Abstract:
BACKGROUND AND METHODS:We investigated kidney function, renal endothelin-1 concentration, prepro-endothelin-1 mRNA as well as endothelin receptor A and B mRNA expression and receptor properties in normotensive Wistar-Kyoto (WKY) rats and spontaneously hypertensive rats (SHR) with intact renal nerves and 7 days after renal denervation. In addition, responses of renal function to the non-selective ETA/ETB receptor blocker bosentan (10 mg/kg i.v. bolus injection) were studied. RESULTS:In SHR, renal papillary prepro-endothelin-1 mRNA expression, endothelin-1 tissue concentrations and endothelin receptor density were significantly lower than in normotensive rats. Renal denervation was associated with a decrease in papillary tissue prepro-endothelin-1 mRNA and in WKY rats also with a significant reduction in papillary endothelin-1 content without affecting ET receptor density. Bosentan did not alter renal blood flow or glomerular filtration rate but decreased urine flow rate in both intact normotensive and hypertensive rats, whereas it decreased urine sodium and potassium excretion only in intact WKY. Bosentan had no effects on renal function in renal denervated rats. CONCLUSION:Since renal papillary endothelin-1 appears to counteract the fluid and sodium retaining effects of renal nerve activity, an impaired renal endothelin-1 synthesis in SHR may contribute to excessive sodium retention and thus to the pathogenesis of hypertension in SHR.
journal_name
Kidney Blood Press Resjournal_title
Kidney & blood pressure researchauthors
Girchev RA,Bäcker A,Markova PP,Kramer HJdoi
10.1159/000094571subject
Has Abstractpub_date
2006-01-01 00:00:00pages
126-34issue
2eissn
1420-4096issn
1423-0143pii
94571journal_volume
29pub_type
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