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  • Title: Influence of dietary Ca, Mg, and P on cyclic-AMP excretion and kidney calcification in the rat.
    Author: Parker HM, Forbes RM.
    Journal: Proc Soc Exp Biol Med; 1976 Jan; 151(1):215-20. PubMed ID: 175372.
    Abstract:
    A series of five experiments was conducted with young male albino rats to investigate effects of various levels of dietary Ca, P and Mg on urinary cAMP excretion and kidney calcification. Urinary cAMP excretion was shown to be directly correlated with injected parathyroid (PT) hormone dose level and to be inversely associated with dietary Ca intake. Thus, cAMP excretion may be presumed to reflect PT activity in the young rat. Magnesium deficiency tended to reduce cAMP excretion, while P excess did not affect it. Each treatment induced kidney calcification. Calcium deficiency increased cAMP excretion irrespective of Mg status, although nephrocalcinosis appeared only in the Mg-deficient animals. These data support the view that nephrocalcinosis of dietary origin in the rat is not mediated by increased PT activity.
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