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Ferritin in the plasma of birds with erythroblastosis.

Abstract INTRODUCTION AVIAN erythroblastosis (Eb) is a virus-induced disease of chickens characterized by the presence of large numbers of primitive red cells in the circulating blood stream (Darcel, 1960). Preliminary studies had suggested disturbances in iron metabolism in Eb. When leukemic (Eb) blood is incubated with Fe59 there is incorporation into material with electrophoretic characteristics of fowl ferritin instead of into hemoglobin. The plasma of birds in the terminal stages of Eb shows the presence of additional plasma iron (Darcel and Bather, 1964) and it was suspected that this might also be ferritin. This paper shows that much of the iron present in Eb plasma is not bound to transferring and that it is likely present in molecules of ferritin, probably coated with a plasma protein. EXPERIMENTAL Virus: Engelbreth-Holm’s strain R virus (Eckert et al., 1956) was used to infect birds of the East Lansing Line 15 I White Leghorns.Birds were…