Use of a microscope stage-mounted Nickel-63 microirradiator for real-time observation of the DNA double-strand break response.
Kuhne, Wendy W.
Merkley, Mark A.
Dynan, William S.
MetadataShow full item record
AbstractEukaryotic cells begin to assemble discrete, nucleoplasmic repair foci within seconds after the onset of exposure to ionizing radiation. Real-time imaging of this assembly has the potential to further our understanding of the effects of medical and environmental radiation exposure. Here, we describe a microirradiation system for targeted delivery of ionizing radiation to individual cells without the need for specialized facilities. The system consists of a 25-micron diameter electroplated Nickel-63 electrode, enveloped in a glass capillary and mounted in a micromanipulator. Because of the low energy of the beta radiation and the minute total amount of isotope present on the tip, the device can be safely handled with minimum precautions. We demonstrate the use of this system for tracking assembly of individual repair foci in real time in live U2OS human osteosarcoma cells. Results indicate that there is a subset of foci that appear and disappear rapidly, before a plateau level is reached approximately 30 min post-exposure. This subset of foci would not have been evident without real-time observation. The development of a microirradiation system that is compatible with a standard biomedical laboratory expands the potential for real-time investigation of the biological effects of ionizing radiation.
CitationNucleic Acids Res. 2010 Aug 19; 38(14):e144
- Ionizing-radiation induced DNA double-strand breaks: a direct and indirect lighting up.
- Authors: Vignard J, Mirey G, Salles B
- Issue date: 2013 Sep
- Live cell microscopy analysis of radiation-induced DNA double-strand break motion.
- Authors: Jakob B, Splinter J, Durante M, Taucher-Scholz G
- Issue date: 2009 Mar 3
- Radiation-induced DNA repair foci: spatio-temporal aspects of formation, application for assessment of radiosensitivity and biological dosimetry.
- Authors: Belyaev IY
- Issue date: 2010 Apr-Jun
- Regulation of ATM in DNA double strand break repair accounts for the radiosensitivity in human cells exposed to high linear energy transfer ionizing radiation.
- Authors: Xue L, Yu D, Furusawa Y, Okayasu R, Tong J, Cao J, Fan S
- Issue date: 2009 Nov 2
- Effect of prolonging interval time between coronary angiography and percutaneous coronary intervention on X-ray-induced DNA double-strand breaks in blood lymphocytes.
- Authors: Zhang G, Li Y, Wang M, Guo B, Lyu X, Liu JB, Liu D, Chang L
- Issue date: 2014