Quantitative proteomics analysis reveals perturbation of lipid metabolic pathways in the liver of Atlantic cod (Gadus morhua) treated with PCB 153.
PCB 153 is one of the most abundant PCB congeners detected in biological samples. It is a persistent compound that is still present in the environment despite the ban on production and use of PCBs in the late 1970s. It has strong tendencies to bioaccumulate and biomagnify in biota, and studies have suggested that it is an endocrine and metabolic disruptor. In order to study mechanisms of toxicity, we exposed Atlantic cod (Gadus morhua) to various doses of PCB 153 (0, 0.5, 2 and 8mg/kg body weight) for two weeks and examined the effects on expression of liver proteins using label-free quantitative proteomics. Label-free liquid chromatography-mass spectrometry analysis of the liver proteome resulted in the quantification of 1272 proteins, of which 78 proteins were differentially regulated in the PCB 153-treated dose groups compared to the control group. Functional enrichment analysis showed that pathways significantly affected are related to lipid metabolism, cytoskeletal remodeling, cell cycle and cell adhesion. Importantly, the main effects appear to be on lipid metabolism, with up-regulation of enzymes in the de novo fatty acid synthesis pathway, consistent with previous transcriptomics results. Increased plasma triglyceride levels were also observed in the PCB 153 treated fish, in agreement with the induction of the lipogenic genes and proteins. The results suggest that PCB 153 perturbs lipid metabolism in the Atlantic cod liver. Elevated levels of lipogenic enzymes and plasma triglycerides further suggest increased synthesis of fatty acids and triglycerides.
Department of Biology, University of Bergen, Norway. Electronic address: Fekadu.Yadetie@uib.no.
Fekadu
F
Yadetie
Department of Biomedicine, Proteomics Unit (PROBE) at the University of Bergen, Norway. Electronic address: Eysteino@gmail.com.
Eystein
E
Oveland
Department of Biomedicine, Proteomics Unit (PROBE) at the University of Bergen, Norway. Electronic address: Anne.Doskeland@uib.no.
Anne
A
Døskeland
Department of Biomedicine, Proteomics Unit (PROBE) at the University of Bergen, Norway. Electronic address: Frode.Berven@uib.no.
Frode
F
Berven
Department of Biology, University of Bergen, Norway. Electronic address: Anders.Goksoyr@uib.no.
Anders
A
Goksøyr
Department of Biology, University of Bergen, Norway. Electronic address: Odd.Karlsen@uib.no.
Odd André
OA
Karlsen
D000818:Animals; D016000:Cluster Analysis; D029941:Fish Proteins / Q000378:metabolism; D048389:Gadus morhua / Q000235:genetics / Q000378:metabolism*; D063990:Gene Ontology; D050356:Lipid Metabolism / Q000187:drug effects*; D008099:Liver / Q000187:drug effects / Q000378:metabolism*; D053858:Metabolic Networks and Pathways / Q000187:drug effects*; D058977:Molecular Sequence Annotation; D011078:Polychlorinated Biphenyls / Q000633:toxicity*; D025341:Principal Component Analysis; D020543:Proteome / Q000378:metabolism; D040901:Proteomics / Q000379:methods*; D059467:Transcriptome / Q000235:genetics; D014280:Triglycerides / Q000097:blood
D029941:Fish Proteins; D020543:Proteome; D014280:Triglycerides; D011078:Polychlorinated Biphenyls; C014024:2,4,5,2',4',5'-hexachlorobiphenyl
Lipogenesis; Liver; Metabolism; PCB; Proteomics