Endocrinology, Vol 128, 2844-2852, Copyright © 1991 by Endocrine Society

ARTICLES

Differential regulation by 1,25-dihydroxyvitamin D3 of calbindin-D9k and calbindin-D28k gene expression in mouse kidney

H Li and S Christakos
Department of Biochemistry and Molecular Biology, University of Medicine and Dentistry of New Jersey, New Jersey Medical School, Newark 07103-2714.

The mouse kidney is a unique tissue since both vitamin D-dependent calcium binding proteins (calbindin-D9k and calbindin-D28k) are present in the same cells of the distal convoluted tubule. We have used specific complementary DNAs to mouse calbindin-D9k and mouse calbindin- D28k and Northern and slot blot analyses in order to obtain a better understanding of the regulation of two different molecular expressions of 1,25-dihydroxyvitamin D3 [1,25(OH)2D3] action in the same cells. Both calbindins were found to be regulated developmentally in a similar manner (an increase in gene expression between birth and 1 week of age, coinciding with nephron differentiation, and a peak at 3 weeks of age). However, the time course of response of the messenger RNA of each calbindin to 1,25(OH)2D3 was markedly different. The peak of induction of renal calbindin-D28k mRNA was at 12 h after a single injection of 1,25(OH)2D3 (200 ng/100 g body wt) to vitamin D-deficient mice, and a decrease was observed at 24 h (similar to the time course of response of other steroid-regulated genes). Interestingly, unlike calbindin- D28k, a delayed response of renal calbindin-D9k mRNA to 1,25(OH)2D3 was observed (the peak of induction was at 24 h after 1,25(OH)2D3 administration). Both genes in mouse kidney did not respond to glucocorticoids, although a dose-dependent decrease (12-86%) of mouse intestinal calbindin-D9k mRNA was observed after dexamethasone treatment, suggesting tissue-specific multiple steroid interactions in the regulation of calbindin gene expression. The finding of a different time course of regulation of each calbindin by 1,25(OH)2D3 suggests that different factors may be regulating the expression of the two different calbindins in mouse kidney and that elucidation of these control mechanisms should provide new insight concerning 1,25(OH)2D3- regulated gene expression.

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