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Am J Physiol Endocrinol Metab 267: E356-E360, 1994;
0193-1849/94 $5.00
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AJP - Endocrinology and Metabolism, Vol 267, Issue 3 E356-E360, Copyright © 1994 by American Physiological Society

ARTICLES

Immunohistochemical localization of the 1,25(OH)2D3 receptor and calbindin D28k in human and rat pancreas

J. A. Johnson, J. P. Grande, P. C. Roche and R. Kumar
Department of Medicine, Mayo Clinic, Rochester, Minnesota 55905.

1,25-Dihydroxyvitamin D3 [1,25(OH)2D3] is required for normal glucose-stimulated insulin release from pancreatic beta-cells. Biochemical characterization techniques have demonstrated the presence of the 1,25(OH)2D3 receptor (VDR) in homogenates of whole pancreas. Autoradiographic studies using radiolabeled 1,25(OH)2D3 suggest that the VDR is localized to beta-cells but are inconclusive. We used immunohistochemical techniques to stain serial sections from both human and rat pancreas with polyclonal antibodies to human VDR, chick calbindin D28k, insulin, glucagon, and somatostatin. VDR was present in the islet cells and also at low levels in acinar cells of the human and rat pancreas. Calbindin D28k was distributed in a manner similar to the VDR in pancreatic islets but was not present in acini. These results show for the first time that VDR and calbindin D28k are present in human pancreatic tissue. VDR and calbindin D28k are focally distributed throughout pancreatic islet cell types in humans and rats; VDR is also present in the exocrine pancreas. These findings suggest that 1,25(OH)2D3 may influence both endocrine and exocrine pancreatic function.


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