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Updated: Jun 15, 2026

Application of Retinoic Acid to Obtain Osteocytes Cultures from Primary Mouse Osteoblasts
07:13

Application of Retinoic Acid to Obtain Osteocytes Cultures from Primary Mouse Osteoblasts

Published on: May 13, 2014

Retinoid-suppressed phosphorylation of RARalpha mediates the differentiation pathway of osteosarcoma cells

P Luo1, X Yang, M Ying

  • 1Department of Pathology, Childrens Hospital Los Angeles Saban Research Institute, Los Angeles, CA 90027, USA.

Oncogene
|March 2, 2010
PubMed

Insights

Retinoic acid (RA) triggers osteosarcoma cell differentiation by reducing retinoic acid receptor alpha (RARalpha) phosphorylation. This pathway involves fibroblast growth factor 8f (FGF8f) induction, inhibiting proliferation and promoting osteoblastic differentiation.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • Retinoic acid (RA) regulates cell proliferation and differentiation but its role in osteosarcoma is unclear.
  • Osteosarcoma is a primary bone cancer with limited treatment options.

Purpose of the Study:

  • To elucidate RA-mediated signaling pathways in human osteosarcoma cell differentiation.
  • To investigate the role of retinoic acid receptor alpha (RARalpha) phosphorylation in osteosarcoma.

Main Methods:

  • Utilized human U2OS osteosarcoma cells and primary osteosarcoma cells.
  • Employed RA treatment, RARalpha phosphorylation-defective mutant (RARalphaS77A) overexpression, and gene expression analysis.
  • Assessed tumor formation suppression in nude mice.

Main Results:

  • Decreased RARalpha phosphorylation by RA or RARalphaS77A inhibited proliferation and induced differentiation in U2OS cells.
  • RARalphaS77A overexpression suppressed tumor formation in vivo.
  • RA and RARalphaS77A induced similar differentiation pathways in various osteosarcoma and stem cells.
  • Fibroblast growth factor 8f (FGF8f) induction by RA/RARalphaS77A mediated osteoblastic differentiation.

Conclusions:

  • RA-suppressed RARalpha phosphorylation is a key mechanism in osteosarcoma differentiation.
  • FGF8f acts as a downstream mediator in the RA-induced differentiation pathway.
  • Targeting RARalpha phosphorylation offers a potential therapeutic strategy for osteosarcoma.

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