Expression of Cyclooxygenase 2 by Prostaglandin E2 in Human Endometrial Adenocarcinoma Cell Line HEC-1B1

Abstract The regulation of expression of cyclooxygenase 2 (COX-2) was investigated by treatment with PGE2 in human endometrial adenocarcinoma cell line HEC-1B. One μM PGE2 could stimulate the expression of COX-2 approximately twofold in this cell line. The same concentration of PGE2 also stimulated activation of mitogen-activated protein kinase (MAP kinase) and protein kinase B (PKB). PGE2-induced MAP kinase activation was sensitive to a MAP kinase kinase (MEK) inhibitor, PD098059, and a protein kinase A inhibitor, H-89. PD098059 and H-89 also partially inhibited the expression of COX-2 stimulated by PGE2. PGE2 could stimulate the activation of PKB, which was sensitive to phosphatidylinositol-3-OH kinase (PI3K) inhibitor, wortmannin. Whereas wortmannin alone partially inhibited the expression of COX-2, a combination of wortmannin and PD098059 totally inhibited PGE2-mediated COX-2 expression. These results suggest that MAP kinase and PI3K pathways are stimulated with PGE2, and that both of these pathways are involved in the expression of COX-2. In addition, they also suggest that protein kinase A remains upstream of PGE2-induced activation of MAP kinase in HEC-1B cells.

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