Endothelin receptor blockade does not affect blood pressure or angiotensin II levels in CYP1A1-Ren-2 transgenic rats with acutely induced hypertension.
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| Abstract |
We found previously that selective blockade of endothelin ETA receptors is superior to nonselective ET(A)/ET(B) in attenuating hypertension and survival rate in Ren-2 transgenic rats (TGR). In the present pilot study, we were interested in whether similar effects will be found in TGR with inducible malignant hypertension (iTGR; official strain name Cyp1A1-Ren-2rats), which were derived from the original Ren-2 transgenic rat strain. Studies were performed in three-month old male iTGR. Treatment with either bosentan, a non-selective ET(A)/ET(B), or with atrasentan, a selective ET(A) receptor blocker, was started on day 2 of the experiment. Feeding with indole-3-carbinole (13C; 03% in rat chow), a natural xenobiotic which activates the Cyplal promoter of the mouse Ren-2 gene, began on day 3 and lasted for 4 days until day 6. Systolic BP, body weight, plasma ANG II and tissue ANG II and ET-1 concentrations were determined daily. Severe hypertension developed as early as 1 day after beginning of 13C feeding which was accompanied by a significant reduction in body weight and by increases in plasma and tissue ANG II and left ventricle ET-1 concentrations. Atrasentan or bosentan had no effects on the rise in BP or plasma and tissue ANG II concentrations but prevented the rise in heart ventricle ET-1 concentration. Our data show that blockade of the ET system does not prevent or attenuate the rapid development of severe hypertension in iTGR; a long-term protective effect of ET blockade on cardiac (and renal) damage, however, cannot be excluded and awaits further investigations.
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| Authors | Zdenka Vanourková, Herbert J Kramer, Michaela Erbanová, Angela Bäcker, Ludek Cervenka, Zuzana Husková, Vera Certíková Chábová, Vladimír Tesar, Pavel Dvorák, Jan Malý, Ivana Vanecková |
| Journal | Vascular pharmacology (Vascul Pharmacol) 2009 May-Jun Vol. 50 Issue 5-6 Pg. 194-9 ISSN: 1879-3649 [Electronic] United States |
| PMID | 19563737 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't) |
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