M A Ignatov, A K Chigasova, A A Osipov, Yu A Fedotov, N Yu Vorobyeva, A N Osipov
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Effect of X-Ray Energy on the Quantitative Yield of γH2AX and 53BP1 Foci in Human Mesenchymal Stem Cells.
We compared the influence of X-rays generated at the peak anode voltages of 50, 100, and 200 kVp on the quantitative yield of foci (localized dynamic microclusters) of proteins involved in repair critical radiation-induced DNA damage, double-strand breaks (γH2AX and 53BP1), in cultured human mesenchymal stem stromal cells. Calculations of the relative biological effectiveness (RBE) based on the experimentally obtained dose curves of changes in the number of γH2AX and 53BP1 foci indicate that relative to the standard 200 kVp X-ray radiation taken as 1, the RBE of 100 kVp radiation is ~1.15, and that of 50 kVp is ~1.50. The obtained results indicate the necessity for thorough fundamental studies for evaluation of the real RBE of low-energy X-rays with subsequent correction of the weighting factor values.
期刊介绍：
Bulletin of Experimental Biology and Medicine presents original peer reviewed research papers and brief reports on priority new research results in physiology, biochemistry, biophysics, pharmacology, immunology, microbiology, genetics, oncology, etc. Novel trends in science are covered in new sections of the journal - Biogerontology and Human Ecology - that first appeared in 2005.
World scientific interest in stem cells prompted inclusion into Bulletin of Experimental Biology and Medicine a quarterly scientific journal Cell Technologies in Biology and Medicine (a new Russian Academy of Medical Sciences publication since 2005). It publishes only original papers from the leading research institutions on molecular biology of stem and progenitor cells, stem cell as the basis of gene therapy, molecular language of cell-to-cell communication, cytokines, chemokines, growth and other factors, pilot projects on clinical use of stem and progenitor cells.
The Russian Volume Year is published in English from April.
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