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      Pituitary Morphology in Anencephalic Human Fetuses

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          Abstract

          Anencephalic fetuses provide a model of pituitary development in the absence of the hypothalamus. We studied pituitaries of 10 anencephalic fetuses at various stages of gestation using formalin-fixed paraffin-embedded tissue with immunocytochemistry for known adenohypophysial hormones, the transcription factors Pit-1 and SF-1, cytokeratins and S-100 protein. Ten age- and sex-matched fetuses with no endocrine abnormality were controls. At 17-18 weeks of gestation, pituitaries of 4 anencephalics had no posterior lobe; the number and size of cells containing adenohypophysial hormones and the transcription factors were indistinguishable from controls, however, juxtanuclear cytokeratin-positive fibrous bodies were inconspicuous in anencephalics and were prominent in the adenohypophyses of controls. At 26-28 weeks of gestation, there was a marked reduction in number and staining intensity of cells containing SF-1, α-subunit of glycoprotein hormones and both gonadotropin β-subunits in the adenohypophyses of 2 anencephalics. After 32 weeks, corticotropes were reduced in number and size, and gonadotropes were almost entirely absent; in contrast, somatotropes, lactotropes and thyrotropes were numerous. S-100 protein immunoreactivity was increased in anencephalic pituitaries after 32 weeks, when it was found in numerous cells that did not have the usual morphology of folliculo-stellate cells.

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          Author and article information

          Journal
          NEN
          Neuroendocrinology
          10.1159/issn.0028-3835
          Neuroendocrinology
          S. Karger AG
          0028-3835
          1423-0194
          1997
          1997
          09 April 2008
          : 65
          : 3
          : 164-172
          Affiliations
          Department of Pathology, Mount Sinai Hospital and St. Michael’s Hospital, University of Toronto, Ont., Canada
          Article
          127177 Neuroendocrinology 1997;65:164–172
          10.1159/000127177
          9087997
          © 1997 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: 9
          Categories
          Adenohypophysis: Cell Biology, Morphology, Colocalization

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