Hormone Research in Paediatrics

Sex Differentiation and Ovarian Function

Physiological Role of Insulin-Like-Growth-Factor-Binding Protein-4 in Human Folliculogenesis

Iwashita M.a · Kudo Y.b · Yoshimura Y.c · Adachi T.b · Katayama E.d · Takeda Y.b

Author affiliations

aMaternal and Perinatal Center, and bDepartment of Obstetrics and Gynecology, Tokyo Women’s Medical College, cDepartment of Obstetrics and Gynecology, Keio University, School of Medicine, and dDepartment of Obstetrics and Gynecology, Ogikubo Hospital, Tokyo, Japan

Related Articles for ""

Horm Res 1996;46:31–36

Log in to MyKarger to check if you already have access to this content.


Buy

  • FullText & PDF
  • Unlimited re-access via MyKarger
  • Unrestricted printing, no saving restrictions for personal use
read more

CHF 38.00 *
EUR 35.00 *
USD 39.00 *

Select

KAB

Buy a Karger Article Bundle (KAB) and profit from a discount!


If you would like to redeem your KAB credit, please log in.


Save over 20% compared to the individual article price.

Learn more

Rent/Cloud

  • Rent for 48h to view
  • Buy Cloud Access for unlimited viewing via different devices
  • Synchronizing in the ReadCube Cloud
  • Printing and saving restrictions apply

Rental: USD 8.50
Cloud: USD 20.00

Select

Subscribe

  • Access to all articles of the subscribed year(s) guaranteed for 5 years
  • Unlimited re-access via Subscriber Login or MyKarger
  • Unrestricted printing, no saving restrictions for personal use
read more

Subcription rates


Select
* The final prices may differ from the prices shown due to specifics of VAT rules.

Article / Publication Details

First-Page Preview
Abstract of Sex Differentiation and Ovarian Function

Published online: December 09, 2008
Issue release date: 1996

Number of Print Pages: 6
Number of Figures: 0
Number of Tables: 0

ISSN: 1663-2818 (Print)
eISSN: 1663-2826 (Online)

For additional information: https://www.karger.com/HRP

Abstract

Insulin-like growth factor (IGF)-I and IGF-II, and their binding proteins (IGFBPs) have been demonstrated to play important roles in follicular development as intraovarian regulators. Previous studies have demonstrated that the follicular fluid of atretic follicles contains high levels of IGFBP-2 and IGFBP-4, which are known to inhibit the action of IGFs. In this study, we identified IGFBP-4 protease activity in the follicular fluid of developing but not atretic follicles. To elucidate the regulation mechanism of IGFBP-4 proteolytic activity in the ovary, cultured luteinized granulosa cells (GCs) were incubated with various hormones, and proteolyzed IGFBP-4 in the medium was analyzed. IGFBP-4 proteolytic activity was increased when GCs were incubated with IGFs, estradiol or follicle-stimulating hormone (FSH) but not with testosterone. We also showed that IGFBP-4 inhibited IGF-I-induced estradiol release by GCs while proteolyzed IGFBP-4 did not. These results suggest that human luteinized GCs produce IGFBP-4 protease, and that FSH and IGFs may stimulate folliculogenesis by modulating IGFBP-4 degradation in the ovary.

© 1997 S. Karger AG, Basel




Related Articles:


Article / Publication Details

First-Page Preview
Abstract of Sex Differentiation and Ovarian Function

Published online: December 09, 2008
Issue release date: 1996

Number of Print Pages: 6
Number of Figures: 0
Number of Tables: 0

ISSN: 1663-2818 (Print)
eISSN: 1663-2826 (Online)

For additional information: https://www.karger.com/HRP


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.
TOP