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

2.50
Hdl Handle:
http://hdl.handle.net/10541/95804
Title:
Dose-rate sparing for micronucleus induction in lymphocytes of controls and ataxia-telangiectasia heterozygotes exposed to 60Co gamma-irradiation in vitro.
Authors:
Scott, David; Hu, Qiuping; Roberts, Stephen A
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 inhibition, seen as a reduction in binucleate cells after cytocholasin treatment. A positive correlation between mitotic inhibition and MN frequency suggests that similar lesions may be involved in these effects.
Affiliation:
Paterson Institute for Cancer Research, Christie CRC Research Centre, Manchester, UK.
Citation:
Dose-rate sparing for micronucleus induction in lymphocytes of controls and ataxia-telangiectasia heterozygotes exposed to 60Co gamma-irradiation in vitro. 1996, 70 (5):521-7 Int. J. Radiat. Biol.
Journal:
International Journal of Radiation Biology
Issue Date:
Nov-1996
URI:
http://hdl.handle.net/10541/95804
DOI:
10.1080/095530096144725
PubMed ID:
8947533
Type:
Article
Language:
en
ISSN:
0955-3002
Appears in Collections:
All Paterson Institute for Cancer Research

Full metadata record

DC FieldValue Language
dc.contributor.authorScott, Daviden
dc.contributor.authorHu, Qiupingen
dc.contributor.authorRoberts, Stephen Aen
dc.date.accessioned2010-04-07T08:31:26Z-
dc.date.available2010-04-07T08:31:26Z-
dc.date.issued1996-11-
dc.identifier.citationDose-rate sparing for micronucleus induction in lymphocytes of controls and ataxia-telangiectasia heterozygotes exposed to 60Co gamma-irradiation in vitro. 1996, 70 (5):521-7 Int. J. Radiat. Biol.en
dc.identifier.issn0955-3002-
dc.identifier.pmid8947533-
dc.identifier.doi10.1080/095530096144725-
dc.identifier.urihttp://hdl.handle.net/10541/95804-
dc.description.abstractWe 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 inhibition, seen as a reduction in binucleate cells after cytocholasin treatment. A positive correlation between mitotic inhibition and MN frequency suggests that similar lesions may be involved in these effects.en
dc.language.isoenen
dc.subject.meshAdult-
dc.subject.meshAnalysis of Variance-
dc.subject.meshAtaxia Telangiectasia-
dc.subject.meshCobalt Radioisotopes-
dc.subject.meshCytochalasin B-
dc.subject.meshGamma Rays-
dc.subject.meshHeterozygote-
dc.subject.meshHumans-
dc.subject.meshLymphocytes-
dc.subject.meshMale-
dc.subject.meshMicronuclei, Chromosome-Defective-
dc.subject.meshMicronucleus Tests-
dc.subject.meshMiddle Aged-
dc.subject.meshMitosis-
dc.subject.meshRadiation Dosage-
dc.subject.meshReproducibility of Results-
dc.titleDose-rate sparing for micronucleus induction in lymphocytes of controls and ataxia-telangiectasia heterozygotes exposed to 60Co gamma-irradiation in vitro.en
dc.typeArticleen
dc.contributor.departmentPaterson Institute for Cancer Research, Christie CRC Research Centre, Manchester, UK.en
dc.identifier.journalInternational Journal of Radiation Biologyen

Related articles on PubMed

All Items in Christie are protected by copyright, with all rights reserved, unless otherwise indicated.