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Cell Rep. 2015 Aug 11;12(6):903-12. doi: 10.1016/j.celrep.2015.07.020. Epub 2015 Jul 30.

Hox5 Genes Regulate the Wnt2/2b-Bmp4-Signaling Axis during Lung Development.

Author information

1
Division of Molecular Medicine and Genetics, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109-2200, USA.
2
Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109-2200, USA.
3
Department of Biology, Wesleyan University, Middletown, CT 06459, USA.
4
Division of Molecular Medicine and Genetics, Department of Internal Medicine, University of Michigan, Ann Arbor, MI 48109-2200, USA; Department of Cell and Developmental Biology, University of Michigan, Ann Arbor, MI 48109-2200, USA. Electronic address: dwellik@umich.edu.

Abstract

Hox genes are required for proper anteroposterior axial patterning and the development of several organ systems. Here, we show that all three Hox5 paralogous genes play redundant roles in the developing lung. Hoxa5;Hoxb5;Hoxc5 triple-mutant embryos develop severely hypoplastic lungs with reduced branching and proximal-distal patterning defects. Hox5 genes are exclusively expressed in the lung mesoderm; however, defects are observed in both lung mesenchyme and endodermally derived epithelium, demonstrating that Hox5 genes act to regulate mesodermal-epithelial crosstalk during development. We show that Hox5 loss of function leads to loss of Wnt2/2b expression in the distal lung mesenchyme and the downregulation of previously identified downstream targets of Wnt2/2b signaling, including Lef1, Axin2, and Bmp4. Wnt2/2b-enriched media rescue proper Sox2/Sox9 patterning and restore Bmp4 expression in Hox5 triple-mutant lung explants. Taken together, these data show that Hox5 genes are key upstream mesenchymal regulators of the Wnt2/2b-Bmp4-signaling axis critical for proper lung patterning.

PMID:
26235626
PMCID:
PMC4536095
DOI:
10.1016/j.celrep.2015.07.020
[Indexed for MEDLINE]
Free PMC Article

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