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Dev Dyn. 2015 Oct;244(10):1347-55. doi: 10.1002/dvdy.24316. Epub 2015 Aug 21.

Wntless spatially regulates bone development through β-catenin-dependent and independent mechanisms.

Author information

1
Program for Skeletal Disease and Tumor Microenvironment and Center for Cancer and Cell Biology, Van Andel Research Institute, Grand Rapids, Michigan.

Abstract

BACKGROUND:

Canonical and noncanonical Wnt signaling pathways both play pivotal roles in bone development. Wntless/GPR177 is a chaperone protein that is required for secretion of all Wnt ligands. We previously showed that deletion of Wntless within mature osteoblasts severely impaired postnatal bone homeostasis.

RESULTS:

In this study, we systemically evaluated how deletion of Wntless in different stages of osteochondral differentiation affected embryonic bone development, by crossing Wntless (Wls)-flox/flox mice with strains expressing cre recombinase behind the following promoters: Osteocalcin, Collagen 2a1, or Dermo1. Ex vivo µCT and whole-mount skeletal staining were performed to examine skeletal mineralization. Histology and immunohistochemistry were used to evaluate cellular differentiation and alterations in Wnt signaling. In this work, we found that Wntless regulated chondrogenesis and osteogenesis through both canonical and noncanonical Wnt signaling.

CONCLUSIONS:

These findings provide more insight into the requirements of different Wnt-secretion cell types critical for skeletal development.

KEYWORDS:

Col2a1; Dermo1; Osteocalcin; Wnt secretion; Wntless; skeletal development

PMID:
26249818
PMCID:
PMC4844555
DOI:
10.1002/dvdy.24316
[Indexed for MEDLINE]
Free PMC Article

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