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Second Department of Internal Medicine, Faculty of Medicine, Kyushu University, Faculty of Medicine, Fukuoka, Japan.
Correspondence to Dr. Minoru Kashiwagi, Second Department of Internal Medicine, Faculty of Medicine, Kyushu University, Maidashi 3-1-1, Higashiku, Fukuoka, 812-8582, Japan. Phone: +81 92 642 5256; Fax: +81 92 642 5271; E-mail: kashi{at}intmed2.med.kyushu-u.ac.jp
Abstract. Chronic inhibition of nitric oxide synthase (NOS) is
known to cause renal parenchymal injury with systemic hypertension. To
elucidate the pathogenetic mechanism in renal damage induced by NOS
inhibition, N
-nitro-L-arginine methyl ester
(L-NAME) was given orally for 12 wk in Wistar rats, and the roles of tissue
renin-angiotensin system and transforming growth factor-ß1 (TGF-ß1)
were investigated. BP and urinary protein excretion increased significantly in
L-NAME rats compared with control rats, and glomerulosclerosis and
interstitial fibrosis developed. In L-NAME rats, the cortical tissue levels of
angiotensin-converting enzyme activity and angiotensin II were significantly
higher than those in control rats. The cortical mRNA expressions of both
TGF-ß1 and fibronectin were significantly elevated in L-NAME rats.
Immunohistochemically, increased expressions of both fibronectin and
-smooth muscle actin were also revealed in L-NAME rats. In L-NAME rats,
these histologic injuries and the increased expression of TGF-ß1 were
equally emeliorated by either angiotensin-converting enzyme inhibitor or
angiotensin II type 1 receptor antagonist, but not by hydralazine. In
conclusion, the locally activated renin-angiotensin system in connection with
the increased TGF-ß1 expression is a major pathogenetic feature of renal
injury in chronically NOS-inhibited rats.
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