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Functional role of extracellular signal-regulated kinase activation and c-Jun induction in phorbol ester-induced promoter activation of human 12(S)-lipoxygenase gene

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Abstract

The functional role of mitogen-activated protein kinase (MAPK) signaling and c-Jun induction in phorbol 12-myristate 13-acetate (PMA)-induced human 12(S)-lipoxygenase gene expression was studied in human epidermoid carcinoma A431 cells. Among the family of MAPK, PMA only increased the activity of extracellular signal-regulated kinase (ERK). Treatment of cells with PD98059, which is an inhibitor of mitogen-activated protein kinase kinase (MEK), decreased the PMA-induced expression of 12(S)-lipoxygenase. Transfection of cells with Ras, Raf and ERK2 dominant negative mutants inhibited the PMA-induced promoter activation of the 12(S)-lipoxygenase gene in all cases. PMA-induced expression of c-Jun was inhibited by pretreatment with PD98059. Following treatment with PMA, the interaction between c-Jun and simian virus 40 promoter factor 1 (Sp1) in cells increased with time. Enhancement of binding between the c-Jun-Sp1 complex and the Sp1 oligonucleotide was observed in cells treated with PMA, suggesting the possible interaction of c-Jun-Sp1 with GC-rich binding sites in the gene promoter. These results indicate that PMA treatment induced ERK activation mainly through the Raf-MEK-ERK signaling pathway following induction of c-Jun expression, and the formation of the c-Jun-Sp1 complex. Finally, PMA activated the promoter activity of the 12(S)-lipoxygenase gene in cells overexpressing protein kinase C (PKC)δ but not PKCα, indicating that PKCδ played the functional role in mediating the gene activation of 12(S)-lipoxygenase induced by PMA.

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Chen, B., Tsai, T., Huang, H. et al. Functional role of extracellular signal-regulated kinase activation and c-Jun induction in phorbol ester-induced promoter activation of human 12(S)-lipoxygenase gene. J Biomed Sci 9, 156–165 (2002). https://doi.org/10.1007/BF02256027

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Key Words

  • Phorbol 12-myristate 13-acetate
  • Extracellular signal-regulated kinase
  • c-Jun
  • Sp1
  • 12(S)-Lipoxygenase