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      Effects of an Endothelin Receptor Antagonist on a Model of Hypertensive Retinopathy

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          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          Hypertensive retinopathy manifests itself as progressive retinal microvascular pathology in response to aberrant blood flow. The current study sought to evaluate whether dysfunction of the vasoactive endothelin-1 (ET-1) system is involved in the pathogenesis of hypertension-induced retinopathy in an animal model of systemic hypertension. The endothelin receptor antagonist, bosentan, was administered to spontaneously hypertensive rats (SHRs) and comparisons were made with untreated SHRs and normotensive Wistar Kyoto (WKY) rats. The retinal mRNA expression of ET-1, ET-converting enzyme-1, ET<sub>A</sub> and ET<sub>B</sub> receptors and the basement membrane proteins, laminin β1, collagen IV and fibronectin was quantified using real-time RT-PCR. In addition, retinal arteriole and/or capillary bed damage was assessed by qualitative and quantitative microscopy. mRNA for the ET<sub>A</sub> receptor was increased in SHRs, when compared to WKY control animals (p < 0.001). Treatment with bosentan in SHRs significantly reduced the expression of ET-1 (p < 0.05), and both the ET<sub>A</sub> (p < 0.0001) and ET<sub>B</sub> (p < 0.05) receptor subtypes. The laminin β1, collagen IV and fibronectin mRNA expression was significantly higher in SHRs when compared to WKY control animals (p < 0.001). Treatment with bosentan abolished these responses and also the appearance of various microvascular lesions. ET-mediated vasoregulation abnormalities in the retinal microvasculature could play an associative role in lesion formation during hypertensive retinopathy.

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          Cloning and expression of a cDNA encoding an endothelin receptor.

          H. Arai, Yusuke Hori, I Aramori … (2015)
          Endothelins are a newly described peptide family consisting of three peptides (ET-1, ET-2 and ET-3) which are the most potent vasoconstrictive peptides known. They are crucial in the regulation of vascular smooth muscle tone. The diverse functions of endothelins are thought to be mediated by interaction with many different receptors coupled to the inositol phosphate/calcium ion messenger pathway. However, because of the structural resemblance of the three peptides, the presence and nature of multiple endothelin receptors remain to be elucidated. We report here the cloning of a complementary DNA encoding a bovine endothelin receptor, which has a transmembrane topology similar to that of other G protein-coupled receptors and shows specific binding, with the highest selectivity to ET-1 in animal cells transfected with the cloned cDNA. This receptor messenger RNA is widely distributed in the central nervous system and peripheral tissues, particularly in the heart and lung. Our results support the view that there are other receptor subtypes.
          Article 0 comments Cited 129 times – based on 0 reviews     Review now
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            Vascular Remodeling in Hypertension

            Ernesto Schiffrin, Hope D. Intengan (2001)
            Article 0 comments Cited 96 times – based on 0 reviews     Review now
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              The AGE inhibitor pyridoxamine inhibits development of retinopathy in experimental diabetes.

              Alan W. Stitt, Thomas Gardiner, Nathan L Alderson … (2002)
              We examined the ability of pyridoxamine (PM), an inhibitor of formation of advanced glycation end products (AGEs) and lipoxidation end products (ALEs), to protect against diabetes-induced retinal vascular lesions. The effects of PM were compared with the antioxidants vitamin E (VE) and R-alpha-lipoic acid (LA) in streptozotocin-induced diabetic rats. Animals were given either PM (1 g/l drinking water), VE (2,000 IU/kg diet), or LA (0.05%/kg diet). After 29 weeks of diabetes, retinas were examined for pathogenic changes, alterations in extracellular matrix (ECM) gene expression, and accumulation of the immunoreactive AGE/ALE N( epsilon )-(carboxymethyl)lysine (CML). Acellular capillaries were increased more than threefold, accompanied by significant upregulation of laminin immunoreactivity in the retinal microvasculature. Diabetes also increased mRNA expression for fibronectin (2-fold), collagen IV (1.6-fold), and laminin beta chain (2.6-fold) in untreated diabetic rats compared with nondiabetic rats. PM treatment protected against capillary drop-out and limited laminin protein upregulation and ECM mRNA expression and the increase in CML in the retinal vasculature. VE and LA failed to protect against retinal capillary closure and had inconsistent effects on diabetes-related upregulation of ECM mRNAs. These results indicate that the AGE/ALE inhibitor PM protected against a range of pathological changes in the diabetic retina and may be useful for treating diabetic retinopathy.
              Article 0 comments Cited 60 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (publisher-id): ORE
                Journal ID (nlm-ta): Ophthalmic Res
                Journal ID (doi): 10.1159/issn.0030-3747
                Title: Ophthalmic Research
                Publisher: S. Karger AG
                ISSN (Print): 0030-3747
                ISSN (Electronic): 1423-0259
                Publication date Subscription-year: 2010
                Publication date (Print): January 2010
                Publication date (Electronic): 15 October 2009
                Volume: 43
                Issue: 2
                Pages: 99-107
                Affiliations
                Centre for Vision and Vascular Science, Queen’s University Belfast, Belfast, Northern Ireland
                Article
                Publisher ID: 247594 Other ID: Ophthalmic Res 2010;43:99–107
                DOI: 10.1159/000247594
                PubMed ID: 19829016
                SO-VID: d4aedb5b-f725-46ea-9acd-fb55c7be61e6
                Copyright © © 2009 S. Karger AG, Basel
                License:

                Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

                History
                Date received : 21 January 2009
                Date accepted : 01 May 2009
                Page count
                Figures: 4, References: 53, Pages: 9
                Categories
                Subject: Original Paper

                ScienceOpen disciplines: Vision sciences,Ophthalmology & Optometry,Pathology
                Keywords: Bosentan,Microvasculature,Retina,Hypertensive retinopathy,Endothelin
                Data availability:
                ScienceOpen disciplines: Vision sciences, Ophthalmology & Optometry, Pathology
                Keywords: Bosentan, Microvasculature, Retina, Hypertensive retinopathy, Endothelin

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