Thromb Haemost 1999; 82(05): 1545-1561
DOI: 10.1055/s-0037-1614869
Rapid Communications
Schattauer GmbH

Comparative Study of Vanadate- and Phorbol Ester-induced Cyclo-oxygenase-2 Expression in Human Endothelial Cells

Authors

  • Kenzo Hirai

    1   From the Department of Hematology and Oncology, Clinical Sciences for Pathological Organs, Graduate School of Medicine and Department of Biophysics, Graduate School of Science, Kyoto University, Japan
  • Yasuharu Ezumi

    1   From the Department of Hematology and Oncology, Clinical Sciences for Pathological Organs, Graduate School of Medicine and Department of Biophysics, Graduate School of Science, Kyoto University, Japan
  • Eisuke Nishida

    1   From the Department of Hematology and Oncology, Clinical Sciences for Pathological Organs, Graduate School of Medicine and Department of Biophysics, Graduate School of Science, Kyoto University, Japan
  • Takashi Uchiyama

    1   From the Department of Hematology and Oncology, Clinical Sciences for Pathological Organs, Graduate School of Medicine and Department of Biophysics, Graduate School of Science, Kyoto University, Japan
  • Hiroshi Takayama

    1   From the Department of Hematology and Oncology, Clinical Sciences for Pathological Organs, Graduate School of Medicine and Department of Biophysics, Graduate School of Science, Kyoto University, Japan
Further Information

Publication History

Received 06 October 1998

Accepted after resubmission 01 July 1999

Publication Date:
09 December 2017 (online)

Preview

Summary

Our previous study showed that vanadate, an inhibitor of protein tyrosine phosphatases, induced the expression of cyclo-oxygenase (COX)-2 in a protein-tyrosine-kinase (PTK)-dependent manner in human umbilical vein endothelial cells (HUVEC). Here, we further compared the actions of vanadate and phorbol 12-myristate 13-acetate (PMA), an activator of protein kinase C (PKC), on induction of COX-2 with special reference to mitogen-activated protein kinases (MAPKs) in HUVEC. Vanadate induced activation of three families of MAPKs, extracellular signal-regulated kinases 1 and 2 (ERK1/2), p38, and c-Jun amino-terminal kinase (JNK) 1, while activation of ERK1/2 alone was induced by PMA. The former activation by vanadate and the latter one by PMA were inhibited by tyrphostin-47, an inhibitor of PTKs, and by Ro31-8220, a PKC inhibitor, respectively. Either tyrphostin-47, PD98059, a specific inhibitor of the upstream kinase toward ERK1/2, or SB203580, a specific inhibitor of p38, completely suppressed vanadate-induction of COX-2 mRNA and protein. On the other hand, PMA-induction of COX-2 mRNA and protein was abolished by Ro31-8220 or PD98059 but not by SB203580. These data indicate that PMA-induced and PKC-dependent expression of COX-2 requires mainly activation of ERK1/2 among MAPKs, while activation of both ERK1/2 and p38 or possibly of all three families of MAPKs is necessary for vanadate-induced and PTK-dependent expression of COX-2.