Document Detail

Captopril and time dependent changes in post- to pre-glomerular resistance ratios in remnant kidneys of pre-hypertensive rats.
MedLine Citation:
PMID:  1585810     Owner:  NLM     Status:  MEDLINE    
Micropuncture experiments were performed on intact and remnant kidneys of male Sprague-Dawley rats before and after angiotensin converting enzyme inhibition with captopril (0.5 mg kg-1 iv). Partially nephrectomized rats were studied at 2 and 8 weeks post-surgery before the development of systemic hypertension. At 2 weeks, nephrectomized rats had a numerically higher tubular stop-flow pressure than controls (43 +/- 2 mmHg vs. 38 +/- 2 mmHg; P = 0.08) and a higher post- to pre-glomerular resistance ratio (Re/Ra) (0.40 +/- 0.03 vs. 0.31 +/- 0.03; P = 0.08). At 8 weeks, stop-flow pressure and post- to pre-glomerular resistance ratios were similar in remnant and intact kidneys. Captopril had no effect on stop-flow pressure in 2 week post-surgery nephrectomized rats or either control group, but it increased stop-flow pressure in 8 week post-surgery nephrectomized rats (40 +/- 2 to 44 +/- 2 mmHg, P = 0.04). This increase in stop-flow pressure was associated with an increase in the post- to pre-glomerular resistance ratio (0.33 +/- 0.02-0.42 +/- 0.02, P = 0.009). Stop-flow pressure was positively correlated with the post- to pre-glomerular resistance ratio in 2-week post-surgery nephrectomized rats and their respective controls when combined (r = 0.89, P = 0.0001) and 8-week post-surgery nephrectomized rats and their respective controls combined (r = 0.78, P = 0.0001). Stop-flow pressure was not significantly correlated with mean arterial pressures or welling-point pressures in these groups.(ABSTRACT TRUNCATED AT 250 WORDS)
W L Wilke; A E Persson
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Acta physiologica Scandinavica     Volume:  144     ISSN:  0001-6772     ISO Abbreviation:  Acta Physiol. Scand.     Publication Date:  1992 Mar 
Date Detail:
Created Date:  1992-06-12     Completed Date:  1992-06-12     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0370362     Medline TA:  Acta Physiol Scand     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  253-61     Citation Subset:  IM    
Department of Physiology, Colorado State University, Fort Collins 80523.
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MeSH Terms
Blood Pressure / drug effects,  physiology
Captopril / pharmacology
Hypertension, Renal / etiology,  physiopathology*
Kidney Glomerulus / blood supply*,  drug effects,  physiopathology
Rats, Inbred Strains
Time Factors
Vascular Resistance / drug effects,  physiology
Grant Support
1 FO 6 TWO1486-01/TW/FIC NIH HHS
Reg. No./Substance:

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