Effect of dietary supplementation of iron and ascorbic acid on lead toxicity in rats.

In our laboratory, the protective and therapeutic effects of surplus dietary iron and ascorbic acid on cadmium toxicity in rats have been studied and in this experiment, an effect of surplus iron and ascorbic acid on lead toxicity was examined. In young rats ingesting a diet containing 500 ppm of lead, growth retardation and anemia were observed. Suplementation of 400 ppm of iron and 1% of ascorbic acid to the lead containing diet prevented the growth depression and anemia and caused reductions of concentrations of lead in the kidney and tibia. Whereas, addition of 50 ppm of cadmium to the lead containing diet aggravated the growth retardation and anemia, but reduced the concentrations of lead in the kidney and tibia. Dietary supplementation of iron to the lead containing diet prevented the growth depression and anemia and reduced the accumulation of lead in the kidney, however the supplementation of ascorbic acid alone did not show any ameliolative effects. Rats were fed the lead containing diet and then transferred to the basal diet with or without iron and ascorbic acid. Recoveries from the growth retardation and anemia were not observed in rats within a week after the transfer to the non-lead diet with or without iron and ascorbic acid. These results suggest that iron prevents the growth depression and anemia in rats ingesting lead by an inhibition of lead asborption.