Document Detail

Evidence for interference of 25 (OH) vitamin D3 with phosphaturic action of calcitonin.
MedLine Citation:
PMID:  193407     Owner:  NLM     Status:  MEDLINE    
The present study evaluated the effect of 25(OH)vitamin D3[25(OH)vit D3] on the phosphaturic action of calcitonin in anesthetized parathyroidectomized rats. In group 1, calcitonin was given intravenously over six clearance periods. In group 2, after three periods of calcitonin given intravenously, 25(OH)vit D3 was added and given together with calcitonin for three additional periods. During calcitonin infusion, Cp/CIn 0.18 +/- 0.02 (mean +/- SE) in group 1 was not different from the corresponding Cp/CIn 0.18 +/- 0.03 in group 2; but when 25(OH)vit D3 was added, Cp/CIn 0.12 +/- 0.01 in group 2 was lower (P less than 0.001) than the corresponding Cp/CIn 0.26 +/- 0.02 in group 1. With intravenous calcitonin the urinary excretion of cycle AMP (UcAMP) 97 +/- 29 in group 1 did not differ from the corresponding UcAMP 86 +/- 27 pmol/min in group 2, but when 25(OH)vit D3 was added UcAMP 41 +/- 12 in group 2 was lower (P less than 0.001) than the corresponding UcAMP 131 +/- 14 pmol/min in group 1. This study demonstrated that 25(OH)vit D3 blocks the phosphaturic action of calcitonin. The associated fall in Uctamp suggests that25 (OV)vit D3 acts possibly by inhibiting the calcitonin-induced activation of adenylate cyclase in the kidney. However, other alternative mechanisms of action have not been excluded.
M M Popovtzer; M S Blum; R S Flis
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  232     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1977 May 
Date Detail:
Created Date:  1977-06-30     Completed Date:  1977-06-30     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  E515-21     Citation Subset:  IM    
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MeSH Terms
Biological Transport / drug effects
Calcitonin / antagonists & inhibitors,  pharmacology*
Cyclic AMP / urine*
Glomerular Filtration Rate / drug effects
Hydroxycholecalciferols / pharmacology*
Kidney Tubules / drug effects
Phosphates / blood,  urine*
Reg. No./Substance:
0/Hydroxycholecalciferols; 0/Phosphates; 60-92-4/Cyclic AMP; 9007-12-9/Calcitonin

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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