PMID: 9553988Apr 29, 1998Paper

The effect of 1,25-vitamin D3 on calbindin-D and calcium-metabolic variables in the rat

Pharmacology & Toxicology
C HemmingsenK Olgaard

Abstract

Intraperitoneal injection of 1,25-(OH)2D3 4 micrograms/kg was given to 84 calcium- and vitamin D-repleted Wistar rats and samples of plasma, duodenal mucosa and renal tissue were taken after 0, 3, 6, 12, 24, 48 and 96 hr (n = 12 at each time interval). Plasma-ionized Ca increased after 6 hr, reached a maximum after 24 hr and returned to the initial values after 96 hr. The concentrations of renal calbindin-D28k and intestinal calbindin-D9k did not increase until 48 hr after injection and remained elevated until 96 hr after. Therefore, significantly elevated concentrations of the cytosolic calbindin-D were found at a time with normal values of plasma Ca. The present data suggest that calbindin-D does not alone increase the transcellular Ca transport and, therefore, supports the view that calbindin-Ds may serve as Ca buffer proteins.

References

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