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Cellular Distribution and Function of Soluble Guanylyl Cyclase in Rat Kidney and Liver

FRANZISKA THEILIG^*, MAGDALENA BOSTANJOGLO^*, HERMANN PAVENSTÄDT, CLEMENS GRUPP, GUDRUN HOLLAND^*, ILKA SLOSAREK^*, AXEL M. GRESSNER, MICHAEL RUSSWURM^||, DORIS KOESLING^|| and SEBASTIAN BACHMANN^*

^* Department of Anatomy, Charité, Humboldt University, Berlin, Germany
Department of Nephrology, University of Freiburg, Freiburg, Germany
Department of Nephrology, University of Göttingen, Göttingen, Germany
Department of Clinical Chemistry, Rheinisch-Westfälische Technische Hochschule Aachen, Aachen, Germany
^|| Department of Pharmacology, Ruhr University, Bochum, Germany.

Correspondence to Dr. Sebastian Bachmann, AG Anatomie/Elektronenmikroskopie, Charité CVK, BMFZ, Augustenburger Platz 1, D-13353 Berlin, Germany. Phone: +49-30-450-528-411; Fax: +49-30-450-528-922; E-mail: sbachm{at}charite.de

Abstract. Soluble guanylyl cyclase (sGC) catalyzes the biosynthesis of cGMP in response to binding of L-arginine-derived nitric oxide (NO). Functionally, the NO-sGC-cGMP signaling pathway in kidney and liver has been associated with regional hemodynamics and the regulation of glomerular parameters. The distribution of the ubiquitous sGC isoform 1ß1 sGC was studied with a novel, highly specific antibody against the ß1 subunit. In parallel, the presence of mRNA encoding both subunits was investigated by using in situ hybridization and reverse transcription-PCR assays. The NO-induced, sGC-dependent accumulation of cGMP in cytosolic extracts of tissues and cells was measured in vitro. Renal glomerular arterioles, including the renin-producing granular cells, mesangium, and descending vasa recta, as well as cortical and medullary interstitial fibroblasts, expressed sGC. Stimulation of isolated mesangial cells, renal fibroblasts, and hepatic Ito cells with a NO donor resulted in markedly increased cytosolic cGMP levels. This assessment of sGC expression and activity in vascular and interstitial cells of kidney and liver may have implications for understanding the role of local cGMP signaling cascades.

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