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DOI: 10.1055/s-0035-1553209
Radiation Induced DNA Double-Strand Breaks in Radiology
Strahleninduzierte DNA-Doppelstrangbrüche in der RadiologiePublikationsverlauf
12. Februar 2015
16. Mai 2015
Publikationsdatum:
02. September 2015 (online)
![](https://www.thieme-connect.de/media/roefo/201510/lookinside/thumbnails/roefo-2444en_10-1055-s-0035-1553209-1.jpg)
Abstract
Shortly after the discovery of X-rays, their damaging effect on biological tissues was observed. The determination of radiation exposure in diagnostic and interventional radiology is usually based on physical measurements or mathematical algorithms with standardized dose simulations. γ-H2AX immunofluorescence microscopy is a reliable and sensitive method for the quantification of radiation induced DNA double-strand breaks (DSB) in blood lymphocytes. The detectable amount of these DNA damages correlates well with the dose received. However, the biological radiation damage depends not only on dose but also on other individual factors like radiation sensitivity and DNA repair capacity. Iodinated contrast agents can enhance the x-ray induced DNA damage level. After their induction DSB are quickly repaired. A protective effect of antioxidants has been postulated in experimental studies. This review explains the prinicple of the γ-H2AX technique and provides an overview on studies evaluating DSB in radiologic examinations.
Key Points:
• Radiologic examinations including CT and angiography induce DNA double-strand breaks. Even after mammography a slight but significant increase is detectable in peripheral blood lymphocytes.
• The number of radiation induced double-strand breaks correlates well with the radiation dose.
• Individual factors including radiation sensitivity, DNA repair capacity and the application of iodinated contrast media has an influence on the DNA damage level.
Citation Format:
• Kuefner MA, Brand M, Engert C et al. Radiation Induced DNA Double-Strand Breaks in Radiology. Fortschr Röntgenstr 2015; 187: 872 – 878
Zusammenfassung
Der schädigende Effekt von Röntgenstrahlung auf biologische Gewebe ist bereits seit langem bekannt. Die Bestimmung der Dosisbelastung in der diagnostischen und interventionellen Radiologie erfolgt in erster Linie mithilfe physikalischer Verfahren anhand standardisierter Phantome oder mit mathematischen Dosissimulationen. Mit der γ-H2AX-Immunfluoreszenzmikroskopie steht seit einigen Jahren ein sehr sensitives Verfahren zur Quantifizierung strahleninduzierter DNA-Doppelstrangbrüche (DSB) in Blutlymphozyten zur Verfügung. Der messbare Strahlenschaden an der DNA korreliert hier sehr gut mit der deponierten Dosis. Andererseits werden jedoch auch individuelle Faktoren, wie z. B. die Strahlensensibilität oder die DNA-Reparatur berücksichtigt. Jodhaltige Kontrastmittel können den strahleninduzierten DNA-Schaden verstärken. Nach der Induktion werden die DSB rasch repariert. Mit neuen Ansätzen ist es sogar möglich, den DNA-Schaden in einzelnen Organen abzuschätzen. Erste experimentelle Studien postulieren einen protektiven Effekt von Antioxidantien. Diese Übersichtsarbeit beschreibt das Prinzip der γ-H2AX-Methode und gibt einen Überblick über die die wichtigsten Ergebnisse der bisher publizierten Studien, in denen während radiologischer Untersuchungen induzierte DSB untersucht wurden.
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