6
views
0
recommends
+1 Recommend
1 collections
    0
    shares
      • Record: found
      • Abstract: found
      • Article: found

      Neuropeptide Y Stimulates Growth Hormone and Gonadotropin Release from the Goldfish Pituitary in vitro

      Read this article at

      ScienceOpenPublisherPubMed
      Bookmark
          There is no author summary for this article yet. Authors can add summaries to their articles on ScienceOpen to make them more accessible to a non-specialist audience.

          Abstract

          The effects of neuropeptide Y (NPY) on release of growth hormone (GH) and gonadotropin (GTH) from the goldfish pituitary in vitro were investigated. Exposure of perifused pituitary fragments, taken from female goldfish at late stages of gonadal recrudescence, to 5-min pulses of human NPY resulted in a rapid dose-dependent stimulation of GH and GTH release, with half-maximal effective dosages of 0.51 ± 0.24 and 2.37 ± 1.05 n M for GH and GTH, respectively. Repeated treatments with pulses of NPY (10 n M for GH, 5 n M for GTH) at 55-min intervals did not significantly alter the responsiveness of pituitary fragments to NPY; however, prior exposure of pituitary fragments to pulses of higher doses of NPY (50 n M GH, 10 n M for GTH) significantly reduced the subsequent hormone responses. When given at 85-min intervals repeated treatment with NPY did not blunt hormone responses to the second and third stimulations at these higher dosages. These results indicate that NPY acts at the pituitary level to stimulate GH and GTH secretion in female goldfish. The GTH response and, to a lesser extent, the GH response become desensitized to further stimulation by NPY in dose- and time-dependent manners. NPY should be considered as one element in the multifactorial systems regulating the GH and GTH secretion in goldfish.

          Related collections

          Author and article information

          Journal
          NEN
          Neuroendocrinology
          10.1159/issn.0028-3835
          Neuroendocrinology
          S. Karger AG
          0028-3835
          1423-0194
          1990
          1990
          03 April 2008
          : 52
          : 1
          : 28-34
          Affiliations
          Department of Zoology, University of Alberta, Edmonton, Canada
          Article
          125534 Neuroendocrinology 1990;52:28–34
          10.1159/000125534
          2118606
          © 1990 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
          Pages: 7
          Categories
          Original Paper

          Comments

          Comment on this article