We have characterized the dilation response to increased blood flow in the canine femoral and saphenous arteries. An arteriovenous shunt was created and changes in arterial diameter measured by sonomicrometer crystals. Increasing shunt flow approximately 10-fold caused a 9% increase in femoral and 15 % increase in saphenous artery diameter. The dilation response consisted of a transient decrease in diameter, followed by a rapid dilation and a slow return to control when flow was decreased. The increased diameter was not a result of decreased transmural pressure or alterations in pulse pressure. After removing the endothelial cells, the vessels did not dilate to increased flow or topical acetylcholine (10–5
M), but responses to norepinephrine (10–5
M) and sodium nitroprusside (10–4
M) were unaltered. Indomethacin, theophylline or propranolol did not affect the flow-induced dilation. Quinacrine, an inhibitor of phospholipase A2
, attenuated the dilation response in a dose-dependent manner. We conclude that increased blood flow affects endothelial cells, causing an active dilation of arterial smooth muscle.
Lana Kaiser, MD, Department of Physiology, Giltner Hall, Michigan State University, East Lansing, MI 48824-1101 (USA)
Received: June 9, 1985
Accepted: February 18, 1986
Published online: September 23, 2008
Number of Print Pages : 16
Journal of Vascular Research (Incorporating 'International Journal of Microcirculation')
Vol. 23, No. 4-5, Year 1986 (Cover Date: 1986)
Journal Editor: Pohl U. (Munich), Meininger G.A. (Columbia, Mo.)
ISSN: 1018–1172 (Print), eISSN: 1423–0135 (Online)
For additional information: http://www.karger.com/JVR
Copyright / Drug Dosage
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 or, in the case of photocopying, direct payment of a specified fee to the Copyright Clearance Center.
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 goverment 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.