title: Conjugated linoleic acid reduction of murine mammary tumor cell growth through 5-hydroxyeicosatetraenoic acid.
abstract: Conjugated linoleic acid (CLA) is a dietary fatty acid that has been shown to reduce tumorigenesis and metastasis in breast, prostate and colon cancer in animals. However, the mechanism of its action has not been clarified. The goal of this study was to determine whether CLA altered mouse mammary tumor cell growth and whether specific metabolites of the lipoxygenase pathway were involved in CLA action. Both t10, c12-CLA and a lipoxygenase inhibitor, but not c9, t11-CLA or linoleic acid (LA), reduced mouse mammary tumor cell viability and growth by inducing apoptosis and reducing cell proliferation. t10, c12-CLA reduced the production of the 5-lipoxygenase metabolite, 5-hydroxyeicosatetraenoic acid (5-HETE). That effect was not seen with c9, t11-CLA or LA. Adding 5-HETE back to tumor cells reduced the t10, c12-CLA effect on both apoptosis and cell proliferation. These data suggest that t10, c12-CLA reduction of tumor cell growth may involve the suppression of the 5-lipoxygenase metabolite, 5-HETE, with subsequent effects on apoptosis and cell proliferation.
authors.affiliation: Department of Cell Biology and Human Anatomy, University of California, School of Medicine, One Shields Avenue, Davis, CA 95616-8641, USA.
authors.forename: Jung-Hyun
authors.initials: JH
authors.lastname: Kim
authors.forename: Neil E
authors.initials: NE
authors.lastname: Hubbard
authors.forename: Vincent
authors.initials: V
authors.lastname: Ziboh
authors.forename: Kent L
authors.initials: KL
authors.lastname: Erickson
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects*; D002470:Cell Survival / Q000187:drug effects; D002630:Chemotactic Factors / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D005260:Female; D006801:Humans; D006893:Hydroxyeicosatetraenoic Acids / Q000378:metabolism* / Q000494:pharmacology; D044243:Linoleic Acids, Conjugated / Q000737:chemistry / Q000378:metabolism / Q000494:pharmacology* / Q000627:therapeutic use; D015674:Mammary Neoplasms, Animal / Q000188:drug therapy / Q000378:metabolism* / Q000473:pathology; D051379:Mice
chemical_list: D002630:Chemotactic Factors; D006893:Hydroxyeicosatetraenoic Acids; D044243:Linoleic Acids, Conjugated; C022022:5-hydroxy-6,8,11,14-eicosatetraenoic acid