Both NF-κB and c-Jun/AP-1 involved in anti-β2GPI/β2GPI-induced tissue factor expression in monocytes

Thromb Haemost. 2013 Apr;109(4):643-51. doi: 10.1160/TH12-09-0655. Epub 2013 Mar 7.

Abstract

Our previous data has demonstrated that Toll-like receptor 4 (TLR4) and its signalling pathway can contribute to anti-β2-glycoprotein I/β2-glycoprotein I (anti-β2GPI/β2GPI) -induced tissue factor (TF) expression in human blood monocytes and acute monocytic leukaemia cell line THP-1. However, its downstream nuclear transcription factors have not been well explored. In the current study, we further investigated whether nuclear factor kappa B (NF-κB) and activator protein (AP-1) were activated and their roles in anti-β2GPI/β2GPI complex stimulating TF expression. The results showed that treatment of the cells with anti-β2GPI (10μg/ml)/β2GPI (100 mg/ml) complex could markedly increase the levels of phosphorylated NF-κB (p-NF-κB p65) and c-Jun/AP-1 (p-c-Jun), as well as TF expression. Both NF-κB inhibitor PDTC (20 μM) and AP-1 inhibitor curcumin (25 mM) could attenuate TF expression induced by anti-β2GPI/β2GPI or APS-IgG/β2GPI complex. Combination of any two inhibitors of MAPKs (SB203580/U0126 or SB203580/SP600125 or U0126/SP600125) could decrease activation of NF-κB. SB203580/SP600125 or U0126/SP600125, but not SB203580/U0126, could reduce the phosphorylation of c-Jun/AP-1. Neither NF-κB nor c-Jun/AP-1 activation caused by anti-β2GPI/β2GPI complex could be affected by TLR4 inhibitor TAK-242. In conclusion, our results indicate that both NF-κB and c-Jun/AP-1 can be activated and play important roles in the process of anti-β2GPI/β2GPI-induced TF expression in monocytes, thereby contributing to the pathological processes of antiphospholipid syndrome.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antibodies, Antiphospholipid / metabolism*
  • Antigen-Antibody Complex / metabolism
  • Cell Line, Tumor
  • Humans
  • Monocytes / drug effects
  • Monocytes / immunology
  • Monocytes / metabolism*
  • NF-kappa B / metabolism*
  • Phosphorylation
  • Protein Kinase Inhibitors / pharmacology
  • Proto-Oncogene Proteins c-jun / metabolism*
  • Signal Transduction / drug effects
  • Thromboplastin / genetics
  • Thromboplastin / metabolism*
  • Time Factors
  • Transcription Factor AP-1 / antagonists & inhibitors
  • Transcription Factor AP-1 / metabolism*
  • Transcription Factor RelA / metabolism
  • Up-Regulation
  • beta 2-Glycoprotein I / immunology
  • beta 2-Glycoprotein I / metabolism*

Substances

  • Antibodies, Antiphospholipid
  • Antigen-Antibody Complex
  • NF-kappa B
  • Protein Kinase Inhibitors
  • Proto-Oncogene Proteins c-jun
  • RELA protein, human
  • Transcription Factor AP-1
  • Transcription Factor RelA
  • beta 2-Glycoprotein I
  • Thromboplastin