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Silencing FOXO1 attenuates dexamethasone-induced apoptosis in osteoblastic MC3T3-E1 cells

Lu Xing1, Xiaoqi Zhang1, Hao Feng1

  • 1Shandong Provincial Key Laboratory of Oral Tissue Regeneration, Department of Bone Metabolism, School of Stomatology Shandong University, Jinan, 250012, China.

Biochemical and Biophysical Research Communications
|April 24, 2019
PubMed

Insights

Dexamethasone induces osteoblast apoptosis by upregulating FOXO1. Silencing FOXO1 (forkhead box O1) partially blocks this effect, revealing FOXO1

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Dexamethasone (DEX), a potent glucocorticoid, exhibits anti-inflammatory and immunosuppressive properties.
  • While DEX is known to induce osteoblast apoptosis, the precise molecular mechanisms remain unclear.
  • FOXO1 (forkhead box O1) is a key transcription factor regulating cell proliferation and apoptosis.

Purpose of the Study:

  • To investigate the role of FOXO1 in dexamethasone-induced apoptosis of osteoblastic MC3T3-E1 cells.
  • To elucidate the molecular mechanisms underlying DEX-induced apoptosis in osteoblasts.

Main Methods:

  • Bioinformatic analysis to identify DEX-related genes and associated biological processes, including FOXO1.
  • Experimental validation using cell viability assays (CCK8), flow cytometry for apoptosis detection, siRNA for gene silencing, and Western blotting for protein analysis.
  • GEO data analysis to confirm FOXO1 expression levels.

Main Results:

  • DEX-related genes were found to be involved in cell proliferation, apoptosis, and angiogenesis.
  • Dexamethasone treatment significantly increased FOXO1 expression in MC3T3-E1 cells.
  • DEX inhibited cell viability and promoted apoptosis, effects partially reversed by siRNA-mediated FOXO1 silencing.

Conclusions:

  • Dexamethasone impacts critical biological processes in osteoblasts, including apoptosis.
  • FOXO1 plays a crucial role in mediating dexamethasone-induced apoptosis in osteoblastic cells.
  • Targeting FOXO1 may offer a strategy to mitigate DEX-induced osteoblast apoptosis.
Keywords:
ApoptosisDexamethasoneFOXO1Osteoblasts

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