Vioxx Research Today is a free monthly online journal that collates and summarizes the latest research about Vioxx, including details on osteoarthritis, side-effects, trials, stroke, heart attack.

In vivo endothelial interaction between ACE and COX inhibitors.

Gryglewski RJ, Chlopicki S, Swies J

Jagiellonian Medical Research Centre, Department of Experimental Pharmacology, Jagiellonian University, Poland 17 Slawkowska, 31-016 Cracow, Poland. mfgrygle@cyf-kr.edu.pl

Here we studied the mechanism of thrombolytic response (THR) induced by angiotensin converting enzyme (ACE-I) in vivo in anaesthetised Wistar rats with extracorporeal circulation. Intravenous injections of ACE-Is, i.e. perindopril or quinapril at non-hypotensive doses of 3-30 microg kg(-1) produced a dose-dependent thrombolysis that was associated with a parallel rise in arterial blood levels of 6-keto-PGF(1 alpha), but not those of TXB(2) or PGE(2). L-NAME at a dose of 5 mg kg(-1) affected significantly neither ACE-I-induced thrombolysis nor prostacyclinemia; however, the pre-treatment with icatibant (0.1-0.5 mg kg(-1)) abolished both effects. The selective COX-1 inhibitor, SC 560 (100-300 microg kg(-1) i.v.), or a would be selective COX-3 inhibitor--paracetamol (acetaminophen, 1-3 mg kg(-1)), both agents induced a transient thrombolysis and slightly potentiated thrombolysis by ACE-Is. In contrast, selective COX-2 inhibitors (rofecoxib>>celecoxib>nimesulide>NS 398) were thrombogenic, and abolished THR and rise in 6-keto-PGF(1 alpha) induced by ACE-Is. Summing up, in our in vivo bioassay system ACE-Is such as quinapril, perindopril or captopril at non-hypotensive doses evoke THR that is mediated by endogenous bradykinin and prostacyclin derived from endothelial COX-2.

Published 31 December 2004 in Prostaglandins Leukot Essent Fatty Acids, 72(2): 129-31.
Full-text of this article is available online (may require subscription).

© 2004-2008 Vioxx Research Today. All Rights Reserved.