Smad1/5 and Smad4 expression are important for osteoclast differentiation

Amy Tasca, Melissa Stemig, Aaron Broege, Brandon Huang, Julia Davydova, An Zwijsen, Lieve Umans, Eric D. Jensen, Raj Gopalakrishnan, Kim C. Mansky

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

To investigate the necessity of the canonical BMP pathway during osteoclast differentiation, we created osteoclasts with a conditional gene deletion for Smad1 and Smad5 (SMAD1/5), or Smad4 using adenovirus expressing CRE recombinase (Ad-CRE). Reduction of either Smad4 or Smad1/5 expression resulted in fewer and smaller multinuclear cells compared to control cells. We also detected changes in osteoclast enriched genes, demonstrated by decreased Dc-stamp and cathepsin K expression in both Smad4 and Smad1/5 Ad-CRE osteoclasts, and changes in c-fos and Nfatc1 expression in only Smad4 Ad-CRE cells. Lastly we also detected a significant decrease in resorption pits and area resorbed in both the Smad4 and Smad1/5 Ad-CRE osteoclasts. Because we inhibited osteoclast differentiation with loss of either Smad4 or Smad1/5 expression, we assessed whether BMPs affected osteoclast activity in addition to BMP's effects on differentiation. Therefore, we treated mature osteoclasts with BMP2 or with dorsomorphin, a chemical inhibitor that selectively suppresses canonical BMP signaling. We demonstrated that BMP2 stimulated resorption in mature osteoclasts whereas treatment with dorsomorphin blocks osteoclast resorption. These results indicate that the BMP canonical signaling pathway is important for osteoclast differentiation and activity. J. Cell. Biochem. 116: 1350-1360, 2015.

Original languageEnglish (US)
Pages (from-to)1350-1360
Number of pages11
JournalJournal of Cellular Biochemistry
Volume116
Issue number7
DOIs
StatePublished - Jul 1 2015

Bibliographical note

Publisher Copyright:
© 2015 Wiley Periodicals, Inc. © 2015 Wiley Periodicals, Inc.

Keywords

  • BMPs
  • FUSION
  • OSTEOCLASTS
  • RESORPTION
  • SMADs
  • TGF-β

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