(Circulation. 1999;99:2185-2191.)
© 1999 American Heart Association, Inc.
Basic Science Reports |
From INSERM U 489, Paris (P.-L.T., C.C., R.A., J.-C.D.); IURC, Montpellier (D.C.); INSERM U 402, Paris (L.F.); and Service de Physiologie, CHU Saint-Antoine, Paris (J.-C.D.), France.
Correspondence to Jean-Claude Dussaule, MD, PhD, Service de Physiologie, CHU Saint-Antoine, 184 rue du Faubourg Saint-Antoine, 75571 Paris Cedex 12, France. E-mail jean-claude.dussaule{at}sat.ap-hop-paris.fr
BackgroundThe progression of hypertension during NO deficiency is associated with renal vascular fibrosis due to increased extracellular matrix (mainly collagen I) formation. The purpose of the present study was to investigate whether endothelin-1 (ET-1) is involved in this pathophysiological process.
Methods and ResultsTreatment of rats for 4 weeks with the NO
synthase inhibitor
N
-nitro-L-arginine methyl ester
(L-NAME) 50 mg · kg-1 · d-1
increased systolic blood pressure to 159±12 mm Hg. In
animals treated with L-NAME, histological evaluation of
renal sections revealed an increased formation of extracellular matrix
(Masson's trichrome), and specifically of collagens (Sirius red). A
part of this fibrosis was attributed to abnormal collagen I presence,
because mRNA expression of the collagen I
1 chain (reverse
transcriptionpolymerase chain reaction) and procollagen I formation
(radioimmunoassay) were increased 3- and 2.5-fold, respectively, in the
renal resistance vessels of hypertensive animals. In subsequent
experiments, we examined whether ET-1 was involved in activation of
collagen I formation. mRNA expression (RNase protection assay) of
preproET-1 and ET-1 content (radioimmunoassay) were 10-fold and 3-fold
increased, respectively, in renal microvessels of rats treated with
L-NAME. Interestingly, in these vessels, ET-1
(immunostaining) was colocalized with sudanophilic
lesions. Bosentan, an ET receptor antagonist (20 mg
· kg-1 · d-1), coadministered with
L-NAME canceled the increased mRNA expression and synthesis of collagen
I and attenuated the severity of renal vascular lesions without
affecting L-NAMEinduced high blood pressure.
ConclusionsThese data demonstrate that ET-1 synthesis is increased in renal microvessels when NO production is suppressed. In this model of hypertension, ET-1 is a major activator of collagen I formation in renal resistance vessels and participates in the development of renal fibrosis without affecting systolic blood pressure.
Key Words: hypertension nitric oxide endothelin kidney fibrosis
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