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Table of Contents
Vol. 170, No. 2-3, 2002
Issue release date: 2002
Section title: Original Paper
Cells Tissues Organs 2002;170:83–98
(DOI:10.1159/000046183)

Embryonic Submandibular Gland Morphogenesis: Stage-Specific Protein Localization of FGFs, BMPs, Pax6 and Pax9 in Normal Mice and Abnormal SMG Phenotypes in FgfR2-IIIc+/Δ, BMP7–/– and Pax6–/–Mice

Jaskoll T.a · Zhou Y.M.a · Chai Y.b · Makarenkova H.P.c · Collinson J.M.d · West J.D.d · Hajihosseini M.K.e · Lee J.a · Melnick M.a
aLaboratory for Developmental Genetics and bCenter for Craniofacial Molecular Biology, University of Southern California, Los Angeles, Calif., and cCell Biology and Pathology Department, Skirball Institute, NYU School of Medicine, New York, N.Y., USA; dDepartment of Reproductive and Developmental Sciences, University of Edinburgh, and eSchool of Biosciences, University of Birmingham, UK

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Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: December 05, 2001
Issue release date: 2002

Number of Print Pages: 16
Number of Figures: 9
Number of Tables: 1

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: http://www.karger.com/CTO

Abstract

Embryonic submandibular salivary gland (SMG) initiation and branching morphogenesis are dependent on cell-cell communications between and within epithelium and mesenchyme. Such communications are typically mediated in other organs (teeth, lung, lacrimal glands) by growth factors in such a way as to translate autocrine, juxtacrine and paracrine signals into specific gene responses regulating cell division and histodifferentiation. Using Wnt1-Cre/R26R transgenic mice, we demonstrate that embryonic SMG mesenchyme is derived exclusively from cranial neural crest. This origin contrasts to that known for tooth mesenchyme, previously shown to be derived from both neural crest and nonneural crest cells. Thus, although both SMGs and teeth are mandibular derivatives, we can expect overlap and differences in the details of their early inductive interactions. In addition, since embryonic SMG branching morphogenesis is analogous to that seen in other branching organs, we also expect similarities of expression regarding those molecules known to be ubiquitous regulators of morphogenesis. In this study, we performed an analysis of the distribution of specific fibroblast growth factors (FGFs), FGF receptors, bone morphogenetic proteins (BMPs) and Pax transcription factors, previously shown to be important for tooth development and/or branching morphogenesis, from the time of initiation of embryonic SMG development until early branching morphogenesis. In addition, we report abnormal SMG phenotypes in FgfR2- IIIc+/Δ, BMP7–/–and Pax6–/– mice. Our results, in comparison with functional studies in other systems, suggest that FGF-2/FGFR-1, FGF-8/FGFR-2(IIIc) and FGF-10/FGFR-2(IIIb) signaling have different paracrine and juxtacrine functions during SMG initial bud formation and branching. Finally, our observations of abnormal SMGs in BMP7–/– and Pax6–/–indicate that both BMP7 and Pax6 play important roles during embryonic SMG branching morphogenesis.

© 2002 S. Karger AG, Basel


Article / Publication Details

First-Page Preview
Abstract of Original Paper

Published online: December 05, 2001
Issue release date: 2002

Number of Print Pages: 16
Number of Figures: 9
Number of Tables: 1

ISSN: 1422-6405 (Print)
eISSN: 1422-6421 (Online)

For additional information: http://www.karger.com/CTO


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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 or, in the case of photocopying, direct payment of a specified fee to the Copyright Clearance Center.
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.
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