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Am J Physiol Renal Physiol 295: F1512-F1518, 2008. First published September 10, 2008; doi:10.1152/ajprenal.00058.2008
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Intrarenal RAS activity and urinary angiotensinogen excretion in anti-thymocyte serum nephritis rats

Naro Ohashi,1 Tatsuo Yamamoto,1,3 Yanjie Huang,1 Taro Misaki,1 Hirotaka Fukasawa,1 Hiroyuki Suzuki,1 Akashi Togawa,1 Sayuri Suzuki,1,2 Yoshihide Fujigaki,1 Tsutomu Nakagawa,4 Yukio Nakamura,4 Fumiaki Suzuki,4 Masatoshi Kitagawa,2 and Akira Hishida1

1First Department of Medicine and 2Department of Biochemistry 1, Hamamatsu University School of Medicine, and 3Faculty of Health Promotional Sciences, Hamamatsu University, Hamamatsu; and 4Faculty of Applied Biological Science, Gifu University, Gifu, Japan

Submitted 3 February 2008 ; accepted in final form 26 August 2008

The differential roles of circulating and intrarenal renin-angiotensin system (RAS) in glomerulonephritis have not been elucidated. In this study, we investigated the levels of circulating and intrarenal RAS activity and urinary angiotensinogen (AGT) excretion in anti-thymocyte serum (ATS) nephritis induced by an ATS injection (ATS group). The effect of olmesartan, an angiotensin II (ANG II) type 1 receptor blocker (ARB), on the development of nephritis was also examined (ATS+ARB group). In addition, the rats received a saline injection instead of ATS (control group). Mesangial proliferation with transient proteinuria, which peaked at day 7, was significantly increased in the ATS group compared with the control group. The levels of glomerular AGT mRNA, intrarenal ANG II, and urinary AGT excretion in the ATS group were increased significantly at day 7 compared with the control group. Administration of olmesartan (ATS+ARB group) significantly decreased the levels of renal lesions, proteinuria, and intrarenal RAS activity compared with the ATS group. In addition, the levels of urinary AGT excretion correlated with the levels of glomerular damage, urinary protein excretion, and immunoreactivity for AGT and ANG II in kidney. On the other hand, plasma renin activity was significantly lower in the ATS group compared with the control group and significantly higher in the ATS+ARB group than in the ATS group. These data suggest that an increase in kidney-specific RAS activity, which parallels urinary AGT excretion, plays an important role in the development of ATS nephritis.

circulating RAS; kidney-specific RAS; mesangial proliferative glomerulonephritis


Address for reprint requests and other correspondence: N. Ohashi, Dept. of Physiology and Hypertension and Renal Center of Excellence Tulane Univ. Health Sciences Center, 1430 Tulane Ave., SL39/M720, New Orleans, LA 70112-2699 (e-mail: nohashi{at}tulane.edu)






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