TF/FVIIa/PAR2 promotes cell proliferation and migration via PKCα and ERK-dependent c-Jun/AP-1 pathway in colon cancer cell line SW620

Tumour Biol. 2013 Oct;34(5):2573-81. doi: 10.1007/s13277-013-0803-2. Epub 2013 Apr 25.

Abstract

Our previous study has demonstrated that tissue factor-factor VIIa (TF/FVIIa) complex promotes the proliferation and migration of colon cancer cell line SW620 through the activation of protease-activated receptor 2 (PAR2). In the current study, the underlying molecular mechanisms of TF/FVIIa/PAR2 signaling in SW620 cells were further explored, with the focus on the role of activator protein-1 (AP-1) subunit c-Jun. The results revealed that PAR2-AP and FVIIa could upregulate c-Jun expression and c-Jun phosphorylation in SW620 cells in a time-dependent manner. The effect of FVIIa was significantly blocked by anti-TF and anti-PAR2 antibodies. Protein kinase Cα (PKCα) inhibitor safingol and extracellular signal-regulated kinase 1 and 2 (ERK1/2) inhibitor U0126 abrogated the activation of c-Jun. In contrast, Ca(2+) chelators EGTA and thapsigargin, and p38MAPK inhibitor SB203580 had no effect. Suppression of c-Jun/AP-1 activation using a natural inhibitor curcumin decreased the expression of caspase-3, MMP-9, and TF, as well as the proliferation and migration of SW620 cells induced by PAR2-AP or FVIIa. Collectively, our findings suggest that c-Jun/AP-1 activation is required for TF/FVIIa/PAR2-induced SW620 cell proliferation and migration. PKCα and ERK1/2 are located upstream of c-Jun/AP-1 in this signaling pathway. Pharmacological inhibition of this pathway might be a novel strategy for colon cancer therapy.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Antineoplastic Agents / pharmacology
  • Butadienes / pharmacology
  • Cell Cycle / drug effects
  • Cell Line, Tumor
  • Cell Movement*
  • Cell Proliferation*
  • Colonic Neoplasms
  • Curcumin / pharmacology
  • Extracellular Signal-Regulated MAP Kinases / antagonists & inhibitors
  • Extracellular Signal-Regulated MAP Kinases / metabolism
  • Factor VIIa / physiology*
  • Humans
  • MAP Kinase Signaling System*
  • Nitriles / pharmacology
  • Protein Kinase C-alpha / antagonists & inhibitors
  • Protein Kinase C-alpha / metabolism*
  • Proto-Oncogene Proteins c-jun / metabolism
  • Receptor, PAR-2 / metabolism*
  • Sphingosine / analogs & derivatives
  • Sphingosine / pharmacology
  • Thromboplastin / physiology*
  • Transcription Factor AP-1 / antagonists & inhibitors
  • Transcription Factor AP-1 / metabolism

Substances

  • Antineoplastic Agents
  • Butadienes
  • Nitriles
  • Proto-Oncogene Proteins c-jun
  • Receptor, PAR-2
  • Transcription Factor AP-1
  • U 0126
  • Thromboplastin
  • PRKCA protein, human
  • Protein Kinase C-alpha
  • Extracellular Signal-Regulated MAP Kinases
  • Factor VIIa
  • Curcumin
  • Sphingosine
  • safingol