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Cadmium binding components in the supernatant fraction of the small intestinal mucosa of rats administered cadmium.

Cadmium binding protein was isolated from the supernatant fraction of the small intestine of rats continuously administered cadmium for 1, 3, 6, 9, 32, and 96 days. The following were the results:(1) The cadmium concentration in the mucosal tissue scraped from the small intestine was three times that of the lower layers, and of the total amount of cadmium in the mucosal tissue about two-thirds was associated with the cytosol.(2) When the cytosol of the intestinal mucosal tissue was chromatographed on a Sephadex G-75 column, cadmium was almost always bound to proteins whose molecular weights ranged from 5, 400 to 9, 800, even in samples of the 1-day group.(3) Cadmium in the liver and in the intestinal mucosa were in the same binding state, but as there was a lag period between the induction of the Cd-binding proteins of both tissues, the protein of the small intestinal mucosal cell must have been induced at the intestinal mucosa, itself, by contact with cadmium.(4) The cadmium binding protein of the small intestinal mucosal cell may play an important role in absorbing cadmium, because no other form of this metal was found in the mucosal cells of the small intestines.