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Laser Capture Microdissection of Mouse Embryonic Cartilage and Bone for Gene Expression Analysis
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Cbfb regulates bone development by stabilizing Runx family proteins.

Xin Qin1, Qing Jiang, Yuki Matsuo

  • 1Department of Cell Biology, Unit of Basic Medical Sciences, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan.

Journal of Bone and Mineral Research : the Official Journal of the American Society for Bone and Mineral Research
|September 30, 2014
PubMed
Summary

Core-binding factor beta (Cbfb) is essential for skeletal development, regulating chondrocyte and osteoblast differentiation. Cbfb stabilizes Runx family proteins, crucial for bone formation and growth.

Keywords:
CBFBCCDENDOCHONDRAL OSSIFICATIONINTRAMEMBRANOUS OSSIFICATIONRUNX2

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Area of Science:

  • Skeletal Biology
  • Developmental Biology
  • Molecular Genetics

Background:

  • Runx family proteins (Runx1, Runx2, Runx3) are critical for skeletal development, with Runx2 essential for osteoblast and chondrocyte maturation.
  • Core-binding factor beta (Cbfb) heterodimerizes with Runx proteins, enhancing their DNA-binding capacity.
  • Previous studies indicated Cbfb's role in skeletal development following partial rescue of hematopoiesis in Cbfb-deficient mice, but precise functions remained unclear.

Purpose of the Study:

  • To elucidate the specific functions of Cbfb in skeletal development by conditionally deleting it in mesenchymal progenitor cells.
  • To investigate the impact of Cbfb deletion on chondrocyte and osteoblast differentiation and proliferation.
  • To determine Cbfb's role in the regulation and stability of Runx family proteins during skeletal development.

Main Methods:

  • Conditional deletion of Cbfb in mesenchymal cells using Cbfb(fl/fl) mice crossed with Dermo1 Cre knock-in mice (Cbfb(fl/fl/Cre)).
  • Analysis of skeletal phenotypes, including ossification, chondrocyte maturation, proliferation, and osteoblast differentiation in Cbfb(fl/fl/Cre) embryos.
  • In vitro differentiation assays of chondrocytes and osteoblasts, and analysis of promoter activities (Ihh, Col10a1, Bglap2).
  • Western blot analysis to assess Runx family protein levels and stability in Cbfb(fl/fl/Cre) embryos and primary osteoblasts.

Main Results:

  • Cbfb(fl/fl/Cre) mice exhibited dwarfism, with retarded intramembranous and endochondral ossification.
  • Chondrocyte maturation, proliferation, and osteoblast differentiation were significantly inhibited in Cbfb(fl/fl/Cre) mice, both in vivo and in vitro.
  • Reporter activities driven by chondrocyte and osteoblast-specific promoters were reduced in Cbfb-deficient cells.
  • Levels of Runx1, Runx2, and Runx3 proteins were reduced in Cbfb(fl/fl/Cre) embryos and primary osteoblasts.
  • Runx2 protein stability was compromised in Cbfb-deficient osteoblasts, with less dependence observed in calvariae compared to limb skeletons.

Conclusions:

  • Cbfb is indispensable for skeletal development, regulating chondrocyte and osteoblast differentiation and proliferation.
  • Cbfb plays a crucial role in stabilizing Runx family proteins, thereby influencing skeletal formation.
  • Runx2 protein stability is differentially regulated by Cbfb in different skeletal elements, with calvarial Runx2 being less dependent on Cbfb compared to limb skeletal Runx2.