Angiotensin II type 1 receptor localizes at the blood–bile barrier in humans and pigs
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Published:2022-02-28
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ISSN:0948-6143
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Container-title:Histochemistry and Cell Biology
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language:en
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Short-container-title:Histochem Cell Biol
Author:
Pryymachuk GalynaORCID, El-Awaad EhabORCID, Piekarek NadinORCID, Drebber UtaORCID, Maul Alexandra C.ORCID, Hescheler JuergenORCID, Wodarz AndreasORCID, Pfitzer GabrieleORCID, Neiss Wolfram F.ORCID, Pietsch MarkusORCID, Schroeter Mechthild M.ORCID
Abstract
AbstractAnimal models and clinical studies suggest an influence of angiotensin II (AngII) on the pathogenesis of liver diseases via the renin–angiotensin system. AngII application increases portal blood pressure, reduces bile flow, and increases permeability of liver tight junctions. Establishing the subcellular localization of angiotensin II receptor type 1 (AT1R), the main AngII receptor, helps to understand the effects of AngII on the liver. We localized AT1R in situ in human and porcine liver and porcine gallbladder by immunohistochemistry. In order to do so, we characterized commercial anti-AT1R antibodies regarding their capability to recognize heterologous human AT1R in immunocytochemistry and on western blots, and to detect AT1R using overlap studies and AT1R-specific blocking peptides. In hepatocytes and canals of Hering, AT1R displayed a tram-track-like distribution, while in cholangiocytes AT1R appeared in a honeycomb-like pattern; i.e., in liver epithelia, AT1R showed an equivalent distribution to that in the apical junctional network, which seals bile canaliculi and bile ducts along the blood–bile barrier. In intrahepatic blood vessels, AT1R was most prominent in the tunica media. We confirmed AT1R localization in situ to the plasma membrane domain, particularly between tight and adherens junctions in both human and porcine hepatocytes, cholangiocytes, and gallbladder epithelial cells using different anti-AT1R antibodies. Localization of AT1R at the junctional complex could explain previously reported AngII effects and predestines AT1R as a transmitter of tight junction permeability.
Funder
Deutsche Forschungsgemeinschaft German Academic Exchange Service-German Egyptian Research Long-Term scholarship Rottendorf foundation Graduate Program in Pharmacology and Experimental Therapeutics of the University of Cologne and Bayer Healthcare Universitätsklinikum Köln
Publisher
Springer Science and Business Media LLC
Subject
Cell Biology,Medical Laboratory Technology,Molecular Biology,Histology
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1. In focus in HCB;HISTOCHEM CELL BIOL;2022
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