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Small molecules in the blood might gauge radiation effects after exposure
Date:2/25/2013

e and late effects."

The findings might also one day allow doctors to evaluate radiation toxicity during the course of therapy based on an individual's biology. "This would particularly benefit leukemia and lymphoma patients who receive total body irradiation in preparation for stem-cell transplantation," Chakravarti says.

First author Dr. Naduparambil Jacob, a research assistant professor in radiation oncology, noted that the study could be an important step in the development of biological dosimetry, or biodosimetry, a technology for identifying people at risk for acute radiation illnesses that develop within weeks of radiation exposure, and cancers and degenerative diseases that can occur months or years later.

"Biodosimetry is an emerging concept that could enable us to identify individuals who need immediate treatment after a radiation exposure and to better develop personalized radiation treatment plans for patients," Jacob says.

For this study, Chakravarti, Jacob and their colleagues evaluated dose-dependent changes in levels of 88 individual microRNAs in serum from mice after a single acute radiation exposure, and after fractionated doses of radiation that are typical of radiation treatment prior to stem-cell transplantation. Samples were collected from exposed and control animals 24 or 48 hours after exposure.

Key technical findings include:

  • After a one-time exposure, miRNA-150 showed a clear decrease over time with increasing radiation dose, with a drop of 30 percent after 24 hours and of 50 percent after 48 hours, even at the lowest exposure of one gray of radiation.

  • miRNA-200b and miRNA-762 showed increased levels after radiation exposure, with the changes more pronounced in animals receiving higher doses.

  • Animals receiving fractioned doses showed similar changes; e.g., miRNA-150 dropped about 50 percent after 24 hours in animals receiving 4 gray.


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Contact: Darrell E. Ward
Darrell.Ward@osumc.edu
614-293-3737
Ohio State University Medical Center
Source:Eurekalert

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