Journal of Cell Communication and Signaling

, Volume 7, Issue 4, pp 265–278 | Cite as

Inhibition of CK2 binding to BMPRIa induces C2C12 differentiation into osteoblasts and adipocytes

  • Oleksandra Moseychuk
  • Hemanth Akkiraju
  • Joyita Dutta
  • Alex D’Angelo
  • Beth Bragdon
  • Randall L. Duncan
  • Anja NoheEmail author
Research Article


BMP2 is a growth factor that regulates the cell fate of mesenchymal stem cells into osteoblast and adipocytes. However, the detailed signaling pathways and mechanism are unknown. We previously reported a new interaction of Casein kinase II (CK2) with the BMP receptor type-Ia (BMPRIa) and demonstrated using mimetic peptides CK2.1, CK2.2 and CK2.3 that the release of CK2 from BMPRIa activates Smad signaling and osteogenesis. Previously, we showed that mutation of these CK2 sites on BMPRIa (MCK2.1 (476S-A), MCK2.2 (324S-A) and MCK2.3 (214S-A)) induced osteogenesis. However, one mutant MCK2.1 induced osteogenesis similar to overexpression of wild type BMPRIa, suggesting that the effect of this mutant on mineralization was due to overexpression. In this paper we investigated the signaling pathways involved in the CK2-BMPRIa mediated osteogenesis and identified a new signaling pathway activating adipogenesis dependent on the BMPRIa and CK2 association. Further the mechanism for adipogenesis and osteogenesis is specific to the CK2 interaction site on BMPRIa. In detail our data show that overexpression of MCK2.2 induced osteogenesis was dependent on Caveolin-1 (Cav1) and the activation of the Smad and mTor pathways, while overexpression of MCK2.3 induced osteogenesis was independent of Caveolin-1 without activation of Smad pathway. However, MCK2.3 induced osteogenesis via the MEK pathway. The adipogenesis induced by the overexpression of MCK2.2 in C2C12 cells was dependent on the p38 and ERK pathways as well as Caveolin-1. These data suggest that signaling through BMPRIa used two different signaling pathways to induce osteogenesis dependent on CK2. Additionally the data supports a signaling pathway initiated in caveolae and one outside of caveolae to induce mineralization. Moreover, they reveal the signaling pathway of BMPRIa mediated adipogenesis.


BMP2 Adipogenesis Osteogenesis Casein Kinase II 


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Copyright information

© The International CCN Society 2013

Authors and Affiliations

  • Oleksandra Moseychuk
    • 1
  • Hemanth Akkiraju
    • 1
  • Joyita Dutta
    • 1
  • Alex D’Angelo
    • 1
  • Beth Bragdon
    • 1
  • Randall L. Duncan
    • 1
  • Anja Nohe
    • 1
    • 2
    Email author
  1. 1.Department of Biological SciencesUniversity of DelawareNewarkUSA
  2. 2.Department of BiologyUniversity of DelawareNewarkUSA

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