Vitamin A antagonizes the action of vitamin D in rats - PubMed (original) (raw)
. 1999 Dec;129(12):2246-50.
doi: 10.1093/jn/129.12.2246.
Affiliations
- PMID: 10573558
- DOI: 10.1093/jn/129.12.2246
Vitamin A antagonizes the action of vitamin D in rats
C M Rohde et al. J Nutr. 1999 Dec.
Abstract
Interactions between vitamin A and vitamin D have been suggested for several decades but have not been established. In particular, vitamin A has been proposed to intensify the severity of the bone mineralization disease, rickets and inhibit the ability of vitamin D to cure this disease. To investigate this hypothesis, weanling Holtzman rats were fed a 1.2% calcium, 0.1% phosphorus diet and 15.5 ng ergocalciferol (vitamin D(2)) every 3 d for 21 d in the presence of increasing amounts of retinyl acetate (0 microg to 8621 microg/d). The increasing amounts of retinyl acetate produced a progressive and significant decrease in total bone ash (P < 0.001) and an increase in epiphyseal plate width (P < 0.001). The same experiment conducted with increasing amounts of vitamin D(2) (0 to 645 ng/d) indicated that the antagonism by retinyl acetate could be demonstrated at all vitamin D(2) dosages. To further investigate this antagonistic relationship, weanling Holtzman rats were fed a 0. 47% calcium, 0.3% phosphorus diet and 15.5 ng vitamin D(2) every 3 d for 33 d in the presence of increasing retinyl acetate (0 to 3448 microg/d). In the absence of retinyl acetate, these rats maintained a normal serum calcium level (2.34 mmol/L). Increasing retinyl acetate, however, eliminated the ability of vitamin D(2) to elevate the level of serum calcium (1.35 mmol/L). These results illustrated in vivo antagonism of vitamin D(2) action on intestine and bone by retinyl acetate.
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