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SMURF2 regulates bone homeostasis by disrupting SMAD3 interaction with vitamin D receptor in osteoblasts

Zhan Xu1, Matthew B Greenblatt2, Guang Yan1

  • 1State Key Laboratory of Cell Biology, CAS Center for Excellence in Molecular Cell Science, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai 200031, China.

Nature Communications
|February 21, 2017
PubMed

Insights

Mice lacking SMURF2 develop severe osteoporosis due to increased osteoclast activity. SMURF2 normally prevents this by regulating RANKL expression in osteoblasts, highlighting its role in bone homeostasis.

Area of Science:

  • Bone biology and skeletal homeostasis.
  • Cell signaling and molecular regulation of bone metabolism.

Background:

  • Osteoblast-osteoclast communication is crucial for maintaining bone health.
  • Dysregulation of this balance leads to bone diseases like osteoporosis.

Purpose of the Study:

  • To investigate the role of SMURF2 in bone homeostasis and its impact on osteoblast-osteoclast interactions.
  • To elucidate the molecular mechanisms by which SMURF2 influences bone mass.

Main Methods:

  • Analysis of SMURF2-deficient mice exhibiting severe osteoporosis.
  • Assessment of osteoblast and osteoclast activity and numbers.
  • Investigation of RANKL expression and its regulation by SMURF2 in osteoblasts.
  • Genetic manipulation to selectively delete Smurf2 in osteoblasts.

Main Results:

  • SMURF2 deficiency leads to severe osteoporosis with increased osteoclast numbers.
  • Smurf2-deficient osteoblasts show elevated RANKL expression.
  • SMURF2 regulates RANKL by affecting SMAD3 ubiquitination and its interaction with the vitamin D receptor.
  • Selective deletion of Smurf2 in osteoblasts mimics the germline deficiency phenotype.

Conclusions:

  • SMURF2 is a critical regulator of bone homeostasis by controlling osteoblast-dependent osteoclast activity.
  • SMURF2 acts by modulating RANKL expression in osteoblasts, impacting inter-cellular communication.
  • SMURF2 has distinct and partially opposing functions compared to SMURF1 in bone regulation.

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