Specific 1,25(OH)(2)D-3-mediated regulation of transcellular calcium transport in Caco-2 cells

Calcium transport in the apical-to-basolateral (A-to-B) or B-to-A direction was examined in cells treated with 10 nM 1,25-dihydroxyvitamin D-3 [1,25(O H)(2)D-3, calcitriol] for up to 72 h. Net A-to-B calcium transport was posi tive at all time points and increased from 0.14 +/- 0.06 to 0.50 +/- 0.01 n mol.well(-1).min(-1) after 72 h of calcitriol treatment. Neither phenol red transport nor transepithelial electrical resistance was altered by calcitr iol treatment, suggesting that the increase in net A-to-B calcium transport was not due to paracellular movement. Neither 25-hydroxyvitamin D-3 nor 24 ,25-dihydroxyvitamin D-3 (100 nM, 48 h) alters basal or calcitriol-stimulat ed A-to-B calcium transport. Treatment with the calmodulin antagonist trifl uoperazine (50 mu M) reduced calcitriol-stimulated A-to-B Ca transport by 5 6%. The transcription inhibitor actinomycin D inhibited calcitriol-regulate d A-to-B calcium transport as well as calbindin D-9k, and 24-hydroxylase mR NA accumulation. These data demonstrate that calcitriol-mediated A-to-B cal cium transport in Caco-2 cells is aspecific, transcellular process that req uires transcriptional events normally mediated through the vitamin D recept or.