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Journal Article
Research Support, U.S. Gov't, P.H.S.
Effects of interleukin-1 alpha on arachidonic acid metabolism in human osteosarcoma osteoblastic cells.
The effects of interleukin-1 alpha (IL-1 alpha) on arachidonic acid (AA) metabolism were studied in the human osteosarcoma cell lines, G292 and SaOS-2. The cells were prelabeled with 3H-arachidonic acid. Radiolabeled metabolites were measured by reversed-phase high-pressure liquid chromatography with a radioactive detector. Indomethacin inhibited prostaglandin E2 (PGE2) production without affecting lipoxygenase (LO) products in G292 cells. In the G292 cells, IL-1 alpha (50 U/ml) induced a 10-fold increase in PGE2 production at all the incubation times tested, and a significant two-fold increase in 5 hydroxyeicosatetraenoic acid (HETE) formation after 48 h. These effects were not seen in SaOS-2 cells under identical conditions. These results suggest that, although some osteosarcomal cell lines may not respond directly to IL-1 with effects on AA metabolism, the mechanism of its action in others may involve modulation of both cyclooxygenase (CO) and LO pathways.
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