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      1,25-Dihydroxyvitamin D 3 Target Cells in Rat Mammary Gland

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          In autoradiograms of mammary glands of rats on days 18 and 20 of pregnancy and day 6 of lactation after injection of <sup>3</sup>H 1,25-(OH)<sub>2</sub> vitamin D<sub>3</sub>, a nuclear concentration of radioactivity is observed in alveolar and ductal cells, as well as in cells of the epidermis of the nipple. Myoepithelial cells and connective tissue cells do not concentrate the hormone in their nuclei. The nuclear radioactivity appears specific, since 1,25-(OH)<sub>2 </sub>vitamin D<sub>3</sub> but not 25-(OH)2 vitamin D<sub>3</sub> prevents the uptake. The results suggest the existence of nuclear receptors for 1,25-(OH)2 vitamin D3 in mammary tissues and thus complements previous biochemical evidence showing the presence of cytoplasmic receptors for the hormone in mouse mammary glands; in addition, our results allow the identification of the cell types possessing the receptors.

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          Author and article information

          Horm Res Paediatr
          Hormone Research in Paediatrics
          S. Karger AG
          25 November 2008
          : 15
          : 4
          : 263-269
          aDepartment of Anatomy, University of Ottawa, Ottawa, Ont., Canada; bDepartments of Anatomy and Pharmacology, University of North Carolina, Chapel Hill, N.C., USA; cDepartment of Biochemistry, University of Wisconsin, Madison, Wisc., USA
          179465 Horm Res 1981;15:263–269
          © 1981 S. Karger AG, Basel

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