title: 15-Lipoxygenase-1 has anti-tumorigenic effects in colorectal cancer.
abstract: The localization of 15-lipoxygenase-1 (15-LO-1) in human colorectal carcinoma and normal adjacent tissue was examined using immunohistochemistry. In normal tissues, 15-LO-1 was strongly localized in the mucosal epithelium. Conversely, in tumor tissues, staining for 15-LO-1 was dispersed throughout the tissue, weak in neoplastic epithelium, and strong in stromal inflammatory cells. The addition of 50 microM 13(S)-hydroxyeicosatetraenoic acid (HODE), resulted in decreased cell proliferation after 72 h, but lower concentrations (5 or 10 microM) had no effect compared to vehicle treated Caco-2 cells. In addition, 13(S)-HODE had no effect on apoptosis or differentiation of the Caco-2 cells. Microarray analyses of RNA from Caco-2 cells treated with 5 microM 13(S)-HODE revealed changes in 17 genes. HCT-116 colorectal cells were stably transfected with 15-LO-1. In athymic nude mice, transplantable tumors derived from 15-LO-1 HCT-116 cells were smaller than tumors derived from vector HCT-116 cells. These data demonstrate that 13(S)-HODE induces changes in gene expression and has anti-tumorigenic effects.
authors.affiliation: Laboratory of Molecular Carcinogenesis, National Institute of Environmental Health Sciences, National Institutes of Health, PO Box 12233, Research Triangle Park, NC 27709, USA.
authors.forename: Jennifer B
authors.initials: JB
authors.lastname: Nixon
authors.forename: Kyung Su
authors.initials: KS
authors.lastname: Kim
authors.forename: Patricia W
authors.initials: PW
authors.lastname: Lamb
authors.forename: Frank G
authors.initials: FG
authors.lastname: Bottone
authors.forename: Thomas E
authors.initials: TE
authors.lastname: Eling
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000378:metabolism*; D017209:Apoptosis / Q000187:drug effects; D001093:Arachidonate 15-Lipoxygenase / Q000378:metabolism*; D018938:Caco-2 Cells; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D045744:Cell Line, Tumor; D015179:Colorectal Neoplasms / Q000201:enzymology* / Q000473:pathology*; D018450:Disease Progression; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects; D006801:Humans; D007150:Immunohistochemistry; D007249:Inflammation / Q000201:enzymology / Q000473:pathology; D008041:Linoleic Acids / Q000494:pharmacology; D008297:Male; D051379:Mice; D009368:Neoplasm Transplantation; D020411:Oligonucleotide Array Sequence Analysis
chemical_list: D000970:Antineoplastic Agents; D008041:Linoleic Acids; C024348:13-hydroxy-9,11-octadecadienoic acid; D001093:Arachidonate 15-Lipoxygenase