RESUMO
The radioprotective effects of the naturally occurring compound chlorogenic acid have been investigated against mortality induced by gamma-irradiation in mice. Chlorogenic acid was administrated at single doses of 100, 200 and 400 mg/kg 1 or 24 h prior to lethal dose of gamma-irradiation (8.5 Gy). At 30 days after treatment, the percentage of survival in each group was as follows: control, 20%; 100 mg/kg, 20% and 15%; 200 mg/kg, 45% and 15%; 400 mg/kg, 25% and 35% for 1 h and 24 h treatment prior gamma-irradiation, respectively. Survival rate was statistically increased in animals treated with this agent at 200 mg/kg at 1 h prior to irradiation as compared with the irradiation only group. Other doses of chlorogenic acid have not showed any enhanced survival when it was administrated at 1 or 24 h before irradiation. Chlorogenic acid exhibited concentration-dependent activity on 1,1-diphenyl-2-picrylhydrazyl free radical to show strong antioxidant activity. It appeared that chlorogenic acid with antioxidant activity reduced mortality induced by gamma-irradiation.
