title: Residual chromatin breaks as biodosimetry for cell killing by carbon ions.
abstract: We have studied the relationship between cell killing and the induction of residual chromatin breaks on various human cell lines and primary cultured cells obtained by biopsy from patients irradiated with either X-rays or heavy-ion beams to identify potential bio-marker of radiosensitivity for radiation-induced cell killing. The carbon-ion beams were accelerated with the Heavy Ion Medical Accelerator in Chiba (HIMAC). Six primary cultures obtained by biopsy from 6 patients with carcinoma of the cervix were irradiated with two different mono-LET beams (LET = 13 keV/micrometer, 76 keV/micrometer) and 200kV X rays. Residual chromatin breaks were measured by counting the number of non-rejoining chromatin fragments detected by the premature chromosome condensation (PCC) technique after a 24 hour post-irradiation incubation period. The induction rate of residual chromatin breaks per cell per Gy was the highest for 76 keV/micrometer beams on all of the cells. Our results indicated that cell which was more sensitive to the cell killing was similarly more susceptible to induction of residual chromatin breaks. Furthermore there is a good correlation between these two end points in various cell lines and primary cultured cells. This suggests that the detection of residual chromatin breaks by the PCC technique may be useful as a predictive assay of tumor response to cancer radiotherapy.
authors.affiliation: Space and Particle Radiation Science Research Group, National Institute of Radiological Sciences, Chiba-shi, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Suzuki
authors.forename: Y
authors.initials: Y
authors.lastname: Kase
authors.forename: T
authors.initials: T
authors.lastname: Nakano
authors.forename: T
authors.initials: T
authors.lastname: Kanai
authors.forename: K
authors.initials: K
authors.lastname: Ando
mesh_terms: D015415:Biomarkers; D002247:Carbon Isotopes; D002470:Cell Survival / Q000528:radiation effects; D002843:Chromatin / Q000528:radiation effects*; D019457:Chromosome Breakage; D004307:Dose-Response Relationship, Radiation; D005260:Female; D020450:Heavy Ions; D006801:Humans; D018499:Linear Energy Transfer; D010315:Particle Accelerators; D011834:Radiation Monitoring / Q000379:methods*; D011836:Radiation Tolerance; D014407:Tumor Cells, Cultured / Q000528:radiation effects; D002583:Uterine Cervical Neoplasms / Q000532:radiotherapy; D014965:X-Rays
chemical_list: D015415:Biomarkers; D002247:Carbon Isotopes; D002843:Chromatin