Abstract
Cyclooxygenase-2 (COX-2) is an inducible isoform of the COX family of enzymes central to the synthesis of pro-inflammatory prostaglandins. Induction of COX-2 is mediated by many endogenous and exogenous molecules that include pro-inflammatory cytokines and bacterial lipopolysaccharide (LPS). It has been demonstrated that COX-2 can also be induced by diclofenac in cultured J774.2 macrophages. This induction was delayed compared to COX-2 induced by LPS and paracetamol selectively inhibited activity of this protein. The aim of the present study was to determine the transcription factor involved in the production of COX-2 after treatment of J774.2 cells with 500 μM diclofenac. Pre-treatment of cells with the peroxisome proliferator-activated receptor-γ (PPAR-γ) antagonists GW9662 (0.1–1 μM) or biphenol A Diglycidyl Ether (100–200 μM) resulted in reduction of the induction of COX-2 by diclofenac, but not by LPS. Induction of COX-2 by the PPAR-γ agonist 15deoxyΔ12,14prostaglandin J2 was also reduced when the cells were pre-treated with the PPAR-γ antagonists BADGE or GW9662. On the other hand, pre-treatment of cells with the nuclear factor-kappa-B (NF-κB) Super-repressor IκBα (150–600 nM) reduced the induction of COX-2 by LPS, but not by diclofenac. We, therefore, have identified that PPAR-γ activation is a requirement for COX-2 induction after diclofenac stimulation of J774.2 cells. These results along with the finding that treatment of J774.2 macrophages with diclofenac resulted in the release of the anti-inflammatory cytokines, interleukin-10 and transforming growth factor-β suggest that the diclofenac-induced COX-2 protein may possess anti-inflammatory actions.
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The financial support for this work was provided by the Biotechnological and Biological Sciences Research Council (BBSRC) and GlaxoSmithKline (GSK).
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Ayoub, S.S., Botting, R.M., Joshi, A.N. et al. Activation of macrophage peroxisome proliferator-activated receptor-γ by diclofenac results in the induction of cyclooxygenase-2 protein and the synthesis of anti-inflammatory cytokines. Mol Cell Biochem 327, 101–110 (2009). https://doi.org/10.1007/s11010-009-0048-y
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DOI: https://doi.org/10.1007/s11010-009-0048-y