Methylproamine protects against ionizing radiation by preventing DNA double-strand breaks

Sprung, Carl N., Vasireddy, Raja S., Karagiannis, Tom C., Loveridge, Shanon J., Martin, Roger F., & McKay, Michael J. (2010) Methylproamine protects against ionizing radiation by preventing DNA double-strand breaks. Mutation Research/Fundamental and Molecular Mechanisms of Mutagenesis, 692(1-2), pp. 49-52.

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The majority of cancer patients will receive radiotherapy (RT), therefore, investigations into advances of this modality are important. Conventional RT dose intensities are limited by adverse responses in normal tissues and a primary goal is to ameliorate adverse normal tissue effects. The aim of these experiments is to further our understanding regarding the mechanism of radioprotection by the DNA minor groove binder, methylproamine, in a cellular context at the DNA level.

Materials and methods

We used immunocytochemical methods to measure the accumulation of phosphorylated H2AX (γH2AX) foci following ionizing radiation (IR) in patient-derived lymphoblastoid cells exposed to methylproamine. Furthermore, we performed pulsed field gel electrophoresis DNA damage and repair assays to directly interrogate the action of methylproamine on DNA in irradiated cells.


We found that methylproamine-treated cells had fewer γH2AX foci after IR compared to untreated cells. Also, the presence of methylproamine decreased the amount of lower molecular weight DNA entering the gel as shown by the pulsed field gel electrophoresis assay.


These results suggest that methylproamine acts by preventing the formation of DNA double-strand breaks (dsbs) and support the hypothesis that radioprotection by methylproamine is mediated, at least in part, by decreasing initial DNA damage.

Impact and interest:

4 citations in Scopus
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3 citations in Web of Science®

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ID Code: 78909
Item Type: Journal Article
Refereed: Yes
Keywords: Radioprotection, DNA damage and repair, Radiotherapy, Tissue injury, Radioprotector
DOI: 10.1016/j.mrfmmm.2010.08.005
ISSN: 0027-5107
Subjects: Australian and New Zealand Standard Research Classification > MEDICAL AND HEALTH SCIENCES (110000) > ONCOLOGY AND CARCINOGENESIS (111200)
Divisions: Current > QUT Faculties and Divisions > Faculty of Health
Deposited On: 24 Nov 2014 22:58
Last Modified: 26 Nov 2014 04:11

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