the role played by 1,25-dihydroxyvitamin d3 [ 1,25 ( oh ) 2d3 ] and/or by calcium on the c-25 hydroxylation of vitamin d3 ( d3 ) was studied in hepatocytes isolated from d-depleted rats which were divided into four treatment groups : group 1 served as controls , group 2 received calcium gluconate , groups 3 and 4 were infused with 1,25 ( oh ) 2d3 at 7 and 65 pmol/24 h x 7 days respectively .
C0006675
calcium
C0006699
calcium gluconate