15-Deoxy-Delta12,14-prostaglandin J2 inhibits IL-1beta-induced cyclooxygenase-2 expression in mesangial cells

Kidney Int. 2002 Jun;61(6):1957-67. doi: 10.1046/j.1523-1755.2002.00351.x.


Background: Cyclooxygenase-2 (COX-2), a key enzyme in the synthesis of prostaglandins, is induced in mesangial cells in response to proinflammatory cytokines. Recently, 15-deoxy-Delta12,14-prostaglandin J2 (15d-PGJ2), one of the natural ligands of peroxisome proliferator-activated receptor gamma (PPARgamma), has been reported to have an anti-inflammatory effect. Therefore, we examined the effect of 15d-PGJ2 on COX-2 expression in cultured rat mesangial cells.

Methods: Mesangial cells were incubated with 15d-PGJ2 for 30 minutes and then exposed to interleukin-1beta (IL-1beta). The expression of COX-2 mRNA and proteins was determined by Northern blot and immunoblot analyses, respectively. Accumulation of prostaglandin E2 (PGE2) was measured by an enzyme-linked immunosorbent assay (ELISA). Activities of mitogen-activated protein kinases (MAPKs) were evaluated by an immunoblot analysis. DNA binding activities of activator protein-1 (AP-1) or nuclear factor-kappaB (NF-kappaB) were examined by an electrophoretic mobility shift assay (EMSA). The activities of PPAR responsive elements (PPRE) and COX-2 promoter were measured by a luciferase reporter assay.

Results: 15D-PGJ2 significantly suppressed IL-1beta-induced COX-2 expression and PGE2 production, but thiazolidinediones, synthetic PPARgamma ligands, did not affect COX-2 expression. Moreover, the cells transfected with a PPRE luciferase reporter did not respond to 15d-PGJ2. IL-1beta rapidly activated extracellular signal-regulated kinase (ERK) and c-Jun NH2-terminal kinase (JNK), which were involved in the up-regulation of COX-2 induction, but 15d-PGJ2 inhibited the activation of these kinases. 15d-PGJ2 inhibited the IL-1beta-induced increase in binding activities of nuclear proteins to consensus AP-1 site and AP-1-like site of COX-2 promoter but not of NF-kappaB. IL-1beta was unable to activate the COX-2 promoter when the AP-1-like site was mutated.

Conclusions: These data suggest that 15d-PGJ2 inhibits IL-1beta-induced COX-2 expression, independent of PPARgamma activation, by suppression of ERK and JNK pathways and AP-1 activation in mesangial cells. Thus, 15d-PGJ2 may play an important role in the negative feedback mechanism of COX-2 expression in renal inflammation and may be useful as an anti-inflammatory agent.

MeSH terms

  • Animals
  • Cells, Cultured
  • Cyclooxygenase 2
  • Cyclooxygenase 2 Inhibitors
  • Cyclooxygenase Inhibitors / pharmacology*
  • DNA / metabolism
  • Dinoprostone / biosynthesis
  • Glomerular Mesangium / cytology
  • Glomerular Mesangium / enzymology*
  • Glomerular Mesangium / metabolism
  • Interleukin-1 / pharmacology*
  • Isoenzymes / antagonists & inhibitors*
  • Isoenzymes / genetics
  • Isoenzymes / metabolism
  • Male
  • Mitogen-Activated Protein Kinase Kinases / metabolism
  • NF-kappa B / physiology
  • Phosphorylation / drug effects
  • Promoter Regions, Genetic / physiology
  • Prostaglandin D2 / analogs & derivatives*
  • Prostaglandin D2 / pharmacology*
  • Prostaglandin-Endoperoxide Synthases / genetics
  • Prostaglandin-Endoperoxide Synthases / metabolism
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, Cytoplasmic and Nuclear / physiology
  • Transcription Factor AP-1 / metabolism
  • Transcription Factors / physiology


  • 15-deoxy-delta(12,14)-prostaglandin J2
  • Cyclooxygenase 2 Inhibitors
  • Cyclooxygenase Inhibitors
  • Interleukin-1
  • Isoenzymes
  • NF-kappa B
  • Receptors, Cytoplasmic and Nuclear
  • Transcription Factor AP-1
  • Transcription Factors
  • DNA
  • Cyclooxygenase 2
  • Prostaglandin-Endoperoxide Synthases
  • Mitogen-Activated Protein Kinase Kinases
  • Dinoprostone
  • Prostaglandin D2