Wnt/Shh interactions regulate ectodermal boundary formation during mammalian tooth development

Sarkar, L., Cobourne, M., Naylor, S., Smalley, Matthew John ORCID: https://orcid.org/0000-0001-9540-1146, Dale, Trevor Clive ORCID: https://orcid.org/0000-0002-4880-9963 and Sharpe, P. T. 2000. Wnt/Shh interactions regulate ectodermal boundary formation during mammalian tooth development. Proceedings of the National Academy of Sciences of the United States of America 97 (9) , pp. 4520-4524. 10.1073/pnas.97.9.4520

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Abstract

Interactions between the Wnt (wingless) and hedgehog signaling pathways were first described as playing a role in establishing boundaries between ectodermal cells in Drosophila segmentation. During the initiation of mammalian tooth development, boundaries that distinguish oral from dental ectoderm must be formed to correctly position the sites of tooth formation. We describe a reciprocal relationship between the expression of Wnt-7b in presumptive oral ectoderm and Shh in presumptive dental ectoderm in mouse embryos that mark boundaries between these cells with different developmental fates. By using a murine retrovirus to ectopically express Wnt-7b in presumptive dental ectoderm in mandibular arch explants, we show that Shh expression in the ectoderm and Ptc expression in the underlying ectomesenchyme are down-regulated, and tooth development is subsequently arrested. This suggests that Wnt-7b acts to repress Shh expression in oral ectoderm, thus maintaining the boundaries between oral and dental ectodermal cells. Implantation of beads soaked in Shh protein into Wnt-7b-infected explants resulted in complete rescue of tooth development, confirming that the repressive action of Wnt-7b specifically affects Shh signaling.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Biosciences European Cancer Stem Cell Research Institute (ECSCRI)
Publisher:	National Academy of Sciences
ISSN:	0027-8424
Last Modified:	27 Oct 2022 08:49
URI:	https://orca.cardiff.ac.uk/id/eprint/63490

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