Open Access

Effect of autophagy induced by dexamethasone on senescence in chondrocytes

  • Authors:
    • Enxing Xue
    • Yu Zhang
    • Bing Song
    • Jun Xiao
    • Zhanjun Shi
  • View Affiliations

  • Published online on: August 22, 2016     https://doi.org/10.3892/mmr.2016.5662
  • Pages: 3037-3044
  • Copyright: © Xue et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

Metrics: Total Views: 0 (Spandidos Publications: | PMC Statistics: )
Total PDF Downloads: 0 (Spandidos Publications: | PMC Statistics: )


Abstract

The aim of the current study was to explore the effects of dexamethasone (DXM) on autophagy and senescence in chondrocytes. Collagen II and aggrecan were examined in normal chondrocytes isolated from Sprague‑Dawley rats. Following stimulation with DXM, LysoTracker Red staining, monodansylcadaverine (MDC) staining, green fluorescent protein‑red fluorescent protein‑light chain 3 (LC3) and western blotting were used to detect autophagy levels in the chondrocytes. Mechanistic target of rapamycin (mTOR) pathway‑associated molecules were investigated by western blotting. Cell senescence was analyzed by senescence‑associated (SA)‑β‑galactosidase (β‑gal) staining. A dose‑dependent increase in the number of autophagic vacuoles was observed in the DXM‑treated chondrocytes, as demonstrated by LysoTracker Red and MDC staining. A dose‑dependent increase in autophagosome formation was observed in the DXM‑treated chondrocytes. Expression of LC3‑II and beclin‑1 was increased by DXM, in particular in the cells treated with DXM for 4 days. However, P62 expression was reduced as a result of treatment. SA‑β‑gal staining indicated that DXM increased cell senescence. Notably, DXM‑induced cell senescence was exacerbated by the autophagic inhibitor 3‑MA. Autophagy induced by DXM protected chondrocytes from senescence, and it is suggested that the mTOR pathway may be involved in the activation of DXM‑induced autophagy.
View Figures
View References

Related Articles

Journal Cover

October-2016
Volume 14 Issue 4

Print ISSN: 1791-2997
Online ISSN:1791-3004

Sign up for eToc alerts

Recommend to Library

Copy and paste a formatted citation
x
Spandidos Publications style
Xue E, Zhang Y, Song B, Xiao J and Shi Z: Effect of autophagy induced by dexamethasone on senescence in chondrocytes. Mol Med Rep 14: 3037-3044, 2016.
APA
Xue, E., Zhang, Y., Song, B., Xiao, J., & Shi, Z. (2016). Effect of autophagy induced by dexamethasone on senescence in chondrocytes. Molecular Medicine Reports, 14, 3037-3044. https://doi.org/10.3892/mmr.2016.5662
MLA
Xue, E., Zhang, Y., Song, B., Xiao, J., Shi, Z."Effect of autophagy induced by dexamethasone on senescence in chondrocytes". Molecular Medicine Reports 14.4 (2016): 3037-3044.
Chicago
Xue, E., Zhang, Y., Song, B., Xiao, J., Shi, Z."Effect of autophagy induced by dexamethasone on senescence in chondrocytes". Molecular Medicine Reports 14, no. 4 (2016): 3037-3044. https://doi.org/10.3892/mmr.2016.5662