The role of APCDD1 in epithelial rearrangement in tooth morphogenesis

Adenomatosis polyposis coli downregulated 1 (APCDD1), a negative regulator of Wnt signaling, was examined to understand detailed mechanisms underlying Wnt signaling tooth development. In situ hybridization showed that Apcdd1 was expressed in the condensed mesenchyme at the bud stage, and in the inne...

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Veröffentlicht in:Histochemistry and cell biology 2015-10, Vol.144 (4), p.377-387
Hauptverfasser: Neupane, Sanjiv, Sohn, Wern-Joo, Gwon, Gi-Jeong, Kim, Ki-Rim, Lee, Sanggyu, An, Chang-Hyeon, Suh, Jo-Young, Shin, Hong-In, Yamamoto, Hitoshi, Cho, Sung-Won, Lee, Youngkyun, Kim, Jae-Young
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container_title Histochemistry and cell biology
container_volume 144
creator Neupane, Sanjiv
Sohn, Wern-Joo
Gwon, Gi-Jeong
Kim, Ki-Rim
Lee, Sanggyu
An, Chang-Hyeon
Suh, Jo-Young
Shin, Hong-In
Yamamoto, Hitoshi
Cho, Sung-Won
Lee, Youngkyun
Kim, Jae-Young
description Adenomatosis polyposis coli downregulated 1 (APCDD1), a negative regulator of Wnt signaling, was examined to understand detailed mechanisms underlying Wnt signaling tooth development. In situ hybridization showed that Apcdd1 was expressed in the condensed mesenchyme at the bud stage, and in the inner enamel epithelium (IEE), including enamel knot (EK) at the cap stage. In vitro organ cultivation by using Apcdd1 antisense oligodeoxynucleotides was performed at E13.5 for 2 days to define the developmental functions of APCDD1 during tooth development. Analysis of histogenesis and cellular events such as cell adhesion, proliferation, apoptosis and epithelial rearrangement after Apcdd1 knockdown showed altered morphogenesis of the tooth germ with decreased cell proliferation and altered localization of cell adhesion molecules. Actin filament staining and 1,1′-dioctadecyl-3,3,3′,3′-tetramethylindocarbocyanine perchlorate (DiI) labeling of IEE cells showed that Apcdd1 knockdown enhanced epithelial rearrangement in the IEE and EK. To understand the precise signaling regulations of Apcdd1, we evaluated the altered expression patterns of signaling molecules, related with Wnt and enamel knot signalings using RT-qPCR. Tooth germs at cap stage were transplanted into the kidney capsules and were allowed to develop into calcified teeth for 3 weeks. Apcdd1 knockdown increased the number of ectopic cusps on the mesial side of the tooth. Our results suggested that APCDD1 modulates the gene expression of Wnt- and EK-related signaling molecules at the cap stage of tooth development, and is involved in tooth cusp patterning by modulating the epithelial rearrangement in the IEE.
doi_str_mv 10.1007/s00418-015-1345-z
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subjects Animals
Biochemistry
Biomedical and Life Sciences
Biomedicine
Cell adhesion & migration
Cell Adhesion Molecules - metabolism
Cell Biology
Cell Proliferation
Developmental Biology
Epithelial Cells - metabolism
Gene expression
Gene Expression Regulation, Developmental
Gene Knockdown Techniques
Gestational Age
Intracellular Signaling Peptides and Proteins - genetics
Intracellular Signaling Peptides and Proteins - metabolism
Membrane Proteins - genetics
Membrane Proteins - metabolism
Mice
Molar - embryology
Molar - metabolism
Morphogenesis
Odontogenesis
Oligonucleotides, Antisense - genetics
Oligonucleotides, Antisense - metabolism
Original Paper
Teeth
Tissue Culture Techniques
Wnt Signaling Pathway
title The role of APCDD1 in epithelial rearrangement in tooth morphogenesis
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