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      Tear Nitrite and Nitrate Levels as Nitric Oxide End Products in Patients with Behçet’s Disease and Non-Behçet’s Uveitis

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          Abstract

          To evaluate the role of nitric oxide (NO) in ocular inflammation, tear nitrite and nitrates (NN) as NO end products were determined in 11 patients with Behçet’s disease (BD) and in 11 with non-Behçet’s uveitis (NBU) during the active and remission stages and in 12 healthy controls. Median (with the range) NN levels were 82.29 (59.60–98.25) µmol/l in the active and 98.25 (52.88–246.92) µmol/l in the remission stage of BD; 88.17 (25.99–116.73) µmol/l in the active and 83.00 (31.04–250.28) µmol/l in the remission stage of NBU and 109.17 (88.17–158.74) µmol/l in the controls. The NN levels in the active stage of BD and NBU were significantly decreased when compared to the controls (p < 0.05; Kruskal-Wallis test). Decreased NN levels at the activation stage may be caused by the rapid transformation of the NO to peroxynitrites, which are highly oxidizing and cytotoxic substances.

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          Criteria for diagnosis of Behcet's disease

          INTERNATIONALSTUDYGROUPFORBEHC (1990)
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            Effects of nitric oxide synthase inhibitor on intraocular pressure and ocular inflammation following laser irradiation in rabbits.

            T Taniguchi, Y Kitazawa, A Sawada … (1998)
            To examine the effects of nitric oxide synthase (NOS) inhibitors on intraocular pressure (IOP) and ocular inflammation following laser irradiation of the rabbit iris, and to investigate the involvement of nitric oxide (NO). Thirty min after the intravenous administration of a nonselective inhibitor of NOS, N omega-nitro-L-arginine methyl ester (L-NAME, 1-100 mg/kg), or a selective inhibitor of iNOS, aminoguanidine (AG, 100 mg/kg), Q-switched Nd:YAG laser irradiation was applied to the iris of albino rabbits at an energy level of 48 mJ. IOP was measured prior to and for 24 h after irradiation. In separate groups of rabbits, aqueous humor was withdrawn 30 min after irradiation to determine protein and prostaglandin (PG) E2 concentrations. Intravenously administered L-NAME dose-dependently inhibited the acute increase in IOP, the peak of which was observed at 30 min, following laser irradiation. The IOP increase was completely abolished by 100 mg/kg of L-NAME. This dose of L-NAME significantly reduced the elevation of protein concentration in aqueous humor following irradiation; however, this dose failed to affect the increase in PGE2 concentration On the other hand, the inhibitory effects of AG (100 mg/kg) on the increase in IOP and aqueous protein following laser irradiation were not significant. Intravenous administration of L-NAME significantly inhibits the IOP rise and the increase in protein concentration in aqueous humor following laser irradiation, but AG does not, suggest the involvement of cNOS in these ocular responses to laser irradiation.
            Article 0 comments Cited 5 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: 2001
              Publication date (Print): February 2001
              Publication date (Electronic): 13 December 2000
              Volume: 33
              Issue: 1
              Pages: 48-51
              Affiliations
              Departments of aOphthalmology and bBiochemistry, Faculty of Medicine, Erciyes University, Kayseri, Turkey
              Article
              Publisher ID: 55641 Other ID: Ophthalmic Res 2001;33:48–51
              DOI: 10.1159/000055641
              PubMed ID: 11114605
              SO-VID: 8872ed8a-3adb-43e6-b6f4-c46a6ce90308
              Copyright © © 2001 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
              Page count
              Tables: 2, References: 9, Pages: 4
              Categories
              Subject: Original Paper

              ScienceOpen disciplines: Vision sciences,Ophthalmology & Optometry,Pathology
              Keywords: Nitrate,Nitric oxide,Behçet’s disease,Tears,Nitrite
              Data availability:
              ScienceOpen disciplines: Vision sciences, Ophthalmology & Optometry, Pathology
              Keywords: Nitrate, Nitric oxide, Behçet’s disease, Tears, Nitrite

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