Disruption of Scube2 Impairs Endochondral Bone Formation

Yuh Charn Lin, Steve R. Roffler, Yu Ting Yan, Ruey Bing Yang

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)

Abstract

Signal peptide-CUB-EGF domain-containing protein 2 (SCUBE2) belongs to a secreted and membrane-tethered multidomain SCUBE protein family composed of three members found in vertebrates and mammals. Recent reports suggested that zebrafish scube2 could facilitate sonic hedgehog (Shh) signaling for proper development of slow muscle. However, whether SCUBE2 can regulate the signaling activity of two other hedgehog ligands (Ihh and Dhh), and the developmental relevance of the SCUBE2-induced hedgehog signaling in mammals remain poorly understood. In this study, we first showed that as compared with SCUBE1 or SCUBE3, SCUBE2 is the most potent modulator of IHH signaling in vitro. In addition, gain and loss-of-function studies demonstrated that SCUBE2 exerted an osteogenic function by enhancing Ihh-stimulated osteoblast differentiation in the mouse mesenchymal progenitor cells. Consistent with these in vitro studies and the prominent roles of Ihh in coordinating skeletogenesis, genetic ablation of Scube2 (-/-) caused defective endochondral bone formation and impaired Ihh-mediated chondrocyte differentiation and proliferation as well as osteoblast differentiation of -/- bone-marrow mesenchymal stromal-cell cultures. Our data demonstrate that Scube2 plays a key regulatory role in Ihh-dependent endochondral bone formation.

Original languageEnglish
Pages (from-to)1255-1267
Number of pages13
JournalJournal of Bone and Mineral Research
Volume30
Issue number7
DOIs
Publication statusPublished - Jul 1 2015

Keywords

  • BONE μCTCT
  • GENETIC ANIMAL MODELS
  • HEDGEHOGS
  • MOLECULAR PATHWAYS-DEVELOPMENT
  • OSTEOBLAST

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Orthopedics and Sports Medicine

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