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DIO2 modifies inflammatory responses in chondrocytes.

Publication ,  Journal Article
Cheng, AWM; Bolognesi, M; Kraus, VB
Published in: Osteoarthritis Cartilage
May 2012

OBJECTIVE: Selenium neutralizes interleukin-1β (IL-1β) induced inflammatory responses in chondrocytes. We investigated potential mechanisms for this through in vitro knock down of three major selenoproteins, Iodothyronine Deiodinase-2 (DIO2), Glutathione Peroxidase-1 (GPX1), and Thioredoxin Reductase-1 (TR1) in primary human chondrocytes. METHODS: Primary human chondrocytes were transfected with scrambled small interfering ribonucleic acid (siRNA) or siRNA specific for DIO2, GPX1 and TR1. After 48 h, transfected cells were cultured in serum free media for 48 h, with or without 10 pg/ml IL-1β for the final 24h. The efficiency of siRNAs was confirmed by quantitative Real Time-Polymerase Chain Reaction (qRT-PCR) and Western blot analysis. The gene expression, by qRT-PCR, of cyclooxygenase-2 (COX2), IL-1β, and Liver X receptor (LXR) alpha and beta was evaluated to determine the impact of selenoprotein knockdown on inflammatory responses in chondrocytes. RESULTS: The messenger RNA (mRNA) expression of DIO2, GPX1, and TR1 was significantly decreased by the specific siRNAs (reduced 56%, P=0.0004; 96%, P<0.0001; and 66%, P<0.0001, respectively). Suppression of DIO2, but not GPX1 or TR1, significantly increased (~2-fold) both basal (P=0.0005) and IL-1β induced (P<0.0001) COX2 gene expression. Similarly, suppression of DIO2 significantly increased (∼9-fold) IL-1β induced IL-1β gene expression (P=0.0056) and resulted in a 32% (P=0.0044) decrease in LXRα gene expression but no effect on LXRβ. CONCLUSIONS: Suppression of the selenoprotein DIO2 resulted in strong pro-inflammatory effects with increased expression of inflammatory mediators, IL-1β and COX2, and decreased expression of LXRα suggesting that this may be the upstream target through which the anti-inflammatory effects of DIO2 are mediated.

Duke Scholars

Published In

Osteoarthritis Cartilage

DOI

EISSN

1522-9653

Publication Date

May 2012

Volume

20

Issue

5

Start / End Page

440 / 445

Location

England

Related Subject Headings

  • Transfection
  • Thioredoxin Reductase 1
  • RNA, Small Interfering
  • Orphan Nuclear Receptors
  • Liver X Receptors
  • Iodothyronine Deiodinase Type II
  • Iodide Peroxidase
  • Interleukin-1beta
  • Inflammation Mediators
  • Humans
 

Citation

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Cheng, A. W. M., Bolognesi, M., & Kraus, V. B. (2012). DIO2 modifies inflammatory responses in chondrocytes. Osteoarthritis Cartilage, 20(5), 440–445. https://doi.org/10.1016/j.joca.2012.02.006
Cheng, A. W. M., M. Bolognesi, and V. B. Kraus. “DIO2 modifies inflammatory responses in chondrocytes.Osteoarthritis Cartilage 20, no. 5 (May 2012): 440–45. https://doi.org/10.1016/j.joca.2012.02.006.
Cheng AWM, Bolognesi M, Kraus VB. DIO2 modifies inflammatory responses in chondrocytes. Osteoarthritis Cartilage. 2012 May;20(5):440–5.
Cheng, A. W. M., et al. “DIO2 modifies inflammatory responses in chondrocytes.Osteoarthritis Cartilage, vol. 20, no. 5, May 2012, pp. 440–45. Pubmed, doi:10.1016/j.joca.2012.02.006.
Cheng AWM, Bolognesi M, Kraus VB. DIO2 modifies inflammatory responses in chondrocytes. Osteoarthritis Cartilage. 2012 May;20(5):440–445.
Journal cover image

Published In

Osteoarthritis Cartilage

DOI

EISSN

1522-9653

Publication Date

May 2012

Volume

20

Issue

5

Start / End Page

440 / 445

Location

England

Related Subject Headings

  • Transfection
  • Thioredoxin Reductase 1
  • RNA, Small Interfering
  • Orphan Nuclear Receptors
  • Liver X Receptors
  • Iodothyronine Deiodinase Type II
  • Iodide Peroxidase
  • Interleukin-1beta
  • Inflammation Mediators
  • Humans