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      Free Insulin-Like Growth Factor I: Are We Hunting a Ghost?

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          Abstract

          During the last decade, there has been an increasing number of publications reporting concentrations of free dissociable insulin-like growth factor I (IGF-I) in serum or plasma. The goal for attempting to measure free IGF-I in a serum sample in vitro has been to obtain information about the bioactivity of IGF-I in target tissues, and thus relate a measurable parameter to biological responses such as longitudinal growth or glucose disappearance rate. In this review, the serum free IGF-I approach is placed into a physiological perspective. In addition, methodological aspects are discussed and suggestions for the validation of free IGF-I assays are presented.

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          Author and article information

          Journal
          HRE
          Horm Res Paediatr
          10.1159/issn.1663-2818
          Hormone Research in Paediatrics
          S. Karger AG
          978-3-8055-7325-2
          978-3-318-00789-3
          1663-2818
          1663-2826
          2001
          2001
          17 November 2004
          : 55
          : Suppl 2
          : 84-93
          Affiliations
          Pediatric Endocrinology Unit, Department of Woman and Child Health, Karolinska Institute, Astrid Lindgren Children’s Hospital, Stockholm, Sweden
          Article
          63482 Horm Res 2001;55(suppl 2):84–93
          10.1159/000063482
          11684884
          43965203-c9fe-48bf-90b3-0e38b8b900be
          © 2001 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
          Page count
          Figures: 3, Tables: 2, References: 39, Pages: 10
          Categories
          Standardization of IGF-I Measurements – IGF-I Assays

          Endocrinology & Diabetes,Neurology,Nutrition & Dietetics,Sexual medicine,Internal medicine,Pharmacology & Pharmaceutical medicine
          Assays,Insulin-like growth factor I,Insulin-like growth factor binding proteins,Free insulin-like growth factor I,Free dissociable insulin-like growth factor I,Serum,Methodology,Bioavailability

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