Document Detail

Altered renal hemodynamics and impaired myogenic responses in the fawn-hooded rat.
MedLine Citation:
PMID:  10070148     Owner:  NLM     Status:  MEDLINE    
The present study examined whether an abnormality in the myogenic response of renal arterioles that impairs autoregulation of renal blood flow (RBF) and glomerular capillary pressure (PGC) contributes to the development of renal damage in fawn-hooded hypertensive (FHH) rats. Autoregulation of whole kidney, cortical, and medullary blood flow and PGC were compared in young (12 wk old) FHH and fawn-hooded low blood pressure (FHL) rats in volume-replete and volume-expanded conditions. Baseline RBF, cortical and medullary blood flow, and PGC were significantly greater in FHH than in FHL rats. Autoregulation of renal and cortical blood flow was significantly impaired in FHH rats compared with results obtained in FHL rats. Myogenically mediated autoregulation of PGC was significantly greater in FHL than in FHH rats. PGC rose from 46 +/- 1 to 71 +/- 2 mmHg in response to an increase in renal perfusion pressure from 100 to 150 mmHg in FHH rats, whereas it only increased from 39 +/- 2 to 53 +/- 1 mmHg in FHL rats. Isolated perfused renal interlobular arteries from FHL rats constricted by 10% in response to elevations in transmural pressure from 70 to 120 mmHg. In contrast, the diameter of vessels from FHH rats increased by 15%. These results indicate that the myogenic response of small renal arteries is altered in FHH rats, and this contributes to an impaired autoregulation of renal blood flow and elevations in PGC in this strain.
R P van Dokkum; C W Sun; A P Provoost; H J Jacob; R J Roman
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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:  276     ISSN:  0002-9513     ISO Abbreviation:  Am. J. Physiol.     Publication Date:  1999 Mar 
Date Detail:
Created Date:  1999-04-15     Completed Date:  1999-04-15     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:  R855-63     Citation Subset:  IM    
Department of Pediatric Surgery, Erasmus University Medical School, 3000 DR, Rotterdam, The Netherlands.
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MeSH Terms
Glomerulosclerosis, Focal Segmental / pathology
Hemodynamics / physiology
Kidney Glomerulus / pathology
Muscle Development*
Muscle, Smooth, Vascular / growth & development*
Rats, Inbred Strains / physiology*
Renal Artery / growth & development
Renal Circulation / physiology*
Grant Support

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