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Immunocytochemical localization of rat intestinal vitamin D-dependent calcium-binding protein

AN Taylor, WA Gleason and GL Lankford

Vitamin D-dependent calcium-binding protein (CaBP) was localized in intestinal tissue sections obtained from rats raised under three different nutritional conditions: a normal vitamin D-replete diet, a vitamin D-free diet followed by supplementation with vitamin D3, or a vitamin D-free diet without additional supplementation. An indirect immunoperoxidase technique, with immunocontrols, was used to visualize the specific sites of CaBP. CaBP was visualized only in the cytoplasm of absorptive cells. In the duodenum of animals raised on a normal diet, CaBP was present in absorptive cells from the upper crypt region to the villus tips. In the jejunum, many fewer absorptive cells contained CaBP, while in the ileum only random absorptive cells near the villus tips contained CaBP. In rats raised on a vitamin D-deficient diet then supplemented with vitamin D3, CaBP was present in cells at the full depth of the crypts and in absorptive cells along the total villus length in the duodenum. Rats raised on the same deficient diet but without supplementation with additional vitamin D exhibited no CaBP in crypt cells nor in absorptive cells more than half way up the villi. Absorptive cells higher on the villi contained immunoreactive CaBP but the intensity of immunostaining and number of CaBP-containing cells was markedly reduced compared to the vitamin D-supplemented group.

Volume 32, Issue 2, pp. 153-158, 02/01/1984
Copyright © 1984 by The Histochemical Society


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