Redox metal chelation ameliorates radiation-induced bone marrow toxicity in a mouse model.

Abstract

Since zinc desferrioxamine (Zn-DFO) has been shown to be a very potent protector against injuries induced by redox-active metal ions, we examined its protective effect against radiation-induced toxicity. We found that treatment with Zn-DFO given before TBI increased the survival of mice irradiated with 7.5 and 8.5 Gy. Zn-DFO also protected against radiation-induced myelosuppression and body weight loss, while soluble Il6 levels in serum were normalized in mice pretreated with Zn-DFO. We concluded that administration of Zn-DFO prior to TBI protected BALB/c mice from radiation-induced toxicity, increasing survival rates by up to 75%. The biological effect of Zn-DFO is known to result from its effect on the production of intracellular hydroxyl free radicals mediated by redox-active metal ions, and both metal chelation and zinc delivery appear to be equally likely mechanisms for this outcome. We suggest that radiation-induced toxicity is caused by the deleterious effect of redox-active metal ions, and that compounds which modulate this redox activity may act as radioprotectors.

• Authors: R M Nagler, Y Eichen, A Nagler
• Journal: Radiation research (Radiat Res) Vol. 156 Issue 2 Pg. 205-9 (Aug 2001) ISSN: 0033-7587 [Print] United States
• PMID: 11448242 (Publication Type: Journal Article)

Chemical References

• Chelating Agents
• Interleukin-6
• Radiation-Protective Agents
• Deferoxamine
• Zinc

Topics

• Animals
• Body Weight (drug effects, radiation effects)
• Bone Marrow (drug effects, radiation effects)
• Chelating Agents (pharmacology)
• Deferoxamine (pharmacology)
• Interleukin-6 (blood)
• Leukocyte Count
• Male
• Mice
• Mice, Inbred BALB C
• Oxidation-Reduction
• Radiation Injuries, Experimental (blood, pathology, prevention & control)
• Radiation Tolerance (drug effects)
• Radiation-Protective Agents (pharmacology)
• Whole-Body Irradiation
• Zinc