Document Detail


GFR regulation and flow-dependent electrophysiology of early distal tubule in Amphiuma.
MedLine Citation:
PMID:  3618789     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Tubuloglomerular feedback (TGF) in mammals and amphibians senses flow-dependent concentration changes in tubular fluid of the distal tubule and signals to arterioles to initiate changes in glomerular filtration rate. The distal tubules and afferent arterioles are situated on the surface of the kidney of Amphiuma means. Micropuncture techniques were used to measure luminal and intracellular chloride concentrations and the associated electrical potential differences, while tubular perfusion rate was varied. Transepithelial potential difference (PDte) and basolateral potential difference (PDbl) became more positive at increased tubular flow rates. Intratubular and intracellular chloride concentrations also increased significantly with perfusion rate. Single-nephron glomerular filtration rate decreased when perfusion rate was increased but this response was eliminated by the inclusion of furosemide in the perfusion solution; the drug also inhibited the flow dependence of PDte. The results suggest that local changes in PD and Cl- activity result from flow-dependent changes in the rate of hypertonic NaCl transport propagated along the length of the perfused segment; they establish a correlation between the rate of transport and the magnitude of the TGF inhibition; and, because transport and TGF can be jointly inhibited, they suggest a causal link between the two.
Authors:
B E Persson; D J Marsh
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The American journal of physiology     Volume:  253     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1987 Aug 
Date Detail:
Created Date:  1987-09-17     Completed Date:  1987-09-17     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  F263-8     Citation Subset:  IM    
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MeSH Terms
Descriptor/Qualifier:
Animals
Electrophysiology
Glomerular Filtration Rate*
Intracellular Membranes / physiology
Kidney Tubules / physiology*
Kidney Tubules, Distal / cytology,  physiology*
Urodela
Grant Support
ID/Acronym/Agency:
AM-15968/AM/NIADDK NIH HHS

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


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