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American Journal of Pathology, Vol 131, 339-343, Copyright © 1988 by American Society for Investigative Pathology

REGULAR ARTICLES

Short-lasting accumulation in osteoid bone seams of radioactive iron injected as citrate into mice

H Huser, L Gerber, P Eichenberger, E Waelti and H Cottier
Institute of Pathology, University of Bern, Switzerland.

The possible role in vivo of osseous structures in binding radioactive iron injected as a low-molecular-weight complex was studied in mice, using combined autoradiography and histomorphometry on sections of undecalcified, plastic-embedded femur epiphyses/metaphyses. A single intraperitoneal injection of 10 microCi 59Fe (1.2 micrograms Fe) per animal as citrate within 3 hours led to a preferential accumulation of this metal in the osteoid mineralized tissue interphase (osteoid seams) of bone. Within the next 2 days the labeling intensity in this localization diminished markedly to approximate levels of the bone marrow and calcified bone. The bulk of the injected radioiron was utilized according to known erythrokinetics. Findings suggest a direct entry of "free," ie, not transferrin-bound, iron into osteoid seams and its consecutive rapid removal from this site.


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Copyright © 1988 by the American Society for Investigative Pathology.