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      β-Migrating Very Low Density Lipoprotein Attenuates Endothelium-Dependent Relaxation in Rabbit Atherosclerotic Aortas

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          Abstract

          We studied the effects of β-migrating very low density lipoprotein (β-VLDL) on the vascular responses of isolated thoracic aortic preparations taken from normal and hypercholesterolemic rabbits. The endothelium-dependent relaxation induced by acetylcholine or adenosine triphosphate (ATP) was attenuated in the arteries from hypercholesterolemic rabbits that were fed a cholesterol-rich diet for 12 weeks. In these aortas, the lesional circumference of the atherosclerotic plaques (fatty streaks) was only 12.18 ± 1.98 %. The relaxation induced by the Ca<sup>2+</sup> ionophore A23187 or nitroglycerin was not altered. Preincubation with β-VLDL significantly inhibited the relaxation due to acetylcholine, ATP, or A23187, especially in the aortas of hypercholesterolemic rabbits. However, β-VLDL did not alter the response to nitroglycerin. Preincubation with high density lipoprotein had no significant effect on vessel relaxation. These results indicated that endothelium-dependent relaxation was already inhibited in the early stages of atherosclerosis, and that the atherogenic lipoprotein, β -VLDL, further inhibited endothelium-dependent relaxation in atherosclerotic aortas. It may be that β -VLDL also plays a role in determining the level of vascular tonus in atherosclerosis.

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          Author and article information

          Journal
          JVR
          J Vasc Res
          10.1159/issn.1018-1172
          Journal of Vascular Research
          S. Karger AG
          1018-1172
          1423-0135
          1989
          1989
          23 September 2008
          : 26
          : 5
          : 290-299
          Affiliations
          Departments of aGeriatrics and b Pharmacology, Nagoya University School of Medicine, Nagoya, Japan
          Article
          158778 Blood Vessels 1989;26:290–299
          10.1159/000158778
          00550d84-e1f1-4ea6-a12b-f17bab0fd1fa
          © 1989 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.

          History
          : 11 April 1989
          : 20 October 1989
          Page count
          Pages: 10
          Categories
          Research Paper

          General medicine,Neurology,Cardiovascular Medicine,Internal medicine,Nephrology
          Endothelium-derived relaxant factors,β-Migrating very low density lipoprotein,Atherosclerosis,Endothelium-dependent relaxation

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