Intravenous Gene Therapy Protects Tissue During Whole-Body Radiation

Gene therapy administered intravenously could be used as an agent to protect vital organs and tissues from the effects of ionizing radiation in the event of large-scale exposure from a radiologic or nuclear dirty bomb, according to a recent laboratory study with mice.

"Ionizing radiation can be extremely damaging to cells, tissues, organs and organ systems,” noted Joel S. Greenberger, M.D., professor and chairman, department of radiation oncology at the University of Pittsburgh School of Medicine (PA, USA). "In previous studies, we demonstrated that gene therapy can be both swallowed in pill form and inhaled through a nebulizer prior to radiation exposure to protect healthy tissues from damage. In this study, we found that the same therapy administered intravenously also offers protection during exposure to whole-body irradiation.” Dr. Greenberger added that intravenous administration could potentially offer wide-reaching protection to the public in the event of a terrorist attack since experts believe a significant number of the population would die within 30 days of receiving a large dose of radiation to the entire body.

The researchers presented their study's findings in November 2006 at the 48th Annual Meeting of the American Society for Therapeutic Radiology and Oncology (ASTRO) in Philadelphia (PA, USA).

In the study, mice were used to evaluate the protective effects of manganese superoxide dismutase plasmid liposome (MnSOD-PL) gene therapy on the bone marrow during whole-body irradiation. The researchers found that in a control group of mice that received an initial 9 Gy dose of radiation there was 80% survival at 30 days compared to 93.3% survival during the same length of time for an experimental group of mice that were injected with MnSOD-PL prior to irradiation. As the level of radiation exposure was increased, survival rates in the mice injected with MnSOD-PL before exposure increased considerably. For example, at 9.5 Gy, mice in the control group had a survival rate of 53%, whereas mice in the experimental group had a survival rate of 87%. Following irradiation to 9.75 Gy, only 12.5% of the mice in the control group survived, while 75% of the MnSOD-PL group survived.

"Intravenous administration of gene therapy appears to prevent the damaging effects of radiation, suggesting it is a viable delivery method,” said Dr. Greenberger. "Future clinical studies will tell us whether this therapy can protect people from the deadly effects of radiation.”



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