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  • 1
    ISSN: 1432-0827
    Keywords: Respiratory alkalosis ; Ionized calcium ; 1,25 Dihydroxycholecalciferol ; Parathyroid hormone
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Summary The daily administration of supraphysiological doses of 1,25 dihydroxycholecalciferol (0.1–2.5 µg/d/100 g body weight) to rats, produced respiratory alkalosis. With the doses of 0.1–0.2 µg/d/100 g and feeding a diet with 0.7% of calcium, calcemias did not exceed 2.75 mM, and significantly reduced plasma ionized calcium levels were measured. The latter phenomenon was found associated with increased urinary excretion of cAMP, soft tissue calcium content, and polyuria with hypostenuria, all known effects of parathyroid hormone. These effects were absent in thyroparathyroidectomized rats treated in the same fashion. Present results suggest that the stimulus of low levels of plasma ionized calcium overcomes the probably inhibitory effect of the steroid on parathyroid hormone secretion.
    Type of Medium: Electronic Resource
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