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Originally published online as doi:10.2353/ajpath.2007.060484 on April 6, 2007

Published online before print April 6, 2007
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(American Journal of Pathology. 2007;170:1841-1853.)
© 2007 American Society for Investigative Pathology
DOI: 10.2353/ajpath.2007.060484

Angiotensin II Type 1 and Type 2 Receptors Play Opposite Roles in Regulating the Barrier Function of Kidney Glomerular Capillary Wall

Koichi Suzuki*{dagger}, Gi Dong Han*{ddagger}, Naoko Miyauchi*, Taeko Hashimoto*, Takeshi Nakatsue*, Yumiko Fujioka*, Hiroko Koike*, Fujio Shimizu* and Hiroshi Kawachi*

From the Department of Cell Biology,* Institute of Nephrology, Niigata University Graduate School of Medical and Dental Sciences, Niigata, Niigata, Japan; the Department of Medicine IV,{dagger} Tokyo Women’s Medical University School of Medicine, Tokyo, Japan; and the Department of Food Science and Technology,{ddagger} Yeungnam University, Gyeongsan, Republic of Korea

Although angiotensin II (Ang II) type 1 receptor antagonist ameliorates proteinuria, its pharmacological mechanism and the differential roles of Ang II type 1 receptor (AT1R) and type 2 receptor (AT2R) are not well understood. We analyzed the effect of Ang II type 1 receptor antagonist on proteinuria caused by antibody against nephrin, a functional molecule of glomerular slit diaphragm and dysfunction of which is involved in the development of proteinuria in several glomerular diseases. We show here that AT1R antagonist ameliorated proteinuria by preventing a reduction in the functional molecules of the slit diaphragm. We also analyzed the role of AT1R- or AT2R-mediated actions on the expression of the slit diaphragm molecules in an in vivo study of normal rat and in an in vitro study of cultured podocytes. AT1R-mediated action hampered the mRNA expression of the slit diaphragm molecules, whereas AT2R-mediated action enhanced it. These findings indicate that Ang II receptor subtypes play opposite roles in regulating the barrier function of glomerular capillary wall and that the enhancement of AT2R stimulation may serve as a potential therapeutic strategy for proteinuria.




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