Effect of dietary calcium supplementation on blood pressure and calciotropic hormones in mineralocorticoid-salt hypertension

Donald J. Dipette, Phillip E. Greilich, G. Allen Nickols, Gary A. Graham, Allan Green, Cary W. Cooper, O. Bryan Holland

Research output: Contribution to journalArticlepeer-review

26 Scopus citations

Abstract

In order to determine the effect of dietary calcium supplementation on blood pressure and calciotropic hormones, we studied two groups (n = 12 each) of mineralocorticoid [deoxycorticosterone (DOC)]-salt hypertensive rats, one receiving a normal-calcium diet (0.6% calcium, as calcium carbonate) and the other a high-calcium diet (2.5% calcium), over an 8-week period. Dietary calcium supplementation significantly attenuated the rise in blood pressure. Serum ionized calcium concentrations were significantly decreased from baseline levels in both groups but tended to be higher among the calcium-supplemented rats. Serum concentrations of parathyroid hormone (PTH) and 1,25-dihydroxyvitamin D3 (1,25-D) were significantly higher in the DOC-salt rats than in normotensive rats fed normal rat chow [PTH: 49 ± 4 versus 15±0.9pg/ml (means ± s.e.m.); 1,25-D: 108 ± 7 versus 73±13pg/ml, in DOC-salt and normotensive rats, respectively]. In the DOC-salt rats, dietary calcium supplementation did not significantly lower the elevated serum concentration of PTH (from 49 ± 4 to 40 ± 4pg/ml; NS), but did significantly reduce that of 1,25-D (from 108 ± 7 to 66 ± 8pg/ml; P < 0.01). Since 1,25-D may increase vascular smooth muscle calcium uptake, dietary calcium supplementation may lower blood pressure in DOC-salt hypertension, in part, by suppressing 1,25-D.

Original languageEnglish (US)
Pages (from-to)515-520
Number of pages6
JournalJournal of Hypertension
Volume8
Issue number6
DOIs
StatePublished - Jun 1990

Keywords

  • Blood pressure
  • Calcium
  • Hypertension
  • Mineralocorticoids
  • Parathyroid hormone
  • Vitamin d

ASJC Scopus subject areas

  • Internal Medicine
  • Physiology
  • Cardiology and Cardiovascular Medicine

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