FGFR3 induces degradation of BMP type I receptor to regulate skeletal development

Huabing Qi, Min Jin, Yaqi Duan, Xiaolan Du, Yuanquan Zhang, Fangli Ren, Yinyin Wang, Qingyun Tian, Xiaofeng Wang, Quan Wang, Ying Zhu, Yangli Xie, Chuanju Liu, Xu Cao, Yuji Mishina, Di Chen, Chu xia Deng, Zhijie Chang, Lin Chen

Research output: Contribution to journalArticlepeer-review

40 Scopus citations

Abstract

Fibroblast growth factors (FGFs) and their receptors (FGFRs) play significant roles in vertebrate organogenesis and morphogenesis. FGFR3 is a negative regulator of chondrogenesis and multiple mutations with constitutive activity of FGFR3 result in achondroplasia, one of the most common dwarfisms in humans, but the molecular mechanism remains elusive. In this study, we found that chondrocyte-specific deletion of BMP type I receptor a (Bmpr1a) rescued the bone overgrowth phenotype observed in Fgfr3 deficient mice by reducing chondrocyte differentiation. Consistently, using in vitro chondrogenic differentiation assay system, we demonstrated that FGFR3 inhibited BMPR1a-mediated chondrogenic differentiation. Furthermore, we showed that FGFR3 hyper-activation resulted in impaired BMP signaling in chondrocytes of mouse growth plates. We also found that FGFR3 inhibited BMP-2- or constitutively activated BMPR1-induced phosphorylation of Smads through a mechanism independent of its tyrosine kinase activity. We found that FGFR3 facilitates BMPR1a to degradation through Smurf1-mediated ubiquitination pathway. We demonstrated that down-regulation of BMP signaling by BMPR1 inhibitor dorsomorphin led to the retardation of chondrogenic differentiation, which mimics the effect of FGF-2 on chondrocytes and BMP-2 treatment partially rescued the retarded growth of cultured bone rudiments from thanatophoric dysplasia type II mice. Our findings reveal that FGFR3 promotes the degradation of BMPR1a, which plays an important role in the pathogenesis of FGFR3-related skeletal dysplasia.

Original languageEnglish
Pages (from-to)1237-1247
Number of pages11
JournalBiochimica et Biophysica Acta - Molecular Cell Research
Volume1843
Issue number7
DOIs
StatePublished - Jul 2014

Bibliographical note

Funding Information:
We thank Drs. Pavel Krejci (Masaryk University, Czech Republic), Yeguang Chen (Tsinghua University, China) and Lingqiang Zhang (Beijing Institute of Radiation Medicine, China) for providing constructs. The work was supported by the Tsinghua Internal Research Foundation ( 20091081322 ), the National Natural Science Foundation of China (No. 81030036 , No. 30800652 ), the Special Funds for Major State Basic Research Program of China (973 program) (No. 2012CB518100 ), and the Foundation of the State Key Laboratory of Trauma, Burns and Combined Injury (No. SKLZZ200902 ).

Keywords

  • Achondroplasia
  • BMPR1
  • Chondrocyte
  • FGFR3
  • Smurf1

ASJC Scopus subject areas

  • Molecular Biology
  • Cell Biology

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