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Variable Effects of Iron Status on the Concentration of Ferritin in Rat Plasma, Liver, and Spleen

The Procter & Gamble Company, Miami Valley Laboratories, P.O. Box 39175, Cincinnati, Ohio 45247

The present studies were conducted to determine the relationships between iron status and ferritin levels in plasma, liver, and spleen of rats. Rats were fed either iron-adequate or iron-deficient purified diets, and measurements of hemoglobin and plasma and tissue ferritin levels were made at various times during iron depletion and iron repletion. Although mean plasma ferritin concentrations of iron-deficient rats were directionally less than those of iron-adequate rats, these differences were not statistically significant due to high variability among similarly treated animals. During iron repletion plasma ferritin concentrations again were so variable that no significant effect of iron repletion on plasma ferritin concentration was observed. On the other hand, liver and spleen ferritin concentrations of similarly treated rats were much less variable. Ferritin liver and spleen stores decreased more rapidly than hemoglobin during iron deficiency and were restored more slowly than hemoglobin during iron repletion. There was no evidence of correlation between liver and plasma ferritin concentration. Because of the variable responses of plasma ferritin concentration to iron depletion and repletion and the lack of relationship between plasma and liver ferritin concentrations, it is concluded that plasma ferritin concentration is not a good indicator of iron status in rats.

KEY WORDS: • iron status • plasma ferritin • serum ferritin • liver ferritin • spleen ferritin • hemoglobin

Manuscript received 8 April 1977.

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