Defining BMP functions in the hair follicle by conditional ablation of BMP receptor IA Academic Article uri icon


MeSH Major

  • Bone Morphogenetic Proteins
  • Cell Differentiation
  • Hair Follicle
  • Protein-Serine-Threonine Kinases
  • Receptors, Growth Factor
  • Stem Cells
  • Zebrafish Proteins


  • Using conditional gene targeting in mice, we show that BMP receptor IA is essential for the differentiation of progenitor cells of the inner root sheath and hair shaft. Without BMPRIA activation, GATA-3 is down-regulated and its regulated control of IRS differentiation is compromised. In contrast, Lef1 is up-regulated, but its regulated control of hair differentiation is still blocked, and BMPRIA-null follicles fail to activate Lef1/beta-catenin-regulated genes, including keratin genes. Wnt-mediated transcriptional activation can be restored by transfecting BMPRIA-null keratinocytes with a constitutively activated beta-catenin. This places the block downstream from Lef1 expression but upstream from beta-catenin stabilization. Because mice lacking the BMP inhibitor Noggin fail to express Lef1, our findings support a model, whereby a sequential inhibition and then activation of BMPRIA is necessary to define a band of hair progenitor cells, which possess enough Lef1 and stabilized beta-catenin to activate the hair specific keratin genes and generate the hair shaft.

publication date

  • November 10, 2003



  • Academic Article



  • eng

PubMed Central ID

  • PMC2173651

Digital Object Identifier (DOI)

  • 10.1083/jcb.200309042

PubMed ID

  • 14610062

Additional Document Info

start page

  • 609

end page

  • 23


  • 163


  • 3