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Title: Low-Dose Hyper-Radiosensitivity Is Not a Common Effect in Normal Asynchronous and G2-Phase Fibroblasts of Cancer Patients

Purpose: In our previous study, using the micronucleus assay, a low-dose hyper-radiosensitivity (HRS)-like phenomenon was observed for normal fibroblasts of 2 of the 40 cancer patients investigated. In this article we report, for the first time, the survival response of primary fibroblasts from 25 of these patients to low-dose irradiation and answer the question regarding the effect of G2-phase enrichment on HRS elicitation. Methods and Materials: The clonogenic survival of asynchronous as well as G2-phase enriched fibroblast populations was measured. Separation of G2-phase cells and precise cell counting was performed using a fluorescence-activated cell sorter. Sorted and plated cells were irradiated with single doses (0.1-4 Gy) of 6-MV x-rays. For each patient, at least 4 independent experiments were performed, and the induced-repair model was fitted over the whole data set to confirm the presence of HRS effect. Results: The HRS response was demonstrated for the asynchronous and G2-phase enriched cell populations of 4 patients. For the rest of patients, HRS was not defined in either of the 2 fibroblast populations. Thus, G2-phase enrichment had no effect on HRS elicitation. Conclusions: The fact that low-dose hyper-radiosensitivity is not a common effect in normal human fibroblasts implies that HRS may be ofmore » little consequence in late-responding connective tissues with regard to radiation fibrosis.« less
Authors:
 [1] ; ;  [1] ;  [2] ;  [3] ;  [1]
  1. Department of Applied Radiobiology, Centre of Oncology, Maria-Skłodowska-Curie Memorial Institute Kraków, Kraków (Poland)
  2. Department of Medical Physics, Centre of Oncology, Maria-Skłodowska-Curie Memorial Institute Kraków, Kraków (Poland)
  3. Jagiellonian Centre for Experimental Therapeutics (JCET), Jagiellonian University, Kraków (Poland)
Publication Date:
OSTI Identifier:
22283353
Resource Type:
Journal Article
Resource Relation:
Journal Name: International Journal of Radiation Oncology, Biology and Physics; Journal Volume: 88; Journal Issue: 2; Other Information: Copyright (c) 2014 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
62 RADIOLOGY AND NUCLEAR MEDICINE; FIBROBLASTS; FIBROSIS; FLUORESCENCE; LOW DOSE IRRADIATION; NEOPLASMS; PATIENTS; RADIOSENSITIVITY