct cell-cell communication dominates for these confluent cells, with medium-borne factors also contributing.
authors.affiliation: MRC Radiation & Genome Instability Unit, Harwell, Oxfordshire OX11 0RD, UK. e.pyke@har.mrc.ac.uk
authors.forename: E L
authors.initials: EL
authors.lastname: Pyke
authors.forename: D L
authors.initials: DL
authors.lastname: Stevens
authors.forename: M A
authors.initials: MA
authors.lastname: Hill
mesh_terms: D024201:Bystander Effect / Q000502:physiology* / Q000528:radiation effects*; D002460:Cell Line; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000378:metabolism*; D004247:DNA / Q000235:genetics / Q000528:radiation effects; D004249:DNA Damage; D004307:Dose-Response Relationship, Radiation; D004789:Enzyme Activation / Q000528:radiation effects; D005347:Fibroblasts / Q000502:physiology* / Q000528:radiation effects*; D006801:Humans; D011829:Radiation Dosage; D011836:Radiation Tolerance / Q000502:physiology / Q000528:radiation effects
chemical_list: C493956:CDKN1A protein, human; D050759:Cyclin-Dependent Kinase Inhibitor p21; D004247:DNA