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MEK1/2 Inhibitor (GDC0623) Promotes Osteogenic Differentiation of Primary Osteoblasts Inhibited by IL-1β through the

Zeng-Qiao Zhang1, Xiao-Shen Hu2, Ye-Chen Lu1

  • 1School of Rehabilitation Science, Shanghai University of Traditional Chinese Medicine, Shanghai, China.

International Journal of Endocrinology
|January 3, 2022
PubMed
Abstract

Insights

GDC0623 inhibits osteoblast proliferation and enhances osteogenic differentiation by blocking the MEK-Erk1/2 pathway, counteracting IL-1β effects. This research offers insights into therapeutic strategies for bone health.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Interleukin-1 beta (IL-1β) is implicated in regulating bone metabolism.
  • Osteogenic differentiation is crucial for bone formation and repair.
  • Understanding signaling pathways involved in osteoblast function is vital for bone disease research.

Purpose of the Study:

  • To investigate the effects of GDC0623 on osteogenic differentiation of osteoblasts induced by IL-1β.
  • To elucidate the underlying molecular mechanisms, including key signaling pathways and protein expressions.

Main Methods:

  • Osteoblasts were treated with IL-1β and GDC0623.
  • Cell proliferation was assessed using CCK8, EdU assay, and Western blotting (PCNA, Cyclin D1).
  • Osteogenic differentiation was evaluated through ALP staining, Alizarin Red staining, calcium concentration assays, immunocytochemistry, RT-qPCR, and immunofluorescence, with mechanistic insights from Western blotting.

Main Results:

  • IL-1β promoted osteoblast proliferation and suppressed osteogenic differentiation by activating MEK-Erk1/2 and Jak-Stat3 pathways, increasing MMP13 and MMP9 levels.
  • GDC0623 treatment reversed these effects by blocking the MEK-Erk1/2 signaling pathway.

Conclusions:

  • GDC0623 effectively counteracts IL-1β-induced suppression of osteogenic differentiation.
  • The MEK-Erk1/2 pathway is a key target for GDC0623's action.
  • Findings suggest GDC0623 as a potential therapeutic agent for conditions involving impaired osteogenesis.

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