Competitive nature of the intestinal transport mechanism for cobalt and iron in the rat

AUTOR(ES)

Thomson, A. B. R.

RESUMO

Dose- and time-response studies were performed in iron-loaded and iron-deficient rats in order to define, (a) the kinetics of absorption of cobalt and iron, (b) the nature of the inhibitory effect of one metal on the absorption of the other, and (c) the effect of variations in body iron stores on these processes. The duodenum was perfused for 5-90 min with labeled solutions containing 5.0 mM iron or 5.0 mM cobalt. In iron-loaded rats, the rate of cobalt absorption was constant for 90 min whereas the rate of iron absorption fell after 30 min. In comparison to these results, the rate of absorption of both metals was increased in iron deficiency, and was more rapid in the first 30 min than in the 30-90 min period.

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