Agent Protects Cells From Lethal Effects Of Radiation Even If Given After Exposure

Science Daily — No drugs exist to protect the public from the high levels of radiation that could be released by a "dirty" bomb or nuclear explosion. Such excessive exposure typically causes death within weeks as the radiation kills blood cells vital to clotting and fighting infection, along with the stem cells needed to replenish their supply. But now researchers at Washington University School of Medicine in St. Louis report they have developed an agent that protects cells from the lethal effects of radiation, regardless of
whether it is given before or after exposure.

Using this agent in mice, the investigators found that the treatment helped shield rapidly dividing cells that are most vulnerable to radiation-induced death, providing proof in principle that it is possible to fend off radiation damage, according to a study published in the April issue of Biochemical and Biophysical Research Communications.

Current treatments for severe radiation exposure, also called acute radiation syndrome, are limited to drugs that boost the production of blood cells and platelets, but this approach is futile if underlying stem cells are also killed off. Moreover, there are no available treatments that can be given after exposure to limit damage to cells.

"We are using an entirely different approach," says Clayton Hunt, Ph.D., of the Department of Radiation Oncology. "Rather than ramp up the production of blood cells, we are trying to prevent radiation-induced cell death from occurring in the first place."
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