Summary
Iron-deficient rats absorb from tied jejunal loops in vivo not only more iron than normal rats but also the chemically related metals cobalt, manganese and even zinc, but not copper. The retention of these metals, the absorption of which is increased, is equal in both normal and anemic animals.
Everted sacs in vitro, prepared from jejunal segments of iron-deficient rats, transfer iron, the chemically related metals already mentioned, and in addition nickel, to a greater extent than those of normal rats; under the experimental conditions in vitro this is not the case for copper. The uptake of these metals by the mucosal tissue was also greater with segments of iron-deficient rats than with those of normal ones.
Finally, mutual inhibition could be shown during absorption of iron and cobalt as well as of iron and manganese. The latter experiments were done in situ on tied loops of jejunum of rats in vivo.
These results can be explained by the assumption of an iron-binding system in the mucosa responsible for absorption: this system shows the highest degree of specificity for iron, followed by cobalt, nickel, manganese and zinc, but apparently does not react with copper.
As acceptors for iron and the chemically related metals, the proteins of the cell membrane may play a role comparable with that of the reticulocyte membrane responsible for the uptake and incorporation of iron in the reticulocytes. The coincidence of these processes leads us to believe that the mucosal epithelium and reticulocytes possess similar mechanisms which are responsible for uptake and/or transcellular transport of iron.
Die englische Fassung dieses Beitrages erschien in: Trace Element Metabolism in Animals (C. F. Mills, Ed.). Edinburgh-London: E. & S. Livingstone 1970. — Abdruck in deutscher Sprache erfolgt mit freundlicher Erlaubnis des Verlages E. & S. Livingstone.
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Forth, W. (1971). Resorption von Eisen and chemisch verwandten Metallen in vitro and in vivo; die Spezifität eines eisenbindenden Systems in der Mucosa des Jejunums von Ratten. In: Horst, W. (eds) Frontiers of Nuclear Medicine/Aktuelle Nuklearmedizin. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-65092-5_9
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