Renal responses to calcium deprivation in young rabbits

J. E. Bourdeau, R. Bouillon, D. Zikos, C. B. Langman

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

To evaluate the renal adaptations to dietary Ca deprivation, young growing female albino rabbits were fed a Ca-deficient diet for 8 consecutive days while they were housed in metabolism cages. Urinary Ca excretion rates decreased markedly within 24 h of Ca deprivation, reached a nadir by day 5, and remained low thereafter. Concomitantly, urinary P excretion increased. The hypocalciuria during the 8-day study was accounted for by an increased tubular reabsorption of Ca. Urinary cyclic AMP excretion was increased on the first day of Ca deprivation. Plasma immunoreactive parathyroid hormone and calcitriol concentrations were elevated after 8 days of Ca deprivation. Conversely, plasma calcifediol concentrations were decreased. We conclude that there are rapidly induced, appropriate renal homeostatic adaptations to dietary Ca deprivation in the rabbit and suggest that increases in endogenous plasma parathyroid hormone concentration, in part, play a role in mediating these changes.

Original languageEnglish (US)
Pages (from-to)150-157
Number of pages8
JournalMineral and Electrolyte Metabolism
Volume14
Issue number2-3
StatePublished - 1988

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry

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