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1,25-Dihydroxyvitamin D3 (1,25(OH)2D3) induces de novo biosynthesis of a specific calcium-binding protein (CaBP) in embryonic chick duodenum in organ culture. Using a highly sensitive and specific, peroxidase-antiperoxidase immunocytochemical procedure, 1,25(OH)2D3-induced CaBP in the organ-cultured duodenum was found only in the cytoplasm of absorptive cells, corresponding to its localization in rachitic chick duodenal cells after a single injection of 1,25(OH)2D3 in vivo. This observation, along with evidence correlating CaBP with calcium transport, strongly supports the use of the embryonic chick duodenal organ culture system as a physiologically relevant model of the vitamin D-dependent calcium absorptive mechanism.

1,25-Dihydroxyvitamin D3-induced calcium-binding protein: localization in organ-cultured embryonic chick duodenum.