Abstract
Administration of ovine-prolactin (O-PRL) stimulated Ca 2+ uptake in isolated duodenal cells prepared from vitamin D-deficient rats. The time course of this effect was biphasic: uptake activity reached a peak in 2.5 hrs followed by a decrease at 5 hrs to original levels. This stimulatory effect of O-PRL was observed in vitamin D-deficient male, but not in female rats. This stimulatory effect was observed in 16- and 26-week old, but not 9 week old, animals. Increase in Ca 2+ uptake in duodenal cells was not due to a decrease in intracellular Ca 2+ efflux. We measured serum Ca concentration in vitamin D-deficient female rats and found that serum Ca increased in D-deficient female rats between 16 and 52 weeks whereas a minimal increase was observed in D-deficient male rats. Although prolactin was shown to stimulate duodenal Ca 2+ uptake, it appears that the source of the increse in levels of serum Ca in D-deficient female rats was not derived from an increase in Ca 2+ uptake by prolactin in duodenum. The increase in serum calcium with time may explain why female D-deficient rats survive longer then male.
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