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Dexamethasone reduces ATDC5 chondrocyte cell viability by inducing autophagy

Yan Zhao1, Yuan Zuo2, Hongjun Huo1

  • 1Department of Spine Surgery, The Second Affiliated Hospital of Inner Mongolia Medical University, Huimin, Hohhot, Inner Mongolia Autonomous Region 010058, P.R. China.

Molecular Medicine Reports
|January 29, 2014
PubMed

Insights

High-dose glucocorticoids (GCs) induce autophagy in chondrocytes, reducing cell viability. This effect, observed in ATDC5 cells with dexamethasone, was blocked by a GC antagonist, highlighting a mechanism for GC-induced skeletal impairment.

Area of Science:

  • Cell Biology
  • Endocrinology
  • Skeletal Development

Background:

  • Glucocorticoids (GCs) are widely used for chronic inflammatory and autoimmune diseases.
  • Prolonged GC use can impair skeletal development, but effects on chondrocytes are understudied.
  • Chondrocytes are crucial for skeletal development.

Purpose of the Study:

  • To investigate the effects of GCs on chondrocytes.
  • To determine if GCs induce autophagy in chondrocytes.
  • To examine the impact of GC-induced autophagy on chondrocyte viability.

Main Methods:

  • Treatment of ATDC5 chondrocyte cell line with varying doses of dexamethasone (Dex).
  • Assessment of autophagy induction.
  • Administration of RU486, a GC antagonist, to inhibit GC effects.
  • Evaluation of ATDC5 cell viability.

Main Results:

  • Dexamethasone (Dex) induced autophagy in ATDC5 chondrocytes in a dose-dependent manner (1-100 µM).
  • Autophagy induction by Dex was reversible with the GC antagonist RU486.
  • High-dose Dex (100 µM) significantly reduced ATDC5 chondrocyte viability.
  • Autophagy induction correlated with decreased chondrocyte viability.

Conclusions:

  • High doses of GCs can induce autophagy in chondrocytes.
  • GC-induced autophagy in chondrocytes leads to reduced cell viability.
  • This mechanism may contribute to GC-induced skeletal development impairment.

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