In the present experiment we examined spontaneous endogenous in vitro dopamine release from the corpus striatum of female rats during the morning (09.00–09.30 h) and afternoon (15.00–15.30 h) photoperiod on each day of the estrous cycle. In the morning, the spontaneous dopamine release rates of D-1, D-2 and proestrous female rats were characterized by initial low values which gradually increased (approximately 3-fold) over the 2.5-hour in vitro perifusion. In the afternoon, spontaneous release rates of D-1, D-2 and estrous females gradually declined (approximately 2.5-fold) over the perifusion period. This rhythmic diurnal fluctuation was disrupted in the afternoon of proestrus and morning of estrus when release rate profiles remained stable over the entire perifusion period. These results suggest that changes in spontaneous in vitro dopamine release of corpus striata derived from rats in different phases of the estrous cycle may reflect novel in vivo interactions of both photoperiodic and hormonal cues.

This content is only available via PDF.
Copyright / Drug Dosage / Disclaimer
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.
You do not currently have access to this content.