The role of APCDD1 in epithelial rearrangement in tooth morphogenesis

Sanjiv Neupane, Wern Joo Sohn, Gi Jeong Gwon, Ki Rim Kim, Sanggyu Lee, Chang Hyeon An, Jo Young Suh, Hong In Shin, Hitoshi Yamamoto, Sung Won Cho, Youngkyun Lee, Jae Young Kim

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)377-387
Number of pages11
JournalHistochemistry and cell biology
Volume144
Issue number4
DOIs
Publication statusPublished - 2015 Oct 26

Bibliographical note

Funding Information:
This study was supported by a National Research Foundation of Korea (NRF) Grant funded by the Korean Government (MSIP; No. 2008–0062282).

Publisher Copyright:
© 2015, Springer-Verlag Berlin Heidelberg.

All Science Journal Classification (ASJC) codes

  • Histology
  • Molecular Biology
  • Medical Laboratory Technology
  • Cell Biology

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