Document Detail

Distal site of action of parathyroid hormone on phosphate reabsorption.
MedLine Citation:
PMID:  1211488     Owner:  NLM     Status:  MEDLINE    
The sites of inhibited phosphate transport following administration of bovine parathyroid hormone (bPTH) to thyroparathyroidectomized (TPTX) dogs were investigated. Phosphate reabsorption by the proximal and distal nephron was studied using recollection micropuncture, stop-flow methodology, and electron-probe microanalysis. Following bPTH, delivery of phosphate from the proximal tubule increased from 26 to 37% of the filtered load, P less than .01. Fractional phosphate excretion increased from 2.3 +/- 1.5 to 21.4 +/- 2.3%, P less than .001. The increased delivery of phosphate at the point of micropuncture in the proximal tubule accounted for approximately half of the phosphaturia. In six TPTX dogs, which were saline loaded, similiar increases in phosphate delivery from the proximal tubule from 27 +/- 1 to 36 +/- 2% of the filtered load resulted in a strikingly smaller phosphaturia, 5.1 +/- 1 to 9.8 +/- 2.4%, NS. In stop-flow experiments, phosphate concentratin ratios were slightly increased in the proximal nephron and markedly increased in the distal nephron following bPTH. It is concluded that parathyroid hormone markedly decreases phosphate transport in the distal nephron.
F G Knox; C Lechene
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  229     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1975 Dec 
Date Detail:
Created Date:  1976-04-01     Completed Date:  1976-04-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1556-60     Citation Subset:  IM    
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MeSH Terms
Aminohippuric Acids / diagnostic use
Calcium / blood,  urine
Insulin / diagnostic use
Kidney Tubules / physiology*
Kidney Tubules, Distal / physiology*
Parathyroid Glands / surgery
Parathyroid Hormone / physiology*
Phosphates / metabolism*,  urine
Potassium / blood,  urine
Sodium / blood,  urine
Reg. No./Substance:
0/Aminohippuric Acids; 0/Parathyroid Hormone; 0/Phosphates; 11061-68-0/Insulin; 7440-09-7/Potassium; 7440-23-5/Sodium; 7440-70-2/Calcium

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

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