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      Morphological Analysis of Iodoacetic Acid-Induced Cataract in the Rat

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          Abstract

          Purpose: To clarify the mechanism underlying the development of cataract in the rat lens after intraperitoneal administration of iodoacetic acid (IAA). Methods: (1) The 2% IAA dissolved in saline solution was injected at a dose of 40 mg/kg body weight into the rat peritoneal cavity. The retina and lens were intermittently extirpated and were examined by light and electron microscopy. (2) Two kinds of tracer, Evans blue (EB) and horseradish peroxidase (HRP), were injected into the tail veins and anterior chamber, and were observed with dissecting and electron microscopes. Results: (1) Four weeks after administration, a part of the lens epithelium at the lateral side of the lens was degenerated, and the lens nucleus developed faint turbidity after 8 weeks. After 16 weeks, the nuclear turbidity could not be observed because mild cortical opacity was developing. The epithelial degeneration recovered from around 12 weeks, and instead of spherical nuclei, elliptical nuclei appeared. (2) The EB dye injected into the tail vein significantly stained the ciliary body, where the anterior and posterior ciliary arteries anastomosed. EB injected from the lateral side of the lens was seen to move towards the lens nucleus. Electron microscopically, the epithelial degeneration of the ciliary body was observed. The incorporated HRP substance was found in the cytoplasm of the nonpigmented cells of the ciliary epithelium at an early stage after IAA administration. Conclusion: IAA injected intravenously first developed epithelial degeneration at the lateral side of the lens. This change induced swelling of the lens fibers in the lens nucleus. Recovered epithelial cells had a transformed nucleus, and in turn the cortical cataract was induced by a differentiation disorder of the lens fibers. These results indicate that the breakdown of the blood-aqueous barrier in the nonpigmented epithelium of the ciliary body is a trigger to cause the cataract. The IAA-induced cataract may be useful as an animal model of human age-related cataract.

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          Author and article information

          Journal
          ORE
          Ophthalmic Res
          10.1159/issn.0030-3747
          Ophthalmic Research
          S. Karger AG
          0030-3747
          1423-0259
          2002
          June 2002
          28 June 2002
          : 34
          : 3
          : 119-127
          Affiliations
          Departments of aOphthalmology and bOphthalmic Anatomy and Physiology, Graduate School of Medical Sciences, Kitasato University, Sagamihara, Kanagawa, Japan
          Article
          63654 Ophthalmic Res 2002;34:119–127
          10.1159/000063654
          12097793
          © 2002 S. Karger AG, Basel

          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.

          Page count
          Figures: 4, References: 10, Pages: 9
          Categories
          Original Paper

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