title: Dietary fat interacts with PCBs to induce changes in lipid metabolism in mice deficient in low-density lipoprotein receptor.
abstract: There is evidence that dietary fat can modify the cytotoxicity of polychlorinated biphenyls (PCBs) and that coplanar PCBs can induce inflammatory processes critical in the pathology of vascular diseases. To test the hypothesis that the interaction of PCBs with dietary fat is dependent on the type of fat, low-density lipoprotein receptor-deficient (LDL-R(-/-)) mice were fed diets enriched with either olive oil or corn oil for 4 weeks. Half of the animals from each group were injected with PCB-77. Vascular cell adhesion molecule-1 (VCAM-1) expression in aortic arches was nondetectable in the olive-oil-fed mice but was highly expressed in the presence of PCB-77. PCB treatment increased liver neutral lipids and decreased serum fatty acid levels only in mice fed the corn-oil-enriched diet. PCB treatment increased mRNA expression of genes involved in inflammation, apoptosis, and oxidative stress in all mice. Upon PCB treatment, mice in both olive- and corn-oil-diet groups showed induction of genes involved in fatty acid degradation but with up-regulation of different key enzymes. Genes involved in fatty acid synthesis were reduced only upon PCB treatment in corn-oil-fed mice, whereas lipid transport/export genes were altered in olive-oil-fed mice. These data suggest that dietary fat can modify changes in lipid metabolism induced by PCBs in serum and tissues. These findings have implications for understanding the interactions of nutrients with environmental contaminants on the pathology of inflammatory diseases such as atherosclerosis.
authors.affiliation: Molecular and Cell Nutrition Laboratory, College of Agriculture and Graduate Center for Nutritional Sciences, University of Kentucky, Lexington, Kentucky 40536-0200, USA. bhenning@uky.edu
authors.forename: Bernhard
authors.initials: B
authors.lastname: Hennig
authors.forename: Gudrun
authors.initials: G
authors.lastname: Reiterer
authors.forename: Michal
authors.initials: M
authors.lastname: Toborek
authors.forename: Sergey V
authors.initials: SV
authors.lastname: Matveev
authors.forename: Alan
authors.initials: A
authors.lastname: Daugherty
authors.forename: Eric
authors.initials: E
authors.lastname: Smart
authors.forename: Larry W
authors.initials: LW
authors.lastname: Robertson
mesh_terms: D000818:Animals; D004032:Diet; D004041:Dietary Fats / Q000494:pharmacology*; D004347:Drug Interactions; D004785:Environmental Pollutants / Q000494:pharmacology* / Q000506:poisoning*; D051379:Mice; D011078:Polychlorinated Biphenyls / Q000494:pharmacology* / Q000506:poisoning*; D011973:Receptors, LDL / Q000187:drug effects* / Q000502:physiology*
chemical_list: D004041:Dietary Fats; D004785:Environmental Pollutants; D011973:Receptors, LDL; D011078:Polychlorinated Biphenyls