Colon Carcinoma Cell Growth Is Associated with Prostaglandin E2/EP4 Receptor-evoked ERK Activation
| Autor: | Richard M. Breyer, Jason D. Morrow, Ines Macias-Perez, Shouzuo Wei, Aaron N. Hata, J. Capdevila, Xuexian Yan, Ambra Pozzi |
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| Rok vydání: | 2004 |
| Předmět: |
Male
MAPK/ERK pathway medicine.medical_specialty medicine.medical_treatment Indomethacin Adenocarcinoma Pharmacology Biochemistry Dinoprostone Mice chemistry.chemical_compound Cell Line Tumor Internal medicine Cyclic AMP medicine Animals Humans Receptors Prostaglandin E Cyclooxygenase Inhibitors Prostaglandin E2 Receptor Molecular Biology Mice Inbred BALB C Arachidonic Acid Cyclooxygenase 2 Inhibitors biology Kinase Cell growth Membrane Proteins Prostanoid Cell Biology Enzyme Activation Isoenzymes Endocrinology chemistry Cyclooxygenase 2 Prostaglandin-Endoperoxide Synthases Colonic Neoplasms Cyclooxygenase 1 Prostaglandins biology.protein lipids (amino acids peptides and proteins) Cyclooxygenase Mitogen-Activated Protein Kinases Receptors Prostaglandin E EP4 Subtype Cell Division Prostaglandin E medicine.drug |
| Zdroj: | Journal of Biological Chemistry. 279:29797-29804 |
| ISSN: | 0021-9258 |
| Popis: | Cyclooxygenase (COX) and its prostanoid metabolites have been implicated in the control of cell survival; however, their role as mitogens remains undefined. To better understand the role of prostanoids on cell growth, we used mouse colon adenocarcinoma (CT26) cells to investigate the role of prostaglandin E(2) (PGE(2)) in cell proliferation. CT26 cells express both COX1 and COX2 and metabolize arachidonic acid to PGE(2.) Treatment with indomethacin, or COX-selective inhibitors, prevents PGE(2) biosynthesis and CT26 cell proliferation. The anti-proliferative effects of COX inhibition are rescued specifically by treatment with PGE(2) or the EP4 receptor-selective agonist PGE(1)-OH via phosphatidylinositol 3-kinase/extracellular signal-regulated kinase (ERK) activation, thus providing a functional link between PGE(2)-induced cell proliferation and EP4-mediated ERK signaling. Indomethacin or COX2 inhibitors, but not COX1 inhibitors, reduced the size and number of CT26-derived tumors in vivo. These inhibitory effects are paralleled by marked declines in the levels of tumor PGE(2), suggesting that their anti-tumor effects are directly associated with the inhibition of COX2 enzymatic activity. The described anti-tumor effects of indomethacin are evident whether it is administered at the time of, or 7 days after, tumor cell injection, suggesting that it has tumor preventive and therapeutic actions. Furthermore, the observation that indomethacin increases the survival rates of tumor-bearing mice, even after withdrawal of the drug, indicates that its effects are long lasting and that it may be potentially useful for the prevention and the clinical management of human cancers. |
| Databáze: | OpenAIRE |
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