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Inhibition of Wnt/β-catenin pathway by Dikkopf-1 affects midfacial morphogenesis in chick embryo

Paper ID Volume ID Publish Year Pages File Format Full-Text
20634 43184 2014 6 PDF Available
Title
Inhibition of Wnt/β-catenin pathway by Dikkopf-1 affects midfacial morphogenesis in chick embryo
Abstract

The development of the vertebrate face is regulated by complex interactions among several signaling pathways. Dickkopf-1 (Dkk-1), an inhibitor of the Wnt/β-catenin signaling pathway, can affect midfacial morphogenesis. The downstream target genes of the Wnt/β-catenin signaling pathway in morphogenesis of the developing upper jaw and lip remain unknown. To investigate the functional roles of Wnt/β-catenin signaling in facial development, we performed a loss-of-function experiment using local implantation of beads soaked with Dkk-1 during lip fusion at the maxillary prominence of chick embryos at stage 22(HH22). Antagonism of Wnt/β-catenin signaling by Dkk-1 induced deformities of the premaxilla and jugal bone, which are derived from the maxillary mesenchyme. Real-time and semi-quantitative RT-PCR analysis showed the significant reduction of Lhx8, Msx1 and Msx2 expression levels around the beads in the maxillary mesenchyme at 6 and 24 h after bead implantation. Time course experiments in the HH 22 embryos showed the effect of Dkk-1 on Lhx8, Msx1 and Msx2 expression was not significant after 48 h of the treatment. At HH 26 when the fusion of facial primordial started, Dkk-1 application did not exhibit any significant reduction of those genes. Our findings suggested that Dkk-1 regulates maxillary morphogenesis in chick embryos through Lhx8, Msx1 and Msx2 signals. Wnt/β-catenin signaling is responsible for intrinsic upper jaw development before the lip fusion.

Keywords
Dickkopf-1 (Dkk-1); Lhx8; Wnt/β-catenin signaling; Chick embryo; Craniofacial development
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Inhibition of Wnt/β-catenin pathway by Dikkopf-1 affects midfacial morphogenesis in chick embryo
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Bioscience and Bioengineering - Volume 117, Issue 6, June 2014, Pages 664–669
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us