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Type: Artigo de periódico
Title: Early blood pressure normalization independent of the class of antihypertensive agent prevents augmented renal fibronectin and albuminuria in experimental diabetic nephropathy
Author: Lehfeld, LS
Silveira, LA
Ghini, B
de Faria, JBL
Abstract: Background/Aims: This study tested the hypothesis that prevention of the development of hypertension, and not the class of antihypertensive agent, inhibits the increase in renal fibronectin and albuminuria in experimental diabetes. Methods: Four-week-old spontaneously hypertensive rats (SHR), with diabetes induced by streptozotocin, were randomized for no treatment, or treatment with captopril, amlodipine, an association of captopril and amlodipine (Cap+A) or an association of captopril and verapamil (Cap+V) for 12 weeks. Results: Systolic blood pressure increased similarly in control (187 +/- 5 mm Hg, mean +/- SE) and diabetic (186 +/- 4) SHR and was kept within the normal range by amlodipine (131 +/- 3), captopril (127 +/- 3), Cap+A (134 +/- 4) and Cap+V (134 +/- 9, p < 0.0001). In diabetic rats, albuminuria was higher than in control SHR [geometric mean (variance), 1,213 ( 953 1,708) vs. 512 (213-850), p < 0.0001] and was reduced to a similar extent by amlodipine [573 (353-744), p < 0.0001], captopril [562 (238-771), p < 0.0001], Cap+A [679 (442-971), p < 0.0001] and Cap+V [748 (581-848) &mu;g/24 h, p = 0.0002]. Renal fibronectin increased in diabetic rats (24.0 &PLUSMN; 3.3 densitometric units, mean &PLUSMN; SE) compared to control rats (9.6 &PLUSMN; 1.8, p = 0.0005) and was normalized by amlodipine (9.9 &PLUSMN; 1.0, p = 0.0001), captopril (11.2 &PLUSMN; 0.4, p = 0.0016), Cap+A (9.9 &PLUSMN; 2.0, p = 0.0004) and Cap+V (14.7 &PLUSMN; 4.9, p = 0.0159). Conclusion: In this model, tight blood pressure control rather than the class of antihypertensive agent was the main determinant factor in attenuating of nephropathy. Copyright (C) 2004 S. Karger AG, Basel.
Subject: hypertension
diabetes mellitus
diabetic nephropathy
spontaneously hypertensive rats
renin-angiotensin system
Country: Suíça
Editor: Karger
Rights: aberto
Identifier DOI: 10.1159/000077535
Date Issue: 2004
Appears in Collections:Unicamp - Artigos e Outros Documentos

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