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Hypertension. 1999;33:389-395

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(Hypertension. 1999;33:389-395.)
© 1999 American Heart Association, Inc.


Scientific Contributions

Monocyte Infiltration and Adhesion Molecules in a Rat Model of High Human Renin Hypertension

Eero M. A. Mervaala; Dominik N. Müller; Joon-Keun Park; Folke Schmidt; Matthias Löhn; Volker Breu; Duska Dragun; Detlev Ganten; Herman Haller; Friedrich C. Luft

From Franz Volhard Clinic, Medical Faculty of the Charite', Humboldt University of Berlin (Germany) (E.M.A.M., D.N.M., J.-K.P., F.S., M.L., D.D., H.H., F.C.L.); the Institute of Biomedicine, University of Helsinki (Finland) (E.M.A.M.); Max Delbrück Center for Molecular Medicine, Berlin, Germany (J.-K.P., M.L., D.G., F.C.L.); Hoffmann-La Roche, Basel, Switzerland (V.B.); and Institute for Clinical Pharmacology, Benjamin Franklin University Hospital, Free University of Berlin (Germany) (D.G.).

Correspondence to Friedrich C. Luft, Franz Volhard Clinic, Wiltberg Strasse 50, 13125 Berlin, FRG. E-mail luft{at}fvk-berlin.de

Abstract—Hypertension and kidney damage in the double transgenic rat (dTGR) harboring both human renin and human angiotensinogen genes are dependent on the human components of the renin angiotensin system. We tested the hypothesis that monocyte infiltration and increased adhesion molecule expression are involved in the pathogenesis of kidney damage in dTGR. We also evaluated the effects of long-term angiotensin-converting enzyme (ACE) inhibition, AT1 blockade, and human renin inhibition on monocyte recruitment and inflammatory response in dTGR. Systolic blood pressure and 24-hour albuminuria were markedly increased in 7-week-old dTGR as compared with age-matched normotensive Sprague Dawley rats. We found a significant monocyte/macrophage infiltration in the renal perivascular space and increased expression of intercellular adhesion molecule-1 (ICAM-1) and vascular cell adhesion molecule-1 (VCAM-1) in the interstitium, intima, and adventitia of the small renal vessels. {alpha}Lß2 integrin and {alpha}4ß1 integrin, the corresponding ligands for ICAM-1 and VCAM-1, were also found on infiltrating monocytes/macrophages. The expression of plasminogen activator inhibitor-1 and fibronectin in the kidneys of dTGR were increased and distributed similarly to ICAM-1. In 4-week-old dTGR, long-term treatment with ACE inhibition (cilazapril), AT1 receptor blockade (valsartan), and human renin inhibition (RO 65-7219) (each drug 10 mg/kg by gavage once a day for 3 weeks) completely prevented the development of albuminuria. However, only cilazapril and valsartan were able to decrease blood pressure to normotensive levels. Interestingly, the drugs were all equally effective in preventing monocyte/macrophage infiltration and the overexpression of adhesion molecules, plasminogen activator inhibitor-1, and fibronectin in the kidney. Our findings indicate that angiotensin II causes monocyte recruitment and vascular inflammatory response in the kidney by blood pressure–dependent and blood pressure–independent mechanisms. ACE inhibition, AT1 receptor blockade, and human renin inhibition all prevent monocyte/macrophage infiltration and increased adhesion molecule expression in the kidneys of dTGR.


Key Words: angiotensin II • intercellular adhesion molecule-1 • vascular cell adhesion molecule-1 • plasminogen activator inhibitor-1 • fibronectin • renin




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