PMID: 15253105Jul 16, 2004Paper

Renal protective role of bradykinin B1 receptor in stroke-prone spontaneously hypertensive rats

Hypertension Research : Official Journal of the Japanese Society of Hypertension
Makoto HagiwaraKazuaki Shimamoto

Abstract

The kallikrein-kinin system plays important roles in blood pressure regulation, metabolism of electrolytes and organ protection. Although the bradykinin B2 receptor (B2R) has been reported to be involved in most of these effects, a role of the bradykinin B1 receptor (B1R) has also been noted recently. The aim of this study was to determine the role of renal B1R in stroke-prone spontaneously hypertensive rats (SHR-SP). Sixteen-week-old SHR-SP and Wistar Kyoto rats (WKY) as a control were used in the experiments. A high level of B1R mRNA was detected in SHR-SP, while the expression in WKY was almost undetectable. Immunohistochemistry revealed a B1R protein in the renal tubules and glomeruli in SHR-SP. The acute injection of a B1 R agonist into SHR-SP increased urinary NOx excretion to a level up to 5-fold higher than that in the SHR-SP treated with vehicle. The infusion of B1 R antagonist for 4 weeks resulted in a significant elevation of blood pressure and urinary albumin excretion and a decrease in urinary NOx excretion in SHR-SP. The administration of B1 R antagonist resulted in renal interstitial and glomerular fibrosis in SHR-SP. Moreover, the expressions of transforming growth factor (TGF) beta1 protein and collagen III mRN...Continue Reading

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