Abstract
The effects of vitamin D on steady-state levels of rat intestinal Ca-pump mRNA were examined in RNA extracted from isolated cell fractions of the crypt-to-villus gradient of differentiation. Northern blots revealed three different size mRNAs. Vitamin D deficient animals showed a decrease in these Ca-pump mRNAs, which increased markedly after 1,25-(OH)2D3 repletion, particularly for the villus cell. The data suggest that one of the effects of 1,25-(OH)2D3 may be to modulate enterocyte Ca-pump mRNA and that this effect is partly dependent on the stage of cell differentiation.
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