The clearance of 131I-human plasma ferritin in man

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Abstract
Ferritin was purified 33,000-fold from the plasma of patients with idiopathic hemochromatosis. The plasma ferritin was labeled with 131I and injected into 2 normal men. Clearance was found to be relatively slow, with 50% 131I-ferritin remaining in the plasma at 27–30 hr. The fraction of plasma ferritin that bound to concanavalin-A was found to be cleared more slowly than the nonbinding fraction. These findings confirm our previous suggestion that glycosylation is a major factor prolonging the survival of ferritin in the plasma, but differ from the results of earlier studies in experimental animals and preterm infants, which indicated very rapid plasma ferritin turnover.

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