title: Oophorectomy leads to a selective decrease in 1,25-dihydroxycholecalciferol receptors in rat jejunal villous cells.
abstract: The distribution of 1,25-dihydroxycholecalciferol [1,25-(OH)2D3] receptors in isolated rat jejunal cells was investigated in normal and oophorectomized female rats and also in vitamin D-deficient animals. Oophorectomy caused a selective reduction in 1,25-(OH)2D3 receptor numbers in villous cells, the reduction being similar (37%) in both normal and vitamin D-deficient animals. The data suggest that this effect of oophorectomy reflects a direct effect of oestrogens in the intestinal synthesis of 1,25-(OH)2D3 receptors, independent of the renal synthesis of 1,25-(OH)2D3. It is proposed that this phenomenon may, in part, explain the reduction in calcium absorption which occurs after oophorectomy or the menopause.
mesh_terms: D000818:Animals; D002369:Castration; D005260:Female; D007413:Intestinal Mucosa / Q000032:analysis; D007583:Jejunum / Q000032:analysis*; D008297:Male; D051381:Rats; D011919:Rats, Inbred Strains; D018167:Receptors, Calcitriol; D011987:Receptors, Steroid / Q000032:analysis*; D014808:Vitamin D Deficiency / Q000378:metabolism
chemical_list: D018167:Receptors, Calcitriol; D011987:Receptors, Steroid