title: Neogenin regulation of BMP-induced canonical Smad signaling and endochondral bone formation.
abstract: Neogenin has been identified as a receptor for the neuronal axon guidance cues netrins and RGMs (repulsive guidance molecules). Here we provide evidence for neogenin in regulating endochondral bone development and BMP (bone morphogenetic protein) signaling. Neogenin-deficient mice were impaired in digit/limb development and endochondral ossification. BMP2 induction of Smad1/5/8 phosphorylation and Runx2 expression, but not noncanonical p38 MAPK activation, was reduced in chondrocytes from neogenin mutant mice. BMP receptor association with membrane microdomains, which is necessary for BMP signaling to Smad, but not p38 MAPK, was diminished in neogenin-deficient chondrocytes. Furthermore, RGMs appear to mediate neogenin interaction with BMP receptors in chondrocytes. Taken together, our results indicate that neogenin promotes chondrogenesis in vitro and in vivo, revealing an unexpected mechanism underlying neogenin regulation of BMP signaling.
authors.affiliation: Institute of Molecular Medicine and Genetics and Department of Neurology, Medical College of Georgia, Augusta, GA 30912, USA.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Zhou
authors.forename: Jianxin
authors.initials: J
authors.lastname: Xie
authors.forename: Daehoon
authors.initials: D
authors.lastname: Lee
authors.forename: Yu
authors.initials: Y
authors.lastname: Liu
authors.forename: Jiung
authors.initials: J
authors.lastname: Jung
authors.forename: Lijuan
authors.initials: L
authors.lastname: Zhou
authors.forename: Shan
authors.initials: S
authors.lastname: Xiong
authors.forename: Lin
authors.initials: L
authors.lastname: Mei
authors.forename: Wen-Cheng
authors.initials: WC
authors.lastname: Xiong
mesh_terms: D000818:Animals; D001846:Bone Development / Q000235:genetics / Q000502:physiology*; D055396:Bone Morphogenetic Protein 2 / Q000494:pharmacology; D052004:Bone Morphogenetic Protein Receptors / Q000378:metabolism; D019485:Bone Morphogenetic Proteins / Q000235:genetics / Q000502:physiology*; D002454:Cell Differentiation; D049109:Cell Proliferation; D019902:Chondrocytes / Q000166:cytology / Q000187:drug effects / Q000502:physiology; D020219:Chondrogenesis / Q000187:drug effects / Q000235:genetics / Q000502:physiology*; D050659:Core Binding Factor Alpha 1 Subunit / Q000378:metabolism; D005260:Female; D006132:Growth Plate / Q000196:embryology / Q000378:metabolism; D021962:Membrane Microdomains / Q000378:metabolism; D008565:Membrane Proteins / Q000235:genetics / Q000502:physiology*; D051379:Mice; D008810:Mice, Inbred C57BL; D008817:Mice, Mutant Strains; D010766:Phosphorylation; D011247:Pregnancy; D011994:Recombinant Proteins / Q000494:pharmacology; D015398:Signal Transduction / Q000187:drug effects; D051785:Smad Proteins / Q000235:genetics / Q000502:physiology*; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: C525719:Bmp2 protein, mouse; D055396:Bone Morphogenetic Protein 2; D019485:Bone Morphogenetic Proteins; D050659:Core Binding Factor Alpha 1 Subunit; D008565:Membrane Proteins; D011994:Recombinant Proteins; C493716:Runx2 protein, mouse; D051785:Smad Proteins; C091279:neogenin; D048051:p38 Mitogen-Activated Protein Kinases; D052004:Bone Morphogenetic Protein Receptors