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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.
Dicentric chromosomes and γ-H2AX foci formation in lymphocytes of human blood samples exposed to a CT scanner: A direct comparison of dose response relationships.
Radiat. Prot. Dosim. 134, 55-61 (2009)
Experiments using the induction of dicentric chromosomes (dicentrics) as well as the gamma-H2AX foci formation in lymphocytes of blood samples from a healthy donor were performed to directly evaluate the radiation sensitivity of both biological endpoints. For computed tomography scans at dose levels from 0.025 to 1 Gy, a linear-quadratic dose-response relationship for dicentrics and a linear dose-response relationship for gamma-H2AX foci were obtained. The coefficients of the dose-response relationship for dicentrics are alpha = (3.76 +/- 0.29) x 10(-2) Gy(-1) and beta = (5.54 +/- 0.45) x 10(-2) Gy(-2), the linear coefficient for gamma-H2AX foci is (7.38 +/- 0.11) Gy(-1). The findings indicate that scoring of dicentrics as well as microscopic analysis of gamma-H2AX foci are sensitive methods to quantify a radiation-induced biological damage at low doses. However, since gamma-H2AX foci can be partially repaired within a few hours, biological damages present for days or even months, which constitute the clinically relevant endpoints, can only be quantified reliably by scoring of chromosome aberrations. Thus currently the quantification of dicentrics or reciprocal translocations remains the recommended method for estimating the effect of exposures to low dose levels of radiation ('biological dosimetry'). However, owing to the high radiation sensitivity of the gamma-H2AX foci assay observed in the present study, further investigations on the effectiveness of low-linear energy transfer radiation qualities in producing gamma-H2AX foci in lymphocytes from healthy donors should be performed.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Radiation-induced apoptosis; Double-strand breaks; kV X-rays; Biological dosimetry; Peripheral lymphocytes; Computed-tomography; Comet assay; DNA-damage; in-vivo; Aberrations
ISSN (print) / ISBN
0144-8420
e-ISSN
1742-3406
Zeitschrift
Radiation Protection Dosimetry
Quellenangaben
Band: 134,
Heft: 1,
Seiten: 55-61
Verlag
Oxford University Press
Verlagsort
Oxford
Nichtpatentliteratur
Publikationen
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Radiation Biology (ISB)