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Journal of Histochemistry and Cytochemistry, Vol. 45, 875-882, Copyright © 1997 by The Histochemical Society, Inc.

ARTICLE

Immunohistochemical Localization of Arginine and Citrulline in Rat Renal Tissue

Eiko Aokia and Ikuo K. Takeuchia
a Department of Embryology, Institute for Developmental Research, Aichi Human Service Center, Kasugai, Aichi, Japan

Correspondence to: Eiko Aoki, Dept. of Embryology, Inst. for Developmental Research, Aichi Human Service Center, Kasugai, Aichi 480-03, Japan.

Using antibodies highly specific for L-arginine and L-citrulline, we localized these amino acids in rat kidney with immunohistochemical methods. Highest levels of arginine immunoreactivity were observed in epithelial cells of proximal tubules in the outer stripe of the outer medulla and the collecting ducts in the cortex. Staining intensity of proximal convoluted tubules in the outer stripe decreased from the inner side to the outer side. In the inner medulla, collecting ducts were labeled with moderate intensity. Staining within the cortex was apparent only with collecting ducts. Citrulline immunoreactivity was localized in the epithelial cells of collecting ducts both in the cortex and medulla. Immunoreactivity was also found in glomerular podocytes and in the epithelial cells of proximal convoluted tubules in the outer medulla. These localizations were different from those of other amino acids previously reported. The precise cellular distribution of arginine and citrulline in rat kidney was determined for the first time by an immunohistochemical method in the present study. (J Histochem Cytochem 45:875-881, 1997)

Key Words: amino acid, arginine, citrulline, kidney, immunohistochemistry, renal tubules


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