Cell Survival Signalling through PPARδ and Arachidonic Acid Metabolites in Neuroblastoma

Cell Survival Signalling through PPARδ and Arachidonic Acid Metabolites in Neuroblastoma

Retinoic acid (RA) has paradoxical effects on cancer cells: promoting cell death, differentiation and cell cycle arrest, or cell survival and proliferation. Arachidonic acid (AA) release occurs in response to RA treatment and, therefore, AA and its downstream metabolites may be involved in cell survival signalling. To test this, we inhibited phospholipase A2-mediated AA release, cyclooxygenases...

Inhibition of human malignant neuroblastoma cell DNA synthesis by lipoxygenase metabolites of arachidonic acid.

In vivo studies have shown that inhibitors of cyclooxygenase metabolism of arachidonic acid may diminish growth and metastasis of certain tumors. Because cyclooxygenase inhibition may increase the production of lipoxygenase products of arachidonic acid metabolism, we have investigated the effect of two such products, 12-hydroxyeicosatetraenoic acid (12-HETE) and 15-hydroxyeicosatetraenoic acid ...

Arachidonic Acid Metabolites in Inflammation

Regulation of arachidonic acid metabolites in macrophages

The lipids of mouse peritoneal macrophages contain high levels (25 mole percent) of esterified arachidonic acid (20:4). Following in vitro exposure to unopsonized zymosan, these cells synthesize and release oxygenated products of 20:4. Maximal levels of zymosan ingestion promote the release of 40-50% of the 20:4 content of cultures without loss of viabilitiy. Release of radiolabel from macropha...

Arachidonic acid metabolites regulate interleukin-1 production.

We have investigated the role of arachidonic acid metabolites in the regulation of interleukin-1 production by murine peritoneal macrophages. Indomethacin a potent inhibitor of prostaglandin synthesis caused a dose-dependent augmentation of lipopolysaccharide induced interleukin production (up to 7-fold at 5 microM). In contrast, lipoxygenase inhibitors, nordihydroguarietic acid and nafazatrom ...