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Am J Physiol Gastrointest Liver Physiol 283: G618-G625, 2002. First published December 19, 2001; doi:10.1152/ajpgi.00269.2001
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Vol. 283, Issue 3, G618-G625, September 2002

Vitamin D-inducible calcium transport and gene expression in three Caco-2 cell lines

James C. Fleet1, Faria Eksir2, Kenneth W. Hance1, and Richard J. Wood3

1 Department of Foods and Nutrition, Purdue University, West Lafayette, Indiana 47906; 2 Graduate Program in Nutrition, University of North Carolina at Greensboro, Greensboro, North Carolina 27403; and 3 Mineral Bioavailability Laboratory, United States Department of Agriculture Human Nutrition Research Center on Aging at Tufts University, Boston, Massachusetts 02111

The parental cell line (P) of Caco-2 cells and two clones, BBe and TC7, were studied at 11 days postconfluence to test the facilitated diffusion model of vitamin D-mediated intestinal calcium absorption (CaTx). Nuclear vitamin D receptor (nVDR) and calbindin D9k (CaBP) were measured by Western blot; 1,25-hydroxyvitamin D3 24-hydroxylase (CYP24), CaBP, plasma membrane Ca-ATPase (PMCA), and Ca transport channel (CaT1) mRNA levels were examined by RT-PCR; and net apical-to-basolateral CaTx was examined after treating cells with vehicle or 10 nM calcitriol for 8 (mRNA levels) or 48 h (protein, CaBP mRNA, CaTx). nVDR level was lowest in BBe (38% P value) and directly related to CYP24 induction (TC7 = P, which were 1.56 times greater than BBe). nVDR was inversely related to the vitamin D-induced levels of CaT1 mRNA, CaBP mRNA, PMCA mRNA, and net CaTx, with the highest induction seen in BBe. Basal CaBP mRNA (86 times greater than P) and protein levels were highest in TC7 cells and were not associated with higher net CaTx, suggesting CaBP may not be rate limiting for CaTx in these cells.

intestine; calcium absorption; calbindin D9k; calcium transport channel; plasma membrane Ca-adenosinetriphosphatase


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