because of a demonstrated inhibitory action of calcium ( 10 and 20 mumol/l ) on renal mitochondrial conversion of 25 hydroxyvitamin d3 to 1,25 dihydroxyvitamin d3 , the effect of theophylline and dibutyryl cyclic amp on cellular calcium-45 efflux and total renal tubule calcium content was estimated .
C0026237
mitochondrial
C0007634
cellular