(Circulation. 2002;105:627.)
© 2002 American Heart Association, Inc.
Basic Science Reports |
From the Institut National de la Santé et de la Recherche Médicale INSERM U 388, Institut Louis Bugnard, CHU Rangueil, Toulouse, France.
Correspondence to J.P. Girolami, INSERM U388, Institut Louis Bugnard, CHU Rangueil, 31403 Toulouse Cedex, France. E-mail girolami{at}toulouse.inserm.fr
Background The physiological effects of ACE inhibitors may act in part through a kinin-dependent mechanism. We investigated the effect of chronic ACE-inhibitor treatment on functional kinin B1- and B2-receptor expression, which are the molecular entities responsible for the biological effects of kinins.
Methods and Results Rats were subjected to different 6-week treatments using various mixtures of the following agents: ACE inhibitor, angiotensin AT1-receptor antagonist, and B1- and B2-receptor antagonists. Chronic ACE inhibition induced both renal and vascular B1-receptor expression, whereas B2-receptor expression was not modified. Furthermore, with B1-receptor antagonists, it was shown that B1-receptor induction was involved in the hypotensive effect of ACE inhibition. Using microdissection, we prepared 10 different nephron segments and found ACE-inhibitorinduced expression of functional B1-receptors in all segments. ACE-inhibitorinduced B1-receptor induction involved homologous upregulation, because it was prevented by B1-receptor antagonist treatment. Finally, using B2-receptor knockout mice, we showed that ACE-inhibitorinduced B1-receptor expression was B2-receptor independent.
Conclusions This study provides the first evidence that chronic ACE-inhibitor administration is associated with functional vascular and renal B1-receptor induction, which is involved in ACE-inhibitorinduced hypotension. The observed B1-receptor induction in the kidney might participate in the known renoprotective effects of ACE inhibition.
Key Words: angiotensin-converting enzyme bradykinin kidney blood pressure
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