INHIBITION OF HUMAN-MALIGNANT NEURO-BLASTOMA CELL-DNA SYNTHESIS BY LIPOXYGENASE METABOLITES OF ARACHIDONIC-ACID

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  • 1 January 1985
    • journal article
    • research article
    • Vol. 45  (2) , 561-563
Abstract
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, the effect of 2 such products, 12-hydroxyeicosatetraenoic acid (12-HETE) and 15-hydroxyeicosatetraenoic acid (15-HETE) on tumor cell proliferation in vitro was investigated. When neuroblastoma cells (SK-N-SH) in culture were treated with 12-HETE for 18 h, incorporation of [3H]thymidine was inhibited up to 64% at concentrations from 20-50 .mu.M. Under the same conditions, 15-HETE resulted in inhibition of up to 46%, while arachidonic acid had no apparent effect. When evaluated in the presence of serum, 12-HETE at a concentration of 120 .mu.M produced a 20.6 .+-. 2.8% (SE) inhibition of the increase in total DNA content over 48 h, while 15-HETE at this concentration produced a 16.5 .+-. 5.3% inhibition. 12-HETE, the product of platelet lipoxygenase, and 15-HETE, a product of neutrophil and lymphocyte lipoxygenases, can inhibit human neuroblastoma cell growth in vitro and may play a role in the effect of cyclooxygenase inhibitors on tumor growth in vivo.