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Bone Cells and Tissue01:30

Bone Cells and Tissue

Bones contain a relatively small number of cells entrenched in a matrix of organic and inorganic components. Although bone cells compose only a small amount of the bone volume, they are crucial to its function. Four types of cells are found within the bone tissue— osteoblasts, osteocytes, osteogenic cells, and osteoclasts.
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Differentiation and Characterization of Osteoclasts from Human Induced Pluripotent Stem Cells
10:52

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Published on: March 22, 2024

Glucocorticoid dose determines osteocyte cell fate.

Junjing Jia1, Wei Yao, Min Guan

  • 1Department of Medicine, University of California at Davis Medical Center, Sacramento, California 95817, USA.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|June 28, 2011
PubMed
Summary

Glucocorticoids (GCs) impact osteocyte cell fate dose-dependently. Lower doses promote autophagy for survival, while higher doses induce apoptosis, affecting bone health.

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Area of Science:

  • Bone Biology
  • Cellular Stress Response
  • Pharmacology

Background:

  • Glucocorticoids (GCs) are known to induce osteocyte apoptosis and autophagy.
  • Understanding the dose-dependent effects of GCs on osteocyte cell fate is crucial for bone health.

Purpose of the Study:

  • To investigate the dose-dependent effects of glucocorticoids (GCs) on osteocyte cell fate.
  • To determine the role of autophagy in osteocyte survival under GC exposure.

Main Methods:

  • In vivo studies using male Swiss-Webster mice treated with prednisolone.
  • In vitro studies using an osteocyte cell line (MLO-Y4) treated with dexamethasone.
  • Analysis of gene expression (RT-PCR), protein levels, and cell death markers (immunostaining).

Main Results:

  • GC treatments dose-dependently decreased antioxidant, autophagy, and anti-apoptosis gene pathways.
  • Osteocyte autophagy increased at lower GC doses (1.4 and 2.8 mg/kg/d) in cortical bone.
  • Osteocyte apoptosis increased at a higher GC dose (2.8 mg/kg/d) in cortical bone.
  • Autophagy correlated with increased cathepsin K protein levels in vitro.

Conclusions:

  • Glucocorticoid treatment dose-dependently alters osteocyte cell fate.
  • Autophagy may serve as a survival mechanism for osteocytes against GC-induced stress.
  • GCs differentially affect bone cell fate pathways based on dosage.