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- W1963864517 abstract "Alterations in arachidonic acid metabolism are involved in human carcinogenesis. Cyclooxygenase (COX) and lipoxygenase (LOX) are key enzymes in this metabolism. We analyzed the expression of 15S-lipoxygenase-2 (15-LOX-2) mRNA and protein in surgical specimens from normal (N=37) and malignant (63) esophageal tissues using in situ hybridization and immunohistochemistry (IHC), in normal (1), premalignant (1), malignant (5) esophageal cell lines using Northern and Western blotting. 15-LOX-2 was expressed in normal esophageal epithelial cells (EECs) at the highest levels, whereas an SV40-immortalized HET-1A line and three of five esophageal cancer cell lines failed to express it at detectable levels. 15-LOX-2 was detected in 76% (28/37) of the normal esophageal mucosae, but only in 46% (29/63) of the cancer specimens using IHC (P<.01). Transient transfection of 15-LOX-2 expression vectors into esophageal cancer cells significantly inhibited the proliferation of 15-LOX-2-negative cancer cells. The COX-2 inhibitor, NS398, induced 15LOX-2 expression in esophageal cancer cells, which is associated with reduced cell viability. This study demonstrated that 15-LOX-2 expression is lost in esophageal cancers and that the induction of 15-LOX-2 can inhibit cancer cell proliferation. Further investigation of the effects of nonsteroidal anti-inflammatory drugs on 15-LOX-2 expression and apoptosis in esophageal cancer cells may be warranted." @default.
- W1963864517 created "2016-06-24" @default.
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- W1963864517 date "2003-03-01" @default.
- W1963864517 modified "2023-10-17" @default.
- W1963864517 title "Reduced 15S-Lipoxygenase-2 Expression in Esophageal Cancer Specimens and Cells and Upregulation In Vitro by the Cyclooxygenase-2 Inhibitor, NS398" @default.
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- W1963864517 doi "https://doi.org/10.1016/s1476-5586(03)80003-9" @default.
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