The identification of a putative apical Ca++ channel in 1,25-dihydroxyvitam
in D-3 responsive epithelia (proximal intestine and the distal nephron) as
well as recent studies using calbindin-D-28k knock-out mice indicating the
first direct in-vivo evidence for a role for this calcium-binding protein i
n renal calcium absorption suggest mechanisms, which had remained incomplet
e, related to the control of renal calcium absorption. Curr Opin Nephrol Hy
pertens 9:341-347. (C) 2000 Lippincott Williams & Wilkins.