Chronic administration of oral vasopressin type 2 receptor antagonist tolvaptan exerts both myocardial and renal protective effects in rats with hypertensive heart failure.
Circ Heart Fail
; 5(4): 484-92, 2012 Jul 01.
Article
em En
| MEDLINE
| ID: mdl-22628529
ABSTRACT
BACKGROUND:
Although recent clinical trials have demonstrated the efficacy of the oral vasopressin (AVP) type 2 receptor (V2R) antagonist tolvaptan, its long-term effects on the myocardium and kidney in heart failure (HF) are not clear. We examined the chronic effects of tolvaptan administration on both the myocardium and kidney in a rat hypertensive HF model. METHODS ANDRESULTS:
Not only circulating AVP level but also myocardial AVP and V1a receptor (V1aR) expressions, renal V1aR, and V2R expressions were significantly upregulated during the transition to HF. The animals were chronically treated with low-dose or high-dose (HD) tolvaptan or vehicle from the left ventricular (LV) hypertrophic stage. Chronic tolvaptan treatment persistently increased urine volume but did not affect blood pressure. In the HD group, the animal survival significantly improved (log-rank test, P<0.01). At the HF stage, the progression of LV dysfunction was prevented and lung congestion was suppressed. Activation of atrial natriuretic peptide, endothelin-1, AVP, and V1aR mRNA levels were significantly suppressed in the LV myocardium. Meanwhile, renal histopathologic damage was ameliorated and renal function was improved in the HD group at the HF stage. Concomitantly, not only activation of aquaporin-2 but also those of V2R, V1aR, renin, and endothelin-1 in the kidney were significantly suppressed (all P<0.05).CONCLUSIONS:
These results indicate that chronic tolvaptan treatment has beneficial effects by preventing not only the progression of LV dysfunction but also that of renal injury in hypertensive rats with HF. The underlying mechanism may be related to the suppression of myocardial and renal neurohumoral activation.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Benzazepinas
/
Disfunção Ventricular Esquerda
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Antagonistas dos Receptores de Hormônios Antidiuréticos
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Insuficiência Cardíaca
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Antagonistas de Hormônios
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Hipertensão
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Nefropatias
Tipo de estudo:
Diagnostic_studies
/
Etiology_studies
/
Prognostic_studies
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article