Published Online
on April 25, 2005

A more recent version of this article appeared on June 1, 2005

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Submitted on September 23, 2004
Revised on October 15, 2004

Cyclooxygenase-2 Inhibitors Attenuate Angiotensin II-Induced Oxidative Stress, Hypertension, and Cardiac Hypertrophy in Rats

Rong Wu; Marc-André Laplante; and Jacques de Champlain^*

From the Department of Physiology, University de Montréal, Montréal, Canada.

^* To whom correspondence should be addressed. E-mail: grsna{at}ere.umontreal.ca.

Abstract--Angiotensin II is an important oxidative stress mediator. Our previous studies have indicated that the potent antioxidative properties of acetylsalicylic acid play an important role in its cardiovascular protective effects. There are some ongoing controversies concerning the use of selective cyclooxygenase-2 inhibitors in cardiovascular disease. The aim of this study was to determine whether the cyclooxygenase-2 selective inhibitors rofecoxib and nimesulide possess antioxidative and cardiovascular protective effects against angiotensin II. Chronic subcutaneous angiotensin II infusion increased cardiovascular but not colonic tissue superoxide production, heart/body weight ratio, and blood pressure. Moreover, angiotensin II selectively increased cardiac cyclooxygenase-2 but not cyclooxygenase-1 expression, which was totally prevented by acetylsalicylic acid treatment. Similar to acetylsalicylic acid, rofecoxib or nimesulide treatments significantly attenuated angiotensin II-induced oxidative stress, hypertension, and cardiac NAD(P)H oxidase subunit p47^phox expression. Rofecoxib also reduced cardiac hypertrophy. Treatment with nonselective anti-inflammatory drugs ibuprofen, indomethacin, or salicylic acid did not show any effect on angiotensin II-induced superoxide production, hypertension, or cardiac hypertrophy. Although acetylsalicylic acid and salicylic acid inhibited angiotensin II-induced nuclear factor B (NF-B) activation, nimesulide did not modify NF-B activation. In conclusion, cyclooxygenase-2 pathway is implicated in angiotensin II-induced oxidative stress and deleterious cardiovascular changes. Rofecoxib and nimesulide produced significant antioxidative effect by reducing NAD(P)H oxidase-dependent superoxide generation. These effects seem to be independent of NF-B inhibition.

Key words: cyclooxygenase • oxidative stress • angiotensin II • free radicals • hypertension, experimental

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