Changes in G1-phase populations in human glioblastoma and neuroblastoma cell lines influence p(66)/Be neutron-induced micronucleus yield

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dc.contributor.authorAkudugu J.M.
dc.contributor.authorBinder A.
dc.contributor.authorSerafin A.
dc.contributor.authorSlabbert J.
dc.contributor.authorGiese A.
dc.contributor.authorBohm L.
dc.date.accessioned2011-05-15T16:17:19Z
dc.date.available2011-05-15T16:17:19Z
dc.date.issued2004
dc.description.abstractSome photon resistant tumours are sensitive to neutrons but no predictive methods exist which could identify such tumours. In a recent study addressing this clinically important issue, we demonstrated that relative biologic effectiveness (RBE) values for p(66)/Be neutrons estimated from micronucleus (MN) data correlate positively with RBE values obtained from conventional clonogenic survival data. However, not all photon-resistant cell lines showed high RBE values when the MN endpoint was used. Now, we examine how the functional status of the p53 tumour suppressor gene and radiation-induced changes in cell cycle phase populations may contribute to this discrepancy. No significant association was established between p53 status and MN yield for both photon and neutron irradiation. The data demonstrated that neutron-, but not photon-, induced MN yield is dependent on the intrinsic ability of cells to activate a G1-phase arrest. In cell lines of comparable photon sensitivity, those showing more extensive depletion of the G1 population express significantly more micronuclei per unit dose of neutrons. These results suggest that differences in cell cycle kinetics, and not the p53 status, may constitute an important factor in damage induction by high linear energy transfer (LET) irradiation and need to be considered when radiation toxicity in clinical radiobiology or radiation protection is assessed using damage endpoints. © 2004 Elsevier Inc. All rights reserved.
dc.description.versionArticle
dc.identifier.citationLife Sciences
dc.identifier.citation75
dc.identifier.citation5
dc.identifier.issn00243205
dc.identifier.other10.1016/S0024-3205(04)00285-1
dc.identifier.urihttp://hdl.handle.net/10019.1/14166
dc.subjectarticle
dc.subjectcell cycle G1 phase
dc.subjectcell population
dc.subjectcontrolled study
dc.subjectenergy transfer
dc.subjectglioblastoma
dc.subjecthuman
dc.subjecthuman cell
dc.subjectlight
dc.subjectmicronucleus
dc.subjectneuroblastoma
dc.subjectneutron
dc.subjectneutron radiation
dc.subjectradiation
dc.subjectradiosensitivity
dc.subjectstatistical significance
dc.subjectBeryllium
dc.subjectCell Line, Tumor
dc.subjectCell Survival
dc.subjectFlow Cytometry
dc.subjectG1 Phase
dc.subjectGlioblastoma
dc.subjectHumans
dc.subjectLinear Energy Transfer
dc.subjectMicronuclei, Chromosome-Defective
dc.subjectMicronucleus Tests
dc.subjectNeuroblastoma
dc.subjectNeutrons
dc.subjectPhotons
dc.subjectRadiation Tolerance
dc.subjectTime Factors
dc.titleChanges in G1-phase populations in human glioblastoma and neuroblastoma cell lines influence p(66)/Be neutron-induced micronucleus yield
dc.typeArticle
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