PMID: 8947533Nov 1, 1996Paper

Dose-rate sparing for micronucleus induction in lymphocytes of controls and ataxia-telangiectasia heterozygotes exposed to 60Co gamma-irradiation in vitro

International Journal of Radiation Biology
D ScottS A Roberts

Abstract

We investigated the reproducibility of the cytochalasin B micronucleus (MN) assay in irradiated human lymphocytes to assess its suitability in predicting cancer predisposition and response to radiotherapy by virtue of defects in the processing of clastogenic lesions. G0 lymphocytes were exposed to 3.0 Gy 60Co gamma-rays at high (HDR) or low dose-rate (LDR). Six healthy donors were assayed three times each in nine experiments and compared with six ataxia-telangiectasia (A-T) heterozygotes. In controls, significant interexperiment variability in MN yields was observed at HDR and LDR, also in dose-rate sparing (i.e. reduction in MN yield at LDR compared with HDR). Significant inter-individual variability was seen at HDR, but not at LDR or for sparing. Average sparing was 66.4 +/- 4.8%. In spite of the experimental variability, a significant difference between controls and A-T heterozygotes was detected at LDR, and 5/6 heterozygotes had sparing values below the control range. This gives encouragement for the use of this assay in predictive testing if sources of experimental variability can be identified so as to improve discrimination between individuals. HDR and to a lesser extent LDR irradiation induced significant mitotic inhibi...Continue Reading

References

Dec 1, 1993·Mutation Research·I VorechovskýD A Webster
Nov 19, 1994·Lancet·D ScottS A Roberts
Jun 15, 1993·Proceedings of the National Academy of Sciences of the United States of America·J M Lee, A Bernstein

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Citations

Jan 23, 2016·Radiation and Environmental Biophysics·Antonella BertucciDavid J Brenner
Jan 7, 1998·International Journal of Radiation Biology·D Słonina, A Gasińska
Dec 18, 2010·Mutagenesis·Lucia MigliorePhilip Thomas
Apr 22, 2004·Genes, Chromosomes & Cancer·Sara Gutiérrez-EnríquezJanet Hall
Sep 27, 2019·Frontiers in Oncology·Lorena GiurannoMarc A Vooijs
Sep 8, 2005·Clinical Cancer Research : an Official Journal of the American Association for Cancer Research·Carl N SprungMichael J McKay
Feb 15, 2001·International Journal of Radiation Oncology, Biology, Physics·R P HillM S Anscher

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