Document Detail


Model for evaluating avian renal hemodynamics and glomerular filtration rate autoregulation.
MedLine Citation:
PMID:  3381917     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
Multiple vascular connections in normal avian kidneys make it difficult to experimentally manipulate renal blood flow patterns and perfusion pressures. In this study, hemostatic clips were used to obstruct the ureter of one kidney at the level of the ischiadic artery (IA) in anesthetized 3-wk-old chicks (Gallus domesticus). Kidney tissue upstream from the ureteral obstruction degenerated, leaving an intact caudal renal division with one route of arterial inflow branching from the IA. Renal function studies were conducted, using general anesthesia, when the birds reached 12-15 wk of age. A snare placed around the IA was used to unilaterally decrease renal arterial perfusion pressure (RAPP) for the experimental kidney. Under control conditions (snare loose), urine flow rates (UFR), glomerular filtration rates (GFR), clearance of p-aminohippuric acid, and fractional excretion of Na, K, Ca, and PO4 did not differ significantly, per gram of kidney weight, when experimental and intact contralateral kidneys were compared. Gradual tightening of the IA snare reduced RAPP stepwise. UFR decreased significantly from the initial control value when RAPP reached 40 mmHg, and urine flow ceased completely when RAPP reached 30-35 mmHg. In four of five birds, GFR did not decrease significantly between 110 and 60 mmHg but did decrease significantly below 60 mmHg. Urine osmolality was inversely correlated with UFR. Clearance of PAH did not decrease significantly from control values as RAPP ranged from 100 to 37 mmHg, possibly caused by increased renal portal blood flow. Overall, these results provide the first direct demonstration that in domestic fowl GFR is autoregulated at reduced RAPP.
Authors:
R F Wideman; C M Gregg
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The American journal of physiology     Volume:  254     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1988 Jun 
Date Detail:
Created Date:  1988-07-15     Completed Date:  1988-07-15     Revised Date:  2007-11-15    
Medline Journal Info:
Nlm Unique ID:  0370511     Medline TA:  Am J Physiol     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  R925-32     Citation Subset:  IM    
Affiliation:
Department of Poultry Science, Pennsylvania State University, University Park 16802.
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MeSH Terms
Descriptor/Qualifier:
Animals
Blood Pressure
Chickens / physiology*
Glomerular Filtration Rate*
Hemodynamics*
Homeostasis
Kidney / physiology*,  physiopathology
Male
Models, Biological
Organ Size
Osmolar Concentration
Renal Circulation
Ureteral Obstruction / physiopathology
Urine

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


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