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Mouse transferrin was used to specifically label the plasma transferrin iron pool for studies of iron kinetics in normal mice and infected mice during the hypoferremic phase of experimental meningococcal infection. The plasma transferrin iron pool of normal mice was found to be very dynamic, with a half-life of iron in the pool of 0.7 h. Iron left the plasma pool, entered the bone marrow, and was released into the blood in erythrocytes. Iron from the transferrin pool also entered the liver and spleen and was presumably in the reticuloendothelial system components of these organs. Most of the iron that had been supplied as transferrin iron was found in erythrocytes by 48 h after injection. Studies with mice infected with Neisseria meningitidis strain M1011 revealed similar kinetics for transferrin iron. There was no redistribution of iron within the various iron pools as a result of infection. Iron turnover in the plasma transferrin pool during the hypoferremic phase was similar to control rates, and iron leaving the pool entered its normal erythroid compartments. The lack of accelerated turnover of plasma iron and the finding that plasma iron was not rerouted to storage compartments during the hypoferremic phase provided good evidence that lactoferrin and leukocytic endogenous mediator were not directly involved in redirecting transferrin iron. Our evidence has implicated an impaired return of reticuloendothelial system-processed iron to the transferrin pool during the hypoferremic response. This appears to be a logical point in the erythroid iron cycle for host-mediated iron sequestration, as the reticuloendothelial system is involved in iron storage and may regulate iron levels in the plasma transferrin pool under normal conditions.

Turnover in the transferrin iron pool during the hypoferremic phase of experimental Neisseria meningitidis infection in mice